AS1122B-BQFM

AS1122B-BQFM Datasheet

AS1122

Part	Datasheet
AS1122B-BQFM	AS1122B-BQFM (pdf)

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austriamicrosystems AG is now ams AG 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: Please visit our website at Datasheet AS1122 12-Channel LED Driver with Dot Correction and Greyscale PWM 1 General Description 2 Key Features The AS1122 is a 12-channel, constant current-sink LED driver. Each of the 12 channels can be individually adjusted by 4096-step greyscale PWM brightness control and 64-step constant-current sink lid dot correction . The dot correction circuitry adjusts the brightness variations between the AS1122 channels and other LED drivers. Greyscale control and dot correction circuitry are accessible via a simple SPI-compatible a serial interface. v The open LED detection function indicates a broken or disconnected LED at one or more of the outputs. The overtemperature flag indi- ill cates that the device is in an overtemperature condition. A single external resistor sets the maximum current value of all 12 channels. AG t st The AS1122 is available in a 24-pin QFN 4x4mm package. Greyscale PWM Control 12-Bit 4096 Steps Dot Correction 6-Bit 64 Steps Drive Capability Constant-Current Sink 0 to 40mA LED Power Supply Voltage up to 30V Supply Voltage Range 2.7V to 3.6V Output Delay for controlled Inrush Current factory set, can be turned off Factory set rise- and fall-time for EMI improvement Internal PWM Clock 10 MHz typ Data Transfer Clock Rate up to 5 MHz CMOS Level I/O Diagnostic Features 24-pin QFN 4x4mm Package s 3 Appliecatinons The device is ideal for mono-, multi-, and full-color LED displays, m tLED signboards, and display backlights. Technicaal con Figure AS1122 - Typical Application Diagram 1 - 22 AS1122 Datasheet - Pinout 4 Pinout Pin Assignments Figure Pin Assignments Top View s AGent still valid PinDescriptions m t Table Pin Descriptions Pin Number a n 1 o 2 7:12, 19:24 l 13 a 14 ic 16 n 18 3, 4, 17 Tech 25 Pin Name SDI CLKI CLKO SDO OUT0:OUT11 VDD IRQ IREF GND NC Thermal Pad Description Serial Data Input Serial Data Clock Input Serial Data Clock Output Serial Data Output Constant-Current Outputs 0:11 Power Supply Voltage Interrupt Request Output. Open drain pin, can be left open if not used. Reset Input. Pull this pin to high to reset all registers set to default values and to put the device into shutdown. Connect this pin to GND for normal operation. Reference Current Terminal. A resistor connected to this pin sets the maximum output currents see Setting Maximum Channel Current on page Ground Not Connected. Connect to GND if not used. Ground. This pin must be connected to GND to ensure normal operation. Datasheet - Ordering Information 10 Ordering Information The device is available as the standard products shown in Table Table Ordering Information Ordering Code Marking Delivery Form Package AS1122-BQFT lid AS1122B-BQFT* AS1122 AS1122B 12-Channel LED Driver with Dot Correction and Greyscale PWM 12-Channel LED Driver with Dot Correction and Greyscale PWM without Output Delay Tape and Reel Tape and Reel * on request Note All products are RoHS compliant and austriamicrosystems green. a Buy our products or get free samples online at ICdirect: v Technical Support is found at ill For further information and requests, please contact us Technicaaml scoAnGtent st orfind your local distributor at 24-pin QFN 4x4mm 24-pin QFN 4x4mm 21 - 22 AS1122 Datasheet Copyrights Copyright 1997-2012, austriamicrosystems AG, Tobelbaderstrasse 30, 8141 Unterpremstaetten, Austria-Europe. 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 lid Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing in its Term 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 a 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 life-support or life-sustaining equipment are v 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. ill 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, t performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of G austriamicrosystems AG rendering of technical or other services. aaml scoAntent s Contact Information ic Headquarters austriamicrosystems AG Tobelbaderstrasse 30 n A-8141 Unterpremstaetten, Austria Tel +43 0 3136 500 0 h Fax +43 0 3136 525 01 c For Sales Offices, Distributors and Representatives, please visit Te 22 - 22

PDF Datasheet Preview

austriamicrosystems AG is now
ams AG

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:

Please visit our website at

Datasheet

AS1122
12-Channel LED Driver with Dot Correction and Greyscale PWM
1 General Description
2 Key Features

The AS1122 is a 12-channel, constant current-sink LED driver. Each of the 12 channels can be individually adjusted by 4096-step greyscale PWM brightness control and 64-step constant-current sink
lid dot correction .

