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PCA9632 Datasheet

4-bit Fm I2C-bus low power LED driver

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PCA9632
4-bit Fm+ I2C-bus low power LED driver
Rev. 01 — 28 September 2007
Objective data sheet
1. General description
The PCA9632 is an I2C-bus controlled 4-bit LED driver optimized for
Red/Green/Blue/Amber (RGBA) color mixing applications. The PCA9632 is a drop-in
upgrade for the PCA9633 with 40× power reduction. In individual brightness control mode,
each LED output has its own 8-bit resolution (256 steps) fixed frequency Individual PWM
controller that operates at 1.5625 kHz with a duty cycle that is adjustable from 0 % to
99.6 % to allow the LED to be set to a specific brightness value. In group dimming mode,
each LED output has its own 6-bit resolution (64 steps) fixed frequency Individual PWM
controller that operates at 6.25 kHz with a duty cycle that is adjustable from 0 % to 98.4 %
to allow the LED to be set to a specific brightness value. A fifth 4-bit resolution (16 steps)
Group PWM controller has a fixed frequency of 190 Hz that is used to dim all the LEDs
with the same value.
While operating in the Blink mode, each LED output has its own 8-bit resolution
(256 steps) fixed frequency individual PWM controller that operates at 1.5625 kHz with a
duty cycle that is adjustable from 0 % to 99.6 % to allow the LED to be set to a specific
brightness value. Blink rate is controlled by the Group Frequency setting that has 8-bit
resolution (256 steps). The blink rate is adjustable between 24 Hz to once every
10.73 seconds. For Group Frequency settings between 6 Hz and 24 Hz, the Group PWM
has a 6-bit resolution (64 steps) with a duty cycle that is adjustable from 0 % to 98.4 %.
For Group frequency settings between 6 Hz to 0.09 Hz (once in 10.73 seconds), the
Group PWM has an 8-bit resolution (256 steps) with a duty cycle that is adjustable from
0 % to 99.6 %.
Each LED output can be off, on (no PWM control), set at its Individual PWM controller
value or at both Individual and Group PWM controller values. The LED output driver is
programmed to be either open-drain with a 25 mA current sink capability at 5 V or
totem-pole with a 25 mA sink, 10 mA source capability at 5 V. The PCA9632 operates with
a supply voltage range of 2.3 V to 5.5 V and the outputs are 5.5 V tolerant. LEDs can be
directly connected to the LED output (up to 25 mA, 5.5 V) or controlled with external
drivers and a minimum amount of discrete components for larger current or higher voltage
LEDs.
The PCA9632 is in the new Fast-mode Plus (Fm+) family. Fm+ devices offer higher
frequency (up to 1 MHz) and more densely populated bus operation (up to 4000 pF).
Software programmable LED Group and three Sub Call I2C addresses allow all or defined
groups of PCA9632 devices to respond to a common I2C-bus address, allowing for
example, all red LEDs to be turned on or off at the same time or marquee chasing effect,
thus minimizing I2C-bus commands.


NXP Semiconductors Electronic Components Datasheet

PCA9632 Datasheet

4-bit Fm I2C-bus low power LED driver

No Preview Available !

PCA9632 pdf
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PCA9632
4-bit Fm+ I2C-bus low power LED driver
The Software Reset (SWRST) Call allows the master to perform a reset of the PCA9632
through the I2C-bus, identical to the Power-On Reset (POR) that initializes the registers to
their default state causing the outputs to be set high-impedance. This allows an easy and
quick way to reconfigure all device registers to the same condition.
2. Features
PCA9632_1
Objective data sheet
I 40× power reduction compared to PCA9633
I 4 LED drivers. Each output programmable at:
N Off
N On
N Programmable LED brightness
N Programmable group dimming/blinking mixed with individual LED brightness
I 1 MHz Fast-mode Plus I2C-bus interface with 30 mA high drive capability on SDA
output for driving high capacitive buses
I 256-step (8-bit) linear programmable brightness per LED output varying from fully off
(default) to maximum brightness using a 1.5625 kHz PWM signal in individual
brightness mode
I 64-step (6-bit) linear programmable brightness for each LED output varying from fully
off (default) to maximum brightness using a 6.25 kHz PWM signal in Group dim mode
I In group dim mode 16-step group brightness control allows global dimming (using a
190 Hz PWM signal) from fully off to maximum brightness (default)
I 256-step (8-bit) linear programmable brightness per LED output varying from fully off
(default) to maximum brightness using a 1.5625 kHz PWM signal in group blink mode
I 64-step group blinking with frequency programmable from 24 Hz to 6 Hz and
duty cycle from 0 % to 98.4 %
I 256-step group blinking with frequency programmable from 6 Hz to 0.09 Hz (10.73 s)
and duty cycle from 0 % to 99.6 %
I Four totem-pole outputs (sink 25 mA and source 10 mA at 5 V) with software
programmable open-drain LED outputs selection (default at high-impedance). No input
function.
I Output state change programmable on the Acknowledge or the STOP Command to
update outputs byte-by-byte or all at the same time (default to ‘Change on STOP’).
I Software Reset feature (SWRST Call) allows the device to be reset through the
I2C-bus
I 400 kHz internal oscillator requires no external components
I Internal power-on reset
I Noise filter on SDA/SCL inputs
I Edge rate control on outputs
I No glitch on power-up
I Supports hot insertion
I Low standby current of < 1 µA
I Operating power supply voltage range of 2.3 V to 5.5 V
I 5.5 V tolerant inputs
I 40 °C to +85 °C operation
I ESD protection exceeds 5000 V HBM per JESD22-A114, 200 V MM per
JESD22-A115, and 1000 V CDM per JESD22-C101
Rev. 01 — 28 September 2007
© NXP B.V. 2007. All rights reserved.
2 of 32


Part Number PCA9632
Description 4-bit Fm I2C-bus low power LED driver
Maker NXP Semiconductors
Total Page 30 Pages
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