Microcomputer interface circuit optical isolation

A plurality of input ports microcomputer, receives transmitted from a remote field device status signals, the computer processing of these signals, outputs various control signals to perform the corresponding operation. In the field environment more hostile when there is a big noise, if these disturbances along with the input signal into the computer system, will control the accuracy of the reduced, resulting in malfunction. Thus,lcd graphic display  in the input and output of the microcomputer, as the interface with the coupler, the signal and noise isolation. The circuit is mainly used in the "A / D Converter" The digital signal output, and by the CPU of the forward channel control signal and the analog interface circuit, and thus to achieve different systems associated signal path between the same time, electrically isolated from each other on the path, and on this basis to achieve the analog circuits and digital circuits isolated from each other,OLED Module  play a role in suppressing crosstalk.

For linear analog circuit path, requiring optocouplers must be able to carry out a linear transformation and transmission characteristics, or select on the tube, using complementary circuits to improve the linearity, or V / F conversion and then with digital optocoupler isolation.