TW201617913A - Multi-part apparatus, connecting apparatus and connection detection method thereof - Google Patents

Abstract

A multi-part apparatus, a connecting apparatus and a connection detection method thereof are provided. The connecting apparatus includes a connecting interface and a control unit. The connecting interface includes a first common pin and a second common pin, which are symmetrically configured to a central axis of the connecting interface. One of the first and second common pins is coupled to a clock pin of an electronic apparatus, and the other one of the first and second common pins is coupled to a data pin of the electronic apparatus. The control unit is coupled to the first and second common pins. According to a voltage change on the first and second common pins, the control unit determines whether the first common pin is coupled to the clock pin or the data pin, and determines whether the second common pin is coupled to the clock pin or the data pin.

Description

Composite device, connection device and connection detection method thereof

The present invention relates to a connection technology, and more particularly to a composite device, a connection device, and a connection detection method thereof that can provide an electronic device connected to the front or the back.

With the rapid development of technology, electronic devices such as notebook computers, tablet computers, and smart phones have also come out. In addition to providing the user with instant processing and transceiving data, the electronic device can also expand the function of the electronic device by collocation with a connecting device (such as a dock), thereby improving the operational convenience of the electronic device.

For example, Figures 1A-1C are schematic illustrations of an electronic component. Referring to FIG. 1A, the electronic component 10 includes a connecting device 12 and an electronic device 14. When the electronic device 14 is assembled to the connection device 12, the ports 122, 142 are connected for power transmission or data transmission. Depending on the direction of assembly, the display surface 144 of the electronic device 14 can be oriented (as in FIG. 1A) or back to the input interface 126 of the connection device 12, hereinafter referred to as "front" and "reverse" connections, respectively.

FIG. 1B and FIG. 1C respectively illustrate the case where the electronic device 14 is connected to the connecting device 12 in front and back. Taking the ports 122 and 142 as the bus interface of the Inter-Integrated Circuit (I2C) as an example, the pin group of the port 142 is configured with the ground pin GND3, the power pin PWR3, and the detection terminal from left to right. The foot DET3, the clock pin CLK3, the data pin DAT3 and the interrupt pin INT3, and the port 122 can be sequentially arranged from the center to the two sides, respectively, the interrupt pin INT, the data pin DAT1, DAT2, the clock pin CLK1 CLK2, detection pin DET1, DET2, power pin PWR1, power pin PWR2, and ground pins GND1, GND2. The clock pins CLK1 and CLK2 are respectively connected to the clock pin CLK of the embedded controller 124 to transmit the clock signal, and the data pins DAT1 and DAT2 are respectively connected to the data pin DAT of the embedded controller 124 for transmission. Information signal.

In other words, the current technology must configure the pins in the port 122 in pairs, and is equivalent to the pin group configuring the two sets of ports 142, so that the electronic device 14 can realize the front connection of FIG. 1B and the reverse side of FIG. 1C. connection. However, the above practice will result in high manufacturing costs due to the limitation of the number of pins.

In view of this, the present invention provides a composite device, a connection device, and a connection detecting method thereof, which can connect the electronic device on both sides and effectively reduce the number of pins.

The invention proposes a connecting device. The connecting device includes a connection interface and a control unit. The connection interface includes first and second common pins that are symmetric with respect to a central axis of the connection interface for configuration. Wherein the first and second common pins are One of the first and second common pins is coupled to the data pin of the electronic device. The control unit is coupled to the first and second common pins. The control unit determines that the first common pin is coupled to the clock pin or the data pin according to the voltage change on the first and second common pins, and determines that the second common pin is coupled to the clock pin or the data Pin.

The invention further provides a connection detection method for a connection device. The connection detection method includes the following steps. The first and second common pins are provided symmetrically about a central axis of the connection interface for configuration. The one of the first and second common pins is coupled to the clock pin of the electronic device, and the other of the first and second common pins is coupled to the data pin of the electronic device. Determining that the first common pin is coupled to the clock pin or the data pin according to the voltage change on the first and second common pins, and determining that the second common pin is coupled to the clock pin or the data pin .

