16-Channel Driver with Correction Greyscale General Description

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16-Channel Driver with Correction Greyscale General Description

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AS1112
16-Channel Driver with Correction Greyscale
General Description
AS1112 16-channel, constant current-sink driver. Each channels individually adjusted 4096-step greyscale brightness control 64-step constant-current sink (dot correction). correction circuitry adjusts brightness variations between AS1112 channels other drivers. Greyscale control correction circuitry accessible SPI-compatible serial interface. single external resistor sets maximum current value channels. open short detection function indicates broken, shorted disconnected more outputs. overtemperature flag indicates that device overtemperature condition. Table Standard Products Model AS1112 AS1112B Power-Down TEST Connect Connect
Features
Channels Greyscale Control: 12-Bit (4096 Steps) Correction: 6-Bit Steps) Drive Capability (Constant-Current Sink): 80mA Power Supply Voltage: Supply Voltage Range: SPI-Compatible Serial Interface Controlled In-Rush Current Data Transfer Clock Rate: CMOS Level Diagnostic Features Open/Short Detection Overtemperature Flag 32-pin TQFN Package
additional power-down puts AS1112 into 40nA standby-mode. AS1112 available 32-pin TQFN package. Figure Block Diagram
IREF GSCLK Status Open Detect, Overtemperature Flag, Correction Data
MODE
Applications
device ideal mono-, multi-, full-color displays, signboards, display backlights.
Control Greyscale Register 12-Bit Greyscale Control 6-Bit Correction Constant Current Driver Delay OUT0
OUTn Current
VREF 1.24V
Greyscale Counter
Control Input Shift Register
Correction Register
Open&Short Detection Control Greyscale Register Correction Register 12-Bit Greyscale Control 6-Bit Correction Constant Current Driver Delay OUT1
Constant Current Driver Delay OUT15
Thermal Flag Open Detect
Open&Short Detection Control 12-Bit Greyscale Control 6-Bit Correction
Input Shift Register Greyscale Register191 Correction Register
XERR
Open&Short Detection
AS1112
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Pinout
Assignments
Figure Assignments (Top View)
XTEST TEST IREF IREF
MODE OUT0 OUT1 OUT2 OUT3 OUT4
OUT6 OUT8 OUT7 OUT5
GSCLK XERR OUT15 OUT14 OUT13 OUT9 OUT10 OUT12 OUT11
MODE OUT0 OUT1 OUT2 OUT3 OUT4
OUT6 OUT8 OUT7 OUT9 OUT10
GSCLK XERR OUT15 OUT14 OUT13 OUT12 OUT11
AS1112
Thermal
AS1112B
Thermal
OUT5
Descriptions
Table Descriptions Number 4:11 14:21 12,13,28 Serial Data Shift Clock Serial Data Input Mode Select input with internal pulldown MODE GND: Selects greyscale mode (see Setting Greyscale Brightness page 12). MODE MODE VCC: Selects correction mode (see Setting Correction page 11). OUT0:OUT7 Constant-Current Outputs OUT8:OUT15 Constant-Current Outputs 8:15 Error Output open detection overtemperature condition detected. XERR Normal operation. Serial Data Output Greyscale Clock. Reference clock greyscale control GSCLK Test This must connected (AS1112) ensure normal operation. TEST Test This must connected (AS1112B) ensure normal operation. XTEST Reference Current Terminal IREF Power Supply Voltage This must connected. Power Down input with internal pulldown (AS1112) normal operation mode powerdown mode Connected (AS1112B) Ground Blank Outputs OUTn outputs controlled greyscale control. OUTn outputs forced off; greyscale counter reset. Data Latch. internal connections switched MODE. (MODE GND), greyscale register receives data. (MODE VCC), correction register receives data. Thermal Thermal Pad. This must connected ensure normal operation. Revision 1.05 Name Description
