General Description AS1108 compact display driver 7-segment numer

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General Description AS1108 compact display driver 7-segment numer

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4-Digit Display Driver
General Description
AS1108 compact display driver 7-segment numeric displays digits. device programmed SPI, QSPI, Microwire well conventional 4-wire serial interface. device includes integrated code-B/HEX decoder, multiplex scan circuitry, segment display drivers, 32-bit memory. Internal memory stores settings, eliminating need continuous device reprogramming. Every segment individually addressed updated separately. Only external resistor (RSET) required current through display. brightness controlled analog digital means. device programmed internal code-B/HEX decoder display numeric digits directly address each segment. device features extremely shutdown current typically 3µA, operational current less than 500µA. number digits programmed, device reset software, external clock also supported. Additionally, segment blinking synchronized across multiple drivers. Several test modes available easy application debugging. device available 20-pin 20-pin SOIC package.
Features
10MHz SPI-, QSPI-, Microwire-Compatible Serial Individual Segment Control Segment Blinking Control (can synchronized across multiple drivers) Hexadecimal- BCD-Code/No-Decode Digit Selection Low-Power Shutdown Current (typ; data retained) Extremely Operating Current 0.5mA Open-Loop Digital Analog Brightness Control Display Blanked Power-Up Drive Common-Cathode Displays Supply Voltage Range: 3.6V Software Reset Optional External Clock Packages: 20-pin 20-pin SOIC
Applications
AS1108 ideal bar-graph displays, instrumentpanel meters, matrix displays, matrix displays, set-top boxes, white goods, professional audio equipment, medical equipment, industrial controllers panel meters.
Figure Typical Application Diagram
+3.3V 5.62k ISET Microprocessor LOAD/CSM 4-Digit Microprocessor Display DIG0 DIG3 Segments Digits
AS1108
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AS1108 Data Sheet
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Absolute Maximum Ratings
Stresses beyond those listed Table cause permanent damage device. These stress ratings only, functional operation device these other conditions beyond those indicated Section Electrical Characteristics page implied. Exposure absolute maximum rating conditions extended periods affect device reliability. Table Absolute Maximum Ratings Parameter Voltage (with respect GND) DIN, CLK, LOAD/CSM Other Pins Current 0:DIG Sink Current A:SEG Narrow Plastic Wide SOIC
-0.3 -0.3 -0.3 0.3v
1066 +150 +260 +260
Units
Notes
Continuous Power Dissipation (TAMB
Derate above Derate above
Operating Temperature Ranges (TMIN toTMAX) Storage Temperature Range Package Body Temperature (Wide SOIC) Soldering Temperature (Narrow DIP) Humidity Electrostatic Discharge
Digital Outputs Other Pins
1000 1000 200±
Non-condensing
Latch-Up
pins
reflow peak soldering temperature (body temperature) specified according IPC/JEDEC J-STD-020C "Moisture/Reflow Sensitivity Classification non-hermetic Solid State Surface Mount Devices". Specified according JESD22-B106 "Resistance Soldering Temperature Through-Hole Mounted Devices". Norm: method 3015. Norm: JEDEC
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AS1108 Data Sheet
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Electrical Characteristics
Conditions: 3.6V, RSET 5.62k±1%, TAMB TMIN TMAX (unless otherwise specified). Table Electrical Characteristics Parameter Operating Supply Voltage Shutdown Supply Current 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 Slow Segment Blink Period phase, Internal Oscillator) Fast Segment Blink Period phase, Internal Oscillator) Fast Slow Segment Blink Duty Cycle (Guaranteed design) Table Logic Inputs/Outputs Characteristics Parameter Input Current DIN, CLK, LOAD/CSM Logic High Input Voltage Logic Input Voltage Output High Voltage Output Voltage Hysteresis Voltage Table Timing Characteristics Parameter Clock Period Pulse Width High Pulse Width CSMFall-to-CLK Rise Setup Time (AS1108 SPI-programmed) Rise-to -LOAD/CSM Rise Hold Time Setup Time Hold Time Output Data Propagation Delay LOAD Rising Edge-to-Next Clock Rising Edge Minimum LOAD/CSM Pulse High Data-to-Segment Delay Symbol tCSS tCSH tLDCK tCSW tDSPD Conditions CLOAD 50pF 2.25 Unit Symbol IIH, DOUT, ISOURCE -1mA DOUT, ISINK 1.6mA DIN, CLK, LOAD/CSM Conditions Unit Symbol IDDSD fOSC IDIGIT ISEG ISEG IDIGIT ISEG tSLOWBLINK tFASTBLINK Digit off, VDIGIT (VDD 0.3V) Segment off, VSEG 0.5V 0.64 0.32 49.9 1.65 0.83 50.1 digital inputs GND, TAMB RSET open circuit. segments decimal point ISEG -40mA. digits scanned VOUT 0.65V 3.3V, VOUT (VDD -1V) 1000 1600 2600 Conditions Unit
Note: Figure page additional timing information.
