CAT3626_08 Datasheet, PDF (12/15 Pages) Catalyst Semiconductor – 6-Channel LED Driver with I2C™ Interface

CAT3626
Write Instruction Example setting 20mA current in LEDB1 and LEDB2
I²C Bus Protocol
SDA
SCL
1-7
8
ADDRESS R/W
START
Condition
9
ACK
1-7
8
ADDRESS
9
ACK
1-7
8
DATA
9
ACK
STOP
Condition
TYPICAL APPLICATION
The CAT3626 is ideal for driving RGB (red green blue)
LEDs with common anode configuration. The individual
LED currents associated with the red, green and blue
LEDs are programmable independently through the I²C
interface, allowing to generate an accurate color
mixing. Dimming while maintaining the same color can
be done by reprogramming the RegEn register on and
off with the appropriate duty cycle (PWM mode).
RGB LED
1µF
1µF
V_IN
3V to ^CIN
5.5V
1µF
ENABLE
I²C Interface
C1-
VIN
EN
SDA
SCL
C1+ C2- C2+
VOUT
CAT3626
LEDA1
LEDA2
LEDB1
LEDB2
LEDC1
GND
LEDC2
RGB LED
Red
Green Blue
C_OUT
1µF
Doc. No. MD-5014 Rev. D
12
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice