13.20.2 MOSFET Gate Driver Undervoltage Lockout (UVLO)

The MOSFET Gate Driver Undervoltage Lockout Fault detection monitors the available voltage used to drive the external MOSFET gates. The Fault detection is only active while the driver is actively driving the external MOSFET gate. Any time the driver bias voltage is below the gate drive Undervoltage Lockout Threshold (V_DUVLO) for a time longer than specified by the t_DUVLO parameter, the driver will not turn on when commanded on. A driver Fault will be indicated to the host dsPIC DSC on the FAULT open-drain output pin and also via a DE2 communications Status_1 message. This is a latched Fault. Clearing the Fault requires either removal of device power or disabling and re-enabling the device via the device Output Enable (OE) input. The EXTUVLO bit in the CFG0 register is used to enable or disable the driver Undervoltage Lockout feature. This protection feature prevents the external MOSFETs from being controlled with a gate voltage not suitable to fully enhance the device.