DIMMER DRIVER. M1357 Datasheet

M1357 DRIVER. Datasheet pdf. Equivalent

M1357 Datasheet
Recommendation M1357 Datasheet
Part M1357
Description 4-CHANNEL LED DIMMER DRIVER
Feature M1357; MOSDESIGN SEMICONDUCTOR CORP. 4-CHANNEL LED DIMMER DRIVER LED DRIVER M1357 GENERAL DESCRIPTION Th.
Manufacture MOSDESIGN
Datasheet
Download M1357 Datasheet





MOSDESIGN M1357
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
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



MOSDESIGN M1357
一華半導體股份有限公司
MOSDESIGN SEMICONDUCTOR CORP.
4-CHANNEL LED DIMMER DRIVER
LED DRIVER
M1357
DATA VALIDITY
The data on SDIO line must be stable during the HIGH period of the clock signal (SCL). In other words, state of the data line can
only be changed when CLK is LOW.
SCL
SDA
data
change
allowed
data
valid
data
change
allowed
data
valid
data
change
allowed
START and STOP conditions
START and STOP conditions classify the beginning and the end of the Serial Bus session. A START condition is defined as SDA
signal transitioning from HIGH to LOW while SCL line is HIGH. A STOP condition is defined as the SDA transitioning from
LOW to HIGH while SCL is HIGH. The Serial Bus master always generates START and STOP conditions. The Serial Bus is
considered to be busy after a START condition and free after a STOP condition. During data transmission, the Serial Bus master
can generate repeated START conditions. First START and repeated START conditions are equivalent, function-wise.
SDA
SCL
S
START Condition
P
STOP Condition
TRANSFERING DATA
Every byte put on the SDA line must be eight bits long, with the most significant bit (MSB) transferred first. Each byte of data has
to be followed by an acknowledge bit. The acknowledge related clock pulse is generated by the master. The master releases the
SDA line (HIGH) during the acknowledge clock pulse.
3/5 2010-03-09





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