The invention further provides a composite device. The composite device includes an electronic device and a connection device. The electronic device includes a first control unit and a first connection interface. The first connection interface includes a first clock pin and a first data pin, which are respectively coupled to the first control unit. The connecting device includes a second connection interface and a second control unit. The second connection interface includes first and second common pins that are symmetric with respect to a central axis of the second connection interface for configuration. The one of the first and second common pins is coupled to the first clock pin, and the other of the first and second common pins is coupled to the first data pin. The second control unit is coupled to the first and second common pins. The second control unit determines that the first common pin is coupled to the first clock pin or the first data pin according to the voltage change on the first and second common pins, and determines the second common connection The pin is coupled to the first clock pin or the first data pin.

Based on the above, the composite device, the connection device and the connection detection method thereof according to the embodiments of the present invention use the two common pins on the connection interface of the connection device to transmit the clock signal and the data signal, and according to the common pin The voltage change determines whether the electronic device is connected to the connection device in front or back. Thereby, the function of the double-sided connection between the connection device and the electronic device can be realized, and the number of pins can be effectively reduced to reduce the manufacturing cost.

The above described features and advantages of the invention will be apparent from the following description.

10‧‧‧Electronic components

GND‧‧‧ Grounding voltage

12, 21‧‧‧Connecting device

GPA0, GPA1‧‧‧ control signals

122, 142‧‧‧ Connections

L‧‧‧ center axis

124‧‧‧ embedded controller

M1~M4‧‧‧O crystal

126‧‧‧Input interface

R1~R8‧‧‧ resistance

14, 25‧‧‧ Electronic devices

VDD‧‧‧Power supply voltage

144‧‧‧ display surface

S402~S404‧‧‧Steps

20‧‧‧Composite device

COM1, COM2‧‧‧ common feet

22, 26‧‧‧ Connection interface

DET1~DET3‧‧‧Detection pin

23‧‧‧Switching circuit

GND1~GND3‧‧‧ Grounding Pin

24, 27‧‧‧Control unit

PWR1~PWR3‧‧‧ power pin

CLK, CLK1~CLK3, DCK, PCK‧‧‧ clock pin

DAT, DAT1~DAT3, DDA, PDA‧‧‧ data pin

INT, INT3, DINT, PINT‧‧‧ interrupt pins

1A to 1C are schematic views of an electronic component.

2A and 2B are block diagrams of a composite device according to an embodiment of the invention.

3 is a block diagram of a composite device in accordance with an embodiment of the invention.

FIG. 4 is a flow chart of a method for detecting connection of a connection device according to an embodiment of the invention.

The composite device, the connecting device and the connection detecting method thereof according to the embodiments of the present invention use two common pins of the connecting device to transmit the clock signal and the data signal By inputting and detecting the electronic device by the voltage change on the common pin, the electronic device is connected to the connecting device on the front or the back, which can effectively reduce the number of pins and realize the double-sided connection function between the connecting device and the electronic device. In addition, the interface authentication procedure between the connection device and the electronic device and related settings can be performed by a common pin to enhance the expandability of the connection device by utilizing the communication function of the internal integrated circuit protocol.

2A and 2B are block diagrams of a composite device according to an embodiment of the invention. Referring first to FIG. 2A, the composite device 20 of the present embodiment includes an electronic device 25 and a connection device 21. The electronic device 25 is, for example, a portable electronic device such as a tablet computer or a smart phone. The connection device 21 is, for example, a device having a connection interface such as a cradle or a keyboard, and the type thereof is not limited thereto. The electronic device 25 includes a connection interface 26 and a control unit 27. The connection device 21 includes a connection interface 22 and a control unit 24. The connection interfaces 26, 22 are, for example, internal integrated circuit bus bars. The control units 27, 24 are, for example, devices or components having processing capabilities such as embedded controllers, microprocessors, and the like.

In the present embodiment, the connection interface 22 may include common pins COM1, COM2 that are symmetric with respect to the central axis L of the connection interface 22 for configuration. The one of the common pins COM1 and COM2 can be coupled to the clock pin CLK3 of the electronic device 25, and the other of the common pins COM1 and COM2 can be coupled to the data pin DAT3 of the electronic device 25.

