AN95023 Application UBA1702/A Line Interrupter Driver Ringer Circ

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AN95023 Application UBA1702/A Line Interrupter Driver Ringer Circ

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Application UBA1702/A Line Interrupter Driver Ringer Circuit
AN95023
Application UBA1702/A Line Interrupter Driver Ringer Circuit
Application Note AN95023
Abstract
UBA1702/A performs high voltage interface ringer functions corded telephone sets. itself, typical behaviour combination this circuit with transmission member TEA106X family) microcontroller described detail. Information adjustments fulfil country requirements several application proposals given.
Philips Electronics N.V. 1997 rights reserved. Reproduction whole part prohibited without prior written consent copyright owner. information presented this document does form part quotation contract, believed accurate reliable changed without notice. liability will accepted publisher consequence use. Publication thereof does convey imply license under patent- other industrial intellectual property rights.
Application UBA1702/A Line Interrupter Driver Ringer Circuit
Application Note AN95023
Application UBA1702/A Line Interrupter Driver Ringer Circuit
AN95023
Author(s): Derks Product Concept Application Laboratory Eindhoven, Netherlands
Keywords High Voltage Line Interfacing System solution Interrupter Ringer DMOS
Date: November 1995
Application UBA1702/A Line Interrupter Driver Ringer Circuit
Summary
Application Note AN95023
This report intended provide application support designing telephone sets with UBA1702/A integrated circuit. contains worked-out examples application circuits. necessary operation principles adjustments have been included enable designer adapt basic circuit specific application. first chapter gives introduction elucidates some backgrounds circuit. Chapter gives blockdiagram pinning circuit. Chapter three contains detailed description specific blocks, together with possible adjustments performance separate blocks. Notes overall system performance found chapter four. consecutive steps meet specific country requirements described chapter five. Worked application examples UBA1702 well UBA1702A combination with various transmission circuits given chapter six. aspects discussed chapter seven. Chapter eight contains list with references. appendices contain: quick reference data TEA106X family (A), list abbreviations application diagrams printed pages size paper each (C).
Application UBA1702/A Line Interrupter Driver Ringer Circuit
CONTENTS
Application Note AN95023
INTRODUCTION BLOCKDIAGRAM Speech interface part Ringer part Supply BLOCKDESCRIPTION UBA1702/A Speech interface part 3.1.1 Switchdriver UBA1702 Principle operation Performance 3.1.2 Switchdriver UBA1702A Principle operation Performance 3.1.3 Line current management circuit Principle operation Adjustments performance 3.1.4 mute switch zener protection circuit Principle operation Adjustments performance Ringer part 3.2.1 Protection circuit Principle operation Performance 3.2.2 Frequency detector Principle operation Performance 3.2.3 Threshold comparator Principle operation Adjustment performance 3.2.4 Volume control Principle operation Performance 3.2.5 Melody input piezo driver Principle operation Performance Supply part Principle operation Performance DESCRIPTION COMPLETE SYSTEM FEATURING UBA1702/A 'Off hook' situation 4.1.1 Conversation mode Principle operation Performance 4.1.2 Pulse dial flash operation Principle operation Performance hook' situation
Application UBA1702/A Line Interrupter Driver Ringer Circuit
4.2.1
Application Note AN95023
4.2.2
Memory retention stand-by mode Principle operation Performance Ringer mode Principle operation Performance
APPLICATION GUIDELINE APPLICATION EXAMPLES ELECTROMAGNETIC COMPATIBILITY Printed circuit board TEA106X REFERENCES
APPENDIX TEA106X QUICK REFERENCE DATA APPENDIX LIST ABBREVIATIONS DEFINITIONS APPENDIX APPLICATION DIAGRAMS
Application UBA1702/A Line Interrupter Driver Ringer Circuit
LIST FIGURES
Application Note AN95023
Fig.1 System concept corded telephone. Fig.2 Blockdiagram Fig.3 Pinconfiguration Fig.4 Switchdriver UBA1702 Fig.5 Typical switching times UBA1702 combined with BSP254 Fig.6 Loopresistance function operation mode (basic set) Fig.7 Switchdriver UBA1702A Fig.8 Various transistor combinations replace single Fig.9 Typical switching times UBA1702A combination with MPSA92 Fig.10 Linecurrent management circuit Fig.11 Current detection threshold function RCDA Fig.12 Current limiting level function RCLA Fig.13 Mute switch zener protection Fig.14 voltage function RMSA (connection SPO) Fig.15 voltage function RMSA (connection VEE) Fig.16 Zenerprotection voltage function RZPA (connection SPO) Fig.17 Zenerprotection voltage function RZPA (connection VEE) Fig.18 Ringer protection limiting circuit Fig.19 Frequency detector. Fig.20 Switching thresholds frequency detector Fig.21 Response frequency detection circuit superimposed signals Fig.22 Threshold comparator Fig.23 Upper threshold level hysteresis function RRTA (connection RTA) Fig.24 Upper threshold level hysteresis function RRTA (connection VSS) Fig.25 Volume control Fig.26 Output level function volumesetting Fig.27 Melody input piezo driver Fig.28 Supply Fig.29 function Fig.30 Supply structures combination with TEA106X Fig.31 Supply voltage drop Fig.32 Pulse dialling waveforms with DMO. Fig.33 Ring input impedance function ringervoltage Fig.34 Ringer start Figure Basic application with TEA106X Figure Application UBA1702A with TEA1062 Figure Application UBA1702 with TEA1064B Figure Application UBA1702 with TEA1064B/1083(A)
Application UBA1702/A Line Interrupter Driver Ringer Circuit
Application Note AN95023
Application UBA1702/A Line Interrupter Driver Ringer Circuit
INTRODUCTION
Application Note AN95023
considerations which played important role during development UBA1702/A Line Interrupter Driver Ringer Circuit were following: circuit must complementary existing range transmission circuits (TEA106X/TEA111X family) microcontrollers (PCD33XX) such that these combination with UBA1702/A offer complete system solution. Therefore software controlled ringer concept supported. this concept ringermelody generated under control (microcontroller-)software. This flexible approach makes adaptation melody individual preference user possible. certain degree versatility must built meet requirements various countries. number required external (discrete) components must minimized. proposed system concept will illustrated with help figure
PIEZO BUZZER
SPEECH
LINE
INTERRUPTER/RINGER UBA1702 UBA1702A
TRANSMISSION CIRCUIT TEA106X TEA111X
SUPPLY
HANDSET
CONTROL SUPPLY CONTROL
MICROCONTROLLER PCD33XX
KEYBOARD
Xtal
Fig.1 System concept corded telephone.
different operation modes determined: ringer mode. This mode occurs during hook', quiescent condition. After applying ringer signal square wave with twice ringer signal frequency generated UBA1702/A. This square wave signal checked microcontroller correct frequency (frequency discrimination). case correct ringer frequency melody generated microcontroller which back UBA1702/A combination with specific output volume setting. After check correct amplitude ringer signal generated melody amplified UBA1702/A well desired level. piezo transducer makes melody audible. microcontroller supplied from telephone line UBA1702/A. conversation dialling mode. This mode related with 'off hook', dialling loop condition. this mode UBA1702/A serves overvoltage- overcurrent protection circuit transmission circuit. also contains line current detection circuit inform microcontroller about status line hookswitch. pulse dialling mode UBA1702/A takes care interrupting loop current during
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earpiece
microphone
Application UBA1702/A Line Interrupter Driver Ringer Circuit
Application Note AN95023
breakperiod proper resistance during make period. microcontroller supplied UBA1702/A directly from line indirectly supply point transmission circuit. meet specific market demands different versions developed: UBA1702, intended drive external PMOST interrupter UBA1702A which adapted drive external bipolar interrupter. UBA1702/A fabricated Philips' proprietary High Voltage Bipolar Complementary Double-diffused Metal Oxyde Semiconductor (HV-BCDMOS) process. circuit capable withstanding pins connected directly indirectly telephone line. detailed description this report given means blockdiagram UBA1702/A (ch. discussing details each block (ch. Notes overall system performance found application treated giving guidelines application also relation with specific requirements (ch. giving number worked-out examples including electronic hookswitch application (ch. aspects discussed (ch. list with references given (ch.8). appendices contain quick reference data TEA106X family (A), list abbreviations application diagrams UBA1702/A printed size paper (C). Note: addition UBA1702/A different circuits meant same time: UBA1702 well UBA1702A.
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SUPPLY SPEECH RINGER PROTECTION RINGER FREQUENCY DETECTION SWITCH DRIVER
blockdiagram UBA1702/A depicted figure while configuration given figure with belonging table.
