General Description AS1100 driver segment numeric displays digits
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Serially Interfaced, 8-Digit Driver
General Description
AS1100 driver segment numeric displays digits. AS1100 programmed conventional wire serial interface. device includes code-B decoder, multiplex scan circuitry, segment display drivers, memory. memory used store settings, that continuous reprogramming necessary. 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. AS1100 features extremely shutdown current only 20µA operational current less than 500µA. number visible digits programmed well. AS1100 reset software external clock used. Several test modes support easy debugging. AS1100 offered 24-pin SOIC packages.
Features
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 24-pin SOIC Packages
Applications
AS1100 ideal solution Bar-Graph Displays, Industrial Controllers, Panel Meters, Matrix Displays White Goods such washing machines dishwasher.
Figure Typical Application Diagram Single Cell 3.3V Synchronous Boost Converter
9.53k MOSI ISET DIFG0-DIG3 Digits
LOAD
Segments
8-Digit Display
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Revision 1.33
AS1100
Data Sheet
Assignments
Figure Assignments (Top View)
DOUT ISET DIP/SO
DIG0 DIG4 DIG6 DIG2 DIG3 DIG7 DIG5 DIG1 LOAD12
AS1100
Descriptions
Table Descriptions Name LOAD/CS Number 5-8, Description Data input. Data programmed into 16Bit shift register rising edge digit driver lines that sink current from common cathode display. shutdown mode AS1100 switches outputs VDD. 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 ISET determines peak current through segments therefore brightness. Positive Supply Voltage (+5V) Serial data output cascading drivers. output valid after 16.5 clock cycles. output never high impedance.
14-17, 20-23
A-G, ISET DOUT
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Revision 1.33
AS1100
Data Sheet
Absolute Maximum Ratings
Table Absolute Maximum Ratings Parameter DIN, CLK, LOAD other Pins VOUT Electro Static Discharge Digital Outputs Electro Static Discharge other pins Current DIG0-DIG7 Sink Current SEGA-G, Source Current Latch Immunity Continuous Power Dissipation +85°C) Narrow Plastic Wide Operating Temperature Ranges (TMIN TMAX) AS1100xL AS1100xE Storage Temperature Range +150 reflow peak soldering temperature (body temperature) specified accordance with IPC/JEDEC J-STD020C "Moisture/Reflow Sensitivity Classification Non-Hermetic Solid State Surface Mount Devices". lead finish Pb-free leaded packages matte (100% Sn). 1066 Derate 13.3mW/°C above +70°C Derate 11.8mW/°C above +70°C ±200 -0.3 -0.3 -0.3 -0.3 +500 +1000 Units Notes
Package Body Temperature
+260
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Revision 1.33
AS1100
Data Sheet
Electrical Characteristics
RSET 9.53k±1%, TMIN TMAX, unlesss otherwise noted. Table Electrical Characteristics Symbol IDDSD Parameter Operating Supply Voltage Shutdown Supply Current digital inputs GND, RSET open circuit fOSC IDIGIT ISEG ISEG IDIGIT ISEG IIH, Operating Supply Current Display Scan Rate Digit Drive Sink Current Segment Drive Source Current Segment Drive Current Matching Digit Drive Source Current Segment Drive Sink Current Digit off, VDIGIT (VDD -0.3V) Segment off, VSEG 0.3V segments decimal point ISEG -40mA digits scanned VOUT 0.65V VOUT (VDD -1V) 1300 Conditions Units
Logic Inputs Input Current DIN, CLK, LOAD Logic High Input Voltage Logic Input Voltage Output High Voltage Output Voltage Hysteresis Voltage Timing Characteristics tCSH tLDCK tCSW tDSPD 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 CLOAD 50pF 2.25 DOUT, ISOURCE -1mA DOUT, ISINK 1.6mA DIN, CLK, LOAD
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Revision 1.33
AS1100
Data Sheet
Typical Operating Characteristics
Figure Segment Driver Capability, Logic Level High
Figure Segment Current versa RSET
Segment Current (mA)
ISEGMENT (mA)
Voltage below output
RSET (kOhm)
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Revision 1.33
AS1100
Data Sheet
Detailed Description
Serial-Addressing Modes
Programming AS1100 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 16th 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 16Bit-programming 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 Figure Timing Diagram
LOAD
tCSW
tLDCK
DOUT
Table Serial data format (16bits)
Address
Data
Digit Control Registers
AS1100 incorporates registers, which listed Table digit control registers selected 4Bit address word. digit registers realized with 64bit 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
AS1100 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. AS1100 needs typically 250µs exit shutdown mode. During shutdown AS1100 fully programmable. Only display test function overrides shutdown mode.