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AS1108 Data Sheet
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Serial-Addressing Format
Detailed Description
Serial-Addressing Format
Programming AS1108 accomplished writing device's internal registers (see Digit- Control-Registers page 4-wire serial interface. programming sequence consists 16-bit packages depicted Table data shifted into internal 16-bit register with rising edge signal. With rising edge LOAD/CSM signal data latched into digit- control-register. LOAD/CSM signal must high after 16th rising clock edge. LOAD/CSM signal also come later this must happen just before next rising edge CLK, otherwise data will lost. contents internal shift register applied 16.5 clock cycles later DOUT. data clocked falling edge CLK. first bits (D15:D12) "don't care" settings, bits D11:D8 contain register's address, bits D7:D0 contain data. first D15, most significant (MSB). exact timing shown Figure Table 16-Bit Serial Data Format Register Address (see Table Data
Initial Power-Up
initial power-up, AS1108 registers reset their default values, display blanked, device goes into shutdown mode. registers should programmed normal operation this time. Note: default settings enable only scanning digit; internal decoder disabled Intensity Control Register (see page minimum values. Figure Interface Timing
LOAD/
tCSH tCSS tLDCK
tCSW
DOUT
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AS1108 Data Sheet
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Shutdown Mode
Shutdown Mode
AS1108 features shutdown mode, consuming only 10µA (max) current. Shutdown mode entered write Shutdown Register (see Table that point, segment current sources pulled ground digit drivers connected VDD, that segments blanked. Note: During shutdown mode Digit-Registers maintain their data. Shutdown mode either used means reduce power consumption generating flashing display (repeatedly entering leaving shutdown mode). minimum supply current shutdown mode, logic input should (CMOS logic level). device need typically 250µs exit shutdown mode, during shutdown mode AS1108 fully programmable. Only display test mode (see page overrides shutdown mode. When entering leaving shutdown mode, Feature Register reset default values (all when Shutdown Register (page When Feature Register left unchanged when entering leaving shutdown mode. Note: AS1108 used with external clock, Shutdown Register should when writing Shutdown Register.
Digit- Control-Registers
AS1108 contains four Digit-Registers control-registers, which listed Table registers selected using 4-bit address word, communication done serial interface.
Digit Registers These registers realized with on-chip 32-bit memory. Each digit controlled directly without rewriting whole register contents. Control Registers These registers consist decode mode, display intensity, number scanned digits, shutdown, display test features selection registers.
