Serially Interfaced, 4-Digit Driver AS1105 DATA SHEET C
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Data Sheet AS1105
Serially Interfaced, 4-Digit Driver
AS1105
DATA SHEET
Cost effective version AS1100 functionality applications 4-Digits 10MHz Serial Interface Individual Segment Control Decode/No-Decode Digit Selection 20µA Low-Power Shutdown (Data Retained) Extremely Operating Current 0.5mA open loop Digital Analog Brightness Control Display Blanked Power-Up Drive Common-Cathode Display Software Reset Optional External clock Packages
Every individual segment addressed updated separately. Only external resistor required current through display. Brightness controlled either analog digital way. user choose internal code-B decoder display numeric digits address each segment directly. AS1105 features extremely shutdown current only 20µA. operational current less than 500µA. number visible digits programmed well. AS1105 reset software external clock used. Several test modes support easy debugging. AS1105 offered SOIC package.
Applications
General Description
AS1105 driver segment numeric displays digits. AS1105 programmed conventional wire serial interface. includes code-B decoder, multiplex scan circuitry, segment display drivers memory. memory used store settings, that continuous reprogramming necessary.
Bar-Graph Displays Industrial Controllers Panel Meters Matrix Displays White Goods
DOUT
ISET
9.53k ISET MOSI LOAD DIG0-DIG3 Digits
DIG0
DIG2 DIG3
AS1105
DIG1 LOAD
Typical Application Circuit
Segments
Configuration
4-Digit Display
Software Reset external clock supported MAX7219
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Data Sheet AS1105
Absolute Maximum Ratings
Voltage (with respect GND) DIN, CLK, LOAD Other Pins Current DIG0-DIG3 Sink Current SEGA-G, Source Current Continuous Power Dissipation +85°C) Wide (derate 11.8mW/°C above +70°C) Operating Temperature Ranges AS1105xL AS1105xE Storage Temperature Range Package body temperature -0.3V -0.3V -0.3V (VDD +0.3V)
500mA 100mA
941mW
+70°C -40°C +85°C -65°C +150°C +240°C
Electrical Characteristics
(VDD 9.53k±1%, unless otherwise noted.) Parameter Operating Supply Voltage Symbol Conditions digital inputs GND, Shutdown Supply Current +25°C open circuit Operating Supply Current segments decimal point 40mA Display Scan Rate Digit Drive Sink Current DIGIT 0.65V Segment Drive Source Current +25°C, (VDD -1V) Segment Drive Current Matching Digit Drive Source Current DIGIT Digit off, (VDD -0.3V) Segment Drive Sink Current Segment off, 0.3V Logic Inputs Input Current DIN, CLK, LOAD Logic High Input Voltage 1300 Units
reflow peak soldering temperature (body temperature) specified according IPC/JEDEC J-STD-020B "Moisture/Reflow Sensitivity Classification non-hermetic Solid State Surface Mount Devices".
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Data Sheet AS1105
Parameter Logic Input Voltage Output High Voltage Output Voltage Hysteresis Voltage Timing Characteristics Clock Period Pulse Width High Pulse Width Rise LOAD Rise Hold Time Setup Time Hold Time Output Data Propagation Delay LOAD Rising Edge Next Clock Rising Edge Minimum LOAD Pulse High Data-to-Segment Delay
Symbol LDCK DSPD
Conditions DOUT, SOURCE -1mA DOUT, SINK 1.6mA DIN, CLK, LOAD
Units
LOAD 50pF
2.25
Description
3,8,5,6 Name DOUT DIG0-DIG3 LOAD Function Serial data output cascading drivers. output valid after 16.5 clock cycles. output never high impedance. Data input. Data programmed into 16Bit shift register rising edge digit driver lines that sink current from common cathode display. shutdown mode AS1105 switches outputs both pins must connected Strobe input. With rising edge LOAD signal serial data latched into register. Clock input. interface capable support clock frequencies 10MHz. serial data clocked into internal shift register with rising edge signal. DOUT data applied with falling edge CLK. Seven segment driver lines including decimal point. When segment turned output connected GND. current into determines peak current through segments therefore brightness. Positive Supply Voltage (+5V)
11-14, 17-20
A-G, ISET
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Data Sheet AS1105
LOAD
LDCK
DOUT
Figure Timing diagram
Address
Table Serial data format bits)
Data
Detailed Description
Serial-Addressing Modes Programming AS1105 done wire serial interface. programming sequence consists 16-bit packages. data shifted into internal register with rising edge signal. With rising edge LOAD signal data latched into digital control register depending address. LOAD signal must high after rising clock edge. LOAD signal also come later just before next rising edge CLK, otherwise data would lost. content internal shift register applied 16.5 clock cycles later DOUT pin. data clocked falling edge CLK. Bits 16Bitprogramming package described table first Bits D15-D12 "don't care, D11-D8 contain address D7-D0 contain data. first D15, most significant (MSB). exact timing given figure Digit Control Registers AS1105 incorporates registers, which listed Table digit control registers selected 4Bit address word. digit registers realized with