Philips Semiconductors
Application UBA1702/A Line Interrupter Driver Ringer Circuit
BLOCKDIAGRAM
Rref
LINE CURRENT MANAGEMENT
Sref
RINGER
RINGER THRESHOLD
Fig.2 Blockdiagram
REFERENCES
Rref
Rref Sref
Sref
SENSE
VOLUME CONTROL
RINGER MELODY INPUT
VDD/2
UBA1702, UBA1702A UBA1702T, UBA1702AT
MUTE SWITCH
ZENER PROTECTION
Converter
Analog
Digital
PIEZO DRIVER
Rref
Sref
Application Note AN95023
Application UBA1702/A Line Interrupter Driver Ringer Circuit
Application Note AN95023
Fig.3 Pinconfiguration
SYMBOL
DESCRIPTION Switch Driver Input. Switch Driver Output. connected. Dialling Pulse Input. Speech Part Input. Speech Part Output. Ground ref. transm. circuit. Mute Switch Input. Zener Protection Adjustment. Mute Switch Adjustment. Ringer Threshold Adjustment. Ringer Frequency Output. Ringer Volume; (LSB). Ringer Volume;
SYMBOL
DESCRIPTION Ringer Volume; (MSB). Ringer Melody Input. Ground ref. micro ringer. Microcontroller supply. Supply from transm. circuit. Ringer Output Ringer supply. Ringer Output Ringer Part Input. Current Detection Output. Current Limitation Adjustment. Current Detection Adjustment. connected. Electronic Hookswitch Input.
Application UBA1702/A Line Interrupter Driver Ringer Circuit
blockdiagram figure three main parts distinguished: speech interface part ringer part supply
Application Note AN95023
subparts blocks which correspond with these parts related pins shortly described below.
Speech interface part
This part subdivided into: switchdriver. This block controls pins external PMOST case UBA1702) external case UBA1702A) interrupter switch. making high interrupter switched off, which corresponds with line break. basic applications shorted, applying control signal interrupter switch used hookswitch. line current management. This block measures line current flowing through pins SPO. This line current information used purposes: protection: line current limited case over current. limiting value adjustable CLA. detection: minimum value detected determine line- hookswitch status. This minimum value adjustable CDA, status information (logic signal) available CDO. mute switch zener protection. This block influences voltage present following cases: overvoltage: protection transmission circuit voltage clamped value adjustable ZPA. operation: assure specific resistance during make period pulse dialling voltage clamped value (adjustable MSA) under control MSI. This function also designated Mute2.
Ringer part
This part includes: ringer protection. This block shows similarities with zener diode. limits ringer voltage present RPI. ringer frequency detection. ringer signal converted this block logic (square wave) signal with twice frequency. This signal available RFO. ringer threshold. ringer signal checked required minimum level this block. level adjustable means RTA. volume control. control ringer output volume three control inputs: RV0, available. melody input piezo driver. ringer melody applied RMI. output stage enabled ringer threshold block voltage crosses certain threshold. piezo transducer connected between pins ROB.
Supply
stabilized voltage available supply microcontroller VDD. Input this supply ringer mode conversation dialling mode. ground reference speech ringer microcontroller.
Start-up circuit accomplished applying voltage greater than junction voltage (about EHI. basic application with mechanical hookswitch this voltage derived from telephone line: connected SDI. case interrupter switch also used Electronic Hook Switch (EHS) output microcontroller connected EHI. This high voltage capability (400 Vpeak). same holds SDO. blockdiagram switchdriver with external components given figure
Principle operation
3.1.1
speech interface part consists switchdriver (ch. 3.1.1), line current management (ch. 3.1.2) zener protection mute switch (ch. 3.1.3).
values graphs given this chapter typical room temperature unless otherwise stated.
This chapter describes detail three main parts speechpart (ch. 3.1), ringer part (ch. 3.2) supply (ch. 3.3). each part operation principle described adjustments performance discussed.
Philips Semiconductors
Application UBA1702/A Line Interrupter Driver Ringer Circuit
FROM SPEECHBRIDGE
BLOCKDESCRIPTION UBA1702/A
Speech interface part
Switchdriver UBA1702
BBBBBBBB BBBBBBBB BBBBBBBB BBBBBBBB BBBBBBBB BBBBBBBB
BSP254
BBBBBBBBBBBBBBBBBBBBBBBBBB BBBB BBBB BBBBBBBB BBBBB BBBBBBBBB BBBBBBB
DIAL PULSE FLASH
DRIVER
SWITCH
Fig.4 Switchdriver UBA1702
CURRENT LIMIT
CONTROL
SWITCH
Application Note AN95023
GROUNDREFERENCE CIRCUIT TRANSMISSIONGROUNDREFERENCE RINGER MICROCONTROLLER
Application UBA1702/A Line Interrupter Driver Ringer Circuit
Application Note AN95023
input voltage converted drive current which finally controls external PMOST creating voltage drop across making high drive current interrupted PMOST switched off. reference VSS, which different from transmission circuit (shifted reference), which VEE. This solution makes possible members TEA106X family: case TEA1064 peripherals (e.g. microcontroller) supplied between SLPE. peripheral connected SLPE UBA1702/A with TEA1064. other cases peripherals supplied between VEE. pins UBA1702/A have interconnected. PMOST switched voltage across which caused drive current. voltage limited internal zenerdiode current source, controlled signal (see 3.1.3), been added supply drive current during voltage operation. another way: high VDD) possible create linebreak making low, this only accomplished making high VDD). active state input been chosen such that same parity power down input transmission circuit, make high break (corresponds with power down). case very fast transients occur (e.g. lightning) series resistor (value source connection PMOST recommended.
Performance
performance switchdriver PMOST combination depends mainly characteristics PMOST: outputvoltage (reference VEE, low, voltage lower than Consequently almost entire voltage across transmission circuit available minimize ON-resistance PMOST maximize output swing transmission circuit. Delay switching times determined value drive current, capacitances voltages across PMOST. drive current about
Vdpi(V)
(LIN)
500.0m
-500.0m ILINE Vexch=48V Iline=20mA 22.5m 20.0m 15.0m 10.0m 5.0m
(LIN)
-250.0u
250.0u 500.0u
750.0u 1.0m
1.25m 1.5m (LIN)
1.75m 2.0m time(sec)
Fig.5 Typical switching times UBA1702 combined with BSP254
Application UBA1702/A Line Interrupter Driver Ringer Circuit
Application Note AN95023
20-30 voltage BSP254 PMOST used typical turn-off delay time switching-off time turn-on delay time switching-on time figure testcircuit basic application (see figure appendix) been used. clear that low, drive current generated current drawn from SDI. This important application while permanently connected line. Therefore during hook', while quiescent condition, insulation resistance greater than guaranteed. Insulation resistance always equal break resistance. Break resistance loop resistance during break period pulse dialling: basic application (interconnection between SDI) this resistance solely determined input resistance greater than voltage exceeds certain value (typical current through this remains constant therefore resistance increases. application (EHI driven from external source) break resistance equal insulation resistance difference between break insulation resistance elucidated means figure given resistance values indication only.
y1-axis without with
20.0M 10.0M min. isol. resis. 1.0M
(LOG) hook'
pulsedialling min. break. resistance 100.0k
10.0k
1.0k loop resistance make resistance 100.0 500.0 'Off hook'
1.0k 1.5k
2.0k 2.5k (LIN)
3.0k time (ms)
Fig.6 Loopresistance function operation mode (basic set)
3.1.2
Switchdriver UBA1702A
Principle operation
bipolar interrupter switch requires considerable base drive current, consequently figure replaced darlington resistor combination with Remaining circuitry been altered, figure small voltage difference between (one junction voltage) series resistance (R1) necessary limit basecurrent. value compromise:
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Advantages are:
clear that saturation required line current range important parameter external interrupter, necessary select this parameter.
alternative transistor make combination, figure Disadvantages transistor solution are:
Philips Semiconductors
Application UBA1702/A Line Interrupter Driver Ringer Circuit
possibility increase series resistance hence parallel resistance adding resistor times interrupter transistor remains saturated even high line currents.
increased number required components (four instead one) increased voltage drop across interrupter switch (one junction voltage extra).
value necessary sufficient base current keep bipolar transistor saturated high line currents. case non-saturation impedance voltage would increase considerably. this resistance connected parallel with deteriorate characteristics much high value necessary.
FROM SPEECHBRIDGE
DIAL PULSE FLASH
Coptional
Fig.8 Various transistor combinations replace single
DRIVER
SWITCH
100330k
MPSA92
MPSA92
Fig.7 Switchdriver UBA1702A
CURRENT LIMIT
2030k
CONTROL
SWITCH
100330k
MPSA92
2030k MPSA42
Application Note AN95023
GROUNDREFERENCE
CIRCUIT
TRANSMISSION-
GROUNDREFERENCE
RINGER
MICROCONTROLLER
MPSA92
Application UBA1702/A Line Interrupter Driver Ringer Circuit
Application Note AN95023
case very fast voltage transients occur (e.g. lightning) recommended connect capacitor Coptional parallel with be-resistor first configuration. This required second configuration.
Performance
Performance driver combination large extent dependent characteristics PNP. Because fact that this bipolar transistor current driven instead voltage driven like PMOST, delay times (turn-on: turn-off: shorter switching (on: off: faster, figure testcircuit basic application given figure been used.
Vdpi(V)
(LIN)
500.0m
-500.0m ILINE Vexch=48V Iline=20mA 20.0m 17.5m 12.5m 7.5m 2.5m
(LIN)
-2.5m -250.0u
250.0u 500.0u
750.0u 1.0m
1.25m 1.5m (LIN)
1.75m 2.0m time(sec)
Fig.9 Typical switching times UBA1702A combination with MPSA92
Insulation break resistance equal UBA1702.
