Capacitive touch sensor

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GaKo_4394681
Level 1
Level 1

I am designing a Capacitive touch sensor using Cypress CY8CMBR3102 IC. Circuit diagram is attached. The IC works properly. when any finger is touched to the pad, the LED glows and as soon as the finger is removed the LED goes off, That's perfect. But when the system is OFF and i keep the finger on the Touch Pad and then i switch ON the system, it does not detects the finger on startup, so i have to remove the finger and place it again, can anybody please let me know what changes have to be made in the circuit for the IC to detect the finger on Startup.

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LinglingG_46
Moderator
Moderator
Moderator
500 solutions authored 1000 replies posted 10 questions asked

If you keep the finger on the Touch Pad and then switch on the system, it will not detect the finger.  The result is normal.

Because the system is powered on by default without key triggering. More about the theory, you can refer to the MBR3 capsense design guide:https://www.cypress.com/file/46366/download

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