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AS1112
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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 Recommended Operating Conditions page implied. Exposure absolute maximum rating conditions extended periods affect device reliability. Table Absolute Maximum Ratings Parameter Input Voltage Range Output Current (DC) Input Voltage Range Output Voltage Range VSDO, VXERR Output Voltage Range VOUT0: VOUT15 Rating Storage Temperature Range Operating Ambient Temperature Range 32-pin TQFN Package Thermal Impedance -0.3 -0.3 -0.3 +150 Units 4-Layer reflow peak soldering temperature (body temperature) specified accordance with IPC/JEDEC J-STD-020C "Moisture/Reflow Sensitivity Classification Non-Hermetic Solid State Surface Mount Devices". lead finish Pb-free leaded packages matte (100% Sn). JEDEC 22-A114 Human Body Model Comments
Package Body Temperature
+260
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Recommended Operating Conditions
Table Characteristics Symbol VOUT ICOC Parameter Supply Voltage Voltage Applied Output (OUT0:OUT15) High-Level Input Voltage Low-Level Input Voltage High-Level Output Current Low-Level Output Current Constant Output Current SDO, XERR OUT0:OUT15 Conditions Unit
Table Characteristics TAMB 85°C (unless otherwise noted) Symbol fCLK fGSCLK tWH0/tWL0 tWH1/tWL1 tWH2 tWH3 tSU0 tSU1 tSU2 tSU3 tSU4 Figure page Figure page Figure page Figure page Hold Time Setup Time Parameter Data Shift Clock Frequency Greyscale Clock Frequency Pulse Duration GSCLK Pulse Duration Pulse Duration Pulse Duration Conditions GSCLK
Unit
GSCLK
SDI, CLK,
MODE, MODE,
OEN, GSCLK CLK,
CLK, MODE MODE
OEN, GSCLK
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Electrical Characteristics
+3.0 +5.5V, TAMB Typical values TAMB 25°C, (unless otherwise specified). Table Electrical Characteristics Symbol Parameter High-Level Output Voltage Low-Level Output Voltage Condition -1mA, 1mA, SDO, XERR GND; Pins OEN, TEST, GSCLK, CLK, SDI, Input Current VCC; MODE, GND; MODE, outputs off, RIREF Supply Current outputs off, RIREF 1.3k outputs RIREF 1.3k outputs RIREF ICOC ILEAK Power Down Current Constant Output Current Leakage Output Current outputs VOUT RIREF outputs off, VOUT 15V, RIREF 640, OUT0:OUT15 VOUT RIREF 640, OUT0:OUT15 VOUT RIREF 480, OUT0:OUT15 ICOC Constant Current Error Device device, average current from OUT0:OUT15, RIREF 1920 Device device, average current from OUT0:OUT15, RIREF ILNR VOUT RIREF OUT0:OUT15 VOUT RIREF OUT0:OUT15 VOUT RIREF 640, OUT0:OUT15 VOUT RIREF 480, OUT0:OUT15 Junction temperature Junction temperature
Unit
±4.5 ±4.5 ±4.5
±0.1 ±0.1
±4.5 ±2.5 ±2.5 ±0.5 ±0.5 1.28
Line Regulation
ILDR
Load Regulation
TTEF TTWF VLSD VLOD VIREF
Thermal Error Flag Threshold Thermal Warn Flag Threshold Short Detection Threshold Open Detection Threshold Reference Voltage Output
RIREF
1.20
1.24
Specified design. tested.
