DRV8305: About DRV8305 control signal pin's logic level & input current.

Hi Jacky,

1) When MCU output signal to DRV, how about  logic-level INPUT 's current? like INHA, INLA, INHB, INLB, INHC,....

Here is a diagram to better understand the INPUTs logic(INHA, INLA, .....)

The 100K ohm should not matter much when you are applying a logic low or logic high because it is so large of a resistance.

2) nFault & PWRGD pin is open drain. why here still has voltage maximum data? Does it mean it is not true open drain?

I agree with you, the spec is a little hard to understand, I will talk to my team and get you a clearer answer. The pin is an open drain output so it should have a logic high of a resistance number rather than a voltage number. 

3) Now DRV's VREG is power supplied by external 5V (Same with MCU). Whil SDO pin's minimum VOH is 2.4V. For 5V powered MCU, it will recognize signal as high levlel when input >0.7VDD (3.5V). Does it mean, here are some risk MCU will not identify high level when DRV output HIGH ~ 2.4V? 

I need to check with the rest of the team and get back to you.

Regards,

Michael

Michael,

Clearly, thanks.

Best regards

Jacky Xu