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Texas Instruments TCA9554/A Remote 8-bit I2C & SMBus I/O Expander

Texas Instruments TCA9554/A Remote 8-bit I2C & SMBus I/O Expander provides 8 bits of general-purpose parallel input/output (I/O) expansion for the two-line bidirectional I2C bus (or SMBus) protocol. Each device can operate with a power supply voltage ranging from 1.65V to 5.5V. It supports both 100kHz (Standard-mode) and 400kHz (Fast-mode) clock frequencies. These I/O expanders from Texas Instruments provide a simple solution when additional I/Os are needed for switches, sensors, push buttons, LEDs, fans, and other similar devices. The features of the TCA9554 include an interrupt that is generated on the INT pin whenever an input port changes state. The A0, A1, and A2 hardware selectable address pins allow up to eight TCA9554/A devices on the same I2C bus.

Features

  • I2C to parallel port expander
  • Open-drain active-low interrupt output
  • 1.65V to 5.5V operating power-supply voltage range
  • 5V tolerant I/O ports
  • 400kHz fast I2C bus
  • Three hardware address pins allow up to eight devices on the I2C/SMBus
  • Input and output configuration register
  • Polarity inversion register
  • Internal power-on reset
  • Low standby current consumption
  • Power-up with all channels configured as inputs
  • No glitch on power up
  • Noise filter on SCL/SDA inputs
  • Latched outputs with high-current drive maximum capability for directly driving LEDs
  • Latch-up performance exceeds 100mA per JESD 78, Class II
  • ESD Protection Exceeds JESD 22
    • 2000V human-body model (A114-A)
    • 1000V charged-device model (C101)

Applications

  • Servers
  • Routers (telecom switching equipment)
  • Personal computers
  • Personal electronics (gaming consoles)
  • Industrial automation
  • Products with GPIO-limited processors

Functional Block Diagram

TI Reference Designs - Texas Instruments TCA9554/A Remote 8-bit I2C & SMBus I/O Expander
Published: 2015-07-09 | Updated: 2022-03-11