8.3.6.4.1 OTUT DAC Measurmenent

This mode is intended for OTUT DAC reference (detection threshold level) measurement in the AUX ADC. The sequence listed below should be followed for proper measurements. If OTUT is transitioned to the enabled state after the AUX ADC input is enabled and OTUT is set to single mode, the OTUT logic masks the output from the comparators. This ensures the DAC outputs only the detection threshold level during the ADC measurement. Transitioning the OTUT enable bit from disabled to enabled latches the mode configuration signals, therefore it is required whenever a configuration change is requested.

1. Set ADC input enable (OT_DAC_EN=1 or/and UT_DAC_EN=1 in AUX_ADC_CTRL2)
2. Set OTUT in single channel (set OTUT_MODE in DIAG_CTRL1 to 0b10)
3. Set at least one of channel enable (GPIO1_EN=1 in OTUT_CTRL for example)
4. Set OTUT disable (OTUT_EN =0 in CONTROL2 ) if it is already enabled
5. Set OTUT enable (OTUT_EN=1 in CONTROL2 )
6. Enable TSREF (TSREF_EN=1 in CONTROL2)
7. wait for TSREF to settle
8. Start AUX ADC conversion (AUX_ADC_GO=1 in CONTROL2)
9. Wait for AUX ADC to finish
10. Re-configure OTUT as required.