Table Register Address Register No-Op Digit Digit Digit Digit Decode-Mode Intensity Control Scan Limit Shutdown Feature Display Test Code 0xX0 0xX1 0xX2 0xX3 0xX4 0xX9 0xXA 0xXB 0xXC 0xXD 0xXE 0xXF Address D15:D12 Page
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AS1108 Data Sheet
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Digit- Control-Registers
6.4.1 Shutdown Register (0xXC)
Shutdown Register controls AS1108 shutdown mode (see Shutdown Mode page Table Shutdown Register Format (Address (HEX) 0xXC)) Mode Shutdown Mode, Reset Feature Register Default Settings Shutdown Mode, Feature Register Unchanged Normal Operation, Reset Feature Register Default Settings Normal Operation, Feature Register Unchanged Code 0x00 0x80 0x01 0x81 Register Data
6.4.2 Decode Enable Register (0xX9)
Decode Enable Register sets decode mode. BCD/HEX decoding (either code characters 0:9, code characters A:F) selected (page Feature Register. Decode Enable Register used select decode mode no-decode each digit. Each Decode Enable Register corresponds respective display digit (i.e., corresponds digit corresponds digit on). Table lists some examples possible settings Decode Enable Register bits. Note: logic high enables decoding logic bypasses decoder altogether. When decode mode used, decoder looks only lower-nibble (bits D3:D0) data Digit-Registers, disregarding bits D6:D4. sets decimal point (SEG independent decoder positive logic (bit turns decimal point on). Table lists code-B font; Table lists font. When no-decode mode selected, data bits D7:D0 Digit-Registers correspond segment lines AS1108. Table shows pairing each data appropriate segment line. Table Decode Enable Register Format (Address (HEX) 0xX9)) Decode Mode decode digits Code-B/HEX decode digit decode digits Code-B/HEX decode digits Code 0x00 0x01 0xFF Register Data
Figure Standard 7-Segment Intensity Control Inter-Digit Blanking
Table Code-B Font 7-Segment Character Register Data
Segments
D6:D4
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AS1108 Data Sheet
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Digit- Control-Registers
Table Code-B Font (Continued) 7-Segment Character Blank
Register Data
Segments
D6:D4
decimal point enabled setting
Table Font 7-Segment Character
Register Data
Segments
D6:D4
decimal point enabled setting
Table No-Decode Mode Data Bits Corresponding Segment Lines Corresponding Segment Line
6.4.3 Display-Test Register (0xXF)
AS1108 operate modes: normal mode display test mode. display test mode LEDs switched maximum brightness (duty cycle 15/16). device remains display-test mode until DisplayTest Register normal operation. Note: settings Digit- Control-Registers maintained. Table Display-Test Register Format (Address (HEX) 0xXF)) Mode Normal Operation Display Test Mode Register Data
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AS1108 Data Sheet
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Digit- Control-Registers
6.4.4 Intensity Control Register (0xXA)
brightness display controlled digital means using Intensity Control Register analog means using RSET (see Section page 10). Display brightness controlled integrated pulse-width modulator which controlled lower-nibble Intensity Control Register. modulator scales average segment-current steps from maximum 31/32 down 1/32 peak current RSET. Table Intensity Register Format (Address (HEX) 0xXA)) Duty Cycle AS1108 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 Register Data
6.4.5 Scan-Limit Register (0x0B)
Scan-Limit Register controls which digits displayed. When digits displayed, update frequency typically 1600Hz. number digits displayed reduced, update frequency increased. frequency calculated using 8fOSC/N, where number digits. Since number displayed digits influences brightness, RSET should adjusted accordingly. Table lists maximum allowed current when fewer than digits used. Note: avoid differences brightness this register should used blank parts display (leading zeros). Table Scan-Limit Register Format (Address (HEX) 0xXB)) Scan Limit Display digit only (see Table Display digits (see Table Display digits (see Table Display digits Code 0xX0 0xX1 0xX2 0xX3 Register Data
Table Maximum Segment Current 3-Digit Displays Number Digits Displayed Maximum Segment Current (mA)
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AS1108 Data Sheet
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Digit- Control-Registers
6.4.6 Feature Register (0xXE)
Feature Register used switching device into external clock mode, applying external reset, selecting code-B decoding, enabling disabling blinking, enabling disabling SPI-compatible interface, setting blinking rate, resetting blink timing. Note: power-up Feature Register initialized Table Feature Register Summary blink_ start sync blink_ freq_sel blink_en spi_en decode_sel reg_res clk_en
