NXP Semiconductors PCA9551
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. This greatly increases the amount of traffic on the I2C-bus and uses up one of the master's timers.| Part No. | PCA9551 |
|---|---|
| Datasheet | PCA9551 Download |
| Manufacturer |  NXP Semiconductors |
| Description | 8-bit I2C LED driver |
| Buy | Stock & Price |
PCA9551 8-bit I2C-bus LED driver with programmable blink rates Rev. 08 — 31 July 2008 Product data sheet 1. General description 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. The PCA9551 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 o
