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NXP Semiconductors
PCU9955
16-channel UFm I 2 C-bus 57 mA constant current LED driver
7.3.1 MODE1 — Mode register 1
Table 5. MODE1 - Mode register 1 (address 00h) bit description
Legend: * default value.
Bit
7
6
Symbol
AIF
AI1
Access
-
W only
Value
-
0*
Description
not used
Auto-Increment bit 1 = 0. Auto-increment range as defined
in Table 3 .
1
Auto-Increment bit 1 = 1. Auto-increment range as defined
in Table 3 .
5
AI0
W only
0*
Auto-Increment bit 0 = 0. Auto-increment range as defined
in Table 3 .
1
Auto-Increment bit 0 = 1. Auto-increment range as defined
in Table 3 .
4
SLEEP
W only
0*
Normal mode [1] .
1
Low power mode. Oscillator off [2] .
3
SUB1
W only
0
PCU9955 does not respond to I 2 C-bus subaddress 1.
1*
PCU9955 responds to I 2 C-bus subaddress 1.
2
SUB2
W only
0*
PCU9955 does not respond to I 2 C-bus subaddress 2.
1
PCU9955 responds to I 2 C-bus subaddress 2.
1
SUB3
W only
0*
PCU9955 does not respond to I 2 C-bus subaddress 3.
1
PCU9955 responds to I 2 C-bus subaddress 3.
0
ALLCALL
W only
0
PCU9955 does not respond to LED All Call I 2 C-bus
address.
1*
PCU9955 responds to LED All Call I 2 C-bus address.
[1]
[2]
It takes 500 ? s max. for the oscillator to be up and running once SLEEP bit has been set to logic 0. Timings
on LEDn outputs are not guaranteed if PWMx, GRPPWM or GRPFREQ registers are accessed within the
500 ? s window.
No blinking or dimming is possible when the oscillator is off.
7.3.2 MODE2 — Mode register 2
Table 6. MODE2 - Mode register 2 (address 01h) bit description
Legend: * default value.
Bit
7
6
5
Symbol
-
-
DMBLNK
Access
-
-
W only
Value
-
-
0*
Description
not used
not used
group control = dimming.
1
group control = blinking.
4
3
-
OCH
-
W only
0*
0*
reserved
outputs change on STOP command [1]
1
outputs change on ACK, this 9th bit is always set to 1 by
UFm I 2 C-bus master
2
1
0
-
-
-
-
-
-
1*
0*
1*
reserved
reserved
reserved
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.
11 of 39
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