NXP Semiconductors
PCA9685
16-channel, 12-bit PWM Fm+ I 2 C-bus LED controller
LED supply
V DD = 2.5 V, 3.3 V or 5.0 V
V IN
CONSTANT
CURRENT
SWITCH MODE
REGULATOR
FB
OUT
LIGHT
SENSOR
I constant
LED
string
ASIC/MICRO
(1)
(1)
10 k Ω (2)
V DD
SDA
SCL
OE
SDA
SCL
OE
LED0
LED1
LED2
LED3
Rsense
PCA9685
LED4
LED5
LED6
LED7
EXTCLK
LED8
LED9
LED10
LED11
A0
A1
A2
A3
A4
LED12
LED13
A5
LED14
V SS
LED15
002aac828
I 2 C-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, “I 2 C-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
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 2 September 2010
? NXP B.V. 2010. All rights reserved.
36 of 51
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