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NXP Semiconductors
PCU9955
16-channel UFm I 2 C-bus 57 mA constant current LED driver
General Call address
SWRST data byte 1
S
0
0
0
0
0
0
0
0
1
0
0
0
0
0
1
1
0
1
P
Fig 7.
START condition
SWRST Call
this bit is
always = 1
this bit is
always = 1
STOP
condition
002aaf099
7.7 Individual brightness control with group dimming/blinking
A 31.25 kHz fixed frequency signal with programmable duty cycle (8 bits, 256 steps) is
used to control individually the brightness for each LED.
On top of this signal, one of the following signals can be superimposed (this signal can be
applied to the 16 LEDn output control registers LEDOUT0 to LEDOUT3):
? A lower 122 Hz fixed frequency signal with programmable duty cycle (8 bits,
256 steps) is used to provide a global brightness control.
? A programmable frequency signal from 15 Hz to every 16.8 seconds (8 bits,
256 steps) with programmable duty cycle (8 bits, 256 steps) is used to provide a
global blinking control.
1
2
3
4
5
6
7
8
9 10 11 12
251
252
253
254
255
256
1
2
3
4
5
6
7
8
9 10 11
Brightness Control signal (LEDn)
N × 125 ns
with N = (0 to 255)
M × 256 × 125 ns
with M = (0 to 255)
(GRPPWM Register)
(PWMx Register)
256 × 125 ns = 32 μ s
(31.25 kHz)
Group Dimming signal
256 × 256 × 125 ns = 8.19 ms (122 Hz)
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
resulting Brightness + Group Dimming signal
002aaf935
Minimum pulse width for LEDn Brightness Control is 125 ns.
Minimum pulse width for Group Dimming is 32 ? s.
When M = 1 (GRPPWM register value), the resulting LEDn Brightness Control + Group Dimming signal will have 1 pulse of the
LED Brightness Control signal (pulse width = N ? 125 ns, with ‘N’ defined in PWMx register).
This resulting Brightness + Group Dimming signal above shows a resulting Control signal with M = 8.
Fig 8.
Brightness + Group Dimming signals
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.
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