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Revision 1.33
AS1100
Data Sheet
Initial Power-Up
After powering system register reset, that display blank. AS1100 starts shutdown mode. registers should programmed normal operation. default settings enable only scan digit, internal decoder disabled, data register intensity register minimum value.
Decode-Mode Register
AS1100 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 AS1100. 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 (RSET). current, which flows between ISET, defines current that flows through LEDs. current times ISET current. minimum value RSET 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 RSET 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). Table Register address Register No-Op Digit Digit Digit Digit Digit Digit Digit Digit Decode Mode Intensity Scan Limit Shutdown used Reset ext. Clock Display Test Address D15-D12 Code 0xX0 0xX1 0xX2 0xX3 0xX4 0xX5 0xX6 0xX7 0xX8 0xX9 0xXA 0xXB 0xXC 0xXD 0xXE 0xXF
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Revision 1.33
AS1100
Data Sheet
Table Shutdown Register Format (address (hex) 0xXC Mode Shutdown Mode Normal Operation Address Code (Hex) 0xXC 0xXC Register Data
Table Decode-mode Register Examples (address (hex) 0xX9 Decode Mode decode digits Code decode digit decode digits Code decode digits decode digits Code decode digits Table Code font 7-Segment Character blank Register Data D6-D4 Segments Register Data Code 0x00 0x01 0x0F 0xFF
Note: decimal point Table No-decode mode data bits corresponding segment lines Register Data Corresponding Segment Line
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Revision 1.33
AS1100
Data Sheet
Figure Standard 7-segment
Table Intensity register format (address (hex) 0xXA) 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 Scan -limit register format (address (hex) 0xXB) Decode Mode Display digit only Display digit Display digit Display digit Display digit Display digit Display digit Display digit Register Data Code 0xX0 0xX1 0xX2 0xX3 0xX4 0xX5 0xX6 0xX7
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Revision 1.33
AS1100
Data Sheet
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 Table Maximum segment current 3-digit displays Number digits Displayed Table Display-test register format (address (hex) 0xXF) Mode Normal Operation Display Test Mode Register Data Maximum Segment Current (mA)
Note: AS1100 remains display-test mode until display-test register reconfigured normal operation.
No-Op Register (Cascading AS1100)
no-operation register used when AS1100s cascaded order support more than digit displays. cascading must done that DOUT connected DINof following AS1100. LOAD signals connected devices. write operation example fifth device command must followed four no-operation commands. 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". Table Reset External Clock Register (address (hex) oxXE) Mode Normal Operation, internal clock Normal Operation, external clock Reset state, internal clock Reset state, external clock Address code (Hex) 0xXE 0xXE 0xXE 0xXE Register Data
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Revision 1.33
AS1100
Data Sheet
Application Information
Supply Bypassing Wiring
order achieve optimal performance AS1100 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 RSET Resistor Using External Drivers
current through segments controlled external resistor RSET. Segment current about times current ISET. right values ISET given Table maximum current AS1100 drive 40mA. higher currents needed, external drivers must used. that case longer necessary that AS1100 drives high currents. recommended value RSET 47k. cases that AS1100 only drives digits, Table specifies maximum currents RSET must accordingly. Refer absolute maximum ratings calculate acceptable limits ambient temperature, segment current, forward-voltage drop. Table RSET segment current forward voltage ISEG (mA) VLED(V) 12.2k 17.8k 29.8k 66.7k 11.8k 17.1k 28.0k 63.7k 11.0k 15.8k 25.9k 59.3k 10.6k 15.0k 24.5k 55.4k 9.69k 14.0k 22.6k 51.2k
Matrix Driver
example Figure uses AS1100 drive matrix. columns have common cathode connected DIG0-7 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 AS1100 have cascaded.
