PCA9632DP2 datasheet(2/38 Pages) NXP

2 / 38 page

PCA9632_3

Product data sheet

Rev. 03 — 15 July 2008

2 of 38

NXP Semiconductors

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.

Features

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 dimming

mode

I In group dimming 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 blinking

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 10-pin package option provides two hardware address pins allowing four devices to

operate on the same bus

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

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