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| AS1112 16-Channel LED Driver with Dot Correction and Greyscale PWM Product Brief 1 General Description The AS1112 is a 16-channel, constant current-sink LED driver. Each of the 16 channels can be individually adjusted by 4096-step greyscale PWM brightness control and 64-step constant-current sink (dot correction). The dot correction circuitry adjusts the brightness variations between the AS1112 channels and other LED drivers. Greyscale control and dot correction circuitry are accessible via the SPI-compatible serial interface. A single external resistor sets the maximum current value of all 16 channels. The device features two error detection functions. The open & short LED detection function indicates a broken, shorted or disconnected LED at one or more of the outputs. The overtemperature flag indicates that the device is in an overtemperature condition. An additional power-down pin puts the AS1112 into a 40nA standby-mode. The AS1112 is available in a 32-pin TQFN 5x5 mm package. 2 Key Features ! ! ! ! ! ! ! ! ! ! ! 16 Channels Greyscale PWM Control: 12-Bit (4096 Steps) Dot Correction: 6-Bit (64 Steps) Drive Capability (Constant-Current Sink): 0 to 80mA LED Power Supply Voltage: Up to 15V Supply Voltage Range: 3.0 to 5.5 V SPI-Compatible Serial Interface Controlled In-Rush Current Data Transfer & PWM Clock Rate: up to 30 MHz CMOS Level I/O Diagnostic Features - LED Open/Short Detection - Overtemperature Flag 32-pin TQFN 5x5 mm Package ! 3 Applications Figure 1. Block Diagram 1 CLK 26 IREF 24 GSCLK 31 OEN Status Open LED Detect, Overtemperature Flag, Dot Correction Data 3 MODE The device is ideal for mono-, multi-, and full-color LED displays, LED signboards, and display backlights. 2 SDI 32 LD 29 PD Control Greyscale 0 Register 11 12-Bit Greyscale PWM Control 6-Bit Dot Correction Constant Current Driver 4 Delay x0 OUT0 Max OUTn Current VREF = 1.24V Greyscale Counter Control Input Shift Register Dot Correction 0 Register 5 Open&Short LED Detection Control Greyscale 12 Register 23 Dot Correction 6 Register 11 12-Bit Greyscale PWM Control 6-Bit Dot Correction Constant Current Driver 5 Delay x1 OUT1 . . . Constant Current Driver 21 Delay x15 OUT15 . Thermal Flag Open LED Detect Open&Short LED Detection Control 12-Bit Greyscale PWM Control 6-Bit Dot Correction 23 27 VCC . . Input Shift Register Greyscale 180 Register191 Dot Correction 90 Register 95 22 XERR 30 GND Open&Short LED Detection AS1112 SDO www.austriamicrosystems.com Revision 1.01 1-2 AS1112 Product Brief Copyrights Copyright (c) 1997-2007, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered (R). 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 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 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 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 A-8141 Schloss Premstaetten, Austria Tel: +43 (0) 3136 500 0 Fax: +43 (0) 3136 525 01 For Sales Offices, Distributors and Representatives, please visit: http://www.austriamicrosystems.com/contact www.austriamicrosystems.com Revision 1.01 2-2 |
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