Serial signal double-wire to single-wire communication interface circuit

Abstract

The utility model discloses a serial signal double -line turns single -wire communication interface circuit, it includes signal port Vbus, signal port VDD, signal port Tx, signal port Rx, signal port COM and signal end GND, signal port Vbus: power end of communication interface circuit, signal port VDD: power end of control circuit, signal port Tx: communication signal sending end (signal power switch control end), signal port Rx: communication signal receiving end, signal port COM: signal output input end, this serial signal double -line turns single -wire communication interface circuit, through the improvement signal circuit, integrates signal power switch circuit and transceiver circuit, can make signal power switch control port and signal sending port share an end, reduces the component quantity simultaneously, reduces the circuit cost.

Description

Technical Field

[0001] This utility model relates to the field of communication interface technology, specifically a serial signal two-wire to single-wire communication interface circuit. Background Technology

[0002] In simple terms, a communication interface circuit acts as a "translator" and "traffic policeman" for data exchange between two electronic devices or systems. Its core function is to solve a fundamental problem: how to enable two devices that may use different "languages" (electrical characteristics, data formats, timing) to accurately, reliably, and efficiently transmit digital information to each other. Without a communication interface circuit, direct connection between devices may lead to data errors, device damage, or even failure to communicate.

[0003] In existing technologies, conventional serial communication typically uses two signal ports (Tx and Rx). To save on wiring, the two signals are often converted to a single signal line for transmission and reception (as shown in the diagram). Sometimes, it is necessary to turn off the output signal, thus requiring the addition of a power switch circuit, which in turn adds a control port sw_Vbus, making the circuit more complex and increasing costs. Utility Model Content

[0004] The purpose of this section is to outline some aspects of the embodiments of this utility model and to briefly introduce some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be used to limit the scope of this utility model.

[0005] 1. Technical problems to be solved:

[0006] To address the issues mentioned above, conventional serial communication typically uses two signal ports (Tx and Rx). To save on wiring, it's often necessary to convert the two signals to a single signal line for transmission and reception (as shown in the diagram). Sometimes, it's necessary to turn off the output signal, thus requiring the addition of a power switch circuit, which in turn adds a control port sw_Vbus, complicating the circuit and increasing costs. Therefore, this invention is proposed.

[0007] Therefore, the purpose of this utility model is to provide a serial signal two-wire to single-wire communication interface circuit. By improving the signal circuit and integrating the signal power switch circuit and the transceiver circuit, the signal power switch control port and the signal transmission port can share a single port, while reducing the number of components and lowering the circuit cost.

[0008] 2. Technical Solution:

[0009] To solve the above-mentioned technical problems, according to one aspect of the present invention, the present invention provides the following technical solution:

[0010] A serial signal two-wire to single-wire communication interface circuit includes signal ports Vbus, VDD, Tx, Rx, COM, and GND.

[0011] Signal port Vbus: Power supply terminal of the communication interface circuit;

[0012] Signal port VDD: Power supply terminal for the control circuit;

[0013] Signal port Tx: Communication signal transmitting end (signal power switch control end);

[0014] Signal port Rx: Communication signal receiver;

[0015] COM port: Signal input / output terminal;

[0016] GND (signal terminal): The signal reference ground of the circuit.

[0017] As a preferred embodiment of the serial signal two-wire to single-wire communication interface circuit of this utility model, the circuit further includes NPN transistors Q1, Q4, Q5, and Q6.

[0018] As a preferred embodiment of the serial signal two-wire to single-wire communication interface circuit of this utility model, the circuit further includes Q2 and Q3 as PNP transistors.

[0019] As a preferred embodiment of the serial signal two-wire to single-wire communication interface circuit of this utility model, the circuit further includes R1, R2, R3, R4, R5, R6, R7, R8, R9, and R10, all of which are resistors.

[0020] As a preferred embodiment of the serial signal two-wire to single-wire communication interface circuit of this utility model, the circuit also includes D1, which is a Zener diode to prevent the COM port voltage from being too high.

[0021] As a preferred embodiment of the serial signal two-wire to single-wire communication interface circuit of this utility model, the circuit also includes F1, which is a resettable fuse to prevent excessive COM signal current.

[0022] 3. Beneficial effects:

[0023] Compared with the prior art, the beneficial effects of this utility model are:

[0024] This serial signal two-wire to single-wire communication interface circuit integrates the signal power switch circuit and the transceiver circuit by improving the signal circuit. This allows the signal power switch control port and the signal transmission port to share a single port, while reducing the number of components and lowering the circuit cost. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0026] Figure 1 This is a schematic diagram of the prior art for a serial signal two-wire to single-wire communication interface circuit according to the present invention;

[0027] Figure 2 This is a schematic diagram of an improved serial signal two-wire to single-wire communication interface circuit according to the present invention. Detailed Implementation

[0028] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0029] This utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not adhering to the usual scale. Furthermore, the schematic diagrams are merely examples and should not be construed as limiting the scope of protection of this utility model. In actual manufacturing, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0030] The orientation or positional relationship indicated in the terminology is based on the orientation or positional relationship shown in the accompanying drawings and is only for the convenience of describing the present invention and simplifying the description. It is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0031] The term "connection method" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] The embodiments of this utility model will now be described in further detail with reference to the accompanying drawings.

