AS1122 AMSCO
Document overview
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- PDF pages: 23
Technical content
The technical content of this austriamicrosystems datasheet is still valid. Contact information: Headquarters: ams AG Tobelbaderstrasse 30
8141 Unterpremstaetten, Austria
Tel: +43 (0) 3136 500 0 e-Mail: ams_sales@ams.com Please visit our website at www.ams.com
1 General Description
cates that the device is in an overtemperature condition. The AS1122 is available in a 24Wpin QFN 4x4mm package. Figure 1. AS1122 - Typical Application Diagram
2 Key Features
3 Applications
ED signboards, and display backlights.
4 Pinout
Figure 2. Pin Assignments (Top View)
1 SDI Serial Data Input
2 CLKI Serial Data Clock Input
5 CLKO Serial Data Clock Output
6 SDO Serial Data Output
13 VDD Power Supply Voltage
14 IRQ Interrupt Request Output. Open drain pin, can be left open if not used. shutdown. Connect this pin to GND for normal operation. tting Maximum Channel Current on page 15) . 3, 4, 17 NC Not Connected. Connect to GND if not used. 25 Thermal Pad Ground. This pin must be connected to GND to ensure normal operation.
www.austriamicrosystems.com/LEDWDriverWICs Revision 1.00 3 W 22 AS1122 Datasheet W A b s o l u t e M a x i m u m R a t i n g s
5 Absolute Maximum Ratings
Stresses beyond those listed in T able 2 may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in Electrical Characteristics on page 4 is not implied. Exposure to absolute ma ximum rating conditions for extended periods may affect device reliability. T able 2. Absolute Maximum Ratings Parameter Min Max Units Comments Electrical Parameters VCC to GND W0.3 5 V All other pins to GND W0.3 V DD + 0.3 V V SDO to GND W0.3 V DD + 0.3 V V OUT0 : VOUT11 to GND W0.3 30 V Output Current 50 mA Input Current (latchWup immunity) W100 100 mA Norm: JEDEC 78 Electrostatic Discharge Electrostatic Discharge HBM +/W 2 kV Norm: MIL 883 E method 3015 Thermal Information Junction to ambient thermal resistance 37 °C/W For more information about thermal metrics, see application note AN01 Thermal Characteristics. Temperature Ranges and Storage Conditions Junction T emperature +150 ºC Storage T emperature Range W55 +150 ºC Package Body T emperature +260 ºC The reflow peak soldering temperature (body temperature) specified is in accordance with IPC/JEDEC J-STD- 020“Moisture/Reflow Sensitivity Classification for Non- Hermetic Solid State Surface Mount Devices”. The lead finish for PbWfree leaded packages is matte tin (100% Sn). Humidity nonWcondensing 5 85 % Moisture Sensitive Level 3 Represents a max. floor life time of 168h ams AG Technical content still valid
www.austriamicrosystems.com/LEDWDriverWICs Revision 1.00 4 W 22 AS1122 Datasheet W E l e c t r i c a l C h a r a c t e r i s t i c s
6 Electrical Characteristics
w ith min and max values are guaranteed with production tests or SQC (Statistical Quality Control) methods. T able 3. Electrical Characteristics Symbol Parameter Condition Min Typ Max Unit TAMB Operating T emperature Range W 40 +85 °C TJ O perating Junction T emperature W40 +125 °C Input Supply VDD S upply Voltage 2.7 3.6 V ICC Supply Current A ll outputs on, RIREF = 1kΩ 9 .5 12 mA All outputs on, RIREF = 10kΩ 4 6 IPD Power Down Current R ST = High, TAMB = +25°C 4 0 nA Output RIREF Reference Current Resistor 1 10 k Ω VOUT V oltage Applied to Output (OUT0:OUT11) 30 V ICOC Constant Output Current A ll outputs on, VOUT = 1V, RIREF = 1kΩ 3 8 40 42 mA ΔICOC Constant Output Current Error VOUT = 1V, RIREF = 1kΩ , OUT0:OUT11 ±0.8 2 VOUT = 1V, RIREF = 10kΩ , OUT0:OUT11 ±1.5 4 Device to device, average current from OUT0:OUT11, VOUT = 1V, RIREF = 1kΩ ± 0.5 Device to device, average current from OUT0:OUT11, VOUT = 1V, RIREF = 10kΩ ±0.6 ILEAK Leakage Output Current A ll outputs off, VOUT = 30V, RIREF = 1kΩ , OUT0:OUT11 20 nA ΔILNR Line Regulation VOUT = 1V, RIREF = 1kΩ OUT0:OUT11 ±0.1 ±1.5 %/V VOUT = 1V, RIREF = 10kΩ OUT0:OUT11 ±0.2 ±1.5 ΔILDR Load Regulation VOUT = 1V to 4V, RIREF = 1kΩ , OUT0:OUT11 ±0.1 ±0.4 %/V VOUT = 1V to 4V, RIREF = 10kΩ , OUT0:OUT11 ±0.01 ±0.4 Logic Levels VIH HighWLevel Input Voltage 0 .8 x VDD VDD V VIL LowWLevel Input Voltage G ND 0.2 x VDD V VOH HighWLevel Output Voltage IOH = W1mA, SDO, CLKO VDD W0.5 V VOL LowWLevel Output Voltage IOL = 1mA, SDO, CLKO 0 .5 V IOL = 3mA, IRQ 0 .5 V VLOD LED Open Detection Threshold 0 .3 0.4 V VIREF Reference Voltage Output RIREF = 1kΩ 1 .24 1.27 1.30 V ams AG Technical content still valid
C. Typical values are at T AMB = +25°C, VDD = 3.3V (unless otherwise specified). Figure 3. Load Circuit for Digital Output Timing Specifications
- Value can be factory trimmed for EMI improvement.
