View Full Version : Interesting LED driver, 4 programmable PWM pins via I2C(motor control)

T Chap
03-20-2007, 06:35 PM
www.standardics.nxp.com/products/pca/pdf/pca9633.pdf (http://www.standardics.nxp.com/products/pca/pdf/pca9633.pdf)

I was looking for a way to individually dim some LEDs via I2C, and ran across this part. Since it is simply 4 I2C programmable PWM pins, it could be used just as well for 4 PWM motor speed controls.

Maybe somebody might be inspired by it. Digi has them for around 1.60


The PCA9633 is an I2C-bus controlled 4-bit LED driver optimized for
Red/Green/Blue/Amber (RGBA) color mixing applications. Each LED output has its own
8-bit resolution (256 steps) fixed frequency Individual PWM controller that operates at
97 kHz with a duty cycle that is adjustable from 0 % to 99.6 % to allow the LED to be set
to a specific brightness value. A fifth 8-bit resolution (256 steps) Group PWM controller
has both a fixed frequency of 190 Hz and an adjustable frequency between 24 Hz to once
every 10.73 seconds with a duty cycle that is adjustable from 0 % to 99.6 % that is used to
either dim or blink all LEDs with the same value.

Post Edited (originator) : 3/20/2007 5:33:13 PM GMT

03-21-2007, 02:00 AM
Very cool !!!




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