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MSP430FE4232 and AC voltage

Keorapetse Mogajane
Prodigy 90 points

I was looking at the datasheet to see how to handle or adjust my voltage so that no negative voltage is applied to the inputs of the ESP430. But I noticed that there is nothing like that done. I it safe for me to apply AC to the analog inputs and exactly what is the maximum negative voltage that the chip can handle?

  • 0
    Guru 227245 points

    The FE devices (and only those) accept a negative input voltage for the ADC. Differential Input must be in the range of +-0.6V and needs to be within +-0.5V (peak value, not RMS) to be within the specified performance range.
    Absolute input limits are AVSS-1V to AVcc. So applying +-0.5V absolute AC voltage is fine.

    The other MSPs (non-FE) accept only AVss-0.1V and cut off any negative offset.

    Keep in mind that AVss must not be lower than DVss-0.2V (and should be equal to DVss)

    See page 29 of the device datasheet SLAS616.pdf

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