This is breakout board that provides 8 bits of general purpose parallel input and output expansion for I2C bus (or SMBus) protocol when additional I/Os are required for LEDs, sensors, switches etc.

Features:

• Low Standby Current Consumption
• I2C to Parallel Port Expander
• Open-Drain Active-Low Interrupt Output
• Active-Low Reset Input
• Operating Power-Supply Voltage Range of 1.65 V to 5.5 V
• 5-V Tolerant I/O Ports
• 400-kHz Fast I2C Bus
• Two Hardware Address Pins Allow up to Four Devices on the I2C/SMBus, predefined 0x70 address via zero resistors
• Input and Output Configuration Register
• Polarity Inversion Register
• 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

Technical details:

• Mfr. Part No.: Texas Instruments TCA9538PWR
• 0.1" (2.54mm) Pitch Harwin M20 8 Pins Vertical Gold Headers (2 pcs)
• Designed and Assembled in London, UK

MCU Library Support:

• GitHub: ClosedCube TCA9538 Arduino Library

See also:

• LTC4310 Hot-Swappable I2C Isolator
• LTC4317 Dual I2C/SMBus Hardware Address Translator