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PCA9551

NXP
Part Number PCA9551
Manufacturer NXP
Description 8-bit I2C LED driver
Published Mar 22, 2005
Detailed Description PCA9551 8-bit I2C-bus LED driver with programmable blink rates Rev. 08 — 31 July 2008 Product data sheet 1. General ...
Datasheet PDF File PCA9551 PDF File

PCA9551
PCA9551

Overview
PCA9551 8-bit I2C-bus LED driver with programmable blink rates Rev.
08 — 31 July 2008 Product data sheet 1.
General description The PCA9551 LED blinker blinks LEDs in I2C-bus and SMBus applications where it is necessary to limit bus traffic or free up the I2C-bus 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 PCA9551 LED blinker instead requires only the ini...


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