Design of Serial/Parallel Communication Interface of Digital Potentiometer with PC

摘要

RS-232 serial port of the PC and I 2 C bus digital potentiometer serial communication can be realized by single-chip micro-computer, PIC16F62 made by Microchip Company and RS-232 voltage converter as the hardware circuitry, its excellence. High run speed, high transmission speed (120kbps), low power, small bulk, low work voltage, high drive ability etc. Introduced hardware verifies and debugs method. There are two parts of program flow of the software design: one is the communication of PC and PIC16F628, and the other is the communication of PIC16F628 and I 2 C bus digital potentiometer. Given the example of the communication timing of single-chip micro-computer with I 2 C bus, and the method of serial communication by the DS2W soft tool between dialog box of the Window and I 2 C bus digital potentiometer. To realize the communication of PC parallel with I 2 C bus digital potentiometer, designed one type interface circuitry based on high speed CMOS inverter and Parallel Port soft tool, and insulated the PC parallel circuitry, and turn the TTL level of the parallel to Open-Drain level for the I 2 C interface, which can take place emulator or evaluate demo board to debug the digital potentiomenter. The designing software should insure to determinant the address of the slave digital potentiomenter. At last given the program and explain of verify and debug the digital potentiomenter by Debug using a typical parallel address. The given design has already validated, and has practical value.