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Revision 1.33
AS1100
Data Sheet
Figure Application example matrix driver
9.53k
9.53k
ISET
ISET
Cascading Drivers
AS1100 cascaded well. DOUT must connected following AS1100.
Table Package thermal resistance data Package Narrow Wide Maximum Junction Temperature (TJ) Maximum Ambient Temperature (TA) Thermal Resistance (JA)
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Revision 1.33
AS1100
Data Sheet
Computing Power Dissipation
upper limit power dissipation (PD) AS1100 determined from following equation: (VDD 0.5mA) (VDD VLED)(DUTY ISEG Where: supply voltage DUTY duty cycle intensity register number segments driven (worst case VLED forward voltage ISEG segment current RSET Dissipation Example: ISEG 40mA, DUTY 31/32, VLED 1.8V 40mA, 5.25V 5.25V(0.5mA) (5.25V 1.8V)(31/32 40mA 1.07W Thus, PDIP package +75°C/W (from Table 13), maximum allowed ambient temperature given TJ,MAX 150°C +1.07W 75°C/W. Where: +69.7°C. limit Packages dissipation example above +59.0°C.
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Revision 1.33
AS1100
Data Sheet
Package Drawings Markings
device available SOIC-24 package PDIP-24 package Figure SOIC-24 package Diagram
Table SOIC-24 package Dimensions Symbol 2.44 0.10 2.24 0.36 0.23 15.20 7.40 1.27 2.64 0.30 2.44 0.46 0.32 15.40 7.60 Symbol 0.51 0.63 0.66 10.11 0.31 0.53 1.01 0.89 10.51 0.71 0.73
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Revision 1.33
AS1100
Data Sheet
Figure PDIP-24 package Diagram
Table PDIP-24 package Dimensions Symbol 0.380 0.38 1.40 1.14 0.20 31.62 7.62 0.46 1.52 1.27 0.25 31.75 0.56 1.65 1.40 0.30 31.88 8.26 4.32 Symbol 1.78 1.40 3.18 1.52 3.30 1.91 2.03 1.65 6.35 6.60 2.54 7.62 3.43 6.86
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Revision 1.33
AS1100
Data Sheet
Ordering Information
Table Ordering Information Part AS1100PL AS1100WL AS1100PE AS1100WE AS1100WL-T AS1100WE-T Temp Range Package Plastic 24-pin SOIC 24-pin Plastic 24-pin SOIC 24-pin SOIC 24-pin SOIC 24-pin Delivery Form Tubes Tubes Tubes Tubes Tape Reel Tape Reel
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Revision 1.33
AS1100
Data Sheet
Copyrights
Copyright 1997-2007, austriamicrosystems Schloss Premstaetten, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered rights reserved. material herein reproduced, adapted, merged, translated, stored, used without prior written consent copyright owner. products companies mentioned trademarks registered trademarks their respective companies.
Disclaimer
Devices sold austriamicrosystems covered warranty patent indemnification provisions appearing Term Sale. austriamicrosystems makes warranty, express, statutory, implied, description regarding information forth herein regarding freedom described devices from patent infringement. austriamicrosystems reserves right change specifications prices time without notice. Therefore, prior designing this product into system, necessary check with austriamicrosystems current information. This product intended normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, high reliability applications, such military, medical life-support life-sustaining equipment specifically recommended without additional processing austriamicrosystems each application. shipments less than parts manufacturing flow might show deviations from standard production flow, such test flow test location. information furnished here austriamicrosystems believed correct accurate. However, austriamicrosystems shall liable recipient third party damages, including limited personal injury, property damage, loss profits, loss use, interruption business indirect, special, incidental consequential damages, kind, connection with arising furnishing, performance technical data herein. obligation liability recipient third party shall arise flow austriamicrosystems rendering technical other services.
Contact Information
Headquarters austriamicrosystems A-8141 Schloss Premstaetten, Austria Tel: 3136 Fax: 3136
Sales Offices, Distributors Representatives, please visit:
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Revision 1.33
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