3.3.1.3.1 DEF_PTC_CAL_OPTION
This parameter determines whether the auto-tune charge time feature is enabled or not. When enabled, the auto-tune charge time feature helps to adjust the parameters to ensure full charging of the sensor electrode.
| Options | Description |
|---|---|
| CAL_AUTO_TUNE_NONE | This is the default value. The user configured Charge Share Delay (CSD), Prescaler and Resistor Select (RSEL) are used by touch library. |
| CAL_AUTO_TUNE_CSD* | Enabling this option will automatically adjust CSD and make sure that the sensor is fully charged. |
| CAL_AUTO_TUNE_PRSC* | Enabling this option will automatically adjust Prescaler and make sure that the sensor is fully charged. |
| CAL_AUTO_TUNE_RSEL* | Enabling this option will automatically select maximum internal resistor that can be used - based on sensor capacitance and given charge time CSD/Prescaler. |
CAUTION: * Auto-tune may not give the
accurate results under various conditions. So auto-tune option should not be used in
production. In self-capacitance measurement, autotune doesn’t work correctly.