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NXP Semiconductors
PCU9955
16-channel UFm I 2 C-bus 57 mA constant current LED driver
9. Bus transactions
slave address
control register (1)
data for register D[7:0]
S
1
1
0 A3 A2 A1 A0 0
1 AIF D6 D5 D4 D3 D2 D1 D0 1
1
P
START condition
W
Auto-Increment flag
this bit is
this bit is
always = 1
this bit is
always = 1
always = 1
STOP
condition
002aaf102
(1) See Table 4 for register definition.
Fig 13. Write to a specific register
slave address
control register
MODE1 register data (1)
MODE2 register data
S
1
1
0 A3 A2 A1 A0 0
1
1
0
0
0
0
0
0
0
1
1
1
(cont.)
START condition
W
this bit is
always = 1
MODE1
register selection
Auto-Increment on
this bit is
always = 1
this bit is
always = 1
this bit is
always = 1
ALLCALL address register data
(cont.)
1
P
this bit is
always = 1
STOP
condition
(1) AI1, AI0 = 00. See Table 3 for Auto-Increment options.
Remark: Care should be taken to load the appropriate value here in the AI1 and AI0 bits of the MODE1 register for
programming the part with the required Auto-Increment options.
Fig 14. Write to all registers using the Auto-Increment feature
002aaf103
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.
23 of 39
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