Specifically, the grounding pin GND1, the power pin PWR1, the common pin COM1, the interrupt pin INT, the common pin COM2, the power pin PWR2, and the ground pin GND2 may be sequentially arranged from left to right in the connection interface 22. . The interrupt pin INT is disposed between the common pins COM1 and COM2 and is located at the connection interface. 22 is on the central axis L. The power pins PWR1 and PWR2 are symmetrically disposed on the central axis L and coupled to the power supply voltage VDD, respectively. The ground pins GND1 and GND2 are symmetrically disposed on the central axis L and coupled to the ground voltage GND, respectively.

On the other hand, in the connection interface 26 of the electronic device 25, the ground pin GND3, the power pin PWR3, the clock pin CLK3, the interrupt pin INT3, and the data pin DAT3 can be sequentially arranged from left to right. Thereby, the respective pins of the electronic device 25 and the connecting device 21 can be brought into contact with each other by the connection manner of FIG. 2A or FIG. 2B, thereby realizing the function of front or back connection.

The control unit 27 is coupled to the clock pin CLK3 and the data pin DAT3, and the control unit 24 is coupled to the common pins COM1 and COM2. The control unit 24 determines that the common pin COM1 is coupled to the clock pin CLK3 or the data pin DAT3 according to the voltage change on the common pins COM1 and COM2, and determines that the common pin COM2 is coupled to the clock pin CLK3. Or data pin DAT3.

It should be noted that when the electronic device 25 is connected to the connecting device 21 as shown in FIG. 2A, the common pins COM1 and COM2 can be respectively coupled to the clock pin CLK3 and the data pin DAT3. When the electronic device 25 is connected to the connecting device 21 on the reverse side as shown in FIG. 2B, the common pins COM1 and COM2 are respectively coupled to the data pins DAT3 and CLK3. The present invention is not limited to the above-described front or back connection.

Specifically, in an embodiment, the voltage level on the common pins COM1 and COM2 can be changed according to the clock signal sent by the electronic device 25 via the clock pin CLK3. More specifically, when the voltage level on the common pin COM1 changes according to the clock signal, the control unit 24 can determine that the common pin COM1 is coupled to the time. The pin CLK3 is coupled to the data pin DAT3. In contrast, when the voltage level on the common pin COM2 changes according to the clock signal, the control unit 24 can determine that the common pin COM1 is coupled to the data pin DAT3, and the common pin COM2 is coupled to the clock. Pin CLK3.

For example, the voltage levels of the common pins COM1, COM2, the clock pin CLK3, and the data pin DAT3 can be initialized to a high voltage level (enable level). When the electronic device 25 is connected to the connection device 21 and sends a low voltage level (disabling level) clock signal via the clock pin CLK3, if the electronic device 25 is connected to the connection device 21 on the front side (as shown in FIG. 2A), The common pin COM1 will receive the clock signal and convert to a low voltage level. If the electronic device 25 is connected to the connecting device 21 on the reverse side (as shown in FIG. 2B), the clock signal is received by the common pin COM2 and converted to a low voltage level. Therefore, by changing the voltage level on the common pins COM1 and COM2, it can be judged that the electronic device 25 is connected to the connection device 21 on the front or back side.

Next, the detailed device architecture of this embodiment will be described. Please refer to FIG. 3. FIG. 3 is a block diagram of a composite device according to an embodiment of the invention. Here, the electronic device 25 is connected to the connecting device 21 on the front side, and only a part of the connecting interfaces 22, 26 are shown for convenience of explanation. The control unit 27 connects the clock pin CLK3 and the data pin DAT3 through the clock pin PCK and the data pin PDA to respectively transmit the clock signal and the data signal. In other words, the circuit operations of the clock pins PCK and CLK3 are substantially the same, and the circuit operations of the data pins PDA and DAT3 are substantially the same. Therefore, the clock pin PCK and the data pin PDA are collectively described below.

The connecting device 21 can communicate with the common pins COM1 and COM2 respectively The clock pin PCK of the sub-device 25 and the data pin PDA are connected. In the connection device 21, the coupling relationship between the clock pin DCK, the data pin DDA and the common pins COM1 and COM2 included in the control unit 24 can be determined by the switching circuit 23.