3.1.3
Line current management circuit
Principle operation
blockdiagram depicted figure line current flowing through SPI, sense resistor (typical value SPO. voltage drop across resistor converted small sense current which used purposes: current detection (minimum level). this purpose sense current reconverted voltage compared reference voltage. voltage across greater than reference results logic output high VDD). current limitation (maximum level). Operation comparable line current detected. output comparator however used driving pin, directly controls switch driver. Reference voltages generated internal bandgap voltage source. Current detection intended microcontrollers give information about hookswitch- line status.
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RCDA
OPTIONAL
Both measures have influence current detection response time.
necessary possible decrease minimum level current detection current limiting even further connecting respective pins instead constant voltage means appropriate resistor.
Stability currentlimiter line currents (approx. improved connecting capacitor between VEE. However most cases this capacitor already present purposes.
Note that maximum current fixed approx. This achieved resistor series with CLA.
graph current limiting action given figure RCLA resistance between VEE.
current detection threshold current limit level adjusted connecting resistors respective pins CLA. voltages proportional line current. However, voltage limited which represents internal zener diode. influence RCDA (the resistance between VEE) given figure
Adjustments performance
Therefore connected with 'test (T1, CSI, hook) input microcontroller. case line current interruption microcontroller force transmission circuit into powerdown condition during which charge supply capacitors maintained. large line voltage swing also cause detection threshold passed. avoid unwanted powerdown measures taken:
Philips Semiconductors
Application UBA1702/A Line Interrupter Driver Ringer Circuit
apply sufficiently large time window software. This usually case. introduce delay connecting capacitor
FROM INTERRUPTER
SENSE
Fig.10 Linecurrent management circuit
Sref
LINE CURRENT MANAGEMENT
Sref
RCLA
SWITCHDRIVER CURRENT LIMIT
HOOK/LINE STATUS INPUT MICRO (GNDREF. TRANSM. CIRC.) TRANSMISSION CIRCUIT
Application Note AN95023
Application UBA1702/A Line Interrupter Driver Ringer Circuit
Application Note AN95023
120.0 Iline (mA) 100.0
(LIN)
80.0
60.0
40.0
20.0
6.0k 10.0k Value Rcda (Ohm) (LOG) 100.0k 1.0M
Fig.11 Current detection threshold function RCDA
120.0 Iline (mA) 110.0
(LIN)
100.0
90.0
80.0
70.0
60.0
50.0
40.0 100.0 1.0k Value Rcla (Ohm) 10.0k 100.0k (LOG) 1.0M
Fig.12 Current limiting level function RCLA
DMO-mode (MSI high). This mode guarantees decreased loop resistance during make period pulse dialling. Therefore logic control signal generated microcontroller, which applied MSI. buffer been added convert logic levels appropriate values. case high input level voltage compared with reference dependent difference more less current flows through shunt transistor. voltage adjusted connecting resistor between pins SPO. provision been made proper operation switch driver even voltage drops value voltage operation. Remarks: achieve voltages RMSA between SPO) required that therefore does drop below certain minimum value (about differential resistance shunt voltage (1.6 increased from control voltage exceed VDD. recommended increase voltage values greater than
This part UBA1702/A controls maximum voltage SPO. Dependent level different modes exist, these modes mutual exclusive:
blockdiagram given figure
Principle operation
3.1.4
Philips Semiconductors
Application UBA1702/A Line Interrupter Driver Ringer Circuit
protection mode (MSI low). This default operation mode which intended protect transmissioncircuit against overvoltage. operation principle similar mode, with this exception that different voltagedivider comparator been used. zener voltage chosen between three values: connecting SPO, leaving open. Intermediate values realized replacing shorts resistor.
BBBBB
Rref Sref MUTE SWITCH
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RMSA RMSA
OPTIONAL
CONTROL
mute switch zener protection circuit
RZPA
RZPA
Fig.13 Mute switch zener protection
ZENER PROTECTION
FROM CURR. MAN.
TRANSMISSION CIRCUIT
Application Note AN95023
Application UBA1702/A Line Interrupter Driver Ringer Circuit
Adjustments performance
Application Note AN95023
influence resistor RMSA between pins depicted figure RZPA between pins figure
Voltage between
(LIN)
300.0k 1.0M Value Rmsa (Ohm) (LOG)
9.0M
Fig.14 voltage function RMSA (connection SPO)
Voltage between
(LIN)
100.0k 1.0M Value Rmsa (Ohm) (LOG)
9.0M
Fig.15 voltage function RMSA (connection VEE)
Application UBA1702/A Line Interrupter Driver Ringer Circuit
Application Note AN95023
12.0 Voltage between 11.5
(LIN)
11.0
10.5
10.0
10.0k 100.0k Value Rzpa (Ohm) (LOG) 1.0M 9.0M
Fig.16 Zenerprotection voltage function RZPA (connection SPO)
18.0 Voltage between 17.0
(LIN)
16.0
15.0
14.0
13.0
12.0 10.0k 100.0k Value Rzpa (Ohm) (LOG) 1.0M 9.0M
Fig.17 Zenerprotection voltage function RZPA (connection VEE)
Note that minimum maximum zener protection voltages (respectively have finite values. This accomplished resistor series with ZPA. this minimum maximum voltage settings require external components have reasonable accuracy. This accuracy achieved with external resistors because they match with chip resistors
provision been built avoid ringers connected parallel with ringer bridge which share same RC-network from making noise during pulse dialling, called anti-tinkling function. Condition that during dialling high level VDD) applied MSI. This signal causes switch across voltage divider close this input voltage across limited value insufficient ringers make noise (typ. voltage drop ringer bridge). case anti-tinkling function wanted function not, latter made inoperative connecting appropriate resistor between with such value that voltage zenerprotection mode mode equal, figure This necessary because speech zenerprotection inoperative during high. internal diode between pins functions:
This input circuit preceded ringer bridge, consisting series RC-combination four diodes rectify AC-ringer signal. capacitor blocks current determines combination with series resistor input impedance voltages higher than limiting voltage. network also current limiting function.
voltage between pins limited fixed level (typ. 20.4 comparator shunttransistor combination which represents electronic zener diode, figure
Principle operation
3.2.1
ringer part consists protection circuit (ch. 3.2.1), frequency detection (ch. 3.2.2), threshold comparator (ch. 3.2.3), volume control (ch. 3.2.4) melody input piezo driver (ch. 3.2.5).
Philips Semiconductors
Application UBA1702/A Line Interrupter Driver Ringer Circuit
voltage must return zero make frequency detection possible this diode only conducts input voltage above certain level. this high series input impedance speech signals created, which required application.
BBBB BBBBBBBBBB BBBBBBBBBBBBBBBBBBBBBBB BBBBBBBBBB BBBB BBBBB BBBBB BBBBB BBBBB BBBBB BBBBBBBBBBBBBBBBBBBBB
DMO/ ANTI TINKLING
switch
FROM RINGERBRIDGE
FROM RINGERBRIDGE
Ringer part
Protection circuit
Fig.18 Ringer protection limiting circuit
Rref
RINGER PROTECTION
Application Note AN95023
SUPPLY RINGER CIRCUITS
Cvrr 22uF
Application UBA1702/A Line Interrupter Driver Ringer Circuit
Performance
Application Note AN95023
voltage divider which determines limiting voltage external accessible this voltage therefore adjustable. ringer supply voltage smoothed buffercapacitor CVRR. recommended value this capacitor larger value will result longer ringer start-up time, while smaller value will cause increased ripple amplitude, especially ringersignal frequencies.
3.2.2
Frequency detector
Principle operation
This block consists comparator with hysteresis output buffer level shifting, figure
non-inverting input comparator connected VRR, dependent most recently passed threshold, figure full wave rectified ringer signal applied RPI. This signal must cross high threshold level before high output only returns output level threshold level crossed. selection these threshold levels rather arbitrary under restriction following conditions: levels must within amplitude range VRPI voltage difference between levels have large possible. high level level have been chosen. These voltages satisfy conditions already available. Advantage applied hysteresis insensitivity superimposed signals, this insensitivity required some countries. logical output (levels VDD) intended processing microcontroller. Therefore this must connected 'chip enable test zero' (CE/notT0, FDI, input microcontroller. Note: because ringer signal full wave rectified frequency signal twice frequency original ringer signal! speech mode CE/notT0 input high. Hence speechmode infosignal combined with ringer signal OR-gate.
switch
RING FREQ. CE/T0 INPUT MICRO
SPEECH MODE
RINGER FREQUENCY DETECTION
Fig.19 Frequency detector.
Application UBA1702/A Line Interrupter Driver Ringer Circuit
Application Note AN95023
Vrpi(V) Vrr(V) Vdd(V)
22.5 20.0 15.0 10.0
(LIN)
Vrfo(V)
(LIN)
-10.0m
10.0m 20.0m (LIN)
30.0m 40.0m time(sec)
Fig.20 Switching thresholds frequency detector
Performance
previous paragraph pointed that threshold levels (VRR VDD) ring frequency detector fixed. insensitivity superimposed signals circuit made visible figure VRMS, sinewave
Vrpi(V) Vrr(V) Vdd(V)
16.0 14.0 10.0 -2.0
(LIN)
Vrfo(V)
500.0m -500.0m
(LIN)
-10.0m
10.0m 20.0m (LIN)
30.0m 40.0m time(sec)
Fig.21 Response frequency detection circuit superimposed signals
Application UBA1702/A Line Interrupter Driver Ringer Circuit
Application Note AN95023
superimposed VRMS, ringer signal. Despite various single threshold crossings within period inputsignal interference superimposed signal found back outputsignal available RFO. Care must taken case capacitors connected between lineterminals ground (VEE). During zero crossings ringer signal these capacitors discharged completely which result crossing lower threshold hence generating ringer frequency signal. This solved connecting high ohmic resistor order hundred kilo Ohm) between VEE.
