Psoc 4 ADC Sine Wave

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I want to put a sine wave in a psoc pin input, then send the result to the pc. But i can only recieve the positive values. I already have the adc configure to signed values, is there any more configuration i should change?

Thank You

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Level 10
Level 10
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You will have to level-shift the sine input using a resistor ladder so that the voltage is between GND <= sin <= VDDA

No GPIO may be driven below GND, could damage the chip.