32bit memory. Each digit controlled directly without rewriting whole contents. control registers consist decode mode, display intensity, number scanned digits, shutdown, display test reset/external clock register. Shutdown Mode AS1105 features shutdown mode, where consumes only 20µA current. shutdown mode entered write register 0Ch. Then segment current sources pulled ground digit drivers connected VDD, that nothing displayed. internal digit registers keep programmed values. shutdown mode either used power saving generating flashing display repeatedly entering leaving shutdown mode. AS1105 needs typically 250µs exit shutdown mode. During shutdown AS1105 fully programmable. Only display test function overrides shutdown mode. Initial Power-Up After powering system register reset, that display blank. AS1105 starts shutdown mode. registers should programmed normal operation. default settings enable only scan digit, internal decoder disabled, data register intensity register minimum value.
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Data Sheet AS1105
Decode-Mode Register AS1105 decoder included. Every digit selected register decoded. code consists numbers 0-9, E,H, register logic high enables decoder appropriate digit. case that decoder bypassed (logic low) data Bits D7-D0 correspond segment lines AS1105. table some possible settings register shown. which corresponds decimal point, affected settings decoder. Logic high means that decimal point displayed. table font Code decoder shown. table correspondence register appropriate segments segment display shown (see figure Intensity Control Interdigit Blanking Brightness display controlled analog changing external resistor current, which flows between defines current that flows through LEDs. current times current. minimum value should 9.53k, which corresponds 40mA segment current. brightness display also controlled digitally register 0Ah. brightness programmed steps shown table internal pulse width modulator controls intensity display. Scan-Limit Register scan limit register selects number digits displayed. When digits displayed update frequency typically 800Hz. number digits displayed reduced, update frequency reduced well. frequency calculated using 8fOSC/N, where number digits. Since number displayed digits influences brightness, resistor Register Data
should adjusted accordingly. Table shows maximum allowed current, when fewer than digits used. avoid differences brightness scan limit register should used blank portions display (leading zeros). Address D15-D12 Code 0xX0 0xX1 0xX2 0xX3 0xX4 0xX9 0xXA 0xXB 0xXC 0xXD 0xXE 0xXF
Register No-Op Digit Digit Digit Digit Decode Mode Intensity Scan Limit Shutdown used Reset ext. Clock Display Test
Table Register address
Mode Shutdown Mode Normal Operation
Address Code Register Data (Hex) 0xXC 0xXC
Table Shutdown register format (address (hex) 0xXC)
Decode Mode decode digits Code decode digit decode digits Code decode digits Code decode digits
Code 0x00 0x01 0x0F 0xFF
Table Decode-mode register examples (address (hex) 0xX9)
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Data Sheet AS1105
7-Segment Character blank
Table Code font
Register Data D6-D4
Segments
*The decimal point
Corresponding Segment Line
Register Data
Table No-decode mode data bits corresponding segment lines
Figure Standard 7-segment
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Data Sheet AS1105
Duty Cycle 1/32 (min 3/32 5/32 7/32 9/32 11/32 13/32 15/32 17/32 19/32 21/32 23/32 25/32 27/32 29/32 31/32 (max
Code 0xX0 0xX1 0xX2 0xX3 0xX4 0xX5 0xX6 0xX7 0xX8 0xX9 0xXA 0xXB 0xXC 0xXD 0xXE 0xXF
Table Intensity register format (address (hex) 0xXA)
Scan Limit Display Display Display Display digit only digits digits digits
Register Data
Code 0xX0 0xX1 0xX2 0xX3
Table Scan-limit register format (address (hex) 0xXB)
Display Test Register With display test register tested. test mode LEDs switched maximum brightness (duty cycle 31/32). programming digit control registers maintained. format register given table Number Digits Displayed Maximum Segment Current (mA)
Register Data Normal Operation Display Test Mode Mode
Table Display-test register format (address (hex) 0xXF)
Note: AS1105 remains display-test mode until display-test register reconfigured normal operation. No-Op Register (Cascading AS1105) no-operation register used when AS1105s cascaded order support more than digit displays. cascading must done that DOUT connected following AS1105. LOAD signals connected devices. write operation example fifth device command must followed four no-operation commands.
