16 Channel 12Bit Pwm Servo

PCA9685 16 Channel PWM

The PCA9685 16 Channel PWM is an I2C-bus controlled 16-channel LED controller optimize for LCD Red/Green/Blue/Amber (RGBA) color backlighting applications. Each LED output has its own 12-bit resolution (4096 steps) fix frequency individual PWM controller that operates at a programmable frequency from a typical of 40 Hz to 1000 Hz with a duty cycle that is adjustable from 0 % to 100 % to allow the LED to be set to a specific brightness value. All outputs are set to the same PWM frequency.

The PCA9685 allows stagger LED output on and off times to minimize current surges. The on and off time delay is independently programmable for each of the 16 channels. This feature is not available in PCA9635.



• The PCA9685 has 4096 steps (12-bit PWM) of individual LED brightness control. The PCA9635 has only 256 steps (8-bit PWM).



• When multiple LED controlle are incorporate in a system, the PWM pulse widths between multiple devices may differ if PCA9635s are use. The PCA9685 has a programmable presale to adjust the PWM pulse widths of multiple devices.

PCA9685 16 Channel PWM

25 MHz typical internal oscillator requires no external components



External 50 MHz (max.) clock input



Internal power-on reset



Noise filter on SDA/SCL inputs



Edge rate control on outputs



No output glitches on power-up



Supports hot insertion



Low standby current



Operating power supply voltage range of 2.3 V to 5.5 V



5.5 V tolerant inputs



40 C to +85 C operation



ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per



JESD22-A115 and 1000 V CDM per JESD22-C101

Packages offer: TSSOP28, HVQFN28

The PCA9685 allows stagger LED output on and off times to minimize current



surges. The on and off time delay is independently programmable for each of the



16 channels. This feature is not available in PCA9635.

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• The PCA9685 has 4096 steps (12-bit PWM) of individual LED brightness control. The



PCA9635 has only 256 steps (8-bit PWM). en.wikipedia.org