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PCA9550 Datasheet 2-bit I2c Led Driver

Manufacturer: NXP Semiconductors

Overview: 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 mands to turn the LED on and off.

Key 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.

More Datasheets from NXP Semiconductors

Part Number Description
PCA9551 8-bit I2C LED driver
PCA9552 16-bit I2C LED driver
PCA9553 4-bit I2C LED driver
PCA9554 8-bit I2C and SMBus I/O port
PCA9554A 8-bit I2C and SMBus I/O port
PCA9555 16-bit I2C-bus and SMBus I/O port
PCA9555A Low-voltage 16-bit I2C-bus I/O port
PCA9556 Octal SMBus Registered Interface
PCA9557 8-bit I2C and SMBus I/0 port with reset
PCA9559 5-bit multiplexed/1-bit latched 6-bit I2C EEPROM

PCA9550 Distributor