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TPIC6A595 LGND-PGND voltage specification

Other Parts Discussed in Thread: TPIC6A595, TPIC6B595

Dear all,

This is my first post at the TI E2E forum, so I hope don't offend too many forum etiquette rules.

I'm considering using the TPIC6A595 as the column current sink for the motor-matrix in a vending machine.
The motor's current drops briefly to zero on a full rotation and this current drop should be measured.

As the TPIC6A595 has a seperate PGND, this measurement could simply be done with a voltage drop over a small resistor.
This would also cause a voltage difference between LGND and PGND.

I've searched the datasheet to find a specification of the maximum allowed voltage between LGND and PGND, this spec could aid me in selecting the appropriate shunt resistor. I'm guessing a too high voltage drop between LGND and PGND would cause trouble with the gate drive of the power FET.

Could anyone give me some guidance or a specification?

Thank you in advance and best regards,