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LDC0851EVM: What can we pay attention to test EVM?

Part Number: LDC0851EVM
Other Parts Discussed in Thread: LDC0851


We are testing the EVM, and the coil's picture as below.

The diameter is 8mm, and the coil's up and down have 20 circles.

From the test result we can see the distance is less 2mm, and the return difference is more than 50%.

Pls. help to give some advice, many thanks!

Best regards

Luck WU

  • Hello,
    With the LDC0851, to get the longest sensing range you need to ensure that both inductors are well matched. With wire-wound inductors it is quite easy to have mismatch which will eat into your sensing range, which is why we primarily recommend PCB-based inductors. If you want to do a wire-wound solution then we would recommend to measure both inductors and tune them until they are matched.