3.2.3
Threshold comparator
Principle operation
This block checks amplitude ringer signal. this signal required level this block enables input piezo output stage, figure
RRTA
RRTA
OPTIONAL
Fig.22 Threshold comparator
After applying ringer signal protection circuit (ch. 3.2.1) capacitor CVRR charged. voltage across capacitor divided resistor network compared with reference voltage. crosses adjustable threshold output comparator switched high level. hysteresis been built avoid faltering. case output stage enabled melody applied current consumption circuit will increase. Consequently will drop without hysteresis output stage would disabled. current consumption would decrease, would rise cycle would repeat itself.
Adjustment performance
threshold level adjusted connecting resistor RRTA between pins increase level) between decrease level). figure upper threshold level hysteresis function RRTA given. hysteresis independently adjustable correlated with threshold level: about upper threshold level. connected (default threshold values) UBA1702/A suitable German specification described 1TR2 2.4.3.1/2 (June 1990).
BBBBBBBBBBBBBBBBBBBBBBBBBB BBBBBBBBB
ENABLE PIEZO OUTPUT STAGE
Rref
BBBBBBBBBBBB BBBBBBBBBBBB BBBBBBBBBBBB BBBBBBBBBBBB BBBBBBBBBBBB BBBBBBBBBBBB BBBBBBBBBBBB BBBBBBBBBBBB BBBBBBBBBBBB BBBBBBBBBBBB BBBBBBBBBBBB BBBBBBBBBBBB BBBBBBBBBBBB BBBBBBBBBBBB
THRESHOLD COMPARATOR
Application UBA1702/A Line Interrupter Driver Ringer Circuit
Application Note AN95023
(LIN)
y1-axis voltage between VRR-VSS y2-axis hysterese
10.0
(LIN)
9.75
5.75
9.25
5.25
8.75
4.75
8.25 Remark: below Rrta MOhm hysteresis 2.0M Value Rrta (Ohm) (LOG) 9.0M value
4.25
Fig.23 Upper threshold level hysteresis function RRTA (connection VRR)
y1-axis voltage between VRR-VSS y2-axis hysterese
20.0 19.0 18.0 17.0 16.0 15.0 14.0 13.0 12.0 11.0
(LIN)
(LIN) 15.0 14.0 13.0 12.0 11.0 10.0
200.0k 1.0M Value Rrta (Ohm) (LOG)
10.0M value
Fig.24 Upper threshold level hysteresis function RRTA (connection VSS)
Application UBA1702/A Line Interrupter Driver Ringer Circuit
3.2.4 Volume control
Application Note AN95023
Principle operation
CONTROL
CONTROL
CONTROL
Volume control implemented rather straightforward with D/A-converter, three inputbuffers outputbuffer, figure three logic inputs (least significant bit), (most significant bit) provided with pull-down current sources, which sink about case floating (high microcontrolleroutputs connected RV0-2 (for instance during start-up) these sources assure minimum volume setting. output three bits D/Aconverter controlcurrent which converted voltage with reference resistor limited zenerdiode This voltage buffered determines positive peaklevel piezo output signal. negative peaklevel fixed close VDD. Note: voltage pins RV0, exceed VDD.
Performance
Output voltage across minimum volume setting (bits RV2-0 low) mVpp. This level independent ringersupply conditions. following steps (RV2-0 (0,0,1) (1,1,0)) each step doubles output voltage steps). last level (RV2-0 (1,1,0)) times first level therefore 0.15 Vpp, condition that ringersupply voltage suffices. last step largest consequently positive peaklevel piezo output signal almost equal supply voltage VRR. However protect piezo element output amplitude internally limited internal zenerdiode about (unloaded). level outputsignal (available between pins ROB) function volume setting given figure
3.2.5
Melody input piezo driver
Principle operation
This (sub)block amplifies ringermelody generated microcontroller desired level piezo. contains input comparator, AND-gate, inverter outputbuffers operation, figure
BBBBBBBBBBB BBBBBBBBBBB BBBBBBBBBBB BBBBBBBBBBB
Irv0
Digital
PIEZO OUTPUT STAGE
Irv1
Analog
Converter
Irv2
VOLUME CONTROL
Fig.25 Volume control
input comparator threshold VDD. possible apply square wave signals (min. max. level VDD) well sinewave signals superimposed level VDD. However DTMF output used (sinewave signals) advised series capacitor avoid problems caused shift result e.g. resistor mismatch. small hysteresis about been built schmitt-trigger action assure jitterfree operation. This hysteresis influence duty cycle Because high inputimpedance input order hundred kilo Ohm) attenuation DTMF signals low: less than 0.05 square wave output comparator combined AND-gate with output ring threshold comparator (ch. 3.2.3). reached required level ring melody routed output buffers. These buffers switch their outputs (ROA ROB) between level coming from volume control VDD. resulting signal squarewave which applied piezo. slew rate outputs rather high
RINGER MELODY INPUT VDD/2 FROM THRESHOLD COMPARATOR
Philips Semiconductors
Application UBA1702/A Line Interrupter Driver Ringer Circuit
RINGER MELODY
Vrms,
Outputvoltage
ROA-ROB (Vpp)
load
y1-axis
100.0m
10nF
10.0
30.0
(LOG)
Fig.26 Output level function volumesetting
Ringervolumebits RV2,RV1,RV0
Fig.27 Melody input piezo driver
PIEZO DRIVER
(LIN)
FROM VOLUME CONTROL
volumestep
Application Note AN95023
PIEZO BUZZER
BBBB BBBB BBBBBBBBBBBBB BBBBBBBBBBBBB BBBBBBBBBBBBB BBBBBBBBBBBB BBBBBBBBBBBBB BBBBBBBBBBBBB BBBBBB
Operation different speech ringer mode:
reference block generates bias currents reference voltages reference voltages derived from bandgaps converted biascurrents internal resistors. supply split series shunt regulator, figure
Principle operation
already mentioned that piezo shows capacitive behaviour, outputcurrent reaches peak value during switching. Current capability important specification parameter sound pressure: limiting current level occurs there will less harmonics produced sound will dull. UBA1702/A deliver more than piezo transducers with capacitance least used. stead piezo transducer high ohmic loudspeaker used make ringer melody audible. capacitor range must connected series.
Performance
outputsignal contains therefore higher harmonics which contribute considerably produced sound-pressure. Because piezo shows equivalence with capacitor there flows current through therefore output stage operate Single Ended Load (SEL) configuration with piezo connected between VDD.
Philips Semiconductors
Application UBA1702/A Line Interrupter Driver Ringer Circuit
speech mode. supply powered transmission circuit. internal diode between avoids current flowing ringcapacitor CVRR other ringer parts. There current flowing through ringer output stage, consequently current flows through series regulator. stabilized comparing with reference voltage feeding errorsignal back regulator. ringer mode. ringer mode supply point VRR. avoid current flowing through transmission circuit external seriesdiode added. minimize voltage drop (important case line currents) recommended schottky type (e.g. BAT85).
Supply part
REFERENCES
Rref
Sref
PIEZO OUTPUT STAGE
SUPPLY
Fig.28 Supply
REGULATOR
REGULATOR
SERIES
SHUNT
BAT85
Dvbb
Cvbb 220uF
Cvdd 22uF
Application Note AN95023
FROM TRANSM. CIRC.
SUPPLY MICRO
Application UBA1702/A Line Interrupter Driver Ringer Circuit
Application Note AN95023
Current delivered series regulator well piezo outputstage which connected parallel. likely that high output volume output stage consumes (sources) more current than microcontroller sinks from VDD. consequence would increase. keep constant shunt regulator been added sink superfluous current. This series concept (outputstage microcontroller supply series) been chosen because advantages case ringer power conditions: ring current used more efficiently. also used supply some internal blocks.
Performance
output supply fixed stabilized voltage. Advantage rather supply voltage decrease current consumption microcontroller. This attractive during line current interruptions. output voltage smoothed CVDD. Besides smoothing function this capacitor also essential stability supply. recommended value larger value will result increased start-up times speech ringer mode. supplying microcontroller during long line interruptions advised choose larger value CVBB. quiescent condition (supply point voltages low) internal current consumption from minimized. With this provision memory retention microcontroller possible with resistor connected front hook switch line (trickle current), figure Because rather current consumption microcontrollers source capability supply accordingly low: max. currentsink capability (necessary ringer mode high volume settings) much higher. voltage drop between values minimized (100 make operation with line currents possible. output voltage function values given figure positive case sources current negative current sinked.
y1-axis Vdd@Vbb=2.5 Vdd@Vbb=3.0 Vdd@Vbb=3.5 Vdd@Vbb=3.5sink (ringer mode)
(LIN)
250.0u 500.0u 750.0u 1.0m 1.25m (LIN) 1.5m 1.75m |Idd| 2.0m
Fig.29 function
Application UBA1702/A Line Interrupter Driver Ringer Circuit
Application Note AN95023
DESCRIPTION COMPLETE SYSTEM FEATURING UBA1702/A
Apart from UBA1702/A transmission circuit microcontroller (dialler ringer) required form (basic) telephone set. Typical parameters solely dependent individual circuit characteristics also their interaction. This interaction will described this chapter with help typical application diagram which given appendix, figure different modes distinguished: 'off hook' situation (ch. 4.1) hook' situation (ch. 4.2).
