The TPS65981 ADC is shown in Figure 9-44. The ADC is a 10-bit successive approximation ADC. The input to the ADC is an analog input multiplexer that supports multiple inputs from various voltages and currents in the device. The output from the ADC is available to be read and used by application firmware. Each supply voltage into the TPS65981 is available to be converted including the port power path inputs and outputs. All GPIO, the C_CCn pins, the charger detection voltages are also available for conversion. To read the port power path current sourced to VBUS, the high-voltage and low-voltage power paths are sensed and converted to voltages to be read by the ADC. For the external FET path, the difference in the SENSEP and SENSEN voltages is converted to detect the current (I_PP_EXT) that is sourced through this path.

Figure 9-44 SAR ADC