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NXP Semiconductors
Table 10.
PCU9955
16-channel UFm I 2 C-bus 57 mA constant current LED driver
PWM0 to PWM15 - PWM registers 0 to 15 (address 0Ah to 19h) bit description
…continued
Address
Register
Bit
Symbol
Access Value
Description
17h
18h
19h
PWM13
PWM14
PWM15
7:0
7:0
7:0
IDC13[7:0]
IDC14[7:0]
IDC15[7:0]
W only
W only
W only
0000 0000* PWM13 Individual Duty Cycle
0000 0000* PWM14 Individual Duty Cycle
0000 0000* PWM15 Individual Duty Cycle
A 31.25 kHz fixed frequency signal is used for each output. Duty cycle is controlled
through 256 linear steps from 00h (0 % duty cycle = LEDn output off) to FFh
(99.6 % duty cycle = LEDn output at maximum brightness). Applicable to LEDn outputs
programmed with LDRx = 10 or 11 (LEDOUT0 to LEDOUT3 registers).
IDCx ? 7 : 0 ?
duty cycle = --------------------------
256
(3)
Remark: The first lower end 8 steps of PWM and the last (higher end) steps of PWM will
not have effective brightness control of LEDs due to edge rate control of LEDn output
pins.
7.3.7 IREF0 to IREF15, LEDn output current value registers
These registers reflect the gain settings for output current for LED0 to LED15.
Table 11.
IREF0 to IREF15 - LEDn output gain control registers (address 22h to 31h)
bit description
Legend: * default value.
Address
22h
23h
24h
25h
26h
27h
28h
29h
2Ah
2Bh
2Ch
2Dh
2Eh
2Fh
30h
31h
Register
IREF0
IREF1
IREF2
IREF3
IREF4
IREF5
IREF6
IREF7
IREF8
IREF9
IREF10
IREF11
IREF12
IREF13
IREF14
IREF15
Bit
7:0
7:0
7:0
7:0
7:0
7:0
7:0
7:0
7:0
7:0
7:0
7:0
7:0
7:0
7:0
7:0
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
00h*
00h*
00h*
00h*
00h*
00h*
00h*
00h*
00h*
00h*
00h*
00h*
00h*
00h*
00h*
00h*
Description
LED0 output current setting
LED1 output current setting
LED2 output current setting
LED3 output current setting
LED4 output current setting
LED5 output current setting
LED6 output current setting
LED7 output current setting
LED8 output current setting
LED9 output current setting
LED10 output current setting
LED11 output current setting
LED12 output current setting
LED13 output current setting
LED14 output current setting
LED15 output current setting
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.
14 of 39
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