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Output of ADC port when no input is supplied.

Remony
Expert 1560 points

Hi,

I have some questions.

I use MSP-EXP430G2 LaunchPad.

I programed example msp430g2x33_adc10_14.c.

And I measured A0 port. Level is about 1.8V. (I guess this level is VCC/2. VCC is 3.6V)

I don't connect any circuit. A0 input is opened.

why does A0 port  output?

 A0 channel input of my customized board  has 0V or 1.2V range.

I want to decide High or Low using ADC. But when input is 0V, ADC reads 1.8V.

1.8V is made by ADC ouput.

I don't understand why this happen.

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