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NXP Semiconductors
PCA9632
4-bit Fm+ I 2 C-bus low power LED driver
Table 15.
Output transistors based on LEDOUT registers, INVRT and OUTDRV bits
LEDOUT
INVRT
OUTDRV Upper transistor Lower transistor (LEDn to
(V DD to LEDn)
V SS )
LEDn state
00
LED driver off
01
LED driver on
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
off
on
off
off
off
off
off
on
off
off
on
on
on
on
off
off
high-Z [1]
V DD
V SS
V SS
V SS
V SS
high-Z [1]
V DD
10
Individual
0
0
0
1
off
Individual PWM
Individual PWM (non-inverted) V SS or high-Z [1] = PWMx value
Individual PWM (non-inverted) V SS or V DD = PWMx value
brightness
(non-inverted)
control
1
1
0
1
off
Individual PWM
Individual PWM (inverted)
Individual PWM (inverted)
high-Z [1] or V SS = 1 ? PWMx value
V DD or V SS = 1 ? PWMx value
(inverted)
11
0
0
off
Individual + Group PWM
V SS or high-Z [1] =
Individual +
(non-inverted)
PWMx/GRPPWM values
group
dimming/
0
1
Individual PWM
(non-inverted)
Individual PWM (non-inverted) V SS or V DD = PWMx/GRPPWM
values
blinking
1
1
0
1
off
Individual PWM
(inverted)
Individual + Group PWM
(inverted)
Individual PWM (inverted)
high-Z [1] or V SS = (1 ? PWMx) or
(1 ? GRPPWM) values
V DD or V SS = (1 ? PWMx) or
(1 ? GRPPWM) values
[1]
External pull-up or LED current limiting resistor connects LEDn to V DD .
7.7 Individual brightness control with group dimming/blinking
A 1.5625 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 4 LED outputs):
? A lower 190 Hz fixed frequency signal with programmable duty cycle (4 bits, 16 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 (6 bits, 64 steps) is used to provide a global blinking control
for (24 Hz to 6 Hz) and (8 bits, 256 steps) for (6 Hz to 1 ? 10.73 Hz).
PCA9632
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 5 — 27 July 2011
? NXP B.V. 2011. All rights reserved.
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