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Original question:

FDC2214EVM: Synchronize several EVM's to a computer or a data logger

FDC2214EVM: Connect FDC2214EVM to a datalogger via J3?

Hongliang Qian
Prodigy 210 points
Part Number: FDC2214EVM
Other Parts Discussed in Thread: FDC2214

Hi,

If I cannot connect multiple FDC2214EVMs to a computer to read capacitance simultaneously via GUI, is it possible to connect some EVMs to a datalogger via J3 to read capacitance? Then I can use VEE/LabView to read the signals.

Thanks you in advance,

Hongliang

  • 0
    TI__Genius 17440 points
    Hi Hongliang,

    If you use J3 to communicate with the EVM, you should break off the MCU section of the board. The EVMs are designed so that this section can easily break off and people can experiment with different MCUs. If you do this, you will need to connect an I2C master to J3 to control the FDC2214. Unless the master reads data from the FDC2214 registers, the device will not output capacitance data.

    If you choose to test this method, I would recommend starting with Table 47 in the FDC2214 datasheet. These recommended register values should get you started with your testing. I would also suggest using an I2C expander, because the FDC2214 only has two possible I2C addresses (so you could not have more than two FDC2214s on the same I2C bus without the I2C expander).

    Regards,
  • 0 in reply to Kristin Jones93
    Prodigy 210 points

    Hi Kristin,

    Thanks for your kind reply. I really appreciate your help! Would it be possible for you to send me the LabView file (appeared in some other threads)? I wonder to know whether I can connect several EVMs via usb directly to a computer and then use LabView to read them. Sorry if the question is very dumb, I am a noob about the electrical stuff.

    Best,

    Hongliang

  • 0 in reply to Hongliang Qian
    TI__Genius 17440 points
    Hi Hongliang,

    You can connect multiple EVMs via USB to a computer and use LabVIEW to read them. Unfortunately we're no longer able to share the internal LabVIEW code, so you would need to write it yourself. I will be out of office this week, so if you have urgent questions please post new threads on the forum. Otherwise, I'd be happy to answer your questions when I get back.

    Regards,
  • 0 in reply to Kristin Jones93
    Prodigy 210 points
    Hi Kristin,
    Thanks for the inputs! Really appreciate your help.
    Best,
    Hongliang