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LDC1614: Noise Concern

Dajon McGill
Expert 4730 points
Part Number: LDC1614
Other Parts Discussed in Thread: TIDA-01102

Hello Team,

I am working with a customer to quickly bring up a touch keypad. They are thinking about implementing the LDC sensor from our TIDA-01102, but are concerned that the 125kHz and 13.56MHz signals from their system may generate false touches. They are not wanting to do a lot of programming and only have a BLE chip on their design.

Can you comment on how/if our system will be safe from these events?

Best,
Dajon McGill

  • 0
    TI__Genius 17690 points

    Hello Dajon, 

    There are a couple things the customer can do to reduce the impact of noise on the LDC. For starters, I recommend reading the EMI Considerations for Inductive Sensing app note as it has guidelines for implementing an EMI filter for the sensor. Additionally, if those are the only two frequencies of concern for the customer, you can make sure the coil design stays away from these two values. You can either adjust the coil layout or the capacitor to accomplish this. 

    Hope this helps,