8.3.6 GPIO Operation

The TCA5013 has four 5 V tolerant open drain GPIO pins that can be configured as inputs or outputs through device settings register (Reg 0x42). If configured as outputs, each is capable of sinking up to 10mA of current. If configured as inputs they will assert the INT line when a state change occurs on the pin. The minimum pulse width for transition detection is 10 µs, that is, when a state transition occurs on a GPIO configured as an input, it needs to hold its state for a minimum of 10 µs in order to guarantee detection by the TCA5013. This, however, does not imply any glitch rejection on the GPIO pins. The GPIOs are available in Standby Mode and Active Mode. GPIO state transitions are not tracked in shutdown mode.