Regarding cross points of capsensor trace.

[YuMa_1534086]

Q1)

When using Guard Sensor, cross points of Guard Sensor and Button Sensor will always be occurred like red circle of below figure.

Could you please let us know conditions, recommended range, limitations etc of these cross points?

(recommended length, width, number, area, etc)

Q2)

When using CSX, cross points of TX and RX will always be occurred like orange circle of below figure.

Below figure is layout of CY8CKIT-145-40XX.

Could you please let us know conditions, recommended range, limitations etc of these cross points?

(recommended length, width, number, area, etc)

Best Regards.

Yutaka Matsubara

[Hari · Accepted solution]

Hi

Since the CapSense traces are routed on the layer opposite to that of the sensor, it will not cause any crosstalk with other traces running orthogonal.

Even in case of CSX, the Tx and Rx traces are orthogonal and will not cause any crosstalk. The general layout guidelines can be followed as given in CapSense Design Guide, page 115. Link: https://www.cypress.com/file/46081/download

If two traces are running parallel, it is recommended to separate them with a ground trace.

Thanks and regards

Harigovind

[YuMa_1534086]

Harigovind-san.

Thank you for your support.

I understand it.

Best Regards.

Yutaka Matsubara