In detail, in an embodiment, the switching circuit 23 is coupled between the common pins COM1, COM2 and the control unit 24, and can establish a first transmission path according to the control signals GPA0, GPA1, thereby sharing the common pin COM1. The clock pin DCK or the data pin DDA is coupled to the control unit 24, and the second transmission path is established according to the control signals GPA0, GPA1, thereby coupling the common pin COM2 to the clock pin DCK of the control unit 24. Or data pin DDA. The control unit 24 can determine the voltage levels of the control signals GPA0 and GPA1 according to the voltage changes on the common pins COM1 and COM2, and the control signals GPA0 and GPA1 are mutually inverted.

Specifically, the switching circuit 23 of the present embodiment includes transistors M1 to M4 (for example, NMOS transistors). The transistors M1~M2 are controlled by the control signal GPA0, and the transistors M3~M4 are controlled by the control signal GPA1. Taking the clock signal of the low voltage level as an example, when the connection device 21 is connected to the electronic device 25 and the common pin COM1 receives the clock signal and transitions to the low voltage level, the control unit 24 can determine that the control signal GPA0 is high. The voltage level is, and the control signal GPA1 is at a low voltage level. At this time, the transistors M1 to M2 are turned on and the transistors M3 to M4 are turned off, so that the common pin COM1 is connected to the clock pin DCK through the first transmission path, and the common pin COM2 is connected to the data pin DDA through the second transmission path. .

Thereby, the control unit 24 can determine that the electronic device 25 is connected to the connecting device 21 on the front or the back, and further determines the common pin through the switching circuit 23. COM1, COM2, the transmission path between the DCK and the data pin DDA, so that the electronic device 25 is connected to the connection device 21 on the front or the back, and the clock pin PCK and the data pin PDA of the electronic device 25 are both The clock pin DCK and the data pin DDA of the connection device 21 can be respectively connected.

It should be noted that the switching circuit 23 can also generate the control signal GPA1 by inverting the control signal GPA0, or can also use the PMOS transistor as the transistors M3~M4 and control the transistors M1~M4 only by the control signal GPA0. to realise.

In particular, in an embodiment, the connection device 21 can be initially set to a Power On state. At this time, the common pins 6OM1, COM2, the clock pin DCK and the data pin DDA of the connection device 21 are not connected to the electronic device 25, and are respectively received by the resistors R1 to R4 to receive the power supply voltage VDD and are raised to a high voltage level.

Considering that the operation timing of each component inside the device may be difficult to control, in an embodiment, the control unit 27 of the electronic device 25 may provide the power supply voltage VDD to the clock pin DCK after determining that the connection device 21 is connected to the electronic device 25. And data pin DDA. Specifically, in an embodiment, the electronic device 25 can detect whether the connection interface 22 is connected to generate a detection signal through the interrupt pin INT3. When the control unit 27 determines to connect to the connection interface 22 according to the detection signal, the control unit 27 can supply the power supply voltage VDD to initialize the voltage levels of the common pins COM1 and COM2.

As shown in FIG. 3, the interrupt pin INT of the connection device 21 can be coupled to the ground voltage GND through the resistor R8, and the control unit 24 obtains the voltage level on the interrupt pin INT through the interrupt pin DINT. In addition, the interrupt pin INT3 of the electronic device 25 can be coupled to the power supply voltage VDD through the resistor R7, and the control unit 27 transmits The voltage pin on the interrupt pin INT3 is obtained by interrupting the pin PINT.

Based on the above architecture, if the interrupt pins INT and INT3 are not connected, the interrupt pin INT3 will be raised to the power supply voltage VDD. When the interrupt pins INT and INT3 are connected, the voltage level on the interrupt pin INT3 will be pulled down to the ground voltage GND. In other words, the control unit 27 can use the voltage level on the interrupt pin INT3 as the detection signal, and determine whether to connect with the connection interface 22 according to whether the voltage level on the interrupt pin INT3 or the interrupt pin PINT is pulled low.