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Switching Characteristics
+3.0 +5.5V, TAMB Typical values TAMB 25°C, (unless otherwise specified). Table Switching Characteristics Symbol tPD0 tPD1 Propagation Delay Time tPD2 tPD3 Average Output Delay Time Fall Time Rise Time Parameter Conditions OUTn, 3FHEX SOUT OUTn, 3FHEX CLK,
Unit
OEN, OUT0
OUTn, XERR (includes error detection time, Figure page GSCLK, OUT0 OUTn, OUTn+1
1000
Figure page Figure page
Dissipation Ratings
Table Dissipation Ratings Package Type 32-pin TQFN Power Rating (TAMB 5433mW Derating Factor above Power Rating (TAMB 3477mW Power Rating (TAMB 2825mW
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Typical Operating Characteristics
TAMB Figure Output Current VDS;
RIREF
Figure Output Current VDS;
RIREF
IOUT (mA)
IOUT (mA)
RIREF
RIREF 3.9k RIREF
RIREF 3.9k
Figure Output Current REXT
Figure Output Current Correction Value
RIREF
IOUT (mA)
IOUT (mA)
RIREF
REXT (kOhm)
Correction Value
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Detailed Description
Serial Interface
AS1112 features versatile 3-pin (CLK, SDI, SDO) serial interface, which connected microcontrollers digital signal processors various configurations. rising edge signal shifts data from internal register. After data clocked serial data latched into internal registers rising edge signal. Note: data clocked with first. Multiple AS1112 devices cascaded connecting device with next device (see Figure page 15). also connected microcontroller receive status information from AS1112. serial data format 96-bit 192-bit wide, depending mode device (see page Figure Serial Data Input Timing Diagram
Correction Mode Data Input Cycle MODE tSU3 Greyscale Mode Data Input Cycle Correction Mode Data Input Cycle
DCn-1
tSU2
DCn+1 tSU2
DCn-1 MSB-1
DCn-1
DCn-1 MSB-1
DCn-1
Error Information Output
open-drain output XERR indicates device error conditions: overtemperature flag open detect. During normal operation, internal transistor connected XERR turned voltage XERR pulled through external pullup resistor. overtemperature open condition detected, internal transistor switched XERR pulled GND. Because XERR open-drain output, multiple AS1112 devices ORed together pulled with single pullup resistor (see Figure page 15). This reduces number signals needed report system error. differentiate overtemperature flag from open detect flag from XERR, open detect flag masked setting (see Table
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Table XERR Truth Table Error Condition Temp. TTEF Thermal OUTn Voltage Error Flag OUTn VLOD OUTn VLOD OUTn VLOD TTEF TTEF TTEF TTWF TTWF OUTn VLOD Don't Care Don't Care Don't Care Don't Care Don't Care Don't Care Error Information Thermal Warning Open Detect Flag Don't Care Don't Care Don't Care Don't Care Selected Mode Short Detect Don't Care Don't Care Don't Care Don't Care Mode XERR normal open error temp. error open temp. error normal temp error normal temp. warn Status
Don't Care Don't Care Don't Care Don't Care Don't Care Don't Care Don't Care Don't Care Don't Care Don't Care
Overtemperature Error/Warning Flags
AS1112 provides overtemperature circuit indicate that device overtemperature condition. device junction temperature (TJ) exceeds threshold temperature (150°C typ), overtemperature circuit trips pulls XERR ground. overtemperature flag status read from AS1112 status register. prevent overtemperature condition AS1112 offers temperature warning flag 125°C typical. This flag used take precautions (e.g. start external cooling) against overtemperature condition.
Open Detection
AS1112 integrated open detection circuit reports error LEDs open disconnected from circuit. open detection circuit trips when error detection activated (see Table voltage OUTn less than VLOD. Note: voltage each OUTn sampled after being switched Please refer Figure open detection circuit also pulls XERR when tripped. open status each channel also read from AS1112 status information data (SID) during greyscale data input cycle.
Shorted Detection
AS1112 integrated shorted detection circuit detects LEDs short-circuited. shorted detection circuit trips when error detection activated voltage OUTn higher than VLSD. Note: voltage each OUTn sampled after being switched Please refer Figure shorted status each channel only read from AS1112 status information data (SID) during greyscale data input cycle.
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Figure Error Detection Timing (GS=FFFFHEX, DC=3FHEX)
>1µs
GSCLK
Error Detection Start
LODn, LSDn
LODn+1, LSDn+1 Error Detection
Note: rising edge latches data into internal registers depending logic level MODE. MODE tied GND, greyscale registers updated. MODE tied VCC, correction registers updated.
