The system is equipped with a D/A conversion interface and adopts a 10-bit analog-to-digital converter TLC5615. The circuit is shown in Figure 3-4. The output voltage of the D/A conversion part is used as the reference voltage of the regulated output circuit. The output of the regulated output circuit is proportional to the reference voltage. The chip selection signal, serial data, and clock of the TLC5615 are controlled by the P11, P13 and P12 pins of the microcontroller. The timing diagram is shown in Figure 3-5.
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