In addition to the wetting current diagnostic, another feature– the ADC self-diagnostic, can be enabled to monitor the integrity of the internal ADC.

The ADC self-diagnostic feature is activated by setting the ADC_DIAG_T bit in the CONFIG register to logic 1. Once enabled, the TIC12400-Q1 periodically sends a test voltage to the ADC. The conversion result is stored in the ADC_SELF_ANA bits in the register ANA_STAT12 and is compared with a pre-defined code to determine whether the conversion is performed properly. If an error is detected, the TIC12400-Q1 pulls the INT pin low to notify the host and flag the ADC_DIAG bit in the INT_STAT to logic 1. The bit ADC_D in register IN_STAT_MISC is updated with the result from the self-diagnostic. The ADC self-diagnostic feature is available in both continuous mode and polling mode.