The Use of MCS-51 Parallel Port to Simulate Digital Potentiometer
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Jinlan Zhang, Mei Lin, Zeli Zhang
Digital potentiometer is another form of DAC circuit, which has been widely applied in the measurement and control(MAC). But, the commonly used of digital potentiometer resistance value is limited to 10kΩ, 50kΩ, 100kΩ, 200kΩ, and its change of resistance is linear. This is often not suitable for the needs of the measurement and control. And digital potentiometer chip is imported products, not easily to buy and it is with higher cost. 51 MCU is cheap to buy, there is not pull-up resistors in its P0 port, and by connecting power resistor can simulate simple digital potentiometer. If other parallel port is used, cooperate with analog switch CC4066 can simulate digital potentiometer, and the resistance can choose according to the need.
DCP, Power Resistance, 51 MCU, P0 Port