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5 - Peripherals
Let us now add to that voltage V0, a small voltage, that is equal to half the smallest step, that
is,
If the voltage V0 is included within
the converter will convert it as Adc0.
If the voltage V0 is included within
the converter will convert it as Adc0 + 1.
We can now distinguish more finely between two values of the input voltage, as soon as they
differ by more than
Let us exploit this by doing two successive conversions of the voltage V: the first time with V0
alone, the next time with
Vdda
255 2×
------------------
Vdda Adc0×
255
--------------------------------- V0
Vdda Adc0
1
2
---+
×
255
------------------------------------------------≤≤
Vdda Adc0
1
2
---+
×
255
------------------------------------------------ V0
Vdda Adc01+()×
255
-----------------------------------------------≤≤
Vdda
255 2×
------------------
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