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 I2 C Master’s (MCU, MPU, DSP, chipset, etc.) timer. The uniqueness of this device is the internal oscillator with two programmable blink rates.

FEATURES

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

•2 selectable, fully programmable blink rates (frequency and duty cycle) between 0.148 Hz and 38 Hz (6.74 and 0.026 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

•8 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: SO16, TSSOP16, HVQFN16