Digital bus isolation communication circuit
A technology of isolating communication and digital bus, applied in the direction of logic circuit coupling device, logic circuit connection/interface layout, etc., can solve problems such as circuit application limitations, and achieve simple results
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[0012] In order to make the present invention more comprehensible, preferred embodiments are described in detail below with accompanying drawings.
[0013] as figure 2 The single-wire data bus input / output circuit shown is taken as an example, and a digital bus isolation communication circuit provided by the present invention is further described.
[0014] Such as figure 2 The single-wire data bus input / output circuit shown is mainly composed of optocoupler devices U 1 , U 2 , open-drain output comparator U 3A , U 3B , resistor R 1 ~R 6 , constant voltage source V CC , V DD composition. The difference between an open-drain output comparator and a general comparator is that the high-level voltage value output by the comparator is determined by an external circuit, which has nothing to do with the comparator's own operating voltage. Optocoupler U 1 and open-drain output comparator U 3A Composition of digital signal output circuit; optocoupler U 2 and open-drain ou...
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