• Qualified for Automotive Applications
• I2C to Parallel Port Expander
• Low Standby-Current Consumption of 3μAMax
• Open-Drain Active-Low Interrupt Output
• Active-Low Reset Input
• 5-V Tolerant I/O Ports
• Compatible With Most Microcontrollers
• 400-kHz Fast I2C Bus
• Input/Output Configuration Register
• Polarity Inversion Register
• Internal Power-on-Reset
• No Glitch on Power Up
• Noise Filter on SCL/SDA Inputs
• Address by Two Hardware Address Pins for Use of up to Four Devices
• Latched Outputs With High-Current Drive Capability for Directly Driving LEDs
• Latch-Up Performance Exceeds 100mA Per JESD78, ClassII
• ESD Protection Exceeds JESD22
  • 2000-V Human-Body Model (A114-A)
  • 1000-V Charged-Device Model (C101)

• Automotive infotainment, Advanced Driver Assistance Systems (ADAS), Automotive body electronics, HEV/EV & Powertrain
• Industrial automation, Factory automation, Building automation, Test & measurement, EPOS
• I2C GPIO expansion

The TCA9539-Q1 is a 24-pin device that provides 16 bits of general purpose parallel input/output (I/O) expansion for the two-line bidirectional I2C bus (or SMBus protocol). The device can operate with a power supply voltage (VCC) range from 1.65 V to 3.6 V. The device supports 100-kHz (I2C Standard mode) and 400-kHz (I2C Fast mode) clock frequencies. I/O expanders such as the TCA9539-Q1 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 TCA9539-Q1 include an interrupt that is generated on the INT pin whenever an input port changes state. The A0 and A1 hardware selectable address pins allow up to four TCA9539-Q1 devices on the same I2C bus. The device can be reset to its default state by cycling the power supply and causing a power-on-reset. Also, the TCA9539-Q1 has a hardware RESET pin that can be used to reset the device to its default state.

The TCA9539-Q1 I2C I/O expander is qualified for automotive applications.