CN-224217099-U - Communication circuit

Abstract

The application relates to the technical field of communication, and particularly provides a communication circuit. The communication circuit comprises a connector, a signal transmitting end, a signal receiving and transmitting circuit and a switching circuit, wherein the connector comprises a grounding terminal pin, a power terminal pin and a signal terminal pin, the signal receiving and transmitting circuit comprises a signal transmitting circuit and a signal receiving circuit, the signal transmitting circuit is connected with the signal transmitting end, the signal receiving circuit is connected with the signal receiving end, the switching circuit is connected between the signal receiving and transmitting circuit and the signal terminal pin, the switching circuit has a first state and a second state, when the switching circuit is in the first state, the signal transmitting circuit is communicated with the first signal terminal pin and disconnected with the second signal terminal pin, when the switching circuit is in the second state, the signal receiving circuit and the signal transmitting circuit are both communicated with the same one or two of the first signal terminal pin and the second signal terminal pin.

Inventors

• LIU JIAN

Assignees

• 小米科技(武汉)有限公司
• 小米智能家电(武汉)有限公司
• 北京小米移动软件有限公司

Dates

Publication Date

20260508

Application Date

20250430

Claims (10)

1. 1. A communication circuit, comprising: The connector comprises a grounding terminal pin, a power terminal pin and a signal terminal pin, wherein the signal terminal pin comprises a first signal terminal pin and a second signal terminal pin; The signal transmitting end is used for transmitting signals; a signal receiving end for receiving signals; The signal receiving and transmitting circuit comprises a signal transmitting circuit and a signal receiving circuit, and the signal transmitting circuit is connected with the signal transmitting end; the signal receiving circuit is connected with the signal receiving end; The switching circuit is connected between the signal receiving and transmitting circuit and the signal terminal pin, and is provided with a first state and a second state, when the switching circuit is in the first state, the signal transmitting circuit is communicated with the first signal terminal pin and disconnected with the second signal terminal pin, the signal receiving circuit is communicated with the second signal terminal pin and disconnected with the first signal terminal pin, and when the switching circuit is in the second state, the signal receiving circuit and the signal transmitting circuit are communicated with the same one or two of the first signal terminal pin and the second signal terminal pin.
2. 2. The communication circuit according to claim 1, wherein the signal transmitting circuit is connected to the first signal terminal pin, the signal receiving circuit is connected to the second signal terminal pin, the switching circuit includes a first switching circuit and a second switching circuit, the first switching circuit is connected between the first signal terminal pin and the signal transmitting circuit, one end of the second switching circuit is connected between the first switching circuit and the signal transmitting circuit, and the other end of the second switching circuit is connected between the second signal terminal pin and the signal receiving circuit; The first switching circuit is conducted when the switching circuit is in the first state, the second switching circuit is disconnected, and the first switching circuit is conducted or disconnected and the second switching circuit is conducted when the switching circuit is in the second state.
3. 3. The communication circuit of claim 2, wherein the first switching circuit comprises a first switching resistor and the second switching circuit comprises a second switching resistor, wherein the first switching resistor is on and the second switching resistor is off when the switching circuit is in the first state, and wherein the first switching resistor is on and the second switching resistor is off and the switching circuit is on and the second switching resistor is on when the switching circuit is in the second state.
4. 4. A communication circuit according to claim 3, wherein the first switching resistor and/or the second switching resistor comprises a jumper resistor.
5. 5. The communication circuit according to claim 1, wherein the signal transmitting circuit is connected to the first signal terminal pin, the signal receiving circuit is connected to the second signal terminal pin, one end of the switching circuit is connected between the first signal terminal pin and the signal transmitting circuit, and the other end of the switching circuit is connected between the second signal terminal pin and the signal receiving circuit; The switching circuit is disconnected when the switching circuit is in the first state, and the switching circuit is conducted when the switching circuit is in the second state.
6. 6. The communication circuit of claim 1, further comprising a power supply terminal and a ground terminal, wherein the signal transmission circuit comprises a first switching tube, wherein the first switching tube comprises a first terminal, a second terminal, and a first control terminal, wherein the first terminal of the first switching tube is connected to the power supply terminal, wherein the second terminal of the first switching tube is connected to the ground terminal, and wherein the first control terminal is connected to the signal transmission terminal.
7. 7. The communication circuit of claim 1, further comprising a power supply terminal and a ground terminal, wherein the signal receiving circuit comprises a second switching tube, wherein the second switching tube comprises a first terminal, a second terminal, and a second control terminal, wherein the first terminal of the second switching tube is connected to the power supply terminal and the signal receiving terminal, wherein the second terminal of the second switching tube is connected to the ground terminal, and wherein the second control terminal is connected to the switching circuit.
8. 8. The communication circuit of claim 7, wherein the signal transceiving circuit further comprises a filter circuit coupled between the second control terminal and the ground terminal.
9. 9. The communication circuit of claim 1, further comprising a power supply terminal, a ground terminal, and a protection circuit coupled between the power supply terminal and the ground terminal, the protection circuit comprising a first diode and a second diode coupled in series, a midpoint of the first diode and the second diode coupled to the switching circuit.
10. 10. The communication circuit of claim 1, further comprising a bi-directional transient voltage suppression diode connected between the ground terminal pin and the power terminal pin, and/or, The communication circuit further includes a capacitor connected between the ground terminal pin and the power terminal pin.

