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ADS1247EVM: ADS1247 EVM Current chopping

user5942866
Prodigy 70 points
Part Number: ADS1247EVM
Other Parts Discussed in Thread: ADS1247, ADCPRO, MSP430F5529

Hi all,

I am setting up a temperature measurement with the ADS1247  EVM and PDK and a PT1000 in ratiometric setup (See TI document SLAU520A - 3-Wire RTD Measurement System Reference Design, -200°C to 850°C).

Visualising the  data with ADCPro works properly, but I would like to make use of current chopping capability of this adc. Unfortunately the chopping functionality is not implemented in the GUI of ADCPro... So is there a way to implement the chopping with the EVM and PDK board? Or do I have to implement my own SPI communication?

Thanks for the help in advance

Kind regards, Dominik

  • 0
    TI__Guru** 113765 points

    Hi Dominik,

    To do IDAC chopping with the EVM and EVM firmware/ADCPro would be a rather complicated procedure due to all of the possible combinations.  ADCPro communicates to the ADS1247EVM-PDK via terminal/console commands and you could try experimenting with a console script to issue a series of commands.  This wouldn't be an exact method due to asynchronous timing.  The documentation on the communication is given in a word document that is in a folder installed when the plugin was installed.  The file is called "CONSOLE COMMANDS FOR ADS1247EVM.doc" and is in the folder:

    C:\Program Files (x86)\ADCPro\plugins\evm\ADS1247\documentation

    Unfortunately we cannot share the specific firmware used on the EVM due to a number of issues including licensing.  Another method would be to start with the example software code project:  

    http://www.ti.com/lit/zip/sbac144

    This project is based on the MSP430F5529 and uses a similar approach as the EVM firmware.  The MSP430 LaunchPad using the MSP430F5529 could be used to fly-wire the SPI signals from the LaunchPad to the EVM.  The code should be easily adaptable to what you want to do.

    Best regards,

    Bob B