Touch Hang in Microchip SAMD series

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Dear all,

 

We are developing a touch panel using a microchip SAMD20 series touch MCU.
We are using MPLAB X IDE for development.
We have done tuning for touch using a data visualizer.

 

When giving power supply from isolated power supply our touch panel is working fine.
But when we use 7805 or non-isolated DC supply our touch is working very slow & hanging some time.

Can you help us to provide support for same to resolve issue ?

Thank You

dharmendra