If the voltage across the heater driver V_DS overcurrent comparator exceeds the V_{DS_LVL_HEAT} for longer than the t_{DS_HEAT_DG} time, a heater overcurrent condition is detected. The voltage threshold and deglitch time can be adjusted through the EC_CNFG and HEAT_CNFG register settings.

There is also a heater MOSFET V_DS monitor blanking period that is configured in bit HEAT_VDS_BLK in register HEAT_CNFG. There are four blanking time options:

The heater overcurrent monitor can respond and recover in four different modes set through the HEAT_VDS_MODE register setting.

• Latched Fault Mode: After detecting the overcurrent event, the gate driver pull-down is enabled and HEAT_VDS is asserted. After the overcurrent event is removed, the fault state remains latched until CLR_FLT is issued.
• Cycle by Cycle Mode: After detecting the overcurrent event, the gate driver pull down is enabled and HEAT_VDS, EC_HEAT and FAULT bits are asserted. EC_HEAT and FAULT status bit in register IC_STAT1 will remain asserted until driver control input change (SPI or PWM). In order to clear HEAT_VDS bit, a CLR_FLT command must be sent after an input change. If CLR_FLT is issued before an input change, all thre status bits remain asserted and driver pull-down will stay enabled.
• Warning Report Only Mode: The heater overcurrent event is reported in the WARN and HEAT_VDS bits. The device will not take any action. The warning remains latched until CLR_FLT is issued.
• Disabled Mode: The heater V_DS overcurrent monitors are disabled and will not respond or report.