Research on DP/PA Coupler Based on Specific Agreement Chip

The foreign DP/PA coupler is realized by SIM1 + MCU chip, with a large number of procedures and codes completed by the software, which is very complicated, and technology is confidential. The paper puts forward a design method that we use the smart agreement chip SPC3 and SPC4 as the core to realize the function of the coupler, and use AT89S52 single-chip to control them. These chips are integrated of DP/PA agreement, so it is easier to achieve. And according to this design, we build the hardware, and complete the connection of DP and PA slave respectively in the laboratory. In addition through programming in Keil compiler environment, we accomplish the initialization of SPC3 and SPC4, interrupt handling, as well as DP/PA slave communication test. The experiment shows that the program achieves a satisfactory effect and we try to isolate transmission signal and 3.3V/5V power supply.