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DRV8323R: ENABLE pin as safety feature

Part Number: DRV8323R

Hello,

I'm currently developing a device that has to meet some specific safety requirements, one of which is the inability of the microcontroller to control actuators without a physically pressed button. I'd like to connect the button signal to the enable pin of the DRV, but I have to be sure that the enable pin is implemented purely in hardware. So basically my question is if the enable pin is a hardware solution or is it dependent on the smart drive unit? Is the smart driver unit a pure hardware solution as well? 

Best Regards,

Piotr Wasilewski