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NXP Semiconductors
PCU9955
16-channel UFm I 2 C-bus 57 mA constant current LED driver
slave address (1)
control register
new LED All Call I 2 C address (2)
sequence (A) S
1
1
0 A3 A2 A1 A0 0
1
1
0
1
1
1
1
1
0
1
1
0
1
0
1
0
1
X
1
P
START condition
W
this bit is
always set to 1
ALLCALLADR
register selection
Auto-Increment on
this bit is
always set to 1
this bit is
always set to 1
STOP condition
the 16 LEDs are on at the 9th bit (3)
LED All Call I 2 C address
control register
LEDOUT0 register (LED fully ON)
sequence (B) S
1
0
1
0
1
0
1
0
1
1
0
0
0
0
0
1
0
1
0
1
0
1
0
1
0
1
1 (cont.)
START condition
W
this bit is
LEDOUT0
register selection
this bit is
always set to 1
this bit is
always set to 1
always set to 1
the 16 LEDs are on
at the 9th bit (3)
the 16 LEDs are on
at the 9th bit (3)
the 16 LEDs are on
at the 9th bit (3)
LEDOUT1 register (LED fully ON)
LEDOUT2 register (LED fully ON)
LEDOUT3 register (LED fully ON)
(cont.)
0
1
0
1
0
1
0
1
1
0
1
0
1
0
1
0
1
1
0
1
0
1
0
1
0
1
1
P
this bit is
always set to 1
this bit is
always set to 1
this bit is
always set to 1
STOP condition
002aaf105
(1) In this example, several PCU9955s are used and the same sequence (A) (above) is sent to each of them.
(2) ALLCALL bit in MODE1 register is previously set to 1 for this example.
(3) OCH bit in MODE2 register is previously set to 1 for this example.
Fig 16. LED All Call I 2 C-bus address programming and LED All Call sequence example
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.
25 of 39
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