Modern infotainment head units, digital cockpit platforms, and ADAS systems integrate displays, serializers and deserializers, image sensors, and other peripherals that require low-speed control and status monitoring. GPIO expanders simplify this integration by offloading enable, reset, and mode-select signals from the main SoC.

The TCA9539A-Q1 is typically connected to the infotainment or ADAS SoC via I2C and used to control peripheral enable pins and monitor fault or status signals as shown in Figure 4-2. Wide supply-voltage range (1.65V to 5.5V) supports mixed-voltage architectures commonly found in automotive platforms. The interrupt feature allows prompt detection of peripheral state changes, while the reset pin enables deterministic system startup.

The device integrates easily with SoCs from TI (TIDEP-01008 reference design, Efficiently Driving Automotive Dashboard Loads With TPS1HC100-Q1), as well as other popular vendor (and reference designs) for Infotainment and ADAS, and can be paired with I2C level translators or buffers as needed for multi-voltage systems.