M1357

MOSDESIGN SEMICONDUCTOR CORP. 4-CHANNEL LED DIMMER DRIVER LED DRIVER M1357 GENERAL DESCRIPTION The M1357 is a monolithic, 4-channel NMOS PWM LED drivers Controller can also be directly programmed through an Serial Bus Micro-Processor Interface for applications where user defined LED pattern, color, and intensity programmability is a priority. Optimized for dimming LEDs in 256 discrete steps for Red/Green/Blue (RGB) color mixing and back light applications. The M1357 includes an internal oscillator , four individual PWM color LED drivers and The open drain outputs directly drive the LEDs with constant sink current of 15mA per bit. FEATURES ‧ 4 open drain outputs directly drive LEDs ‧ Constant sink current of 15mA per bit ‧ 256 brightness steps ‧ A0~A3 is External address selection. ‧ Internal oscillator requires no external components ‧ Controlled by Serial Bus Micro-Processor Interface ‧ Internal power-on reset ‧ Noise filter on SCL/SDA inputs APPLICATIONS ‧ True color LED display driver BLOCK DIAGRAM CLK OUT1 OUT2 OUT3 OUT4 SDA SCL Oscillator Input Filters 8-bit PWM 8 8-bit PWM 8-bit PWM 8-bit PWM 88 8 Serial Bus Decoder & Latch A0 A1 A2 A3 1/5 2010-03-09 MOSDESIGN SEMICONDUCTOR CORP. 4-CHANNEL LED DIMMER DRIVER LED DRIVER M1357 PIN DESCRIPTION Pin No Pin Name Description 1~4 A0~A3 Address input 5~8 LED1~LED4 LED driver1~4 10 VSS Negative power supply 11 CLK system clock output ( ~ 225KHz) 12 SCL Serial clock line 13 SDA Serial data line 14 ...