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Original question:

LDC1101EVM: LDC1101 register configuration

LDC1101EVM: Inductance value reading issue

Manish_Thakur
Genius 5085 points
Part Number: LDC1101EVM

Hi Experts,

I'm using LDC1101EVM for detecting metal thickness. Basically I'm reading the strength of the inductive response to do so. So, I have two seperate metal peices made of Aluminium. When I place one metal in front of the sensor it shows some values as it depends on how far I place, similiar thing I'm doing with second metal peice. But, when I'm combining the two metal peices as one it shows the same value as like single layer metal peice. I'm reading the inductance count. How is this possible? I have configured following registers:

1) RP_SET as 0x36

2) TC1 as 0xDE

3) TC2 as FE

4) DIG_CONFIG as 0xEF

5) START_CONFIG as 0x00

Can you say why I'm getting same value in both the cases (in single layer and as well as in double layer) ? I shall be grateful for that.

EDIT 1 : Does the inductance value will change according to temperature??

  • 0
    Genius 5085 points

    Part Number: LDC1101EVM

    Hi Experts,

    I was testing LDC1101EVM board for measing metal thickness, so I was reading the strength of the inductive response. Basically I have two metals when I place single metal seperately and when I place second metal seperately values are different. But when I'm combining both the metals and reading its value values are likely to same as a single metal value. I have used the following registers to configure that

    1)

  • 0
    TI__Mastermind 21020 points

    Manish,

    The induced eddy currents in the target are primarily surface currents which are constrained to the first 2-3 skin depths.  At your operating frequency this should be less than 100 um in aluminum.  

    For more information on target design, please refer to the document below

    http://www.ti.com/lit/an/snoa957a/snoa957a.pdf?&ts=1590158158375

    Thanks,

    Scott