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PCA9550 - 2-bit I2C LED driver

Description

The PCA9550 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, chip set, etc.) timer.

The uniqueness of this device is the internal oscillator with two programmable blink rates.

Features

  • I 2 LED drivers (on, off, flashing at a programmable rate) I 2 selectable, fully programmable blink rates (frequency and duty cycle) between 0.172 Hz and 44 Hz (5.82 seconds and 0.023 second) I Input/output not used as LED drivers can be used as regular GPIOs I Internal oscillator requires no external components I I2C-bus interface logic compatible with SMBus I Internal power-on reset I Noise filter on SCL/SDA inputs I Active LOW reset input I 2 open-drain outputs directly drive LEDs to 25 mA I Co.

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Datasheet preview – PCA9550

Datasheet Details

Part number PCA9550
Manufacturer NXP
File Size 150.21 KB
Description 2-bit I2C LED driver
Datasheet download datasheet PCA9550 Datasheet
Additional preview pages of the PCA9550 datasheet.

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Full PDF Text Transcription

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PCA9550 2-bit I2C-bus LED driver with programmable blink rates Rev. 05 — 13 October 2008 Product data sheet 1. General description The PCA9550 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, chip set, 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 PCA9550 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).
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