Description

Communication circuit Technical Field The application relates to the technical field of communication, and particularly provides a communication circuit. Background In the prior art, when the main board is connected with the display board, only a single mode of three-wire communication is adopted for the main board and the display board or a single mode of four-wire communication is adopted for the main board and the display board. When the main board is a three-wire communication circuit and the display board is a four-wire communication circuit, or the main board is a four-wire communication circuit and the display board is a three-wire communication circuit, the main board and the display board cannot be matched, and at the moment, the main board and the display board cannot be in communication connection. Disclosure of Invention The application aims to solve the technical problem that the matching between the board cards in the prior art is single. The application provides a communication circuit which comprises a connector, a signal receiving and transmitting circuit, a switching circuit and a switching circuit, wherein the connector comprises a grounding terminal pin, a power supply terminal pin and a signal terminal pin, the signal terminal pin comprises a first signal terminal pin and a second signal terminal pin, a signal transmitting end is used for transmitting signals, a signal receiving end is used for receiving signals, the signal receiving and transmitting circuit comprises a signal transmitting circuit and a signal receiving circuit, the signal transmitting circuit is connected with the signal transmitting end, the signal receiving circuit is connected with the signal receiving end, the switching circuit is connected between the signal transmitting and receiving circuit and the signal terminal pin, the switching circuit has a first state and a second state, when the switching circuit is in the first state, the signal transmitting circuit is communicated with the first signal terminal pin and disconnected with the second signal terminal pin, the signal receiving circuit is communicated with the second signal terminal pin and disconnected with the first signal terminal pin, and when the switching circuit is in the second state, the signal receiving circuit and the signal transmitting circuit are communicated with the same one or both of the first signal terminal pin and the second signal terminal pin. In the alternative technical scheme of the communication circuit, the signal transmitting circuit is connected with the first signal terminal pin, the signal receiving circuit is connected with the second signal terminal pin, the switching circuit comprises a first switching circuit and a second switching circuit, the first switching circuit is connected between the first signal terminal pin and the signal transmitting circuit, one end of the second switching circuit is connected between the first switching circuit and the signal transmitting circuit, the other end of the second switching circuit is connected between the second signal terminal pin and the signal receiving circuit, the first switching circuit is conducted when the switching circuit is in a first state, the second switching circuit is disconnected, the first switching circuit is conducted or disconnected when the switching circuit is in a second state, and the second switching circuit is conducted. In the alternative technical scheme of the communication circuit, the first switching circuit comprises a first switching resistor, the second switching circuit comprises a second switching resistor, the first switching resistor is arranged on the upper part, the second switching resistor is not arranged on the upper part when the switching circuit is in the first state, and the first switching resistor is arranged on the upper part or the lower part when the switching circuit is in the second state, and the second switching resistor is arranged on the upper part. In an alternative solution of the above communication circuit, the first switching resistor and/or the second switching resistor includes a jumper resistor. In the alternative technical scheme of the communication circuit, the signal transmitting circuit is connected with the first signal terminal pin, the signal receiving circuit is connected with the second signal terminal pin, one end of the switching circuit is connected between the first signal terminal pin and the signal transmitting circuit, the other end of the switching circuit is connected between the second signal terminal pin and the signal receiving circuit, the switching circuit is disconnected in the first state, and the switching circuit is conducted in the second state. In the above-mentioned communication circuit's optional technical scheme, communication circuit still includes power end and ground terminal, signal transmission circuit includes first switch tube, first switch tube includes first end, second en