Delay Between Outputs
AS1112 uses graduated delay circuits between OUTn outputs. These circuits contained constant-current driver block AS1112 (see Figure page average-delay time 30ns (typ). maximum delay 450ns (typ) from OUT0 OUT15. delay scheme works switching switching each output channel. Thus on/off time each channel same regardless delay. These delays prevent large inrush currents switching noise that reduce bypass capacitance when outputs switched
OUTn Enable
OUTn channels collectively switched with signal. When OUTn channels disabled, regardless device logic operations. greyscale counter also reset when When OUTn channels normal operation. Table Truth Table OUT0:OUT15 Normal Operation Disabled
Setting Maximum Channel Current
maximum output current channel programmed single resistor, RIREF, which placed between IREF GND. voltage IREF internal band VIREF (1.24V typ). maximum channel current equivalent current flowing through RIREF multiplied factor 31.5. maximum output current calculated IMAX VIREF RIREF Where: VIREF 1.24V; RIREF User-selected external resistor. Figure page shows maximum output current IOUT versus RIREF, where RIREF value resistor between IREF terminal GND, IOUT constant output current OUT0:OUT15. 31.5
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Power Dissipation
ensure proper operation device, total power dissipation AS1112 must below power dissipation rating device package. Total power dissipation calculated (VCC ICC) (VOUT IMAX dPWM)
Where: device supply voltage; device supply current; VOUT device OUTn voltage when driving current; IMAX current adjusted RIREF; maximum correction value OUTn; number OUTn driving same time; dPWM duty cycle defined greyscale value.
Operating Modes
AS1112 operates modes (see Table 11). Greyscale operating mode (see Figure page shift registers reset state power-up. Table Operating Modes Mode Input Shift Register 192-bit 96-bit Operating Mode Greyscale Mode Correction Data Input Mode
Setting Correction
AS1112 perform independent fine-adjustments output current each channel, i.e., correction. correction used adjust brightness deviations LEDs connected output channels (OUT0:OUT15). device powers with following default seetings: 4095. channels individually programmed with 6-bit word. channel output adjusted steps from 100% maximum output current (IMAX). output current each OUTn channel calculated IOUTn IMAX Where: IMAX maximum programmable output current each output; programmed correction value output (DCn 63); correction data simultaneously entered channels. complete correction data format consists 6-bit words, which forms 96-bit serial data packet (see Figure Channel data one, data clocked with first. Figure Correction Data Packet Format
DC15.5 OUT15 DC15.0 DC14.5 OUT14:DC OUT1 DC1.0 DC0.5 OUT0
DC0.0
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Figure Correction Data Input Timing Diagram
Correction Mode Data Input Cycle MODE
Correction Mode Data Input Cycle
DCn-1
tSU0
MSB-1 tWH0
MSB-2
LSB+1
DCn+1
DCn+1 MSB-1
tWL0
DCn-1
DCn-1 MSB-1
DCn-1 MSB-2
DCn-1 LSB+1
DCn-1 tSU1
tWH2
MSB-1
MSB-2
Setting Greyscale Brightness
brightness each channel output adjusted using bits-per-channel control scheme which results 4096 brightness steps, from 100% brightness. brightness level each output calculated %Brightness 4095
Where: programmed greyscale value OUTn (GSn 4095); greyscale data outputs. device powers with following default seetings: 4095 input shift register shifts greyscale data into greyscale register channels simultaneously. complete greyscale data format consists words, which forms 192-bit wide data packet (see Figure 11). Note: data packet must clocked with first. Figure Greyscale Data Packet Format
GS15.11 OUT15 GS15.0 GS14.11 OUT14:GS OUT1 GS1.0 GS0.11 OUT0 GS0.0
When MODE tied GND, AS1112 enters greyscale data input mode. device switches input shift register 192-bit width. After data clocked rising edge signal latches data into greyscale register (see Figure 12). greyscale data input shift register replaced with status information data (SID) after latching into greyscale register.
