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NXP Semiconductors
PCA9634
8-bit Fm+ I 2 C-bus LED driver
7.8 Individual brightness control with group dimming/blinking
A 97 kHz ?xed 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 4 LED outputs):
? A lower 190 Hz ?xed frequency signal with programmable duty cycle (8 bits,
256 steps) is used to provide a global brightness control.
? A programmable frequency signal from 24 Hz to 1 ? 10.73 Hz (8 bits, 256 steps) with
programmable duty cycle (8 bits, 256 steps) is used to provide a global blinking
control.
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9 10 11 12
507
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512
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8
9 10 11
Brightness Control signal (LEDn)
N × 40 ns
with N = (0 to 255)
M × 256 × 2 × 40 ns
with M = (0 to 255)
(GRPPWM Register)
(PWMx Register)
256 × 40 ns = 10.24 μ s
(97.6 kHz)
Group Dimming signal
256 × 2 × 256 × 40 ns = 5.24 ms (190.7 Hz)
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8
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8
resulting Brightness + Group Dimming signal
002aab417
Minimum pulse width for LEDn Brightness Control is 40 ns.
Minimum pulse width for Group Dimming is 20.48 μ s.
When M = 1 (GRPPWM register value), the resulting LEDn Brightness Control + Group Dimming signal will have 2 pulses of
the LED Brightness Control signal (pulse width = N × 40 ns, with ‘N’ de?ned in PWMx register).
This resulting Brightness + Group Dimming signal above shows a resulting Control signal with M = 4 (8 pulses).
Fig 8.
PCA9634_6
Brightness + Group Dimming signals
? NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 06 — 12 September 2008
19 of 38
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