SPRUIM2H May 2020 – October 2023 AM2431 , AM2432 , AM2434 , AM6411 , AM6412 , AM6421 , AM6422 , AM6441 , AM6442
The ADC function can be validated by measuring known reference voltage sources. This feature provides register control that connects the AFE to known reference voltage sources. However, it does not automatically configure the FSM to perform conversions to measure these sources. Software will need to configure the FSM to perform a measurement after selecting this mode of operation.
ADC_CONTROL[10] HI_MID_EN is used to disconnect the AFE from all analog inputs and connect it to one of two known reference voltage sources. ADC_CONTROL[11] HI_MID_SEL is used to select REFP or VMID as the known reference voltage source.
The conversion results is expected to produce a full scale value when the AFE is connected to REFP and approximate half scale value when the AFE is connected to VMID.
The steps are: