Til117 pin diagram
Til117 application circuit
In the application system, the baud rate of the communication data tends to be higher (usually above 4800 baud) due to real-time monitoring and response to the field conditions. The "bottleneck" that limits the increase in communication baud rate is not the wire on site (5 types of unshielded twisted pair are used in the field construction), but on the optocoupler circuit that isolates the signal from the microcontroller system. TIL117 is used here. In the circuit design, high-speed optocouplers, such as 6N137, 6N136, etc., can be considered, and the design of common optocoupler circuit parameters can be optimized to make it work in an optimal state. For example, if the resistors R2 and R3 are selected to be larger, the photocoupler's LED will become slower from the cut-off saturation. If the selection is too small, the saturation will be slow, so the values ​​of the two resistors must be Carefully selected, different types of optocouplers and drive circuits make the values ​​of these two resistors slightly different, which is particularly cautious in the circuit design, can not be arbitrary, usually can be determined by experiments.
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