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Hot!Reading Analog Value

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NKurzman
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Re: Reading Analog Value 2019/05/01 22:48:50 (permalink)
+1 (1)
You can measure higher than the reference if a resistor divider is added.
If you are using a Precision reference. Then it’s typically must be lower than Vcc. The details are in the data sheet
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john_ive
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Re: Reading Analog Value 2019/05/02 05:09:42 (permalink)
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qhb
What is the maximum PEAK voltage you need to measure?
You cannot measure higher than your reference voltage, so if Vref=3.3V, you cannot measure more than 3.3V.


Measuring voltage will be 0VDC to +3VDC only
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1and0
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Re: Reading Analog Value 2019/05/02 05:36:35 (permalink)
+1 (1)
john_ive
Measuring voltage will be 0VDC to +3VDC only

Then use Vss for Vref- and +3V or +3.3V for Vref+ for better resolution.
 
FYI: The resolution for a 10-bit ADC is    (Vref+ - Vref-) / 1024
post edited by 1and0 - 2019/05/02 05:39:22
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