General Description AS1105 driver 7-segment numeric displays digi

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General Description AS1105 driver 7-segment numeric displays digi

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Serially Interfaced, 4-Digit Driver
General Description
AS1105 driver 7-segment numeric displays digits. AS1105 programmed conventional 4-wire serial interface. device includes code-B decoder, multiplex scan circuitry, segment display drivers, 32-bit 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. 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 20-pin SOIC package.
Features
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 20-pin SOIC Package
Applications
AS1105 ideal solution Bar-Graph Displays, Industrial Controllers, Panel Meters, Matrix Displays White Goods such washing machines, dishwasher, etc.
Figure Typical Application Circuit
9.53k ISET DIFG0-DIG3 Digits MOSI LOAD Segments
4-Digit Display
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Revision 1.34
AS1105
Data Sheet
Assignments
Figure Configuration (Top View)
DOUT DIG0 DIG2 DIG3 DIG1 LOAD
ISET
AS1105
Descriptions
Table Descriptions Name DOUT DIG0-DIG3 LOAD Number Description
A-G, ISET
Serial data output cascading drivers. output valid after 16.5 clock cycles. output never high impedance. Data input. Data programmed into 16-bit shift register rising edge. 4-digit driver lines that sink current from common cathode 3,8,5,6 display. shutdown mode AS1105 switches outputs VDD. Both pins must connected. Strobe input. With rising edge LOAD signal 16-bit 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 11-14, 17-20 segment turned output connected GND. current into ISET determines peak current through segments therefore brightness. Positive Supply Voltage (+5V)
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AS1105
Data Sheet
Absolute Maximum Ratings
Table Absolute Maximum Ratings Parameter DIN, CLK, LOAD Other pins Current DIG0-DIG3 Sink Current SEGA-G, Source Current Continuous Power Dissipation +85°C) Wide Operating Temperature Range Storage Temperature Range +150 reflow peak soldering temperature (body temperature) specified according IPC/JEDEC J-STD-020C "Moisture/Reflow Sensitivity Classification non-hermetic Solid State Surface Mount Devices". Derate above -0.3 -0.3 -0.3 Units Notes
Package body temperature
+260
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AS1105
Data Sheet
Electrical Characteristics
RSET 9.53k±1%, TMIN TMAX, unless 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 VOUT 0.65V VOUT (VDD -1V) segments decimal point ISEG -40mA 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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AS1105
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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AS1105
Data Sheet
Detailed Description
Serial-Addressing Modes
programming AS1105 done 4-wire serial interface. programming sequence consists 16-bit packages. data shifted into internal 16-Bit 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 DOUT tLDC
Table Serial Data Format Bits) Data
Address
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.
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AS1105
Data Sheet
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.
Decode-Mode Register
AS1105, decoder included. Every digit selected register decoded. code consists numbers 0-9, E,H, register 09h, 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 (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 Decode Mode Intensity Scan Limit Shutdown used Reset ext. Clock Display Test Register D15-D12 Code 0xX0 0xX1 0xX2 0xX3 0xX4 0xX9 0xXA 0xXB 0xXC 0xXD 0xXE 0xXF
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AS1105
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 Code decode digits Table Code font 7-Segment Character blank Register Data D6-D4 Segments Register Data Code 0x00 0x01 0x0F 0xFF
Note: above table, decimal point (DP) Table No-decode mode data bits corresponding segment lines Register Data Corresponding Segment Line
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AS1105
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) Scan Limit Display digit only Display digits Display digits Display digits Register Data Code 0xX0 0xX1 0xX2 0xX3
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AS1105
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: 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. 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) 0xXE) 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
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
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AS1105
Data Sheet
Application 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 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 AS1105 drive 40mA. higher currents needed, external drivers must used. that case longer necessary that AS1105 drives high currents. recommended value RSET 47k. cases that AS1105 only drives digits Table specifies maximum currents RSET must accordingly. Refer Absolute Maximum Ratings calculate acceptable limits ambient temperature, segment current, forward-voltage drop.
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. Figure Application example matrix driver
Diode Arrangement
DOUT
DOUT ISET 9.53k VBAT
VBAT
ISET
9.53k
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AS1105
Data Sheet
Cascading Drivers
AS1105 cascaded well. DOUT must connected following AS1105. Table Package Thermal Resistance Data Package Wide Thermal Resistance (JA) +85°C/W Maximum Junction Temperature (TJ) +150°C Maximum Ambient Temperature (TA) +85°C
Computing Power Dissipation
upper limit power dissipation (PD) AS1105 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 0.54W Thus, package (see Table 13), maximum allowed ambient temperature given TJ,MAX +0.54W Where:
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AS1105
Data Sheet
Package Drawings Markings
device available 20-pin SOIC package. Figure SOIC-20 package drawings
Table SOIC-20 package dimensions Symbol 2.44 0.10 2.24 0.36 0.23 12.65 7.40 1.27 2.64 0.30 2.44 0.46 0.32 12.85 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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AS1105
Data Sheet
Ordering Information
device available standard products listed Table Table Ordering Information Part AS1105WL AS1105WL-T Temp Range Package 20-pin SOIC 20-pin SOIC Delivery Form Tubes
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AS1105
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
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General Description AS1105 driver 7-segment numeric displays digi

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