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Switching Behavior L9215/16 Ringing SLIC
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This application note describes recommended operation Lucent L9215/16 ringing SLICs switching ring mode during both ringing cadence ring trip. also discusses forward/reverse battery state transition, state transition general, battery switch operation timing. This application note assumes user knowledge L9215/16 ringing SLIC operation.
Scope. Control Signal Timing During Ring Cadence Sine Wave Input Mode Operation Square Wave Input Mode Operation State Transition. Transition from High Battery Active Battery Active States.
Figures
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Figure NSTAT Glitch Figure Square Wave Input Mode Operation Figure Effect Battery Reversal NSTAT
Switching Behavior L9215/16 Ringing SLIC
L9215/16 traces, following true:
Control Signal Timing During Ring Cadence
L9215/16 used basic modes operation create power ringing signal. These modes discussed detail L9215/16 data sheet. brief, first mode operation, input RINGIN sine wave filtered produce sine ring signal ring. second mode operation uses filtered square wave input RINGIN. This creates trapezoidal waveform ring. either state operation, input RINGIN amplified create power ring signal seen ring.
Channel represents SLIC control signal Channel represents SLIC loop supervision output NSTAT. Channel represents SLIC output DCOUT. Channel represents ring voltage
seen Figure under these conditions with load, glitch NSTAT present. width this glitch depends phase sine wave time state transition. appropriate software filter recommended eliminate this glitch.
Sine Wave Input Mode Operation
This SLIC creates ringing amplifying low-voltage input dedicated input (RINGIN). ring mode achieved toggling logic (BR) low. This turns ringing amplifier puts amplified ring signal ring. During nonring modes high), since state SLIC affected RINGIN, ringing amplifier low-voltage sinusoidal waveform input signal left RINGIN. controlling ring cadence. this mode operation, there certain considerations that should made with respect false loop supervision glitches seen NSTAT. results, ringing load 1386 capacitor used. additional loop resistance added except protection resistors. loop supervision threshold
140.0
Figure NSTAT Glitch
Lucent Technologies Inc.
Switching Behavior L9215/16 Ringing SLIC
seen, when leaving ring mode, there delay timing toggling from high with respect timing removing square wave RINGIN. square wave RINGIN removed held equivalent additional cycle ringing ms). Using this timing method, very minimal glitch seen NSTAT during state transition. delay method also used when entering ring mode. seen, square wave RINGIN applied cycles ringing before toggled high low. This timing eliminates glitch NSTAT. Holding high cycles conservative many cases cycle adequate. case, recommend having digital filtering NSTAT output. purpose here minimize length digital filter manageable time.
Control Signal Timing During Ring Cadence (continued)
Square Wave Input Mode Operation
With square wave approach, during nonring modes, square wave input also left RINGIN. this case timing considerations that were discussed with sine wave input mode operation will also apply. However with square wave input, during nonring modes, device operated removing square wave from RINGIN. this mode operation, unlike sine wave case where only controls ring cadence, both square wave input RINGIN used control ringing cadence. This mode operation different considerations advantages with respect NSTAT glitch compared sine wave approach. These considerations advantages discussed below. Figure
Channel represents CMOS input RINGIN.
Channel represents Channel represents NSTAT.
Note:
Channel represents ring.
Ring load 1386 frequency VBAT Vrms Vp-p crest factor 1.3.
Figure Square Wave Input Mode Operation
Lucent Technologies Inc.
Switching Behavior L9215/16 Ringing SLIC
state transition from reverse forward battery cause glitch with capacitive load. Conservative design practice will result appropriate deglitch NSTAT after state transition.
State Transition
following recommendations describe which state switch when switching ring state during ring cadence ring trip. recommended operation forward battery applications ringing from forward battery high battery state, such forward active (with without PPM, applicable) forward scan state, forward battery portion ringing possible). ringing should forward battery portion ringing cycle possible) forward active high battery state during silent portion ringing, ring trip detected. Transition scan state also allowed on-hook transmission required. reverse battery applications, transitions ringing should cause polarity reversal. recommended transition from reverse battery high battery active reverse battery portion ringing back reverse battery high battery active. With SLIC, state transition causes battery reversal, this will cause loop current flow cause false loop status glitch loop closure detector. This illustrated Figure Figure uses L8560 SLIC results apply SLIC. figure below shows effect simple battery reversal NSTAT. load capacitor.
140.0
Figure Effect Battery Reversal NSTAT
Transition from High Battery Active Battery Active States
During ringing, scanning, on-hook transmission modes, SLIC voltage derived from higher-voltage battery. Upon legitimate off-hook condition, minimize off-hook power, typical SLIC battery switch feature switch lowervoltage auxiliary VBAT2. L9215/16 SLIC battery switch that requires logic control switch from high battery battery. However, this transition done response dial pulse string, cause noise adjacent lines switching effect. lower-voltage battery good drive capability, this effect will minimal. Once legitimate off-hook recognized, recommended that delay used prior switching lowvoltage battery.
Channel represents SLIC control signals Channel represents SLIC control signal Channel represents SLIC loop supervision output NSTAT. Channel represents DCOUT.
SLIC reverse battery when low, forward battery when high. seen, simple
additional information, contact your Microelectronics Group Account Manager following: INTERNET: http://www.lucent.com/micro E-MAIL: docmaster@micro.lucent.com AMERICA: Microelectronics Group, Lucent Technologies Inc., Union Boulevard, Room 30L-15P-BA, Allentown, 18109-3286 1-800-372-2447, 610-712-4106 CANADA: 1-800-553-2448, 610-712-4106) ASIA PACIFIC: Microelectronics Group, Lucent Technologies Singapore Pte. Ltd., Science Park Drive, #03-18 Cintech III, Singapore 118256 Tel. (65) 8833, (65) 7495 CHINA: Microelectronics Group, Lucent Technologies (China) Co., Ltd., A-F2, 23/F, Fong Universe Building, 1800 Zhong Shan Road, Shanghai 200233 China Tel. (86) 6440 0468, ext. 325, (86) 6440 0652 JAPAN: Microelectronics Group, Lucent Technologies Japan Ltd., 7-18, Higashi-Gotanda 2-chome, Shinagawa-ku, Tokyo 141, Japan Tel. (81) 5421 1600, (81) 5421 1700 EUROPE: Data Requests: MICROELECTRONICS GROUP DATALINE: Tel. (44) 7000 368, (44) 1189 Technical Inquiries: GERMANY: (49) 95086 (Munich), UNITED KINGDOM: (44) 1344 (Ascot), FRANCE: (33) (Paris), SWEDEN: (46) (Stockholm), FINLAND: (358) 3507670 (Helsinki), ITALY: (39) 6608131 (Milan), SPAIN: (34) 1441 (Madrid)
Lucent Technologies Inc. reserves right make changes product(s) information contained herein without notice. liability assumed result their application. rights under patent accompany sale such product(s) information.
Copyright 2000 Lucent Technologies Inc. Rights Reserved Printed U.S.A.
October 2000 AP00-076ALC (Replaces AP00-043ALC)

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