SBOS848B December 2017 – October 2019 INA381
The device is set to transparent mode when the RESET pin is pulled low, allowing the output alert state to change and follow the input signal with respect to the programmed alert threshold. For example, when the differential input signal exceeds the alert threshold, the alert output pin is pulled low. When the differential input signal drops to less than the alert threshold, the output returns to the default high-output state. A common implementation using the device in transparent mode is to connect the ALERT pin to a hardware interrupt input on a microcontroller. When an overcurrent condition is detected and the ALERT pin is pulled low, the controller interrupt pin detects the output state change and begins making changes to the system operation required to address the overcurrent condition. Under this configuration, the ALERT pin high-to-low transition is captured by the microcontroller, and the output returns to the default high state when the overcurrent event is removed.