What is the purpose of included Vref- pin in big packages(STM32F722IEK6). Can I provide negative voltage to it and measure +- signals with adc?

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Guru

Provides for a quieter ground return to the supply/regulator.

No, can't be negative relative to MCU, limits described in the data sheet for sure.

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Guru

Provides for a quieter ground return to the supply/regulator.

No, can't be negative relative to MCU, limits described in the data sheet for sure.

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Associate II

Is there other STM MCU that can measure +- signals?

Guru

No, perhaps better to use an external with better range/precision, or signal conditioning to compress into the range of the MCU

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Senior III

allows differential inputs.

absolutely cannot be negative, must be within the voltage limits for any pin.

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