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Current Sense circuit for Back EMF measurement for sensorless BLDC motor control

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gauravmp:
Hi, I'm working on a sensorless BLDC motor controller and I intend to use the DRV8305 (http://www.ti.com/lit/ds/symlink/drv8305.pdf) for my FET drivers for the motor. I have been looking at their example application (page 45) as shown in the picture attached. I'm trying to figure out what the zener diode in this circuit is used for. Any help would be appreciated. The PVdd will be 12V and the Vcc will be 3.3V.

[ Specified attachment is not available ]

KaneTW:
It's just input protection. Also a Schottky, not a Zener.

gauravmp:
Oh thanks a lot!

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