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How to accurately obtain reference voltage and VCC by STC AD sampling
Use one pin to collect the reference voltage, which is 2.5 volts. If it is 8 bits and the power supply is 5 volts, the value is 128.
If the power supply is 4 volts, the reference voltage is still 2.5 volts, and the resulting value is greater than 128.
According to the difference of the collected values, the current power supply voltage can be calculated, and the collected values can be accurately obtained.
In addition, the reference voltage of stc microcontroller is voltage 0. A few volts lower than the supply voltage.
The computing power of single chip microcomputer is limited, so it is impossible to calculate the power supply voltage first every time, but the power supply can't change quickly, so it is necessary to calculate the benchmark dozens of times every time. Or collect it once every time you turn it on.
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