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TMS320F280049: F280049 ADC Questions

Todd Anderson78572
Guru 14640 points
Part Number: TMS320F280049

All:

I know on the F2837x, the ADCs all share ADC14 and ADC15,

On the F28004x, I am using an external 3 volt reference for ADCA, ADCB, and ADCC.

Question:

If I use A0/B15/C15 input to measure a fixed voltage (in our case 2.5 volts), can I read the value on ADCA without having to deselect B15 and C15?

Ideally, I would like to set up all 3 ADCs and input the fixed voltage without having to "deselect" - is that possible? (and am I making sense?)

  • 0
    TI__Mastermind 37790 points
    Hi Todd,

    Yes, that makes sense. In F28004x, channels A0/B15/C15 are all internally connected and you would not have to deselect the channels. You need to configure it though depending on the ADC module being used. If ADCA, channel has to be set as AdcaRegs.ADCSOCxCTL.bit.CHSEL = 0. If ADCB, channel has to be set as AdcbRegs.ADCSOCxCTL.bit.CHSEL = 15, and if ADCC, channel has to be set as AdccRegs.ADCSOCxCTL.bit.CHSEL = 15.

    Best regards,
    Joseph