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LMP91200 configure as pH measumement

Mauricio Perez
Prodigy 10 points
Other Parts Discussed in Thread: LMP91200

Hi, I´m interest for use the CI LMP91200 for measurement of pH and temperature. But i have a problem in the connection for SPI with launchpad stellaris.

How configure the adress direction to file main?, I can use with Stellaris Launchpad. This Integer is very good for my application and is for degree project (I´m Chemistry Student)

Greetings and I´m attentive any comment.

  • 0
    TI__Intellectual 1915 points

    Hi Mauricio,

    The LMP91200 contains only one 16 bits register, it's a configuration register and doesn't contain the value of the ph or temperature, please check page 19 of the datasheet for more details about this register. Be careful while setting up the clock phase and chip select ( low when active high when inactive) . 

    The LMP91200 is a front end that gives you a differential output voltage that you can measure using an ADC. I suggest you to start with dedicated evaluation module and its schematic to understand more in details the functionality of the chip.

    Amjad