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MOSDESIGN

M1357 Datasheet Preview

M1357 Datasheet

4-CHANNEL LED DIMMER DRIVER

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一華半導體股份有限公司
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

M1357 Datasheet Preview

M1357 Datasheet

4-CHANNEL LED DIMMER DRIVER

No Preview Available !

一華半導體股份有限公司
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 VDD
Positive power supply.
M1357
A0 1 14 VDD
A1 SDA
A2 SCL
A3
LED1
CLK
VSS
LED2
LED3
7
8 LED4
DEVICE ADDRESSING
Following a START condition the bus master must output the address of the slave it is accessing. The address of the M1357 is
shown in Figure 4. To conserve power, no internal pull-up resistors are incorporated on the hardware selectable address pins and
they must be pulled HIGH or LOW.
Slave address
1 0 1 0 A3 A2 A1 A0 ACK
Fixed
Hardware selectable
WRITE to Register
SCL
clock pulse for acknowledgement
123456789
Slave address
Data to register
Data to register
Data to register
SDA S 1 0 1 0 A3 A2 A1 A0 A D7 LED1 DATA
MSB
LSB MSB
Start condition
acknowledge
D0 A D7 LED2 DATA
LSB MSB
acknowledge
D0 A D7 LED3 DATA
LSB MSB
acknowledge
D0 A D7 LED4 DATA
LSB MSB
acknowledge
D0 A P
LSB Stop condition
acknowledge
Write TO
REGISTER
Note:
1. D7-D0Sets Brightness for LED1~ LED4 DATA (Data to register). 11111111= Full scale
2. Acknowledge
The number of data bytes transferred between the start and the stop conditions from transmitter to receiver is not limited. Each
byte of eight bits is followed by one acknowledge bit. The acknowledge bit is a LOW level put on the bus by the transmitter
whereas the master generates an extra acknowledge related clock pulse.
2/5 2010-03-09


Part Number M1357
Description 4-CHANNEL LED DIMMER DRIVER
Maker MOSDESIGN
Total Page 5 Pages
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