The digital potentiometer is mainly used to establish the voltage to voltage ratio circuit, which is not suitable for series connection of pure variable resistor and external resistor
1. It can carry small current, generally in 1mA ~ 3mA
3. The resistance is made on silicon wafer, and the temperature coefficient is obviously larger than that of metal film or carbon film, but the relative temperature coefficient between them is not very different
Here, the VCC range of power supply is 0 ~ 7V, and the 3.3V power supply for personal test.
Finally, pay attention to the timing. If you only adjust the resistance value, pay attention to the maintenance time of Inc # high and low level.