[0033] This utility model provides an overall structural schematic diagram of an embodiment of a serial signal two-wire to single-wire communication interface circuit, including:

[0034] Please see Figures 1-2 This embodiment of a serial signal two-wire to single-wire communication interface circuit includes signal ports Vbus, VDD, Tx, Rx, COM, and GND.

[0035] Signal port Vbus: Power supply terminal of the communication interface circuit;

[0036] Signal port VDD: Power supply terminal for the control circuit;

[0037] Signal port Tx: Communication signal transmitting end (signal power switch control end);

[0038] Signal port Rx: Communication signal receiver;

[0039] COM port: Signal input / output terminal;

[0040] GND (signal terminal): The signal reference ground of the circuit.

[0041] It is worth noting that the circuit also includes NPN transistors Q1, Q4, Q5, and Q6.

[0042] Next, the circuit also includes PNP transistors Q2 and Q3.

[0043] The circuit also includes R1, R2, R3, R4, R5, R6, R7, R8, R9, and R10, all of which are resistors.

[0044] Furthermore, the circuit also includes D1, which is a Zener diode to prevent the COM port voltage from becoming too high.

[0045] Finally, the circuit also includes F1, which is a resettable fuse to prevent excessive COM signal current.

[0046] In addition, the circuits, electronic components and modules involved in this utility model are all existing technologies, which can be fully implemented by those skilled in the art, and need not be elaborated upon. The content protected by this utility model does not involve any improvement to the internal structure and method.

[0047] Combination Figures 1-2 The specific usage process of the serial signal two-wire to single-wire communication interface circuit of this embodiment is as follows:

[0048] 1. When the transmitted signal is high, Tx is set high, and the base voltage of Q1 is pulled high through R1, so Q1 is turned on. At this time, R2, R3 and Q1 form a loop between Vbus and GND. The voltage between the emitter and base of Q2 is equal to the voltage across resistor R2, so Q2 is turned on. The Vbus voltage is transmitted to the COM terminal through Q2, R4, R5 and F1. At this time, the voltage at the COM terminal is approximately equal to Vbus, and the signal at the COM terminal is high.

[0049] 2. Subsequently, when the transmitted signal is low, Tx is set low, pulling the base voltage of Q1 low through R1, Q1 is cut off. At this time, Vbus and GND are approximately open circuits, the voltages across R2 are the same, the emitter and base voltages of Q2 are approximately 0V, Q2 is cut off; at the same time, the Tx signal pulls the base voltage of Q5 low through R9, Q5 is cut off, the VDD signal pulls the base voltage of Q6 high through R10, Q6 is turned on, the COM terminal forms a loop with F1 and Q6, the voltage at the COM terminal is approximately equal to the GND voltage, presenting a low level;

[0050] 3. Secondly, keeping the Tx terminal at a low level will cause the COM terminal voltage to remain at a low level, which is similar to signal shutdown.

[0051] 4. Next, when receiving a signal, Tx remains at a high level. When the signal input at the COM terminal is high, the voltage at the COM terminal is approximately equal to the Vbus voltage. The sum of the voltage across resistor R4 and the voltage between the emitter and collector of Q2 is approximately 0V. Therefore, the sum of the voltage between the emitter and base of Q3 and the voltage across R6 is approximately 0V, so Q3 is cut off. The voltage across R7 is approximately 0V, so Q4 is cut off. The VDD signal is transmitted to the Rx port through R8. The voltage at the Rx port is approximately equal to the VDD signal voltage, which is at a high level.

[0052] 5. Finally, when the COM input signal is low, the COM voltage is approximately 0V, which is equivalent to COM being shorted to GND. At this time, Q2, R4, R5, and F1 form a circuit between Vbus and GND, creating a voltage divider. The voltage between the emitter and base of Q3 is approximately equal to the difference between the voltages across R4 and R6, so Q3 is turned on. R6, Q3, and R7 form a circuit between Vbus and GND, so the voltage between the base and emitter of Q4 is equal to the voltage across R7, so Q4 is turned on. Q4 shorts the Rx terminal to GND, causing the Rx terminal to present a low level.

[0053] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the features in the embodiments disclosed in this invention can be combined with each other in any way. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A serial signal two-wire to single-wire communication interface circuit, comprising signal port Vbus, signal port VDD, signal port Tx, signal port Rx, signal port COM, and signal terminal GND, characterized in that: Signal port Vbus: Power supply terminal of the communication interface circuit; Signal port VDD: Power supply terminal for the control circuit; Signal port Tx: Communication signal transmitting end (signal power switch control end); Signal port Rx: Communication signal receiver; COM port: Signal input / output terminal; GND (signal terminal): The signal reference ground of the circuit.

2. The serial signal two-wire to single-wire communication interface circuit according to claim 1, characterized in that, The circuit also includes NPN transistors Q1, Q4, Q5, and Q6.

3. The serial signal two-wire to single-wire communication interface circuit according to claim 2, characterized in that, The circuit also includes PNP transistors Q2 and Q3.

4. The serial signal two-wire to single-wire communication interface circuit according to claim 3, characterized in that, The circuit also includes R1, R2, R3, R4, R5, R6, R7, R8, R9, and R10, all of which are resistors.

5. The serial signal two-wire to single-wire communication interface circuit according to claim 4, characterized in that, The circuit also includes D1, which is a Zener diode to prevent the COM port voltage from being too high.

6. The serial signal two-wire to single-wire communication interface circuit according to claim 5, characterized in that, The circuit also includes F1, which is a resettable fuse to prevent excessive current in the COM signal.

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