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One crazy SAMD21G MCU – I2C/RESET issues (custom PCB design)

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3dgeo:
After connecting VDDANA to 3.3V now instead of no devices I'm getting this:


--- Code: ---Scanning...
I2C device found at address 0x01  !
I2C device found at address 0x02  !
I2C device found at address 0x03  !
I2C device found at address 0x04  !
I2C device found at address 0x05  !
I2C device found at address 0x06  !
I2C device found at address 0x07  !
I2C device found at address 0x08  !
I2C device found at address 0x09  !
I2C device found at address 0x0A  !
I2C device found at address 0x0B  !
I2C device found at address 0x0C  !
I2C device found at address 0x0D  !
I2C device found at address 0x0E  !
I2C device found at address 0x0F  !
I2C device found at address 0x10  !
I2C device found at address 0x11  !
I2C device found at address 0x12  !
I2C device found at address 0x13  !
I2C device found at address 0x14  !
I2C device found at address 0x15  !
I2C device found at address 0x16  !
I2C device found at address 0x17  !
I2C device found at address 0x18  !
I2C device found at address 0x19  !
I2C device found at address 0x1A  !
I2C device found at address 0x1B  !
I2C device found at address 0x1C  !
I2C device found at address 0x1D  !
I2C device found at address 0x1E  !
I2C device found at address 0x1F  !
I2C device found at address 0x20  !
I2C device found at address 0x21  !
I2C device found at address 0x22  !
I2C device found at address 0x23  !
I2C device found at address 0x24  !
I2C device found at address 0x25  !
I2C device found at address 0x26  !
I2C device found at address 0x27  !
I2C device found at address 0x28  !
I2C device found at address 0x29  !
I2C device found at address 0x2A  !
I2C device found at address 0x2B  !
I2C device found at address 0x2C  !
I2C device found at address 0x2D  !
I2C device found at address 0x2E  !
I2C device found at address 0x2F  !
I2C device found at address 0x30  !
I2C device found at address 0x31  !
I2C device found at address 0x32  !
I2C device found at address 0x33  !
I2C device found at address 0x34  !
I2C device found at address 0x35  !
I2C device found at address 0x36  !
I2C device found at address 0x37  !
I2C device found at address 0x38  !
I2C device found at address 0x39  !
I2C device found at address 0x3A  !
I2C device found at address 0x3B  !
I2C device found at address 0x3C  !
I2C device found at address 0x3D  !
I2C device found at address 0x3E  !
I2C device found at address 0x3F  !
I2C device found at address 0x40  !
I2C device found at address 0x41  !
I2C device found at address 0x42  !
I2C device found at address 0x43  !
I2C device found at address 0x44  !
I2C device found at address 0x45  !
I2C device found at address 0x46  !
I2C device found at address 0x47  !
I2C device found at address 0x48  !
I2C device found at address 0x49  !
I2C device found at address 0x4A  !
I2C device found at address 0x4B  !
I2C device found at address 0x4C  !
I2C device found at address 0x4D  !
I2C device found at address 0x4E  !
I2C device found at address 0x4F  !
I2C device found at address 0x50  !
I2C device found at address 0x51  !
I2C device found at address 0x52  !
I2C device found at address 0x53  !
I2C device found at address 0x54  !
I2C device found at address 0x55  !
I2C device found at address 0x56  !
I2C device found at address 0x57  !
I2C device found at address 0x58  !
I2C device found at address 0x59  !
I2C device found at address 0x5A  !
I2C device found at address 0x5B  !
I2C device found at address 0x5C  !
I2C device found at address 0x5D  !
I2C device found at address 0x5E  !
I2C device found at address 0x5F  !
I2C device found at address 0x60  !
I2C device found at address 0x61  !
I2C device found at address 0x62  !
I2C device found at address 0x63  !
I2C device found at address 0x64  !
I2C device found at address 0x65  !
I2C device found at address 0x66  !
I2C device found at address 0x67  !
I2C device found at address 0x68  !
I2C device found at address 0x69  !
I2C device found at address 0x6A  !
I2C device found at address 0x6B  !
I2C device found at address 0x6C  !
I2C device found at address 0x6D  !
I2C device found at address 0x6E  !
I2C device found at address 0x6F  !
I2C device found at address 0x70  !
I2C device found at address 0x71  !
I2C device found at address 0x72  !
I2C device found at address 0x73  !
I2C device found at address 0x74  !
I2C device found at address 0x75  !
I2C device found at address 0x76  !
I2C device found at address 0x77  !
I2C device found at address 0x78  !
I2C device found at address 0x79  !
I2C device found at address 0x7A  !
I2C device found at address 0x7B  !
I2C device found at address 0x7C  !
I2C device found at address 0x7D  !
I2C device found at address 0x7E  !
done

--- End code ---


Troll board... :-DD

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