- See Figure 24 on page 10 .
- See Figure 36 on page 16 and Figure 37 on page 16
- Guaranteed by design and not production tested.
7 Typical Operating Characteristics
Figure 6. Constant Output Current vs. V OUT ; REXT = 1kΩ Figure 7. Constant Output Current vs. V OUT ; REXT = 1kΩ Figure 8. ICOC vs. Supply Voltage; R EXT = 1kΩ Figure 9. ICOC vs. Supply Voltage; R EXT = 10kΩ
Figure 22. LED Open Detection Threshold vs. T emperature F igure 23. ΔICOC Matching vs. Dot Correction; R EXT = 1kΩ
8 Detailed Description
but the data will be ignored. With the falling edge of the CLKO the data is shifted to SDO. Figure 24. PWM Cycle Timing Diagram
For n devices in a chain only one identifier needs to be send to set all n devices to the same register setting. ions of LEDs connected to the output channels (OUT0:OUT11). The device powers up with the following default settings: DC = 0 and GS = 0. Figure 31. Dot Correction Data Packet Format The Dot Correction data is only valid if the exact identifier byte was send. Otherwise the data will be ignored. n = 0 to 11 greyscale data for all outputs. The device powers up with the following default settings: GS = 0 and DC = 0.
www.austriamicrosystems.com/LEDWDriverWICs Revision 1.00 14 W 22 AS1122 Datasheet W D e t a i l e d D e s c r i p t i o n The input shift register shifts greyscale data into the greyscale register for all channels simultaneously. The complete greyscale data format conW s ists of 12 x 12 bit words, which forms a 144Wbit wide data packet (see Figure 32) plus the 8Wbit for the identifier. Fi gure 32. PWM Data Packet Format The PWM data is only valid if the exact identifier byte was send. Otherwise the data will be ignored. Command Data In the command register of the AS1122 some configuration of the device can be done. After sending the correct identifier the 8 bits of the comW m and register are accessible. The complete status information data packet is shown in Figure 33. F i gure 33. Command Packet Format T able 7. Command Register Format Bit Bit Name Default Access Bit Description 7:5 W 000 n/a
4 Read SID 0 W 0: normal operation
1: read Status Information Register (SID)
3 OPEN T est 0 W 0: no test is running
1: start OPEN test
2 Over T emperature
0: If an overtemperature condition occurs the OUTn are NOT switched off automatically. 1: If an overtemperature condition occurs the OUTN are switched off automatically.
1 Display One Time 0 W 0: The PWM is running endless
1: The PWM is running for one cycle
0 OEN
0: This bit must be ‘0’ as well as bit3 of the last valid identifier to turn ON all channels. 1: all channels are OFF ams AG Technical content still valid
ata is replaced with status information data. can be read out at pin SDO. The status information data packet is 16 bits wide. Bits 11:0 contain the open LED detection status of each channel. status information data packet is shown in Figure 34. Note: Bit14 (POR) is set to ‘1’ after startWup and after triggering a powerWon reset due to a supply voltage drop. Must be set to ‘0’ manually. is reset again and can be programmed with need information. Figure 35. Reading of the Status Information Register RIREF = UserWselected external resistor.
ause less error as the classical PWM when data is updated during a running PWM cycle. to 6. In the classical approach the red, green and blue channels are high according to their PWM setting (see Figure 38). LED also would be much brighter than desired. Figure 38. Classic PWM vs. scrambled PWM
9 Package Drawings and Markings
Figure 40. 24-pin QFN 4x4mm Marking
Figure 41. 24-pin QFN 4x4mm Package
www.austriamicrosystems.com/LEDWDriverWICs Revision 1.00 21 W 22 AS1122 Datasheet W O r d e r i n g I n f o r m a t i o n The device is available as the standard products shown in T able 9. on request Note: All products are RoHS compliant and austriamicrosystems green. Buy our products or get free samples online at ICdirect: http://www.austriamicrosystems.com/ICdirect T echnical Support is found at http://www.austriamicrosystems.com/T echnicalWSupport For further information and requests, please contact us mailto:sales@austriamicrosystems.com or find your local distributor at http://www.austriamicrosystems.com/distributor T able 9. Ordering Information Ordering Code Marking Description Delivery Form Package AS1122WBQFT AS1122 12WChannel LED Driver with Dot Correction and Greyscale PWM T ape and Reel 24Wpin QFN 4x4mm AS1122BWBQFT* AS1122B 12WChannel LED Driver with Dot Correction and Greyscale PWM without Output Delay T ape and Reel 24Wpin QFN 4x4mm ams AG Technical content still valid
www.austriamicrosystems.com/LEDWDriverWICs Revision 1.00 2 2 W 22 AS1122 Datasheet Copyrights Copyright © 1997W2012, austriamicrosystems AG, T obelbaderstrasse 30, 8141 Unterpremstaetten, AustriaWEurope. Trademarks Registered ®. All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. All products and companies mentioned are trademarks or registered trademarks of their respective companies. Disclaimer Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing in its T erm of Sale. austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. austriamicrosystems AG reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with austriamicrosystems AG for current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical lifeWsupport or lifeWsustaining equipment are specifically not recommended without additional processing by austriamicrosystems AG for each application. For shipments of less than 100 parts the manufacturing flow might show deviations from the standard production flow, such as test flow or test location. The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However, austriamicrosystems AG shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of austriamicrosystems AG rendering of technical or other services. Contact Information Headquarters austriamicrosystems AG T obelbaderstrasse 30 AW8141 Unterpremstaetten, Austria T el: +43 (0) 3136 500 0 Fax: +43 (0) 3136 525 01 For Sales Offices, Distributors and Representatives, please visit: http://www.austriamicrosystems.com/contact ams AG Technical content still valid