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NXP Semiconductors
PCA9685
16-channel, 12-bit PWM Fm+ I 2 C-bus LED controller
Table 3.
Register summary …continued
Register # Register # D7 D6 D5 D4 D3 D2 D1 D0 Name
(decimal)
(hex)
Type
Function
22
16
0
0
0
1
0
1
1
0
LED4_ON_L
read/write
LED4 output and
brightness control byte 0
23
17
0
0
0
1
0
1
1
1
LED4_ON_H
read/write
LED4 output and
brightness control byte 1
24
18
0
0
0
1
1
0
0
0
LED4_OFF_L
read/write
LED4 output and
brightness control byte 2
25
19
0
0
0
1
1
0
0
1
LED4_OFF_H
read/write
LED4 output and
brightness control byte 3
26
1A
0
0
0
1
1
0
1
0
LED5_ON_L
read/write
LED5 output and
brightness control byte 0
27
1B
0
0
0
1
1
0
1
1
LED5_ON_H
read/write
LED5 output and
brightness control byte 1
28
1C
0
0
0
1
1
1
0
0
LED5_OFF_L
read/write
LED5 output and
brightness control byte 2
29
1D
0
0
0
1
1
1
0
1
LED5_OFF_H
read/write
LED5 output and
brightness control byte 3
30
1E
0
0
0
1
1
1
1
0
LED6_ON_L
read/write
LED6 output and
brightness control byte 0
31
1F
0
0
0
1
1
1
1
1
LED6_ON_H
read/write
LED6 output and
brightness control byte 1
32
20
0
0
1
0
0
0
0
0
LED6_OFF_L
read/write
LED6 output and
brightness control byte 2
33
21
0
0
1
0
0
0
0
1
LED6_OFF_H
read/write
LED6 output and
brightness control byte 3
34
22
0
0
1
0
0
0
1
0
LED7_ON_L
read/write
LED7 output and
brightness control byte 0
35
23
0
0
1
0
0
0
1
1
LED7_ON_H
read/write
LED7 output and
brightness control byte 1
36
24
0
0
1
0
0
1
0
0
LED7_OFF_L
read/write
LED7 output and
brightness control byte 2
37
25
0
0
1
0
0
1
0
1
LED7_OFF_H
read/write
LED7 output and
brightness control byte 3
38
26
0
0
1
0
0
1
1
0
LED8_ON_L
read/write
LED8 output and
brightness control byte 0
39
27
0
0
1
0
0
1
1
1
LED8_ON_H
read/write
LED8 output and
brightness control byte 1
40
28
0
0
1
0
1
0
0
0
LED8_OFF_L
read/write
LED8 output and
brightness control byte 2
41
29
0
0
1
0
1
0
0
1
LED8_OFF_H
read/write
LED8 output and
brightness control byte 3
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.
10 of 51
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