4-CHANNEL LED DIMMER DRIVER
MOSDESIGN SEMICONDUCTOR CORP.
4-CHANNEL LED DIMMER DRIVER
LED DRIVER M1357
GENERAL DESCRIPTION
The M1357 is a monolit...
Description
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 ...
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