Therefore, the control unit 27 can supply the power supply voltage VDD to the connection device 21 after determining that the connection device 21 is connected to the electronic device 25, so as to respectively transmit the common pins COM1, COM2, the clock pin DCK through the resistors R1 R R4 and The data pin DDA is initialized to a high voltage level, thereby completing the initial setting of the connection device 21.

As for the initial setting of the electronic device 25, the clock pin PCK can be pulled down to the ground voltage GND through the resistor R5, and the data pin PDA can be raised to the power supply voltage VDD through the resistor R6. Therefore, when the electronic device 25 is connected to the connection device 21, the high voltage level on the common pins COM1, COM2 will cause the clock pin PCK to be raised to a high voltage level. In other words, the electronic device 25 can also determine whether to connect to the connection device 21 according to the voltage change on the clock pin PCK.

Based on the above, the following table 1 lists the connection device 21 in "initial state 1" (unpowered and not connected to the electronic device 25), "initial state 2" (unpowered and connected to the electronic device 25), "initial state" 3 (in the case of power-on and connection to the electronic device 25), the individual voltage levels of the clock pin PCK, DCK, data pin PDA, DDA, interrupt pin PINT and control signals GPA0, GPA1. Among them, "1" stands for high The voltage level, "0" represents the low voltage level, and "X" represents the floating value.

It is worth mentioning that, in an embodiment, after the connection device 21 is connected to the electronic device 25, the control unit 27 can also perform an interface authentication procedure by using the common pins COM1, COM2 of the connection device 21 to pass the handshake ( The Handshaking process authenticates the clock pins PCK, DCK and data pins PDA, DDA, and sets the pins as internal integrated circuit interfaces for communication.

The following describes the flow of the interface authentication program with Figure 3. First, when the electronic device 25 is connected to the connection device 21, the clock pins PCK, DCK and the data pins PDA, DDA can be initialized to a high voltage level, and the control unit 27 can cause the control unit 24 to respectively control the control signal GPA0, The GPA1 is set to the high voltage level and the low voltage level, so that the clock pin DCK is coupled to the clock pin PCK through the common pin COM1, and the data pin PDA is coupled to the data pin DDA through the common pin COM2.

Next, the electronic device 25 can pull down the clock pin PCK to a low voltage level. The signal of the low voltage level can be regarded as the first request signal of the interface authentication program. In other words, the electronic device 25 can transmit the first request signal to the clock pin DCK of the connection device 21 through the clock pin PCK, so that the clock is connected. The pin DCK receives the low voltage level of the first request signal, and causes the connection device 21 to react to the first request signal to adjust the resource. The voltage level on the material pin DDA is at a low voltage level, and the data pin PDA of the electronic device 25 receives the low voltage level. The signal of the low voltage level can be regarded as the second request signal, that is, the connecting device 21 can transmit the second request signal to the data pin PDA of the electronic device 25 through the data pin PDA.

Therefore, when the electronic device 25 adjusts the voltage level on the data pin PDA in response to the voltage level on the data pin DDA of the connection device 21, the electronic device 25 can make the clock pin PCK and the connecting device. The clock pin DCK of 21 is connected, and the data pin PDA is connected to the data pin DDA of the connecting device 21. At this time, the handshake process of the interface authentication program is completed, thereby authenticating and setting the clock pins PCK, DCK and the data pins PDA, DDA to the internal integrated circuit interface for transmission, and enabling the control units 24 and 27 to perform communication. The above process can also be applied to the case where the electronic device 25 is connected to the connecting device 21 on the reverse side, and the setting of the enabling or disabling level can also be adjusted, and details are not described herein.

Table 2 below lists the connection device 21 in the "initial state", "authentication step 1" (receive the first request signal), "authentication step 2" (in response to the first request signal), the clock pin PCK, DCK , data pin PDA, DDA, interrupt pin PINT and control signals GPA0, GPA1 their individual voltage levels. Among them, "1" represents the high voltage level, and "0" represents the low voltage level. Two values listed in the same field may correspond to the case where the electronic device 25 is connected to the connecting device 21 in front/back.

Table II

In an embodiment, Tables 1 and 2 may also be established as a lookup table that can be used to compare and determine the connection of the electronic device 25 to the connection device 21.

