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PCA9632DP2 Datasheet(PDF) 17 Page - NXP Semiconductors

Part # PCA9632DP2
Description  4-bit Fm I2C-bus low power LED driver
PDF  38 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCA9632DP2 Datasheet(HTML) 17 Page - NXP Semiconductors

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PCA9632_3
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 03 — 15 July 2008
17 of 38
NXP Semiconductors
PCA9632
4-bit Fm+ I2C-bus low power LED driver
[1]
External pull-up or LED current limiting resistor connects LEDn to VDD.
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).
Table 15.
Output transistors based on LEDOUT registers, INVRT and OUTDRV bits
LEDOUT
INVRT
OUTDRV Upper transistor
(VDD to LEDn)
Lower transistor (LEDn to
VSS)
LEDn state
00
LED driver off
0
0
off
off
high-Z[1]
0
1
on
off
VDD
1
0
off
on
VSS
1
1
off
on
VSS
01
LED driver on
0
0
off
on
VSS
0
1
off
on
VSS
1
0
off
off
high-Z[1]
1
1
on
off
VDD
10
Individual
brightness
control
0
0
off
Individual PWM (non-inverted) VSS or high-Z[1] = PWMx value
0
1
Individual PWM
(non-inverted)
Individual PWM (non-inverted) VSS or VDD = PWMx value
1
0
off
Individual PWM (inverted)
high-Z[1] or VSS = 1 − PWMx value
1
1
Individual PWM
(inverted)
Individual PWM (inverted)
VDD or VSS = 1 − PWMx value
11
Individual +
group
dimming/
blinking
0
0
off
Individual + Group PWM
(non-inverted)
VSS or high-Z[1] =
PWMx/GRPPWM values
0
1
Individual PWM
(non-inverted)
Individual PWM (non-inverted) VSS or VDD = PWMx/GRPPWM
values
1
0
off
Individual + Group PWM
(inverted)
high-Z[1] or VSS = (1 − PWMx) or
(1
− GRPPWM) values
1
1
Individual PWM
(inverted)
Individual PWM (inverted)
VDD or VSS =(1 − PWMx) or
(1
− GRPPWM) values



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