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PCA9532

16-bit I²C LED dimmer

Philips Electronics 

Philips Semiconductors

16-bit I2C LED dimmer

Product data

PCA9532

FEATURES

• 16 LED drivers (on, off, flashing at a programmable rate)

• 2 selectable, fully programmable blink rates (frequency and duty

cycle) between 0.625 and 160 Hz (6.4 seconds and

6.25 milliseconds)

• 256 brightness steps

• Input/outputs not used as LED drivers can be used as regular

GPIOs

• Internal oscillator requires no external components

• I2C-bus interface logic compatible with SMBus

• Internal power-on reset

• Noise filter on SCL/SDA inputs

• Active-LOW reset input

• 16 open drain outputs directly drive LEDs to 25 mA

• Controlled edge rates to minimize ground bounce

• No glitch on power-up

• Supports hot insertion

• Low stand-by current

• Operating power supply voltage range of 2.3 V to 5.5 V

• 0 to 400 kHz clock frequency

• ESD protection exceeds 2000 V HBM per JESD22-A114,

150 V MM per JESD22-A115 and 1000 V CDM per JESD22-C101

• Latch-up testing is done to JEDEC Standard JESD78 which

exceeds 100 mA

• Packages offered: SO24, TSSOP24, HVQFN24

DESCRIPTION

The PCA9532 is a 16-bit I2C-bus and SMBus I/O expander

optimized for dimming LEDs in 256 discrete steps for

Red/Green/Blue (RGB) color mixing and back light applications.

The PCA9532 contains an internal oscillator with two user

programmable blink rates and duty cycles coupled to the output

PWM. The LED brightness is controlled by setting the blink rate high

enough (> 100 Hz) that the blinking cannot be seen and then using

the duty cycle to vary the amount of time the LED is on and thus the

average current through the LED.

The initial set-up sequence programs the two blink rates/duty cycles

for each individual PWM. From then on, only one command from the

bus master is required to turn individual LEDs ON, OFF, BLINK

RATE 1 or BLINK RATE 2. Based on the programmed frequency

and duty cycle, BLINK RATE 1 and BLINK RATE 2 will cause the

LEDs to appear at a different brightness or blink at periods up to

1.6 seconds. The open drain outputs directly drive the LEDs with

maximum output sink current of 25 mA per bit and 200 mA per

package (100 mA per octal).

To blink LEDs at periods greater than 1.6 seconds the bus master

(MCU, MPU, DSP, chipset, etc.) must send repeated commands to

turn the LED on and off as is currently done when using normal I/O

Expanders like the Philips PCF8575 or PCA9555. Any bits not used

for controlling the LEDs can be used for General Purpose Parallel

Input/Output (GPIO) expansion which provides a simple solution

when additional I/O is needed for ACPI power switches, sensors,

pushbuttons, alarm monitoring, fans, etc.

The active-LOW hardware reset pin (RESET) and Power-On Reset

(POR) initializes the registers to their default state, all zeroes,

causing the bits to be set HIGH (LED off).

Three hardware address pins on the PCA9532 allow eight devices

to operate on the same bus.

ORDERING INFORMATION

PACKAGES

TEMPERATURE RANGE

ORDER CODE

TOPSIDE MARK

24-pin plastic SO

-40 to +85 °C

PCA9532D

PCA9532D

24-pin plastic TSSOP

-40 to +85 °C

PCA9532PW

PCA9532

24-pin plastic HVQFN

-40 to +85 °C

PCA9532BS

9532

Standard packing quantities and other packaging data is available at www.philipslogic.com/packaging.

I2C is a trademark of Philips Semiconductors Corporation.

DRAWING NUMBER

SOT137-1

SOT355-1

SOT616-1

2003 May 02

2

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