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MSP430FR2433: Some doubts on MSP430FR2433

SeaFesse
Expert 2690 points

Part Number: MSP430FR2433

Hi TI guys,

  I was confused by user guider of MSP430FR2xxFR4xx.  Need your help.

  1) The bulit-in reference in  ADC10  is 1.2V   or  1.5V ?

  2) ADC10 only have one ADCMEM0, so when we chose "Sequence of channels" or " Repeat sequence of channels".  How to avoid the conversion result is not read yet and covered by the following

  channel ADC result? After all, it don't have DMA or DTC(like F2xx series)?

 3) How can I tell the ADC result in ADCMEM0 is come from which sample channel? A2？ A1? A0 ？

Thanks.

    SeaFesse.

  • 0
    TI__Intellectual 2115 points

    Hi SeaFesse,

    Answering your questions:

    1. The reference 1.5V is used as ADC reference, while the 1.2V is output to the VREF+ pin. For FR2433, it's P1.4/UCA0TXD/UCA0SIMO/TA1.2/TCK/A4/VREF+.

    2. You are right. User needs to readout the result before conversion completion of next channel in sequence mode. Sorry for the inconvenience since there is no DMA/DTC in FR2xx/4xx family devices.

    3. You can tell the channel # by reading ADCMCTL0.ADCINCHx bits in sequence mode. See below figure from User's Guide.

    Hope this help.

    Regards,

    Harry

  • 0
    Guru 103285 points
    A bit more:
    2) You can expand the window by (a) slowing down the ADC clock (b) adding more SHT clocks or (c) setting MSC=0 and using a timer trigger. For what I do, I prefer (c).
    3) INCH as read after the conversion is complete reflects the Next channel to be converted, so it's off-by-one. (And be careful when it's =0.)
  • 0 in reply to Bruce McKenney
    Expert 2690 points

    Bruce McKenney47378 said:
    A bit more:
    2) You can expand the window by (a) slowing down the ADC clock (b) adding more SHT clocks or (c) setting MSC=0 and using a timer trigger. For what I do, I prefer (c).
    3) INCH as read after the conversion is complete reflects the Next channel to be converted, so it's off-by-one. (And be careful when it's =0.)

    Thanks for your experience, Bruce. :)

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