'Off hook' situation
this mode conversation mode (ch. 4.1.1) pulse dial flash operation (ch. 4.1.2) distinguished.
4.1.1
Conversation mode
Principle operation (See also appendix figure
Start-up accomplished putting hookswitch upwards position. ringer series RC-network shortcircuited. current through switch Crng limited Rrng. line current starts flowing after voltage crossed threshold value interrupter starts conducting under condition that low. soon line current larger than (default) microcontroller receives chip enable (CE). Because electronic coil function transmission circuit takes some time before line current reached endvalue. meantime voltage across transmission circuit (and set) limited electronic zener UBA1702/A through which most line current flowing. charged transmission circuit supplied VCC, starts operating takes over current from zener. Dependent used transmission circuit there ways feed supply point UBA1702/A: ground reference VEE. This case transmissioncircuits except TEA1064A. UBA1702/A interconnected supplypoint transmission circuit VCC. series diode necessary separate ringersupply from speech part. Because rather large series resistance supply current capability small, sufficient UBA1702/A combination with microcontroller. ground reference SLPE. This structure possible transmissioncircuit powerdown mute input which referenced SLPE: TEA1064A TEA1064B. UBA1702/A connected SLPE with VEE. this case supply point directly line with (small) series resistor. reference this supply point (SLPE), this resistor influence impedance, [Ref. This results better supply capability. bridge large supply interruptions value CVBB increased. This almost influence start-up time transmission circuit.
TEA106X
TEA1064
SUPPLY STRUCTURE TEA106X (EXCEPT 1064A)
Dvbb
SUPPLY STRUCTURE TEA1064 WITH ADDITIONAL BACK-UP
TEA106X UBA1702/A
Dvbb
Rvcc
TEA1064
UBA1702/A
BAT85 100uF
BAT85
Cvbb 470uF
100uF
SLPE TEA1064
Fig.30 Supply structures combination with TEA106X
Application UBA1702/A Line Interrupter Driver Ringer Circuit
Application Note AN95023
After supplying UBA1702/A VBB, CVDD charged, rises when reset reference voltage microcontroller been reached start-up accomplished under condition CE/notT0 input high. This CE/notT0 (FDI,RF) input microcontroller functions: chip enable input used initialize system combination with test1 input microcontroller determines operation mode (speech, ringer stand by). ringer frequency discriminator input time between low-to-high transients (reciprocal ringerfrequency) measured, table. TABLE Operation modes microcontroller CE/notT0 standby CE/notT0 wave ringer CE/notT0 standby speech
longer than reset delay time
Performance
conversation mode UBA1702/A peripheral components slight influence characteristics. This influence caused (small) current consumption (large) parallel impedance UBA1702/A. However, case UBA1702A with single bipolar interrupter applied parallel resistance considerably low, also 3.1.2. influenced characteristics are: Balance Return Loss. figure that gives accuracy impedance approximates nominal impedance required local PTT. Because high parallel impedance UBA1702 deterioration almost negligible with respect situation without UBA1702. UBA1702A effect considerable because baseresistor value. certain extent effect compensated increasing value although supply capability (voltage drop) deteriorated. same holds transmit receive gain. Sidetone Suppression. certain amount attenuation (suppression) transmitted signal earpiece required. parallel impedance UBA1702 only minor effect anti sidetone network. case UBA1702A sidetone suppression will worse. Maximum Sending Level. Sending level limited voltage current. Maximum voltage swing determined voltage difference between SLPE transmission circuit. UBA1702A influence this parameter, case UBA1702 minimum peak limited threshold voltage applied PMOST (for BSP254 vary between capacitor between source gate give improvement (bootstrapping), though switching times getting worse. Limitation current occurs there enough current available modulated outputstage transmissioncircuit. Because current consumption influence negligible. Automatic Gain Control. provision present compensate transmit receive gain long line lengths. This gain control determined line current flowing through transmission circuit. Current consumption UBA1702/A (UBA1702: typ. UBA1702A: typ. interrupter base current excluded) reduces this current, which results very small gain increase relevant range. really necessary this gain increase compensated decreasing value Voltage Parallel Operation. case supply conditions e.g. operation with long lines with classical (impedance about connected parallel available supplyvoltage insufficient proper operation transmission circuit microcontroller. influence UBA1702/A small, figure
Application UBA1702/A Line Interrupter Driver Ringer Circuit
Application Note AN95023
Iline UBA1702 UBA1702A
(typ)
Rvcc
1064
0.25 (typ)
Dvbb
0.12 (typ)
INTERRUPTER (typ) BAS11 BAS11
BAT85
SUPPLY UBA1702
LINE+
BAS11 BAS11 (typ)
TEA106X
SLPE
Iline
1064
LINE-
Fig.31 Supply voltage drop
4.1.2
Pulse dial flash operation
Principle operation
dial- flash pulses generated microcontroller under control keyboard. Interrupting line current consequences supply several measures taken guarantee noninterrupted supply microcontroller. kind measure depends type transmission circuit used. Circuits without power down function (e.g. TEA1062/A). During breakperiod pulse dialling eventually flash operation there still flowing current because electronic coil function. (Creg) discharged drops unacceptable level supply consequently microcontroller. Increasing value recommendable because discharge current requires unrealistic capacitance values. Workable alternatives following solutions: Solution requires additional series drop diode (Schottky e.g. BAT85) capacitor connected between diodes VEE. Disadvantage additional voltage drop caused diode. Solution comprises only increase value CVDD. Disadvantage increase microcontroller startup time. Circuits with power down logic reference (most circuits TEA106X family). Because power down function current consumption reduced almost factor increasing value could alternative increase CVDD. Note that power down function used external generated interrupts (e.g. switching connected PABX) well. output UBA1702/A controls power down mode transmission circuit microcontroller. Restriction that power down control pulse dial flash output combined. Circuits with power down SLPE logic reference (e.g. TEA1064A TEA1064B). CVBB (see fig. chosen accordance with required interruption time.
BBBBBBBBBBBBBB BBBBBBBBBBBBBB BBBBBBBBBBBBBB BBBBBBBBBBBBBB BBBBBBBBBBBBBB BBBBBBBBBBBBBB BBBBBBBBBBBBBB
MICRO CONTROLLER
BBBB
BBBBBBBBBBBBBB BBBBBBBBBBBBBB BBBBBBBBBBBBBB BBBBBBBBBBBBBB BBBBBBBBBBBBBB BBBBBBBBBBBBBB BBBBBBBBBBBBBB
(typ)
Application UBA1702/A Line Interrupter Driver Ringer Circuit
Performance
Application Note AN95023
pulse dialling waveform mainly determined transmission circuit used. case (Creg) discharged during break period pulse dialling missing power down mode because resistor between SLPE, takes some time before charged again line current voltage across reached steady state. Considerable pulse distortion occurs. stead using increase voltage between SLPE silicon diodes series with used, however practice exchange feeding bridge highly inductive this case inductors determine current waveform. used voltage during pulsing period determined UBA1702/A transmission circuit. Pulse distortion occurs until transmission circuit taken over line current after input (MSI) become low, hence post-pulsing period. Dialling waveforms depicted figure
Vdpi(V)
-500.0m
(LIN)
Vmsi(V)
-500.0m
(LIN)
Vbridge(V) Iline=20mA
14.0 10.0
(LIN)
TEA106X-Vspo UBA1702/A-
-200.0m
200.0m 400.0m
600.0m 800.0m (LIN) time(sec)
Fig.32 Pulse dialling waveforms with DMO.
hook' situation
this mode resistance must very high. After applying voltage enter ringer mode (ch. 4.2.2), otherwise memory retention stand-by mode (ch. 4.2.1) maintained.
4.2.1
Memory retention stand-by mode
Principle operation
some countries allows subscriber draw very small current order from line e.g. memory retention. this purpose microcontroller stand-by mode which entered making CE/notT0 input zero longer time interval. this mode supply voltage allowed drop value current likewise decreased very value (about PCD3349). UBA1702/A stand-by mode too, entered under condition that voltages supply points low. this mode current sink from supply point minimized disconnecting some internal circuit parts.
Application UBA1702/A Line Interrupter Driver Ringer Circuit
Application Note AN95023
hook' situation line current blocked ringer capacitor Crng interrupter. These have bridged high ohmic resistors (for most countries total minimum resistance required) direct supply from line. case electronic hookswitch (the interrupter incorporate hookswitch function well) also possible achieve start from this mode. this purpose keyboard matrix used. depressing this same time making CE/notT0 input high microcontroller enter conversation dialling mode force interrupter conducting state. application proposal given which this function been worked further.
Performance
stand-by mode UBA1702/A resistance between more than trickle current more than remains microcontroller. clear that after connecting with discharged capacitor will take some time before this stand-by mode operational. This caused large time constant.
