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  • TI Thinks Resolved

LMP91000: Dual Gas Sensor (ex. CO+H2S)

Part Number: LMP91000

Hi Tiers.

My customer considering LMP91000 using Dual Gas Sensor.

Dual Gas Sensor has 4 leads (common RE,CE, two WEs)

Can I designed using two LMP91000s like below block?

  • Hi SS,
    In theory your suggestions it sounds reasonable. However i will like to understand better your sensor. If there is no need to bias two conditions at the same time (majority of cases on sensors for dual gases) you could switch WE signal with a mux scheme.

    This is not a very common case.

    Regards,
    Jose
  • In reply to Jose Arteaga4:

    Thank you Jose.

    I attached gas sensor data.

    Please check and let me now how to design using 2x LMP91000.

    If I need to use mux, do you have some block? and recommend TI Mux Part.

    (AlphaSense)_AAN 112-02 POTENTIOSTAT CIRCUIT FOR D2 COMBINED CO AND H2S SENSOR.pdf(AlphaSense)_CO+H2S_Dual-Toxic-Sensor__COH-A2.pdf

  • In reply to SS Jung:

    You design with 2 LMP91000 (based on the schematics) seems to be ok, however TI can not guarantee the functionality or even provide guidelines since this is a very exotic use case we didnt't verify. The ones that we can recommend can be found Webench Designer tool, but your sensor is not there. My suggestions to you is to create the prototype and check with two LMP91000 as shown in your design and test if it works.

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