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florian_loeff
Level 1
Level 1
5 sign-ins First reply posted First question asked

Hello,

I have a question regarding the nBRAKE signal on the IMD701A.

In the figure 26 of the IMD701A Datasheet the signal is driven by a pullup to high.
In the figure 67 of the IMD701A Datasheet it looks the way that the gate driver can pull this line low.
We would also like to pull the line low from outside in case of emergency.

Now the question is what happens if the XMC1404 Pin is configured as output high by mistake or software bug?
Is the high side driver of the Pin P1.3 deaktivated in this chip? Or may occur damage if P1.3 drives high and the gatedriver or an external device pulls the nBRAKE line low?

Thanks in advance,

Florian

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1 Solution
Vinay
Moderator
Moderator
Moderator
50 solutions authored 100 replies posted 250 sign-ins

Dear @florian_loeff,

Good Day!

Thanks for posting your question in Infineon community.

 

Sorry for the delay in response.

when nBrake is pulled down from an external microcontroller and nBrake is high from internal XMC1404 controller, then brake operation shall happen. Brake happens if nBrake is pulled down either from an external controller or from internal XMC1404.

 

Thank you!

 

Best Regards,
Vinay

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2 Replies
Vinay
Moderator
Moderator
Moderator
50 solutions authored 100 replies posted 250 sign-ins

Dear @florian_loeff,

Good Day!

Thanks for posting your question in Infineon community.

 

Sorry for the delay in response.

when nBrake is pulled down from an external microcontroller and nBrake is high from internal XMC1404 controller, then brake operation shall happen. Brake happens if nBrake is pulled down either from an external controller or from internal XMC1404.

 

Thank you!

 

Best Regards,
Vinay
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florian_loeff
Level 1
Level 1
5 sign-ins First reply posted First question asked

Hello Vinay,

thanks fo replying. The described behavior would apply if the internal XMC Pin is configured as open drain pin.

What happens if the pin is accidently configured as push pull and outputs high level? 
A external device pulling the nBrake low would then short circuit the high swiched pin to ground.

Is braking still reached or is the behavior undefined?

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