Data Sheet

PCA9685 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet Rev. 4 — 16 April 2015 5 of 52
NXP Semiconductors
PCA9685
16-channel, 12-bit PWM Fm+ I
2
C-bus LED controller
5. Block diagram
Remark: Only one LED output shown for clarity.
Fig 1. Block diagram of PCA9685
A0 A1 A2 A3 A4 A5
002aac824
I
2
C-BUS
CONTROL
INPUT FILTER
PCA9685
POWER-ON
RESET
SCL
SDA
V
DD
V
SS
LED
STAT E
SELECT
REGISTER
PWM
REGISTER X
BRIGHTNESS
CONTROL
MUX/
CONTROL
OE
'0' – permanently OFF
'1' – permanently ON
V
DD
LEDn
PRESCALE
25 MHz
OSCILLATOR
CLOCK
SWITCH
EXTCLK