PCA9685 datasheet(36/51 Pages) NXP

36 / 51 page

PCA9685

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Product data sheet

Rev. 3 — 2 September 2010

36 of 51

NXP Semiconductors

PCA9685

16-channel, 12-bit PWM Fm+ I2C-bus LED controller

I2C-bus address = 1010 101x.

Remark: Set INVRT = 0, OUTDRV = 1, OUTNE = 01 (MODE2 register bits) for this configuration.

(1) Resistor value should be chosen by referencing Section 7 of UM10204, “I2C-bus specification and

user manual”.

(2) OE requires pull-up resistor if control signal from the master is open-drain.

Fig 27. LCD backlighting application

PCA9685

LED0

LED1

SDA

SCL

VDD = 2.5 V, 3.3 V or 5.0 V

ASIC/MICRO

002aac828

SDA

SCL

(1)

LED2

LED3

VDD

VSS

10 k

Ω(2)

LED4

LED5

LED6

LED7

LED8

LED9

LED10

LED11

LED12

LED13

LED14

LED15

CONSTANT

CURRENT

SWITCH MODE

REGULATOR

OUT

VIN

Iconstant

LIGHT

SENSOR

LED supply

Rsense

LED

string

EXTCLK

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