Design of Crosstalk Prevention Communication for Multiple Pieces of ADS7863 and DSP28335

This paper designs the hardware interface and software interface between a McBSP(multi-channel buffered serial port) of DSP28335 and two pieces of ADS7863, for the realization of multi-signal crosstalk prevention serial communication between DSP and serial A/D converter. In this interface design, data output pins of two pieces of ADS7863 are multiplexed with the same McBSP pins for data output. In order to prevent crosstalk between output data, it needs to control the chip selection signals of two pieces of ADS7863 to stagger a dead time. In addition, in this design, the serial A/D converter is directly connected to the McBSP pins, not occupying DSP's parallel data bus and will avoid from bus interference. By CCS environment programming and debugnation, satisfied experimental result is achieved, and the correctness of the interface design is verified.