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Original question:

LMP91000EVM: sensor interfacing

LMP91000: Sensor thais can be used for?

Dharmesh Joshi
Expert 1895 points
Part Number: LMP91000

Hi

I am interested in using the LMP91000. We have our existing design, but we would prefer to send it via a secure link or email, so it's not available in the public domain.

We intend to use this for NO2,NO and OX sensors. Before I get into technical questions, I would like to know the following.

Please find attached the following:

 

  1. Our Existing design(to be sent via email if possilbe) uses the NO2 and OX Sensor.

        2.  We are using the ISB board from the NO sensor manufacturer.  This PCB is similar to our custom board but is configured slightly differently to bias polarity. 

         3. Data Sheets For N02, No, and OX Sensors

  

These Sensors output a WE and Aux Voltage output. When used with LMP91000 I guess we can simply monitor WE signal only and ignore the Aux.

If I have understood the datasheet correctly, LMP91000 only output an Analogue signal?

Would this LMP91000 be adequate for these sensor types?

  • 0
    TI__Genius 9380 points

    Dharmesh,

      The LMP91000 is a transimpedance amplifier that will convert the current in the sensor to a voltage then output the analog voltage to an external ADC. It is programable, so the bias and the zero can be adjusted as needed. The LMP91000 will work for all of your sensors, but you will need to determine if they are 2 pin, 3 pin or 4 pin sensors. Each will operate a little different and your circuit will have to be designed accordingly. 

    The data sheets for the sensors will have to come from the manufacture of the sensor. TI does not make the sensors. There are several application notes on TI's website for this part that will help you with the circuit design. 

    Even though the LMP91000 will be providing you with an analog voltage, you will have to calculate the sensor values for each sensor. 

    Search E2E for this part number, I have written allot about how to use this part with different sensors and even information about calibrating and calculating. It will be worth your time to read these posts.

    If you have questions about sensors I will need part numbers for the sensors you have selected.   

    You should be able to send me the schematics and specific questions directly from this E2E post.