The dot correction circuitry adjusts the brightness variations between the AS1122 channels and other LED drivers. Greyscale control and dot correction circuitry are accessible via a simple SPI-compatible
a serial interface. v The open LED detection function indicates a broken or disconnected

LED at one or more of the outputs. The overtemperature flag indi-
ill cates that the device is in an overtemperature condition.

A single external resistor sets the maximum current value of all 12 channels.

AG t st The AS1122 is available in a 24-pin QFN 4x4mm package.

Greyscale PWM Control 12-Bit 4096 Steps Dot Correction 6-Bit 64 Steps Drive Capability Constant-Current Sink 0 to 40mA LED Power Supply Voltage up to 30V Supply Voltage Range 2.7V to 3.6V Output Delay for controlled Inrush Current factory set, can be turned off Factory set rise- and fall-time for EMI improvement Internal PWM Clock 10 MHz typ Data Transfer Clock Rate up to 5 MHz CMOS Level I/O Diagnostic Features 24-pin QFN 4x4mm Package
s 3 Appliecatinons The device is ideal for mono-, multi-, and full-color LED displays, m tLED signboards, and display backlights.

Technicaal con Figure AS1122 - Typical Application Diagram
1 - 22

AS1122

Datasheet - Pinout
4 Pinout

Pin Assignments

Figure Pin Assignments Top View
s AGent still valid PinDescriptions
m t Table Pin Descriptions

Pin Number
a n 1 o 2
7:12, 19:24
l 13 a 14
ic 16 n 18
3, 4, 17

Tech 25

Pin Name SDI CLKI CLKO SDO

OUT0:OUT11 VDD IRQ

IREF

GND NC Thermal Pad

Description Serial Data Input Serial Data Clock Input Serial Data Clock Output Serial Data Output Constant-Current Outputs 0:11 Power Supply Voltage Interrupt Request Output. Open drain pin, can be left open if not used. Reset Input. Pull this pin to high to reset all registers set to default values and to put the device into shutdown. Connect this pin to GND for normal operation. Reference Current Terminal. A resistor connected to this pin sets the maximum output currents see Setting Maximum Channel Current on page Ground Not Connected. Connect to GND if not used. Ground. This pin must be connected to GND to ensure normal operation.
Datasheet - Ordering Information
10 Ordering Information

The device is available as the standard products shown in Table
Table Ordering Information
Ordering Code

Marking

Delivery Form

Package

AS1122-BQFT
lid AS1122B-BQFT*

AS1122 AS1122B
12-Channel LED Driver with Dot Correction and Greyscale PWM
12-Channel LED Driver with Dot Correction and Greyscale PWM without Output Delay

Tape and Reel Tape and Reel
* on request

Note All products are RoHS compliant and austriamicrosystems green.
a Buy our products or get free samples online at ICdirect:
v Technical Support is found at
ill For further information and requests, please contact us Technicaaml scoAnGtent st orfind your local distributor at
24-pin QFN 4x4mm 24-pin QFN 4x4mm
21 - 22

AS1122

Datasheet

Copyrights

Copyright 1997-2012, austriamicrosystems AG, Tobelbaderstrasse 30, 8141 Unterpremstaetten, Austria-Europe. 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
lid Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing in its Term 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
a 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 life-support or life-sustaining equipment are
v 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.
ill 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,
t performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of G austriamicrosystems AG rendering of technical or other services. aaml scoAntent s Contact Information ic Headquarters
austriamicrosystems AG Tobelbaderstrasse 30
n A-8141 Unterpremstaetten, Austria

Tel +43 0 3136 500 0
h Fax +43 0 3136 525 01 c For Sales Offices, Distributors and Representatives, please visit Te
22 - 22

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived AS1122B-BQFM Datasheet file may be downloaded here without warranties.

Datasheet ID: AS1122B-BQFM 519573