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STM32G0x Negative Voltage on Pins and internal diodes

danielbathtub
Associate II

Hi, 

Does anyone have any experience with negative voltage signals on STM32G0x ADC input pins ?. 

Off course I am aware of circuit designs which deal with negative voltages using diodes ect. ect. 

Is it recommended by ST Microelectronics to desgin a circuit where current will be flowing out of an ADC input pin (even if the current is limited to <5mA) due to a Voltage of < -0.3 V applied to that Pin, while an ADC conversion is done on another Analog Voltage input pin. ?. 

So the design repeatedly and consistently causes the parasitic FET Diodes within the IO to conduct. Does this affect the reliability of the device ?. 

 

Thanks 

 

1 REPLY 1
TDK
Guru

Limits on undervoltage are described in the datasheet in the Absolute maximum ratings section.

https://www.st.com/resource/en/datasheet/stm32g030c6.pdf

In general:

  • Don't put negative voltages on pins, but if you have to:
  • Voltages above -0.3 V can be okay.
  • Injected current of < 5 mA can be okay.

TDK_0-1706886748647.png

 

> Does this affect the reliability of the device ?. 

Yes, as stated in the absolute max ratings section.

TDK_1-1706886826918.png

 

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