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ADS122U04: MSP low-power microcontroller forum

maniram nagothi
Intellectual 260 points
Part Number: ADS122U04

hi ,

i want to validate the ADS122U04 ADC functionality.

i know that the RTD has 2 modes : single shot mode and continuous mode.

i had written my test code with respective to this modes.

so, can u please share the details like:

how can i test single shot conversion mode?

how can i test continuous conversion mode?  

for testing the continuous conversion mode, what can be the inputs given and what could be the corresponding output for the given inputs?   

Thank you,

Maniram

  • 0
    TI__Guru** 113765 points

    Hi Maniram,

    From the brief description you have given, it sounds like you are trying to make a temperature measurement using an RTD.  Information regarding connection, calculation and methodology of an RTD measurement is shown in the ADS122U04 datasheet Application section 9.2.2.  This information should help you know how to connect the RTD to the ADS122U04 as well as making the conversion.

    To start either single-shot or continuous conversion mode you need to send the START/SYNC command (only the first time when using continuous conversion mode).  Selection of which mode you wish to use is done through a register write (WREG) to the Configuration 1 register CM bit.  The default mode is single-shot.  Once the conversion has completed, you can use the RDATA command to read the conversion result.

    All commands sent to the ADS122U04 require the synchronization word (0x55) to precede any command. You cannot send and receive at the same time or the device will require a reset.  All communication is 8 bit binary and not ASCII.

    Best regards,

    Bob B