Data Sheet

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Product data sheet Rev. 3 — 2 September 2010 12 of 51

NXP Semiconductors

PCA9685

16-channel, 12-bit PWM Fm+ I

C-bus LED controller

[1] Writes to PRE_SCALE register are blocked when SLEEP bit is logic 0 (MODE 1).

[2] Reserved. Writes to this register may cause unpredictable results.

Remark: Auto Increment past register 69 will point to MODE1 register (register 0).

Auto Increment also works from register 250 to register 254, then rolls over to register 0.

62 3E 0 0 1 1 1 1 1 0 LED14_ON_L read/write LED14 output and

brightness control byte 0

63 3F 0 0 1 1 1 1 1 1 LED14_ON_H read/write LED14 output and

brightness control byte 1

64 40 0 1 0 0 0 0 0 0 LED14_OFF_L read/write LED14 output and

brightness control byte 2

65 41 0 1 0 0 0 0 0 1 LED14_OFF_H read/write LED14 output and

brightness control byte 3

66 42 0 1 0 0 0 0 1 0 LED15_ON_L read/write LED15 output and

brightness control byte 0

67 43 0 1 0 0 0 0 1 1 LED15_ON_H read/write LED15 output and

brightness control byte 1

68 44 0 1 0 0 0 1 0 0 LED15_OFF_L read/write LED15 output and

brightness control byte 2

69 45 0 1 0 0 0 1 0 1 LED15_OFF_H read/write LED15 output and

brightness control byte 3

... reserved for future use

250 FA 1 1 1 1 1 0 1 0 ALL_LED_ON_L write/read

zero

load all the LEDn_ON

registers, byte 0

251 FB 1 1 1 1 1 0 1 1 ALL_LED_ON_H write/read

zero

load all the LEDn_ON

registers, byte 1

252 FC 1 1 1 1 1 1 0 0 ALL_LED_OFF_L write/read

zero

load all the LEDn_OFF

registers, byte 0

253 FD 1 1 1 1 1 1 0 1 ALL_LED_OFF_H write/read

zero

load all the LEDn_OFF

registers, byte 1

254 FE 1 1 1 1 1 1 1 0 PRE_SCALE

[1]

read/write prescaler for output

frequency

255 FF 11111111TestMode

[2]

read/write defines the test mode to

be entered

... All further addresses are reserved for future use; reserved addresses will not be acknowledged.

Table 3. Register summary

…continued

(decimal)

(hex)

D7 D6 D5 D4 D3 D2 D1 D0 Name Type Function