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LDC1101: Temperature characteristics

user804961
Prodigy 60 points
Part Number: LDC1101
Other Parts Discussed in Thread: LDC1612

I am using LDC1101, please tell me how to improve the temperature characteristics.

The power supply has good temperature characteristics.

Capacitors with the best temperature characteristics are used.

If I change from 0 ° C to 60 ° C, the data will change greatly.

What are the most effective countermeasures?

  • 0
    TI__Mastermind 23810 points

    Can you tell me more about your application?

    The best way to compensate for temperature changes is to use a reference sensor. The LDC1101 only has one channel, so you would need to switch to the LDC1612. 

  • 0
    Prodigy 60 points
    It is for measuring the distance, but there is only room for the size of the nail, so there is no room for a sensor for reference.
    差出人: Clancy Soehren <bounce-1839293@mail.e2e.ti.com>
    送信日時: 2020年1月31日 8:13
    宛先: mmwave_sensors_forum@mail.e2e.ti.com <mmwave_sensors_forum@mail.e2e.ti.com>
    件名: Sensors forum: LDC1101: Temperature characteristics
     

     

    A Message from the TI E2E™ support forums
    Texas Instruments

     

    Clancy Soehren replied to LDC1101: Temperature characteristics.

    Can you tell me more about your application?

    The best way to compensate for temperature changes is to use a reference sensor. The LDC1101 only has one channel, so you would need to switch to the LDC1612. 

     
     

    You received this notification because you subscribed to the forum.  To unsubscribe from only this thread, go here.

    Flag this post as spam/abuse.

    refid:16043670-bae7-4f24-b3d3-c26e34c2ca6e
  • 0 in reply to user804961
    TI__Mastermind 23810 points

    At what distance are you trying to detect the nail?

    Make sure that your reference clock is also stable across temperature. Any drift there will translate to drift in your output codes.

    If you cannot use a reference sensor, then the only other option is to make your signal larger so that temperature changes have less of an impact. To do that, you either need to increase the size of your sensor coil or reduce the distance between coil and target.

    If your mechanical constraints are so limited that you cannot do any of the above suggestions, then you may need to find a different technology for your application.

  • 0
    Prodigy 60 points
    This means that the space for storing the board and coil is about the size of a nail.
    The detection object is iron, and the distance is 3mm or less.
    The fluctuation of the reference clock is about 0.2% at the maximum, but the obtained data fluctuates much more. Resolution is less than 0.1 micron, but can vary by 100 microns.

    差出人: Clancy Soehren <bounce-1839293@mail.e2e.ti.com>
    送信日時: 2020年2月1日 1:48
    宛先: mmwave_sensors_forum@mail.e2e.ti.com <mmwave_sensors_forum@mail.e2e.ti.com>
    件名: Sensors forum: LDC1101: Temperature characteristics
     

     

    A Message from the TI E2E™ support forums
    Texas Instruments

     

    Clancy Soehren replied to LDC1101: Temperature characteristics.

    At what distance are you trying to detect the nail?

    Make sure that your reference clock is also stable across temperature. Any drift there will translate to drift in your output codes.

    If you cannot use a reference sensor, then the only other option is to make your signal larger so that temperature changes have less of an impact. To do that, you either need to increase the size of your sensor coil or reduce the distance between coil and target.

    If your mechanical constraints are so limited that you cannot do any of the above suggestions, then you may need to find a different technology for your application.

     
     

    You received this notification because you subscribed to the forum.  To unsubscribe from only this thread, go here.

    Flag this post as spam/abuse.

    refid:f71fcd3c-4d31-4f78-842e-df478166f4b5
  • 0 in reply to user804961
    TI__Mastermind 23810 points

    Are you using the maximum RCOUNT setting? This setting determines how long each measurement is sampled for and can have a large impact on the noise floor of the device.

    If you are already using the highest RCOUNT, a C0G external capacitor, and a stable external clock, then there is not much else that can be done besides finding room for a reference sensor.