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Figure Greyscale Data Input Timing Diagram
Correction Mode Data Input Cycle Greyscale Mode Data Input Cycle After Correction Input Following Greyscale Mode Data Input Cycle
MODE
tSU3 DCn-1 tSU2 tSU1 GSn+1 GSn+1
DCn-1 MSB-1
DCn-1
SIDn
SIDn MSB-1
SIDn MSB-2
SIDn
SIDn
Status Information Data (SID)
AS1112 contains integrated status information register, which accessed greyscale mode (MODE GND). Once signal latches data into greyscale register, input shift register data replaced with status information data (see Figure 13). Open, shorted LED, temperature warning overtemperature flags well dot-correction registers read SDO. status information data packet bits wide. Bits 191:176 31:16 contain open detection status each channel (either 191:176 31:16 used readout). contains thermal error flag status. contains temperature warning flag. Bits 167:72 contain data dot-correction register. 15:0 contains shorted flags. remaining bits reserved. complete status information data packet shown Figure Figure Status Information Data Packet Format
LOD15 Open Detect LOD0 DC15. Values DC0. 16:31 0:15
Overtemperature
0:15 16:31 32:71 72:167
Description Short Detection, Open Detection (Optional, same bits 176:191), Undefined Correction Readback Bit)
Description 168:173 Undefined Temperature Warning Flag (TWF, typ) Temperature Error Flag (TEF, typ) 176:191 Open Detection,
Greyscale Operation
falling edge signal initiates greyscale cycle. first GSCLK pulse after falling edge increments greyscale counter switches OUTn whose greyscale value does equal zero. Each subsequent rising edge GSCLK increments greyscale counter one. AS1112 compares greyscale value each OUTn channel with greyscale counter value. OUTn whose greyscale values equal counter values switched off. signal after 4096 GSCLK pulses resets greyscale counter zero completes greyscale cycle (see Figure 14).
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Figure Greyscale Cycle Timing Diagram
Greyscale Cycle tWH1 GSCLK tPD1 OUT0 Current tPD1 OUT1 Current tPD1 OUT15 Current tPD2 XERR tPD3 tPD3 tWL1 tWH3
4096
Greyscale Cycle tSU4
tPD3
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Serial Data Transfer Rate
Figure shows cascaded arrangement AS1112 devices connected controller, building basic module display system. Figure Cascaded Configuration
VLED OUT0 XERR XERR GSCLK GSCLK MODE MODE SOUT Controller IREF IREF MODE XERR GSCLK OUT15 OUT0 VLED VLED OUT15 VLED
100k
AS1112
100nF TEST
AS1112
100nF TEST
maximum number cascading AS1112 devices depends application system range devices. minimum frequency needed calculated following equations: fGSCLK 4096 fUPDATE Where: fGSCLK minimum frequency needed GSCLK; fUPDATE update rate whole cascaded system. fCLK fUPDATE Where: fCLK minimum frequency needed SIN; fUPDATE update rate whole cascaded system; number cascaded AS1112 devices.
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Package Drawings Markings
device available 32-pin TQFN package. Figure 32-pin TQFN Package
Symbol Notes:
0.80
Common Dimensions Symbol 1.00 0.203 0.23 5.00 5.00 3.60 3.60 0.30 3.70 3.70
0.40 0.15 0.10
0.30
0.50 0.10
0.18
3.50 3.50
Dimensioning tolerancing conform ASME Y14.5 M-194. dimensions millimeters while angle degrees. Dimension applies metallized terminal measured between 0.25mm 0.30mm from terminal tip. Dimension represents terminal full back from package edge 0.1mm acceptable. Coplanarity applies exposed heat slug well terminal Radius terminal optional.
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Ordering Information
device available standard products shown Table Table Ordering Information Model AS1112-BQFT Description 16-Channel Driver with Correction Greyscale with Active-High TEST Input Power-Down Mode Delivery Form Tape Reel Tape Reel Package 32-pin TQFN 32-pin TQFN
Correction AS1112B-BQFT 16-Channel Driver with Dotand without Greyscale with Active-Low XTEST Input Power-Down Mode devices RoHS compliant free halogene substances.
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Copyrights
Copyright 1997-2009, 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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16-Channel Driver with Correction Greyscale General Description

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