4.2.2
Ringer mode
functions required ringer operation have been partitioned between UBA1702/A microcontroller: TABLE Function partitioning between UBA1702/A microcontroller ringer mode UBA1702/A Line termination ringer signal Overvoltage protection Supply Superimposed signal discrimination Ringer signal amplitude check Volume controlled piezo output stage Note: ringer signal: frequency signal generated exchange ringer melody: audio frequency melody (warble) generated microcontroller made audible piezotransducer. microcontroller ringer signal frequency check ringer melody generation volume control
Principle operation
concise description operation principle software controlled ringer concept already been given introduction: ringer signal rectified necessary limited used supply. square wave with twice frequency ringer signal generated available RFO. Frequency check done microcontroller which measures time interval between high transients. most cases required frequency interval internal bits versions with EEPROM diode option with versions without EEEPROM. measured time interval according setting melody generated. After voltage (below limiting voltage proportional ringer voltage) crossed minimum threshold melody routed piezo output stage. This amplitude check. Advantage applying result amplitude check this point instead gating ringer frequency output gain start time: charging capacitor done parallel with frequency check. This particularly advantageous when ringer signal amplitude frequency. ringer melody amplified level according volume setting. only volume control bits available recommended interconnect least significant bits (RV0 RV1) UBA1702/A. steps larger instead with exception last levels still equidistant.
Application UBA1702/A Line Interrupter Driver Ringer Circuit
Performance
Application Note AN95023
Ring input impedance. input impedance dependent ringer signal amplitude value series RC-network (Rrng Crng). Because limiting function also linear. Above certain amplitude impedance only influenced network. Decreasing resistance increasing capacitance increase output power then little because most additional available power dissipated limiting protection circuit. Minimum ringimpedance most cases fixed local requirements. curve typical application (figure given figure
y1-axis 45Vrms 60Vrms 75Vrms 90Vrms Vrms/Irms
10.0k
(LIN)
8.0k
6.0k
4.0k
2.0k 20.0 30.0 40.0 50.0 60.0 70.0 Ring frequency (Hz) (LIN) 80.0 90.0 ring 100.0
Fig.33 Ring input impedance function ringervoltage
Impedance defined value ringer voltage across line terminals divided value ringer current. impedance speech signals Vrms) larger than Start time. Ringer start time defined time between applying ringer signal moment melody audible. This time been minimized paralleling supply capacitor charge frequency check determined various parameters like capacitance values CVRR CVDD, frequency amplitude ringer signal, reset level microcontroller number required high transients frequency check. typical application with ringer signal Vrms this time about figure frequency check only carried after microcontroller been reset. case this reset generated externally means RC-network time constant this network adds total start time. Between ringer bursts drop below reset level because current consumption UBA1702/A. every burst start-up delay will occur. However, external reset necessary under condition that XTAL minimum operating voltagelevel (for fXTAL 3.579545 this voltagelevel available before clock generated this XTAL applied. This condition generally fulfilled with quartz resonators since oscillator start-up takes several milliseconds.
Application UBA1702/A Line Interrupter Driver Ringer Circuit
Application Note AN95023
Vrpi(V)
25.0 10.0 -5.0
(LIN)
Vrr(V)
20.0 10.0
(LIN)
Vrfo(V)
(LIN)
Vro'(V)
(LIN)
-8.0 -100.0m
100.0m 200.0m
300.0m 400.0m (LIN) TIME
Fig.34 Ringer start
Output sound pressure. output sound pressure dependent available output voltage, applied piezo transducer acoustical properties cabinet. output voltage UBA1702/A limited Vpp, value most piezo's handle without degradation. frequency characteristic piezo very irregular: output levels within specified frequency range vary
Application UBA1702/A Line Interrupter Driver Ringer Circuit
APPLICATION GUIDELINE
Application Note AN95023
this chapter procedure making basic application with transmission circuit TEA106X-family UBA1702/A will given. means figure (basic application, appendix) design flow given number consecutive steps which should taken. possible every step also components involved their influence every step given, preferred value given between brackets: [.]. UBA1702/A also reference relevant graph chapter made. adjustment resistors, RZPA RRTA, connected different ways, only given application diagram. more information settings TEA106X datahandbook (IC03), appendix [Ref. 4-6]. basic application given figure comprises TEA106X transmission circuit, PCD3349A microcontroller UBA1702/A. seen only components have fixed value. These components setting reference current transmission circuit various components, which indicated diagram.
STEP Conversation mode HOOK CONDITION
ADJUSTMENT
1.1.1 settings. First adjust settings UBA1702/A TEA106X local requirements maximum ratings transmission circuit. Voltage limit between Line current limit Line current detection sensitivity Voltage between SLPE slope Supply point Artificial inductor Reset time microcontroller Supply point RZPA [open], fig. 16/17 RCLA [short VEE], fig. RCDA [open], fig. silicon diodes series with [20], combination with RonT1+RSPI-SPO [100 [4.7 Crst [open], Rrst [short] CVDD
1.1.2 Impedance sidetone. After setting setimpedance, sidetone optimized mean linelength linetype. Also chosen. impedance Sidetone (RonT1 RSPI-SPO series) R11,
1.1.3 TEA106X microphone earpiece amplifiers, also appendix After adjusting microphone sensitivity, gain frequency curve desired value. same holds piece. Sensitivity microphone Microphone gain pass R20, (TEA106X dependent), Rmic, Rmic-, Rmic+ (combination with
Application UBA1702/A Line Interrupter Driver Ringer Circuit
Stability High pass Earpiece gain pass Stability High pass Dialling mode
Application Note AN95023
(TEA1062 only) Rmic, (combination with inputimpedance) (TEA106X dependent) (combination with (combination with inputimpedance), (combination with earpiece impedance)
1.2.1 DTMF dialling DTMF attenuation High pass 1.2.2 Pulse dialling Make resistance used: used: RMSA [open], fig. 14/15 Rdtmf1, Rdtmf2 Cdtmf1, Cdtmf2 (combination with Rdtmf1, Rdtmf2 impedance DTMF input)
STEP HOOK CONDITION
ADJUSTMENT
Ringer mode. First select value Crng (often certain value prescribed local requirements). Rrng will follow result minimum allowed impedance. input impedance Ring threshold sensitivity Start-up time Input coupling block) Rrng [2.2 Crng µF], fig. RRTA [open], fig. 23/24 CVRR µF], Crst [open], Rrst [short] CRMI
Standby mode. This mode optional required microcontroller EEPROM memory retention necessary. Standby current Rsb1 series with Rsb2
Application UBA1702/A Line Interrupter Driver Ringer Circuit
APPLICATION EXAMPLES
Application Note AN95023
follow preceding guideline some practical examples applications with UBA1702/A given this chapter. proposed examples include functions required complete functional like ringer, interrupter, wire conversion, protection etc. Therefore PCD3349A/53A single chip 8-bit telecom microcontrollers used which programmed multistandard repertory dialler/ringer: PCD3332-2 PCD3330-1, [Ref. [Ref. Figure gives basic application which already been discussed chapter Pulse DTMF dialling selected means switch (diode option). Because power down function present, flash operation critical: supply microcontroller (VDD) drop below reset level during flash microcontroller will reset itself. same holds operation: setvoltage during make period 'survive' break period. Figure more less extension figure which guideline followed. Instead PMOST interrupter bipolar transistor (MPSA92) used. settings: Voltage limit VEE: Line current limit: Line current detection sensitivity: Voltage SLPE: slope: On-hook loopresistance: settings: Voltage gain mic.: Voltage gain DTMF: Transmit cut-off frequency: Voltage gain Receive cut-off frequency: startvalue: stopvalue (gain dB): Ringer: Ring threshold sensitivity: Ringer melody high pass cut-off:
line currents).
25.5 23.4 kHz. 15.9 kHz.
10.5
Figure depicts application with TEA1064B PCD3353A microcontroller. latter contains EEPROM. This kind memory makes number storage without need trickle current (flowing through resistors Rsb1 Rsb2 fig. possible. TEA1064B features power down function, selectable reference logical inputs dynamic limiter. This dynamic limiter combined with mic.mute (switch Smmute). reference input (VEE2) this application connected SLPE. This results combination with RVBB CVBB improved supply capabilities. measures extended addition C32. RRPI then required correct ringer detection. Compared previous example following settings have been changed: settings: Voltage between SLPE:
Application UBA1702/A Line Interrupter Driver Ringer Circuit
slope: hook loop resistance: settings: start value: stop value (gain dB):
Application Note AN95023
last proposal given figure features on-hook dialling call progress monitoring (TEA1083A). on-hook dialling facility requires separate ringerbridge (D7-10) capacitively coupled Crng1 Crng2. capacitors needed because common reference ringer speech part: VEE. voltage across both capacitors always same polarity therefore capacitors unipolar. Going off-hook done ways: closing cradle switch (corresponds with picking handset). UBA1702 connected line Rehs starts conducting. microcontroller informed whether cradle been operated hookinput. Going on-hook achieved opening cradle switch. Consequently hookinput micro pulled down Rhook1. operation pushbutton 'HOOK'. Start comparable previous case, however takeover signal necessary keep high. This signal generated microcontroller available (LoudSpeaker Enable). same time Thook conducts simulate switch matrix. case handset lifted (cradle switch closed) hook push button used switch amplifier off. diode (D14) been added protect microcontroller input overvoltage. TEA1083A supplied from line, therefore line current split constant part flowing through (about line current dependent part flowing through TEA1083A SLPE. output volume adjusted means R22. save microcontroller ringer volumebits combined. stepsize doubled consequence there levels instead
Application UBA1702/A Line Interrupter Driver Ringer Circuit
ELECTROMAGNETIC COMPATIBILITY
Application Note AN95023
With respect electromagnetic compatibility (EMC) common European international specification exists. Also measurement methods differ always reproducible. application laboratory Eindhoven (PCALE) German current injection method used (VDE 0878 part 200). reliable method measuring highly reproducible. method described [Ref. hints TEA106X transmission circuit given second paragraph this chapter based this method. same counts hints printed circuit board design given first paragraph.
