PCA9552D datasheet(2/21 Pages) PHILIPS

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Philips Semiconductors

Product data sheet

PCA9552

16-bit I2C LED driver with

programmable blink rates

2004 Oct 01

FEATURES

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

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

cycle) between 0.172 Hz and 44 Hz (5.82 and 0.023 seconds)

• 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

• Edge rate control on outputs

• 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 JESDEC Standard JESD78 which

exceeds 100 mA

• Packages offered: SO24, TSSOP24, HVQFN24

DESCRIPTION

The PCA9552 LED Blinker blinks LEDs in I2C-bus and SMBus

applications where it is necessary to limit bus traffic or free up the

I2C Master’s (MCU, MPU, DSP, chipset, etc.) timer. The uniqueness

of this device is the internal oscillator with two programmable blink

rates. To blink LEDs using normal I/O Expanders like the PCF8574

or PCA9554, the bus master must send repeated commands to turn

the LED on and off. This greatly increases the amount of traffic on

the I2C-bus and uses up one of the master’s timers. The PCA9552

LED Blinker instead requires only the initial set up command to

program BLINK RATE 1 and BLINK RATE 2 (i.e., the frequency and

duty cycle) for each individual output. From then on, only one

command from the bus master is required to turn each individual

open drain output ON, OFF, or to cycle at BLINK RATE 1 or BLINK

RATE 2. Maximum output sink current is 25 mA per bit and 200 mA

per package.

Any bits not used for controlling the LEDs can be used for General

Purpose Parallel Input/Output (GPIO) expansion.

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 PCA9552 allow eight devices

to operate on the same bus.

ORDERING INFORMATION

PACKAGES

TEMPERATURE RANGE

ORDER CODE

TOPSIDE MARK

DRAWING NUMBER

24-pin plastic SO

–40

°C to +85 °C

PCA9552D

SOT137-1

24-pin plastic TSSOP

–40

°C to +85 °C

PCA9552PW

SOT355-1

24-pin plastic HVQFN

–40

°C to +85 °C

PCA9552BS

9552

SOT616-1

Standard packing quantities and other packaging data are available at www.standardproducts.philips.com/packaging.

I2C is a trademark of Philips Semiconductors Corporation.

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