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LMP91000 Configuration when Use in Stand Alone Applications

Marie Tupaj
Prodigy 140 points

Other Parts Discussed in Thread: LMP91000, SPUSI2, ADC161S626

Hi,

How does one configure the LMP91000 (for example, the Rload, Transimpedance amplifier, and variable bias) when using in stand alone mode (that is without the LMP91000SDEVAL platform - ie-AD or SPIO-4 boards)

Thanks,

Marie

  • 0
    TI__Genius 16890 points

    Hi Marie,

    All of the configuration variables mentioned can be adjusted by programming the internal registers of the LMP91000.  The registers are programmed using the SPI format.  Pages 13 - 16 of the datasheet gives this information.  The programming can be done by using a stand alone USB to SPI device such at the SPUSI2 board.  The link for this board is:

    http://www.ti.com/tool/spusi2

    The MSP430 can also be used to program the LMP91000.  There is an application note describing how to do this located on the LMP91000 product web page at:

    http://www.ti.com/product/lmp91000

    Mike

  • 0 in reply to Michael Stout
    Prodigy 140 points

    Hi Mike,

    I also purchased the SPIO-4 board and the ADC161S626 board in addition to the LMP91000.  Could a possible solution be to use the LMP91000SDEVAL platform and the driver software to initially program the LMP91000 (i.e., the Rload, Transimpedance amplifier, and variable bias), then take the programmed LMP91000 and use it in standalone mode for my specific application? 

    Please respond,

    Marie

  • 0 in reply to Marie Tupaj
    TI__Genius 16890 points

    Hi Marie,

    Yes, you can plug the SPIO4 board directly into the LMP91000SDEVAL board and use the software to program the part. 

    First set up the board for stand alone use as described in section 2 of the user guide. 

    Power up the board using external supplies.

    Plug the SPIO4 board into the LMP91000SDEVAL board, start the software and program the LMP91000.

    The SPIO4 board can then be removed.

    The memory in the LMP91000 will erase if power is removed so the external supplies need to stay on.

    Mike