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DRV8332: Sense resistors on GND_X pins.

Part Number: DRV8332

Sense resistors are mentioned in 8.4.1, pictured in Figure 8 typical application diagram and described once again in 9.2.1.2.5

Are these user-specific sense resistors or are they required for the DRV8332's operation on its own? Are they related to the overcurrent protection of the device? I would like to know if they are strictly necessary or not. 

Thanks,
Shaun