MCU;  Timing/counter;  A/D conversion;  Double Credit

Through the analysis of the double integral A/D conversion process and its principle, combined with the characteristics of the 8031 single-chip microcomputer timing counter, a new A/D conversion circuit is designed. The hardware principle and working process of this conversion circuit are introduced in detail, and a practical hardware circuit and software design block diagram is given. Through comparative analysis, it can be seen that the performance price of this A/D conversion circuit is relatively high, the software programming is simple, and the conversion speed and accuracy are better than the general A/D conversion circuit. This design idea points out a clear direction for the upgrade of digital-to-analog converters (A/D).