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SM320F2812-HT: AD reference voltage

Ben Qin
Intellectual 2685 points
Part Number: SM320F2812-HT
Other Parts Discussed in Thread: SM320F2812

Hi Team，

There's an issue from the customer need your help:

The SM320F2812 chip has 12-bit precision AD. The calculation formula of this AD is based on 3V as a reference, but the power supply is 3.3V. The power supply voltage here is reduced from 3.3V to 3.2V due to temperature. Will it affect the AD collection data? I looked for the data sheet, but I couldn't find what specific AD is used as a reference voltage.

Could you help check this case?

Thanks & Regards,

Ben

  • 0
    TI__Guru 74730 points

    Ben,

    The internal ADC reference is independent of the supply voltage(internal band gap source); so long as the customer stays in the spec for VDDIO/VDDA the ADC will perform within spec in the DS; and the full scale range will always be 0-3V. 

    So, there will be no impact to the ADC results based on the customer use case mentioned above.

    Best,

    Matthew