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NXP Semiconductors
PCU9955
16-channel UFm I 2 C-bus 57 mA constant current LED driver
[1]
Change of the outputs at the STOP command allows synchronizing outputs of more than one PCU9955.
Applicable to registers from 02h (LEDOUT0) to 3Ah (OFFSET) only.
7.3.3 LEDOUT0 to LEDOUT3, LED driver output state
Table 7.
LEDOUT0 to LEDOUT3 - LED driver output state registers (address 02h to 05h)
bit description
Legend: * default value.
Address
02h
03h
04h
05h
Register
LEDOUT0
LEDOUT1
LEDOUT2
LEDOUT3
Bit
7:6
5:4
3:2
1:0
7:6
5:4
3:2
1:0
7:6
5:4
3:2
1:0
7:6
5:4
3:2
1:0
Symbol
LDR3
LDR2
LDR1
LDR0
LDR7
LDR6
LDR5
LDR4
LDR11
LDR10
LDR9
LDR8
LDR15
LDR14
LDR13
LDR12
Access
W only
W only
W only
W only
W only
W only
W only
W only
W only
W only
W only
W only
W only
W only
W only
W only
Value
00*
00*
00*
00*
00*
00*
00*
00*
00*
00*
00*
00*
00*
00*
00*
00*
Description
LED3 output state control
LED2 output state control
LED1 output state control
LED0 output state control
LED7 output state control
LED6 output state control
LED5 output state control
LED4 output state control
LED11 output state control
LED10 output state control
LED9 output state control
LED8 output state control
LED15 output state control
LED14 output state control
LED13 output state control
LED12 output state control
LDRx = 00 — LED driver x is off (default power-up state, x = 0 to 15).
LDRx = 01 — LED driver x is fully on (individual brightness and group dimming/blinking
not controlled).
LDRx = 10 — LED driver x individual brightness can be controlled through its PWMx
register.
LDRx = 11 — LED driver x individual brightness and group dimming/blinking can be
controlled through its PWMx register and the GRPPWM registers.
7.3.4 GRPPWM, group duty cycle control
Table 8. GRPPWM - Group brightness control register (address 08h) bit description
Legend: * default value
Address
08h
Register
GRPPWM
Bit
7:0
Symbol
GDC[7:0]
Access
W only
Value
1111 1111*
Description
GRPPWM register
When DMBLNK bit (MODE2 register) is programmed with logic 0, a 122 Hz fixed
frequency signal is superimposed with the 31.25 kHz individual brightness control signal.
GRPPWM is then used as a global brightness control allowing the LEDn outputs to be
dimmed with the same value. The value in GRPFREQ is then a ‘Don’t care’.
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.
12 of 39
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