SLVSE17A May 2019 – April 2020 TPS1HB16-Q1
The ground protection network will cause the device ground to be at a higher potential than the module ground (and microcontroller ground). This offset will impact the interface between the device and the microcontroller.
Logic pin voltage will be offset by the forward voltage of the diode. For input pins (for example, EN), the designer must consider the VIH specification of the switch and the VOH specification of the microcontroller. For a system that does not include DGND, it is required that VOH > VIH. For a system that does include DGND, it is required that VOH > (VIH + VF). VF is the forward voltage of DGND.
The sense resistor, RSNS, should be terminated to the microcontroller ground. In this case, the ADC can accurately measure the SNS signal even if there is an offset between the microcontroller ground and the device ground.