Printed circuit board
current injection method, radio frequency (RF) signal currents enter telephone wires leave capacitive coupling ground. Normally, telephone handset largest capacitance ground thus main part signal current flows ground handset. However, proper layout essential good EMC. first measure taken create groundplane PCB. signals entering should decoupled immediately this groundplane. Preferably this groundplane homogeneous into parts interconnection wires. reach this double layered PCB, with interconnection wires side board groundplane other side, minimum. When interconnection wires within groundplane inevitable, continuity groundplane should restored. This done cross coupling these interconnection wires jumpers wires interconnect side PCB. this signal currents flow freely over groundplane. Another measure keep length wires between different components short possible. course this measure especially important those wires which interconnect more signal sensitive parts, particular wire connected SLPE which also reference UBA1702/A. current, signal currents prefer flow ground lowest ohmic path. Therefore, should noted that wire corresponds inductor
TEA106X
this paragraph standard measures TEA106X given. When, after proposed measures taken, behaviour optimized, advised start with transmit direction telephoneset optimize receive part thereafter. This because, sidetone, signals demodulated transmit channel will seen receiver channel. text below supposed that printed circuit board which TEA106X-UBA1702/A built, provided with groundplane which connected VEE. preferred place components meant close possible pins, except when otherwise stated. more details performance TEA106X, [Ref. signals entering printed circuit board wires should decoupled groundplane capacitors, preferably placed close possible connection. Since these capacitors will parallel
Application UBA1702/A Line Interrupter Driver Ringer Circuit
Application Note AN95023
with impedance, their value limited. practice, total capacitance 10nF between wires applied without degrading balance return loss. Between wires groundplane capacitors placed, well series inductance series with diode bridge. signals entering inputs transmit channel (MIC+, MIC-) will demodulated amplified line. Because high gain order transmit channel very sensitive signals. Therefore, decoupling inputs essential. inputs MIC+ MIC- preferably decoupled capacitors connected groundplane. Also series resistors applied which combination with capacitors form pass filters towards inputs. Resistors advised case electret microphone) which reduce gain setting with less than half depending input impedance pins MIC+ MIC-. This compensated adapting transmit gain adjustment resistor TEA106X. case handset microphone connected TEA106X microphone inputs long cord, extra decoupling needed. This done adding capacitors each, placed between cord connection groundplane, preferably close possible cord connection. signals entering inputs receive channel (IR) will demodulated amplified earpiece therefore decoupling input essential. input TEA106X capacitor connected groundplane advised. case earpiece connected TEA106X long cord, extra decoupling needed. This done adding capacitors 10nF each, placed between cord connection groundplane, preferably close possible cord connection. prevent remaining signals from entering earpiece outputstage TEA106X pin, series resistor should applied create high ohmic path. value this resistor dependent type earpiece capsule used. When dynamic capsule used, resistors advised. This will reduce gain setting with 1.19 This compensated adapting receive gain adjustment resistor TEA106X. Besides these essential measures some additional measures taken. capacitor between GAS2 groundplane improve transmit direction. series combination resistor capacitor connected between STAB groundplane improve both transmit receive direction.
Application UBA1702/A Line Interrupter Driver Ringer Circuit
REFERENCES
Philips Semiconductors Data Handbook Semiconductors telecom systems IC03 Philips Semiconductors, 1995 [Ref. UBA1702/A Line Interrupter Driver Ringer Preliminary specification October 1995 [Ref.
Application Note AN95023
[Ref.
Measures meet requirements TEA1060-family speech transmission circuits Coenen Wortel PCALE reportnumber: ETT89016
Extended application information speech transmission circuits found [Ref. TEA1060 family versatile speech/transmission electronic telephone sets Designers' guide P.J.M. Sijbers July 1987, 12NC 939834110011 [Ref. Application versatile speech/transmission circuit TEA1064 full electronic telephone sets Dongen P.J.M. Sijbers PCALE reportnumber: ETT89009 [Ref. Application speech-transmission circuit TEA1062 P.T.J. Biermans PCALE reportnumber: ETT89008 More information dialler ringers found [Ref. PCD3330-1: multi-standard repertory dialler/ringer with EEPROM (programmed PCD3353A) Objective specification; July 1993 [Ref. PCD3332-2: multi-standard pulse/tone repertory dialler/ringer (programmed PCD3349A) Objective specification; March 1994
Application UBA1702/A Line Interrupter Driver Ringer Circuit
APPENDIX TEA106X QUICK REFERENCE DATA
Application Note AN95023
DC-CHARACTERISTICS (with slope resistance Member V(LN-VEE) V)at Iline 4.45 0.20 4.00 0.25 -0.45 3.50 0.25 3.90 0.25 4.45 0.25 V(LN-VEE) R(REG-LN) 3.80 0.25 -0.30 3.50 -3.40 0.30 3.80 0.30 V(LN-VEE) R(REG-SLPE) 0.30 0.35 0.30 0.35
TEA1060 TEA1062 TEA1064B TEA1067 TEA1068
SENDING GAIN Member Setting range TEA1060 TEA1062 TEA1064B TEA1067 TEA1068 Gain with
RECEIVE GAIN (from QR+) Setting range Gain with R4=100
SENDING NOISE Member Noise dBmp) with TEA1060 TEA1062 TEA1064B TEA1067 TEA1068 Noise dBmp) with sending gain
more data datahandbook [Ref.
Application UBA1702/A Line Interrupter Driver Ringer Circuit
APPENDIX LIST ABBREVIATIONS DEFINITIONS
CE/notT0
Application Note AN95023
Automatic Gain Control: line loss compensation TEA106X Balance Return Loss Chip enable test0 input microcontroller, used putting device active mode ringer frequency discriminator input Crng Ringer input capacitor Crst Capacitor generating external reset microcontroller Cradle Switch Input, Dial Mode Operation, provision guarantee resistance during make period pulse dialling, also designated Mute2 DTMF Dual Tone Multi Frequency (dialling system) Electronic Hook Switch (required on-hook dialling) Electro Magnetic Compatibility: collective noun susceptibility radiation circuit apparatus Frequency Discriminator Input, CE/notT0 Flash Timed break (DC) line current call transfer exchange HOOK Hook switch control input, Receive input TEA106X Positive line terminal TEA106X Microphone input MIC+, MIC- Microphone inputs pins TEA106X MOSFET Metal Oxide Field Effect Transistor Mute Mode which operational during dialling PCALE Product Concept Application Laboratory Eindhoven Printed Circuit Board Powerdown Reduced current consumption mode during pulse dialling flash operation Telephone administration QR-, Telephone earpiece output TEA106X Rcda Resistor setting line current detection sensitivity Rcla Resistor setting line current limit value Radio Frequencies Ringer Frequency input, CE/notT0 Rmic Resistor setting microphone sensitivity Rmsa Resistor setting mute (DMO) voltage Rrng Ringer input resistor Rrst Resistor generating external reset microcontroller Rrta Resistor setting ringer threshold Rsb1, Rsb2 Resistors stand-by (trickle) current memory retention Rzpa Resistor setting zener protection voltage SLPE slope TEA106X Test1 input microcontroller, used hook detection TEA106X TEA106X speech transmission family: TEA1060/61, TEA1062, TEA1063, TEA1064A, TEA104B, TEA1065, TEA1066, TEA1067, TEA1068 Supply TEA106X Ground reference TEA106X UBA1702/A Ground reference microcontroller logic reference UBA1702/A
Application UBA1702/A Line Interrupter Driver Ringer Circuit
APPENDIX APPLICATION DIAGRAMS
Application Note AN95023
Application UBA1702/A Line Interrupter Driver Ringer Circuit
Application Note AN95023
Rsb2
2322-186-16134
n.c.
Rcda Rcla
2322-186-16134
BSP254a Rrng
DP/FL
Rsb1
2322-186-16134
Crng
PN-solder_pin_1mm5
CRADLE
UBA1702
2322-186-16392
Rzpa
Rmsa Rrta
BUZZER
2322-186-16391
2222-035-64479
PN-solder_pin_1mm5
BAS11
Cvrr
2322-186-16392
Zbal
2222-035-64479
Cvdd
2222-370-11334
2322-186-16392 2322-186-16209
2222-370-21473
components marked with
Figure Basic application with TEA106X
BBBB BBBB BBBB
n.c.
