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SILICON TOUCH TECHNOLOGY INC

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16-bit Constant Current LED Driver with Error Detection

Version:A.001

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DM137

DM137

16-bit Constant Current LED Driver

with Error Detection

General Description

DM137 is a constant-current sink driver specifically designed for LED display applications.

The device incorporates shift registers, data latches, and constant current circuitry on the silicon

CMOS chip. The maximum output current value of all 16 channels is adjustable by a single external

resistor. Its built-in open/short detection and thermal alarm circuits help users detect LED failures

and overheating. There are two methods to communicate the error messages to the system. One is

through serial output data to indicate which channel has failure. The other is by means of dedicated

Alarm pin.

Features

Constant-current outputs: 5mA to 90mA adjustable by one external resistor

Maximum output voltage: 17V

Maximum clock frequency: 25MHz

Built-in LED open/short detection: real-time monitor or smart detection modes

Fast detecting response: 0.1us (min.)

Over temperature protection:

Alarm (junction temperature > 110°C)

Shutdown (junction temperature > 180°C)

Power supply voltage: 3.3V to 5.5V

Applications

LED Variable Message Signs (VMS) System

Indoor/Outdoor LED Video Display