Shield is taking signal

LaKa_4300241 · ‎Nov 27, 2019

Hi

I am using a sensor PCB with two loops, outer loop is GND and inner loop is sensing loop. The shield is hatched at the back of PCB so that it should not sense.

I am using kit CY8CKIT-145-40XX

pin 4.0 is connected to shield in PCB

pin 1.4 is connected to sensor in PCB

pin GND is connected to GND in PCB.

I want the PCB that shield should not take signal. I am sure that wires are not touching PCB.

Pictures are attached in the mail for better understanding. The picture that i have uploaded have only one loop on PCB but i am using PCB with two loops.

BragadeeshV · ‎Dec 20, 2019

Hi LaKa_4300241,

The time taken by a capacitor to completely charge is 5 RC, where RC is the time constant.

For your reference: https://www.electronics-tutorials.ws/rc/rc_1.html

Now taking into account both charging and discharging cycle, we arrive at 2 * 5RC = 10 RC. We need to choose Fsw such that it is able to charge and discharge the capacitor completely.

It looks like you have used a pin that is connected to some other component in the kit. Please refer to the kit schematic and make sure that your shield pin is not connected to any other component (pullups for example).

Regards,

Bragadeesh

Regards,
Bragadeesh

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Shield is taking signal

Shield is taking signal

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