Table Feature Register Descriptions (Address (HEX) 0xXE)) Addr: 0xXE Feature Register Enables disables various device features. Name Default Access Description External clock active. clk_en Internal oscillator used system clock. serial interface operates system clock input. Resets control registers except Feature Register. Reset Disabled. Normal operation. reg_res control registers reset default state (except Feature Register) identically after power-up. Note: Digit Registers maintain their data. Selects display decoding. Enable Code-B decoding (see Table page decode_sel Enable decoding (see Table page Enables SPI-compatible interface. spi_en Disable SPI-compatible interface. Enable SPI-compatible interface. Enables blinking. blink_en Disable blinking. Enable blinking. Sets blink with frequency (with internal oscillator enabled): Blink period typically second (0.5s 0.5s off). blink_freq_sel Blink period seconds off). Synchronizes blinking rising edge LOAD/CSM. multiplex blink timing counter cleared rising edge sync LOAD/CSM. setting this multiple AS1108 devices, blink timing synchronized across devices. Start Blinking with display enabled phase. When (blink_en) set, determines blinking starts. blink_start Blinking starts with display turned off. Blinking starts with display turned
6.4.7 No-Op Register (0xX0)
No-Op Register used when multiple AS1108 devices cascaded order support displays with more than digits. cascading must done such that DOUT pins connected next AS1108 (see Figure page 11). LOAD/CSM signals connected devices. example, five devices cascaded, order perform write operation fifth device, write-command must followed four no-operation commands. When LOAD/CSM signal goes high, shift registers latched. first four devices will receive no-operation commands only fifth device will receive intended operation command, subsequently update register.
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AS1108 Data Sheet
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Supply Bypassing Wiring
Typical Application
Supply Bypassing Wiring
order achieve optimal performance AS1108 should placed very close display minimize effects electromagnetic interference wiring inductance. Furthermore, recommended connect 10µF electrolytic 0.1µF ceramic capacitor between pins avoid power supply ripple (see Figure page 11). Note: Both pins must connected ground.
Selecting RSET Resistor Value Using External Drivers
Brightness display segments controlled RSET. current that flows between ISET defines current that flows through LEDs. Segment current about times current ISET. Typical values RSET different segment currents, operating voltages, voltage drop (VLED) given Table maximum current AS1108 drive 40mA. higher currents needed, external drivers must used, which case longer necessary that device drive high currents. cases where device drives only digits, Table specifies maximum currents, RSET must accordingly. Note: display brightness also logically controlled (see Section page 10). Table RSET Segment Current Forward Voltage ISEG (mA) VLED 2.7V 5.1k 6.9k 10.5k 21.3k 4.6k 6.5k 10.1k 20.5k VLED 3.3V 6.6k 9.0k 13.6k 28.0k 6.4k 8.7k 13.2k 27.0k 6.1k 8.3k 12.8k 25.9k 7.4k 15.3k 31.0k VLED 3.6V 7.2k 9.7k 14.7k 30.2k 6.9k 9.4k 14.2k 29.2k 5.8k 8.5k 13.5k 27.9k
Table Package Thermal Data Package 20-pin Narrow 20-pin Wide SOIC Thermal Resistance (JA)
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AS1108 Data Sheet
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Matrix Driver
Matrix Driver
application example Figure shows AS1108 matrix driver. columns have common cathodes connected DIG0:3 outputs. rows connected segment drivers. Each LEDs addressed separately. columns selected digits listed Table page Decode Enable Register (see page must `00000000' described Table page Single LEDs column addressed described Table page where corresponds segment corresponds segment Note: multiple-digit matrix, multiple AS1108 devices must cascaded. Figure Application Example Matrix Driver
Matrix Diode Arrangement Matrix
DIG0:3 DOUT MicroProcessor LOAD/CSM ISET VBAT 5.62k
DIG0:3
LOAD/CSM
VBAT 5.62k
ISET
Cascading Drivers
more than digits LEDs needed, recommended AS1106/AS1107, although several AS1108 devices cascaded. example Figure drives matrix digits using 4-wire microprocessor interface. Scan-Limit Registers should same value that display will appear brighter than other. example, display digits, both Scan-Limit Registers display digits that both displays have duty cycle digit. digits needed, both Scan-Limit Registers display digits leave digit unconnected. Otherwise, driver display digits other display digits display will appear brighter because duty cycle digit will other display's duty cycle will 1/3. Note: Refer Section 6.4.7 No-Op Register (0xX0) page additional information.
