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FDC1004: Demultiplexing signals from multiple sensors to FDC1004 channels

Avinash Hasirumane1
Prodigy 10 points
Part Number: FDC1004
Other Parts Discussed in Thread: LDC1614, FDC2214

There is a need for multiple sensors around 50 in one of the application that we are working on and the question is,

1. Can we use a demux chip to de-multiplex the signals from various sensors into FDC1004 channels? If so, what is the best ti DEMUX IC we can use in the range of 3.3 to 5V rating?

2. We were exploring FDC 2214 and found that it could not be hot swapped. Our understanding is, we cannot use demux. Is that right?

3. How better MSP430 CapTIvate is compared to FDC1004 for a sensor size around a 10mmX10mm size?

Thank you in advance.

  • 0
    TI__Mastermind 23810 points

    Avinash,

    Thank you for your questions. We will get back to you by the end of the week.

    For question number 3, we don't have any direct comparisons between FDC1004 and MSP430's CapTIvate. If using captivate makes sense in your system (i.e. you have use for the MCU), then I recommend going with captivate. They also have a better design infrastructure when compared to the FDC1004.

  • 0
    TI__Mastermind 23810 points

    1. You should be able to mux the FDC1004 as long as you aren't using the repeat mode of operation. You will need to manually trigger each measurement. We haven't evaluated this option, so I do not have a specific mux to recommend.

    2. The FDC2214 can also be used with a mux. Just make sure that you are not hot-swapping sensors. The LDC1614 uses a similar architecture and uses muxes in this TI design. Similar principles can be used for the FDC2214.

    http://www.ti.com/tool/TIDA-01102