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�?VNH5019ATR-E】Motor Control IC Technical Question Can you please answer the questions in red and red boxes in the attached schematic?

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KIshi.3
Associate

‎2021-03-28 8:04 PM

 
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Peter BENSCH
ST Employee

‎2021-03-29 5:14 AM

Welcome, @KIshi.3​ , to the comminity!

I'll just repeat the questions to make them easier to read:

Is it possible that -1.5V is applied to the CPU for all IN, OWM, DIAGx/ENx?

  • Yes, in case of negative transients it is possible that -1.5V will be present on all control pins.

Does this countermeasure rely on the parasitic diode protection of the CPU?

  • There are parasitic p-n junctions (diodes) at the MCU pins, but they are usually not intended to be used for protection. The protection resistor Rprot on the one hand limits the current for such a negative transient at Vbat and on the other hand protects the controlling MCU from latching-up.

Are there any pull-down resistors in each input port?

  • If you mean the input pins of the VNH5019ATR-E: no, there are no pull resistors.

Regars

/Peter

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Peter BENSCH
ST Employee

‎2021-03-29 5:14 AM

Welcome, @KIshi.3​ , to the comminity!

I'll just repeat the questions to make them easier to read:

Is it possible that -1.5V is applied to the CPU for all IN, OWM, DIAGx/ENx?

  • Yes, in case of negative transients it is possible that -1.5V will be present on all control pins.

Does this countermeasure rely on the parasitic diode protection of the CPU?

  • There are parasitic p-n junctions (diodes) at the MCU pins, but they are usually not intended to be used for protection. The protection resistor Rprot on the one hand limits the current for such a negative transient at Vbat and on the other hand protects the controlling MCU from latching-up.

Are there any pull-down resistors in each input port?

  • If you mean the input pins of the VNH5019ATR-E: no, there are no pull resistors.

Regars

/Peter

In order to give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.
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