DRV8825 motor driver sense resistor wattage rating.

  1)  To determine the wattage rating of the sense resistor, What percentage of the phase current flows thru the current sense resistor?  1/5 th since the sense gain=5V/V?  

2) What is the significance of the xISENSE trip voltage, 660mV?  Related to calculating the sense resistance?

Thanks, Dale!