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MSP430FR2355: ADC in Sequence-of-Channels Mode ADCCONSEQx = 01

d_zero
Genius 4490 points
Part Number: MSP430FR2355

Dear *,

we have analog inputs connected to A8 A9 and A3 of MSP430FR2355, and we want to do a sequence of ADC conversion : first A8 then A9 and then A3.

Is this possible to do with MSP430FR2355 and  ADCCONSEQx 01b = Sequence-of-channels ?

We want to have a timer, and when the timer makes the interrupt we want to do the three conversions.

Best Regards,

David.

  • 0
    Guru 88700 points

    Short answer: No, at least not as stated.

    CONSEQ=1 always counts down from INCH->A0, in your case A9->A0. [Ref User Guide (SLAU445I) Sec 21.2.7.2]

    One option is to go ahead and do all the conversions, and pick out the ones you want. The small sips of current the ADC samples should not be enough to interfere with digital pins.

    Keeping in mind that (with MSC=1) you have to run the ADC slow enough to grab each sample, it might be quicker to just do three individual conversions with CONSEQ=0.

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