BAT85
BBBB BBBB BBBB BBBB
2222-629-03103
*C38 10nF
Application UBA1702/A Line Interrupter Driver Ringer Circuit
Application Note AN95023
2322-186-16681
ROW2
Crmi ROW2 ROW3 ROW4 ROW5 DIODE MUTE EARTH ROW1
ROW1
ROW3
Cdtmf2
Rdtmf1
Cdtmf1
VOL1 TONE VOL2 VOL3 DP/FL COL1 COL2 COL3 COL4
ROW4 TONE ROW5
2322-186-16392 2222-035-68109
(OPTIONAL) RV2(MSB)
Rdtmf2 *C33
2222-629-03102
Crst
DIODE MUTE
MUTE
TONE
2322-186-16392
PCD3349A
XTAL1 XTAL2 RESET CE/FDI COL6 COL5
RV0(LSB) DP/FL COL1 COL2 COL3 COL4
TEA106X
3.58MHz
Rmic1
2222-631-70561
2222-631-10101
2322-186-16362
Rmic
MIC1
COL6
Rrst
2222-035-64479
*Rqr
2222-629-03102
Rmic+
COL5
*C35 *C38 2.2nF2.2nF
2322-186-16362
*C34 2.2nF
*C36
*C37
2322-186-16392
2.2nF 2.2nF
Earpiece
COL1
COL2
COL3
COL4
COL5
COL6
STORE
ROW1
TONE
ROW2
VOL+
ROW3
VOLM7
ROW4
FLASH PAUSE
ROW5
1N4148
DIODE
Pulse/Tone
Application UBA1702/A Line Interrupter Driver Ringer Circuit
Application Note AN95023
Rsb2
MPSA92
n.c.
130k 47nF
2322-186-16134
n.c.
BAT85
Rrng
DP/FL
Rsb1
2322-186-16134
Crng 0.82uF
PN-solder_pin_1mm5
CRADLE
UBA1702A
2322-186-16392
BR211-240 BAS11
PN-solder_pin_1mm5
Figure Application UBA1702A with TEA1062
BUZZER
Cvrr
2222-035-64479
22uF
2322-186-16392
Zbal
2222-035-64479
Cvdd 47uF
220nF
2322-186-16392
2322-186-16209
20*C38 10nF
2222-629-03103
components marked with
Application UBA1702/A Line Interrupter Driver Ringer Circuit
Application Note AN95023
2322-186-16681
ROW2
Crmi
ROW2 ROW3 ROW4 ROW5 DIODE MUTE
ROW1
ROW1
10nF Cdtmf2 100nF Rdtmf1 Cdtmf1
ROW3 ROW4
100uF
VOL1 TONE VOL2 VOL3 DP/FL COL1 COL2 COL3 COL4
100nF TONE
ROW5
110k
2322-186-16392 2222-035-68109
RV2(MSB)
4.7uF
*C33
2222-629-03102
Rdtmf2
DIODE MUTE
MUTE
TONE
PCD3349A EARTH
XTAL1 XTAL2 RESET CE/FDI COL6 COL5
2322-186-16392
RV0(LSB) DP/FL COL1 COL2 COL3 COL4
TEA1062
3.58MHz
2222-631-70561
Rmic220
2222-035-64479
2222-631-10101
100pF 100k 47uF *Rqr
2222-629-03102 2322-186-16362
22nF Rmic
MIC1
COL6 COL5
100pF
Rmic+ *C36 *C37
2322-186-16392
22nF *C35 *C38
2322-186-16362
*C34 2.2nF Earpiece
2.2nF2.2nF
2.2nF 2.2nF
COL1
COL2
COL3
COL4
COL5
COL6
STORE
ROW1
TONE
ROW2
VOL+
ROW3
VOLM7
ROW4
FLASH PAUSE
ROW5
1N4148
DIODE
Pulse/Tone
Application UBA1702/A Line Interrupter Driver Ringer Circuit
Application Note AN95023
2322-186-16134
2322-186-16392
BSP254a n.c. Rrng
DP/FL
Crng 0.82uF
PN-solder_pin_1mm5
*C31
CRADLE
BR211-240 *C32
PN-solder_pin_1mm5
BAS11
components marked with
Figure Application UBA1702 with TEA1064B
BBBB BBBB BBBB
n.c.
Rrpi 180k
BAT85 130k
2322-186-16134
47nF
UBA1702
2322-186-16392
BUZZER
Cvrr
2222-035-64479
22uF
2322-186-16392
Zbal
2222-035-64479
Cvdd 22uF
220nF
2322-186-16392
2322-186-16209
*C38 10nF
2222-629-03103
Application UBA1702/A Line Interrupter Driver Ringer Circuit
Application Note AN95023
2322-186-16681
Rvbb
2322-186-16134
COL1
Crmi
COL1 COL2 COL3 COL4 COL5 COL6
EARTH
10nF Cdtmf2 100nF Rdtmf1 Cdtmf1
COL2 COL3
RVOL2 RVOL1 RVOL3 TONE
(MSB) (LSB)
100uF
Cvbb
2222-035-64479
470uF
100nF TONE
COL4
120k
2322-186-16392 2222-035-68109
4.7uF
*C33
2222-629-03102
Rdtmf2
COL5 COL6
TONE
PULSE/DTMF SELECT
DP/FL MUTE
2322-186-16392
PCD3353A
SLPE
VEE2
MUTE
DTMF
VEE1
HOOK XTAL1 XTAL2 RESET CE/RF ROW1 ROW2
DP/FL PD/DTMF MUTE ROW6 ROW5 ROW4 ROW3
DP/FL
DLS/MMN
GAS1 GAS2
TEA1064B
QRQR+
MIC-
MIC+
STAB
3.58MHz
MUTE ROW6 ROW5 ROW4 ROW3
2222-631-70561
Rmic220
2222-035-64479
2222-631-10101
100pF 100k 47uF *Rqr
2322-186-16362
22nF Rmic
MIC1
ROW1 ROW2
100pF
Cdls
2222-629-03102
Smmute
2222-629-03102
Rmic+ *C36 *C37
2322-186-16392
*C34 2.2nF Earpiece
2322-186-16362
470nF *C35 *C38 Rdls 2.2nF2.2nF
22nF
2322-186-16362
2.2nF 2.2nF
COL1
COL2
COL3
COL4
COL5
COL6
A/TONE
ROW1
B/DIS
ROW2
ROW3
ROW4
ROW5
ROW6
Application UBA1702/A Line Interrupter Driver Ringer Circuit
HOOK
Application Note AN95023
MATRIX
Rehs 560k
HOOK
CRADLE
1N4148 1N4148 1N4148 130k 47nF
2322-186-16134
Rrng
2322-186-16134
2322-186-16392
BAS11
BSP254a n.c.
DP/FL
2222-035-68109
2222-035-68109
Crng1 1.5uF 250V
Crng2 1.5uF 250V
PN-solder_pin_1mm5
BR211-240 BAS11
PN-solder_pin_1mm5
RVOL0
Note: output 'LSE' must during ringing
COL1 COL2 COL3 COL4 COL5 COL6 HOOK
COL1 COL2 COL3 COL4 COL5 COL6
PCD3353A HOOK XTAL1 XTAL2 RESET CE/RF ROW1 ROW2
Rhook1
2322-186-16392
PD/DTMF MUTE ROW6 ROW5 ROW4 ROW3
3.58MHz
ROW1 ROW2
Figure Application UBA1702 with TEA1064B/1083(A)
n.c.
BAT85
UBA1702
2322-186-16392
BBBB BBBB BBBB BBBB
1N4148 BUZZER
2222-035-64479
Cvrr 22uF
2322-186-16392
Zbal
RVOL1
2222-035-64479
Cvdd 22uF
220nF
2322-186-16392
2322-186-16209
*C38 10nF
2222-629-03103
EARTH RVOL1 RVOL0 TONE
RVOL1 (MSB) RVOL0 (LSB) TONE
PULSE/DTMF SELECT
DP/FL
DP/FL
MUTE ROW6 ROW5 ROW4 ROW3
Application UBA1702/A Line Interrupter Driver Ringer Circuit
Application Note AN95023
2322-186-16681
Rvbb
2322-186-16134
Cvbb
Cdtmf2 100nF
Rdtmf1
Cdtmf1 100nF TONE Crmi
220uF
2222-035-68109
AD2071/50
100uF
2222-035-64479
470uF
120k
2322-186-16392
2222-035-68109
4.7uF
*C33
2222-629-03102
Rdtmf2
10nF
2222-035-68109
47uF
DP/FL MUTE
2322-186-16392
n.c.
SLPE
VEE2
MUTE
DTMF
VEE1
n.c. SREF n.c. n.c. n.c. LSI1
DP/FL
DLS/MMN
TEA1064B
GAS1 GAS2 QRQR+
TEA1083A
MICMIC+ STAB
Rmic220
MIC1 220nF *C37
2322-186-16392
n.c. n.c. LSI2
2222-631-70561
2222-035-64479
2222-631-10101
100pF 100k 47uF *Rqr
2322-186-16362
22nF Rmic
100pF
Cdls
2222-629-03102
Smmute
2222-629-03102
Rmic+ *C36 220nF
470nF *C35 *C38 Rdls
2322-186-16362
22nF
2322-186-16362
*C34 2.2nF Earpiece
2.2nF2.2nF
2.2nF 2.2nF
COL1
COL2
COL3
COL4
COL5
COL6
A/TONE
ROW1
B/DIS
ROW2
C/PR
ROW3
ROW4
Thook BC547
ROW5
ROW6
Rhook2
2322-186-16681
MATRIX
560k Rhook3
2322-186-16392
components marked with

AN95023 Application UBA1702/A Line Interrupter Driver Ringer Circ

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