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LDC1612: Temperature behaviour

Jose
Prodigy 20 points
Part Number: LDC1612

Hello

We are working with this sensor with very good results at ambient temperature but not so good when we perform tests from 5ºC to 50ºC.

In the datasheet paragraph 8.2, a typical Application is detailed and it seems that second channel is used for temperature compensation. Could anyone explain how such compensantion is done?. I can see how the register values are calculated for emvironment conditions, but I don't know how the second channel is used to mitigate temperature effect on measurement.

Thank you

  • 0
    TI__Intellectual 2725 points
    Hi user1501721,

    Are you testing the device on our EVM? What is the tempco of the sensor capacitor?

    If the second coil is placed such that the it does not see the target (conductive object), you can use the data from the second channel as a baseline and measure the delta between the two readings. Since the second channel will never be exposed to the conductive stimuli any changes observed in the sensor readings can be attributed to environmental changes and neglected.

    You will need to make sure the sensor coil and cap are matched/similar between channel 1 and channel 2.

    Regards,

    Varn
  • 0 in reply to Varn Khanna
    Prodigy 20 points

    Hi Varn

    Thak you for your answer.

    We are doing exactly that. The capacitors we are using are C0G as explained in SNAA212.

    We still are experiencing some problems with measurement. Today we are going to perform more test with different mechanical architecture and trying to fully isolate the coils from the rest of the electronics. Maybe this is the resason of all our problems.

    Regards