8x3-CHANNEL CONSTANT CURRENT LED DRIVERS

 General Description

        The DM164 is a LED current sink driver incorporating independent shift registers and data latches for grayscale PWM data (GD mode*1) and current adjustment data (D&G mode*1), 8x3-channels constant current circuitry with current value set by 3 external resistors, 65,536 grayscale PWM function unit, 128 levels current adjustment for each channel and 256 levels global brightness control (White balance). Each channel provides maximum current of 90mA. The DM164 also supports the LED open detection capability, thermal alarm and shutdown function. There are two methods to communicate error signals 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 with current value set by 3 external resistors.

  ◆ Max PWM clock frequency Cascade: 36MHz@VDD=3.3V(Refresh rate≒550Hz), 40MHz@VDD=5V (610Hz)

 ◆ Max data clock frequency Cascade: 30MHz@VDD=3.3V, 35MHz@VDD=5V

 ◆ Maximum output current: 90mA 

◆ Maximum output voltage: 17V 

◆ 16-bit grayscale for each LED 

◆ 8-bit current adjustment for global brightness control (White Balance) 

◆ 7-bit current adjustment for each LED (Dot Correction) 

◆ Supply Voltage: 3V to 5.5V 

◆ LED Open Detection 

◆ Thermal Alarm and Shutdown

     Alarm (junction temperature >130o C)

    Shutdown (junction temperature > 170o C) 

◆ One-Shot Option

◆ Built-in Buffer for Data, PWM Clock, Latch signal and Data Clock 

◆ Average Separate IOUT PWM Waveform Option