• AEC-Q100 (Grade 1): Qualified for automotive applications
• Functional Safety-Capable
  • Documentation available to aid in functional safety system design
• I²C to parallel port expander
• Open-drain active-low interrupt output
• Active-low reset input
• 5 V tolerant input and output ports
• Compatible with most microcontrollers
• 400 kHz Fast I²C bus
• Polarity inversion register
• Internal power-on reset
• No glitch on power up
• Address by two hardware address pins for use of up to four devices
• Latched outputs for directly driving LEDs
• Latch-up performance exceeds 100 mA Per JESD 78, class II
• ESD protection exceeds JESD 22
  • 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 and powertrain
• Industrial automation, factory automation, building automation, test and measurement, EPOS
• I²C GPIO expansion

The TCA9539-Q1 is a 24-pin device that provides 16 bits of general purpose parallel input and output (I/O) expansion for the two-line bidirectional I²C bus (or SMBus protocol). The device can operate with a power supply voltage (V_CC) 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.