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LAUNCHXL-F28069M: Configure ADC for measuring differential inputs

Mehran Mustafa
Prodigy 20 points
Part Number: LAUNCHXL-F28069M
Other Parts Discussed in Thread: TIDA-00555, AMC1100

Hello,

I am using the TI reference design TIDA-00555, which is for Isolated Current and Voltage measurement. I am using that board to measure current and voltage and interfacing that with the ADC of the C2000 F28069 launchpad. I just want to know whether I can configure the microcontroller on the launchpad to measure differential inputs? The reference design outputs differential values of the voltage and current measurement using the AMC1100 differential amplifier. If yes, then please let me know where I can access this info.

Can I do this using CCS in MATLAB/Simulink?

Thank you!

  • 0
    TI__Genius 17315 points
    Mehran,

    The F28069 ADC does not support differential mode. However, the F2837x ADCs do support 16-bit differential mode - either the F28377S or F28379D LaunchPads.

    I hope this helps. If this answers your question, please click the green "Verified Answer" button. Thanks.

    - Ken
  • 0 in reply to Ken Schachter
    Prodigy 20 points

    Thank you Ken for your prompt response. I checked F28377S and it says it is obsolete. I will go for F28379D though. Is there literature available to know how to configure it to accept differential input? Also, could you help me with some literature on how to code it for differential input (for example voltage differential input signal)?

    Thank you!

  • 0 in reply to Mehran Mustafa
    TI__Genius 17315 points

    Mehran,

    You are better off with the F28379D LaunchPad for a variety of reasons, and you can also use it as a single core, making it similar to the F28377S (hence the reason the F28379D LaunchPad replaced the F28379D LaunchPad).  The only information we have on the ADC 16-bit differential mode is in the F28379D data sheet and Technical Reference Manual.  As far as software, there is not really much to change except the resolution setting in the call to “AdcSetMode“ function.  Please see my diagram below (and attached) :

    Also, you might be interested in the following workshop, and see module/lab 6 for details on the ADC:

    http://processors.wiki.ti.com/index.php/C2000_Multi-Day_Workshop

    I hope this helps.  If this answers your question, please click the green "Verified Answer" button.  Thanks.

    - Ken