2-Bit I²C-Bus LED Driver with Programmable Blink Rates

Product Details

Select a section:

Block Diagram

Choose a diagram:

PCA9550 Block Diagram

PCA9550 Block Diagram

Block diagram: PCA9550D, PCA9550DP, PCA9550TK


  • 2 LED drivers (on, off, flashing at a programmable rate)
  • 2 selectable, fully programmable blink rates (frequency and duty cycle) between 0.172 Hz and 44 Hz (5.82 seconds and 0.023 seconds)
  • Input/output 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
  • 2 open-drain outputs directly drive LEDs to 25 mA
  • Controlled edge rates to minimize ground bounce
  • No glitch on power-up
  • Supports hot insertion
  • Low standby current
  • Operating power supply voltage range of 2.3 V to 5.5 V
  • 0 kHz 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 JEDEC Standard JESD78 which exceeds 100 mA
  • Packages offered: SO8, TSSOP8 (MSOP8), HVSON8


Quick reference to our documentation types.

1-5 of 15 documents

Show All

Design Resources

Select a section:

Design Files

3 design files

  • Models

    PCA9550 IBIS model

  • Symbols and Footprints

    PCA9550D-SO8-CAD Symbol and PCB Footprint – BXL File

  • Symbols and Footprints

    PCA9550DP-TSSOP8-CAD Symbol and PCB Footprint – BXL File


2 hardware offerings


What do you need help with?