Hang-up and handle connection detection circuit

Abstract

The invention discloses a hang-up and handle connection detection circuit, which comprises a DC power supply, a hang-up detection circuit, a connection detection circuit and a state detection circuit,wherein the hang-up detection circuit comprises a hang-up switch and a hang-up triode with the base connected with the hang-up switch, the hang-up triode is serially connected with the DC power supply and the state detection circuit, and when the hang-up switch is closed, conduction with the state detection circuit is carried out through the hang-up triode; the connection detection circuit comprises an impedance horn and a connection triode with the base connected with the impedance horn, the connection triode is serially connected with the DC power supply and the state detection circuit, andwhen the impedance horn is closed, conduction with the state detection circuit is carried out through the connection triode; and the state detection circuit is serially connected with the DC power supply, the hang-up triode and the connection triode through single lines for outputting high level signals when the hang-up detection circuit is conducted and the connection detection circuit is closedfor being detected by a processor. Hardware resources of the processor can be saved, mutual interference is reduced, and the production troubles are reduced.

Description

technical field [0001] The invention relates to the technical field of circuits, in particular to a circuit for single-line detection of telephone on-hook and handle insertion. Background technique [0002] In the application of a landline phone, it is necessary to detect whether the on-hook button (insert switch) is in place, and whether the line of the phone handle is connected. The general method is to use an IO port to detect whether the on-hook button is pressed to determine whether the user is There is a need to make a phone call, but generally there is no detection of whether the connection line between the handle and the base phone is connected. If you want to detect whether the connection line between the handle and the base phone is connected, the usual method is to add an IO port to detect The connectivity of this line, in this way, this application requires two IO ports to detect the state of the on-hook button and the state of the connection line between the han...

AI Technical Summary

Problems solved by technology

[0004] The invention provides an on-hook and handle connection detection circuit, which is used to overcome the defects in the prior art, such as waste of processor IO resources, more physical connections that easily cause greater interference, and production troubles, and realize single-line detection of telephone on-hook and handle insertion situation, reduce the waste of processor IO resources, reduce interference, and reduce production troubles

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