Data Sheet

PCA9685 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2010. All rights reserved.
Product data sheet Rev. 3 — 2 September 2010 31 of 51
NXP Semiconductors
PCA9685
16-channel, 12-bit PWM Fm+ I
2
C-bus LED controller
9. Bus transactions
(1) See Table 3 for register definition.
Fig 20. Write to a specific register
A5 A4 A3 A2 A1 A0 0 AS 1
slave address
START condition R/W acknowledge
from slave
002aac82
9
data for register D[7:0]
(1)
D6 D5 D4 D3 D2 D1 D0D7
control register
A
acknowledge
from slave
A
acknowledge
from slave
P
STOP
condition
Fig 21. Write to all registers using the Auto-Increment feature; AI initially clear
A5 A4 A3 A2 A1 A0 0 AS 1
slave address
START condition R/W
002aad18
7
MODE1 register
0 0 0 0 0 0 00
control register = MODE1 register
A
acknowledge
from slave
A
acknowledge
from slave
P
STOP
condition
(cont.)
(cont.)
MODE2 register
A
acknowledge
from slave
LED15_OFF_L register
A
acknowledge
from slave
LED15_OFF_H register
A
acknowledge
from slave
acknowledge
from slave
1
AI bit set