Table Maximum segment current 3-digit displays
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Data Sheet AS1105
When LOAD signal finally goes high shift registers latched. first four devices have no-operation commands only fifth device sees intended command updates register. Reset external Clock Register This register addressed serial interface. allows switch device external clock mode D0=1 serial interface operates system clock input.) apply external reset (D1). This brings registers (except reg. default state. standard operation register contents should "00h".
Applications Information
Supply Bypassing Wiring order achieve optimal performance AS1105 shall placed very close display minimize effects electromagnetic interference wiring inductance. Furthermore recommended connect 10µF electrolytic 0.1µF ceramic capacitor between avoid power supply ripple. Also, both GNDs must connected ground. Selecting Resistor Using External Drivers current through segments controlled external resistor Segment current about times current right values given table maximum current AS1105 drive 40mA. higher currents needed, external drivers must used. that case longer necessary that AS1105 drives high currents. recommended value 47k. cases that AS1105 only drives digits table specifies maximum currents must accordingly. Refer absolute maximum ratings calculate acceptable limits ambient temperature, segment current, forward-voltage drop.
Mode Normal Operation, internal clock Normal Operation, external clock Reset state, internal clock Reset state, external clock
Address Register Data code (hex) 0xXE 0xXE 0xXE 0xXE
Table Reset external Clock register (address (hex) 0xXE)
(mA)
12.2 17.8 29.8 66.7
11.8 17.1 28.0 63.7
11.0 15.8 25.9 59.3
10.6 15.0 24.5 55.4
9.69 14.0 22.6 51.2
Table RSET segment current forward voltage
This register used MAX7219, since does support software reset external clocks
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Data Sheet AS1105
Matrix Driver
example Figure uses AS1105 drive matrix. columns have common cathode connected DIG0-3 outputs. rows connected segment drivers. Each LEDs addressed separately. columns selected digits shown Table decode mode register (0xX9) programmed `00000000' stated Table single LEDs column addressed stated Table where corresponds segment segment multiple digit matrix several AS1105 have cascaded.
Diode Arrangement
DOUT ISET
VBAT
ISET
VBAT
9.53k
9.53k
Figure Application example matrix driver
Cascading Drivers AS1105 cascaded well. DOUT must connected following AS1105. Thermal Resistance Package Wide +85°C/W Maximum Junction Temperature +150°C Maximum Ambient Temperature +85°C
Table Package thermal resistance data
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Data Sheet AS1105
Computing Power Dissipation upper limit power dissipation (PD) AS1105 determined from following equation: (VDD 0.5mA) (VDD )(DUTY where: supply voltage DUTY duty cycle intensity register number segments driven (worst case forward voltage segment current Dissipation Example: 40mA, DUTY 31/32, 1.8V 40mA, 5.25V 5.25V(0.5mA) (5.25V 1.8V)(31/32 40mA 0.54W Thus, package +85°C/W (from Table 13), maximum allowed ambient temperature given J,MAX 150°C +0.54W 85°C/W. where +104°C.
Package Information
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Data Sheet AS1105
Figure SOIC-20 package dimensions
Segment Driver Capability, Logic Level High Upper Limit
Segment Current Lower Limit
Voltage below output
Figure Segment driver capability
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Data Sheet AS1105
Segment Current f(RSET)
ISEGMENT
RSET kOhm
Figure Segment Current versa
Ordering Information
Part AS1105WL AS1105WE AS1105WL-T Temp Range Package +70°C Wide -40°C +85° Wide +70°C Wide Delivery Form Tubes
Copyright
Copyright 2004 austriamicrosystems. Trademarks registered rights reserved. material herein reproduced, adapted, merged, translated, stored, used without prior written consent copyright owner. best knowledge, austriamicrosystems asserts that information contained this publication accurate correct.
Contact
austriamicrosystems 8141 Schloss Austria 3136 3136 info@austriamicrosystems.com
Austriamicrosystems reserves right change circuitry specifications without notice time.
Contact factory availability
Revision 1.32, Oct. 2004
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