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Original question:

DRV8301: how does the fault pin gets activated in DRV8301 ??

DRV8301: what is the purpose of low side shunt???

vishnu thilack
Prodigy 60 points
Part Number: DRV8301

how the measured shunt current tells the driver if there is a dead short in the inverter leg???

if it is through a micro-controller the (SO1, SO2 inputs are given to a microcontroller) . to which pin of driver the microcontroller has to communicate saying there is dead short in inverter leg?????

while considering initial turn ON!!

and normal operating condition!!!

  • 0
    TI__Mastermind 26046 points

    Hi Vishnu,

    Thanks for posting to the MD forum!

    The DRV8301 uses VDS monitoring on the high-side and low-side MOSFETs to detect whether there is overcurrent in either the high side FET or low side FET. This can tell us if there is a short to GND since the excessive current will create a large voltage drop through the RDSON of the FET. This is done by measuring the difference between the drain and source pins of the MOSFET while its enabled. If the difference exceeds the programmed VDS threshold, the DRV8301 will detect an overcurrent event (OCP).

    Faults are communicated to the microcontroller through SPI. When a fault is generated, like an overcurrent condition, the corresponding bit for that fault is set in Status Register 1 or Status Register 2. The DRV8301 is a SPI slave device, so the microcontroller can read the Status Register by sending a 16-bit word to the SDI pin. The SDO pin will return a 16-bit word to the microcontroller that provides the status of the registers.