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Why use an N channel MOSFET to connect GND

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ilium007:
Hi - I came across this Freescale MC33926 breakout from Pololu and found this in the schematic. The numerous GND pins on the SMD package are connected to GND via an N channel MOSFET triggered by Vin. I am wondering why these pins aren't just tied direct to a GND plane on the PCB ?

I am starting out with electronics design and wondered why the designer may have chosen to go this way ?

tsman:

--- Quote ---The carrier board has a reverse-protection MOSFET for added protection to the motor driver chip.
--- End quote ---

retrolefty:




I suspect it's to properly sequence powering up to prevent glitches on the output drivers.

bson:
Note that the source pin is on the top and drain on the bottom, and it connects GND to Earth/Chassis.

Mr.B:

--- Quote from: tsman on March 10, 2019, 01:26:55 am ---
--- Quote ---The carrier board has a reverse-protection MOSFET for added protection to the motor driver chip.
--- End quote ---

--- End quote ---

This...^

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