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MSPM0G3519: MSPM0G3519 : BUFCONFIG config register for ADC using external reference

Khanh Doan
Prodigy 70 points
Part Number: MSPM0G3519


Hi TI Team,

Currently I'm working on ADC topic with external voltage reference in my project. I have one question that I'm using 3.6V as external voltage reference for ADC , and I select external ref as configuration, with ADC 10 bit resolution => I understand that the ADC will scale with Vref = 3.6 V, right ? (3.6V is equivalent to 1023). Is the configuration of BUFCONFIG in CTL0 affects to this value ? Because I saw that there is only 2 options 1.4V and 2.5V. I don't know how this will affecto the result.

  • +1
    TI__Mastermind 27655 points

    Hi Doan,

    Khanh Doan said:
    with ADC 10 bit resolution => I understand that the ADC will scale with Vref = 3.6 V, right ? (3.6V is equivalent to 1023).

    Yes.

    Khanh Doan said:
    (3.6V is equivalent to 1023). Is the configuration of BUFCONFIG in CTL0 affects to this value ? Because I saw that there is only 2 options 1.4V and 2.5V.

    The 1.4V and 2.5V option is used for internal VREF. If users select external VREF, the internal VREF is disabled.

    Meanwhile, what your VDD voltage level? If you set VDD=3.3V and VREF=3.6V, I think it not safety as it is the ABS MAX ratings. If your VDD is also 3.6V, it is fine.

    B.R.

    Sal