ZHCS276F September 2011 – February 2025 DRV8818
PRODUCTION DATA
If the current through any FET exceeds the preset overcurrent threshold, all FETs in the H-bridge are disabled for a period of approximately 800μs, or until the ENABLEn pin has been brought inactive high and then back low, or power is removed and reapplied. Overcurrent conditions are sensed in both directions; that is, a short to ground, supply, or across the motor winding all result in an overcurrent shutdown.
Note that overcurrent protection does not use the current sense circuitry used for PWM current control and is independent of the Isense resistor value or VREF voltage. Additionally, in the case of an overcurrent event, the microstepping indexer is reset to the home state.