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AS1108 Data Sheet
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Assignments
Pinout Packaging
Assignments
Figure AS1108 Assignments (Top View)
DOUT
LOAD/CSM
AS1108
ISET
Descriptions
Table AS1108 Descriptions Name DOUT 0:DIG Number Description
LOAD/CSM
A:SEG ISET
Serial-Data Output. data into valid DOUT 16.5 clock cycles later. This used daisy-chain several AS1108 devices never high-impedance. Serial-Data Input. Data loaded into internal 16-bit shift register rising edge CLK. Digit Drive Lines. four-digit drive lines that sink current from display common cathode. AS1108 pulls digit outputs when turned off. Ground. Both pins must connected. Load-Data Input. last bits serial data latched rising edge this pin. Chip-Select Input (AS1108 SPI-enabled only). Serial data loaded into shift register while this low. last bits serial data latched rising edge this pin. Serial-Clock Input. 10MHz maximum rate. Data shifted into internal shift register rising edge this pin. Data clocked DOUT falling edge this pin. AS1108 SPI-enabled, input active only while LOAD/CSM low. Seven Segment Decimal Point Drive Lines. seven-segment drives decimal point drive that source current display. When segment driver turned pulled GND. Connect through RSET peak segment current (see Section page 10). Positive Supply Voltage. Connect +2.7 +3.6V supply.
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AS1108 Data Sheet
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Package Drawings Markings
Package Drawings Markings
AS1108 available 20-pin 20-pin SOIC package. Figure 20-pin Package
Symbol
Inches .015 .115 0.15 0.14 0.55 .008 .008 1.025 .030 .300 .240 .252 .100 .300 .430 .000 .125 .055 .060 .065 .060 .135 .130 0.18 0.18 0.60 .010 .010 1.030 .035 .195 0.22 0.20 0.65 .012 .011 1.035 .040 .325 .260 .210
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AS1108 Data Sheet
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Package Drawings Markings
Figure 20-pin SOIC Package
Symbol
Millimeters
2.44 0.10 2.24 0.36 0.23 10.11 0.31 0.53 0.51 0.63 1.01 0.89
2.84 0.30 2.44 0.46 0.32 10.51 0.71 0.73
1.27
0.66
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AS1108 Data Sheet
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Ordering Information
AS1108 available 20-pin 20-pin SOIC package. Part AS1108PL AS1108WL AS1108PL-T AS1108WL-T Temperature Range Delivery Form Tubes Tubes Tape Reel Tape Reel Package 20-pin Narrow Plastic DIP, Pb-free 20-pin Wide Pb-free 20-pin Narrow Plastic DIP, Pb-free 20-pin Wide Pb-free
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AS1108 Data Sheet
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Copyrights
Copyright 1997-2005, 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 lifesustaining equipment specifically recommended without additional processing austriamicrosystems each application. 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 e-mail: info@austriamicrosystems.com Sales Offices, Distributors Representatives, please visit:
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