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NXP Semiconductors
PCU9955
16-channel UFm I 2 C-bus 57 mA constant current LED driver
When the Control register is written, the register entry point determined by D[6:0] is the
first register that will be addressed and can be anywhere between 00h and 41h (as
defined in Table 4 ). When AIF = 1, the Auto-Increment Flag is set and the rollover value at
which the register increment stops and goes to the next one is determined by AIF, AI1 and
AI0. See Table 3 for rollover values. For example, if MODE1 register bit AI1 = 0 and
AI0 = 1 and if the Control register = 1001 0000, then the register addressing sequence will
be (in hexadecimal): 10 ? 11 ? … ? 19 ? 0A ? 0B ? … ? 19 ? 0A ? 0B ? … as
long as the master keeps sending data.
If MODE1 register bit AI1 = 0 and AI0 = 0 and if the Control register = 1010 0010, then the
register addressing sequence will be (in hexadecimal):
22 ? 23 ? … ? 41 ? 00 ? 01 ? … ? 19 ? 0A ? 0B ? … as long as the master
keeps sending data.
If MODE1 register bit AI1 = 0 and AI0 = 1 and if the Control register = 1000 0101, then the
register addressing sequence will be (in hexadecimal):
05 ? 06 ? … ? 19 ? 0A ? 0B ? … ? 19 ? 0A ? 0B ? … as long as the master
keeps sending data.
Remark: Writing to registers marked ‘not used’ will be ignored.
7.3 Register definitions
Table 4.
Register summary
Register
D6
D5
D4
D3
D2
D1
D0
Name
Type
Function
number
(hexadecimal)
00h
01h
02h
03h
04h
05h
06h
07h
08h
09h
0Ah
0Bh
0Ch
0Dh
0Eh
0Fh
10h
11h
12h
13h
14h
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
MODE1
MODE2
LEDOUT0
LEDOUT1
LEDOUT2
LEDOUT3
-
-
GRPPWM
GRPFREQ
PWM0
PWM1
PWM2
PWM3
PWM4
PWM5
PWM6
PWM7
PWM8
PWM9
PWM10
write only
write only
write only
write only
write only
write only
write only
write only
write only
write only
write only
write only
write only
write only
write only
write only
write only
write only
write only
write only
write only
Mode register 1
Mode register 2
LEDn output state 0
LEDn output state 1
LEDn output state 2
LEDn output state 3
not used [1]
not used [1]
group duty cycle control
group frequency
brightness control LED0
brightness control LED1
brightness control LED2
brightness control LED3
brightness control LED4
brightness control LED5
brightness control LED6
brightness control LED7
brightness control LED8
brightness control LED9
brightness control LED10
PCU9955
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 2 October 2012
? NXP B.V. 2012. All rights reserved.
9 of 39
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