Linux/LDC1612: LDC1612

Dinesh Kumar2

Part Number: LDC1612

Tool/software: Linux

HI,

Based on the application note provided in the LDC1612 Data sheet (8.2.6), we have designed a PCB Coil for sensing the object. But in the manufactured PCB we observe that the track spacing and track width are not uniform. (please refer below image)

Also need your interpretation on the relation between coil's DC resistance and the PCB's critical parameters (say track width & track spacing) and the coil functionality. Because while designing using Webench tool, under the derived parameters list, it shows as the DC resistance of the coil should be of 8.01Ohms (for our requirements).

So please correct me if I am wrong. Shall I measure only the coil's DC resistance in the fabricated PCBs to qualify and use it in the above said application?

over 6 years ago

0 Kristin Jones93 over 6 years ago

TI__Genius 17440 points

Hello,

Can you reattach your image? I'm not able to view it.

We recommend measuring the Rp of the LC tank at its resonant frequency, not the Rs of the coil. This Rp value determines whether the LDC1612 can supply enough current to keep the LC tank oscillating. The minimum Rp value is 1kohm for the LDC1612 (specified in the Electrical Characteristics table in the datasheet).

This application note discusses a few different methods to measure Rp: http://www.ti.com/lit/an/snoa936/snoa936.pdf

We also have the Spiral Inductor Designer in our LDC Tools Excel Calculator, which you can use to estimate the Rp of your coil before fabricating it.

Best Regards,

0 Kristin Jones93 over 6 years ago in reply to Kristin Jones93

TI__Genius 17440 points

Hello,

I haven't heard from you in, so I'm assuming you were able to solve your issue. If this is not the case, please feel free to respond in this thread or post a new question.

Best Regards,

Sensors

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Linux/LDC1612: LDC1612