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LDC1101: What should the data be?

joe polley
Prodigy 20 points
Part Number: LDC1101

Hello all I im working with the ldc1101evm board and my own board with the ldc1101 chip. as of now they have basically the same layout, but the ldc1101evm gives a constant value of about 47k counts with a std dev. of about 100 counts. while my board is giving an odd out put from about 1000 numbers i will attach what im getting below. i am wondering what should be the output of the ldc1101 chip? does the ldc1101evm gui average measurements and that is what outputted?

Thank you for your help.

  • 0
    TI__Mastermind 39320 points

    Hello Joe,

    No, the GUI does not do any averaging.  This is the raw data output.  

    A couple of things to check.

    Is your coil design also the same as the EVM?  If not, you could try connecting your coil to the EVM to see if the issue follows the coil.

    Another thing to check are your register settings.  You could compare the EVM register configuration to your board and make changes where needed.

  • 0
    Prodigy 20 points

    Hello Eddie i am currently using our custom coil on both boards, and getting these results. and i have matched the registers from the evm to my own board, and i still get the same results. the process im doing on my board is reading the status register and waiting to see when the bit that signifies that there is new data i then read the data.

  • 0 in reply to joe polley
    TI__Mastermind 39320 points

    Thanks Joe.  On your board, do you have any other components which could be contributing to the noise?  Radios, switching regulators, motors for example.

    Would you also share your schematic and layout?

  • 0 in reply to Eddie LaCost
    Prodigy 20 points

    There is a buck on the board that is stepping down 24v to 5v, but I only see about 10-15mv of noise from it. and I don't mind sharing the files for the schematic and layout, but I would prefer to not do it publicly. is there anyway i can send them to you personally?

  • 0 in reply to joe polley
    TI__Mastermind 39320 points

    No problem.  I will send you a "friend request" where you can send it privately.