In another aspect, an embodiment of the present invention provides a connection detection method for a connection device. Please refer to FIG. 4. FIG. 4 is a flowchart of a method for detecting connection of a connection device according to an embodiment of the invention. In step S402, the first and second common pins are symmetrically disposed on the central axis of the connection interface for configuration, wherein one of the first and second common pins is coupled to the clock pin of the electronic device, first And the other of the second common pins is coupled to the data pin of the electronic device. In step S404, according to the voltage change on the first and second common pins, it is determined that the first common pin is coupled to the clock pin or the data pin, and the second common pin is coupled to the clock pin. Foot or data pin.

In summary, the composite device, the connecting device and the connection detecting method thereof according to the embodiments of the present invention can transmit the clock signal and the data signal by using two common pins of the connecting device, and change the voltage on the common pin. It is judged that the electronic device is connected to the connecting device in front or back. In addition, an interface authentication procedure can be performed between the electronic device and the connection device through a common pin to communicate with each other by using an internal integrated circuit protocol. Thereby, the embodiment of the invention can effectively reduce the number of pins of the connecting device and improve the expandability.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any one of ordinary skill in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of the invention is defined by the scope of the appended claims.

20‧‧‧Composite device

21‧‧‧Connecting device

22, 26‧‧‧ Connection interface

24, 27‧‧‧Control unit

25‧‧‧Electronic devices

CLK3‧‧‧ clock pin

COM1, COM2‧‧‧ common feet

DAT3‧‧‧ data pin

GND1~GND3‧‧‧ Grounding Pin

INT, INT3‧‧‧ interrupt pin

L‧‧‧ center axis

PWR1~PWR3‧‧‧ power pin

Claims (10)

A connecting device for connecting an electronic device, the connecting device comprising: a connecting interface, comprising: a first and a second common pin, symmetrically arranged with a central axis of the connecting interface, wherein the first One of the first common pins is coupled to a first clock pin of the electronic device, and the other of the first and second common pins is coupled to a first data pin of the electronic device; And a control unit coupled to the first and second common pins, wherein the control unit determines that the first common pin is coupled to the first time according to a voltage change on the first and second common pins a pulse pin or the first data pin, and determining that the second common pin is coupled to the first clock pin or the first data pin. The connecting device of claim 1, wherein the voltage levels on the first and second common pins are changed according to a clock signal sent by the electronic device via the first clock pin. The connection device of claim 2, wherein when the voltage level of the first common pin changes according to the clock signal, the control unit determines that the first common pin is coupled to the first a clock pin, wherein the second common pin is coupled to the first data pin, and when the voltage level of the second common pin changes according to the clock signal, the control unit determines the first The common pin is coupled to the first data pin, and the second common pin is coupled to the first clock pin. The connecting device of claim 1, wherein the connecting device further comprises: a switching circuit coupled between the first and second common pins and the control unit to establish a first transmission path to couple the first common pin to the first and second control signals a second clock pin or a second data pin of the control unit, and establishing a second transmission path to couple the second common pin to the second clock pin or the second of the control unit a data pin, wherein the control unit determines a voltage level of the first and second control signals according to a voltage change on the first and second common pins, and the first and second control signals are mutually inverted . The connection device of claim 1, wherein the electronic device further includes a first interrupt pin disposed between the first clock pin and the first data pin for detecting whether Connecting the connection interface to generate a detection signal, wherein when the electronic device determines to connect the connection interface according to the detection signal, the electronic device provides a power supply voltage to initialize the first and second common pins of the connection device The voltage level on the top. The connection device of claim 5, wherein the connection interface further comprises: a second interrupt pin disposed between the first and second common pins for pulling down the first interrupt pin a voltage level on the electronic device to generate the detection signal; a first and a second power pin symmetrical to the central axis of the connection interface for being coupled to the power supply voltage; and a first And the second grounding pin is symmetrically disposed to the central axis of the connection interface and coupled to the ground voltage. A method for detecting a connection of a connecting device includes: providing a first and second common pin symmetrically to a central axis of a connection interface for configuration, wherein one of the first and second common pins is coupled a first clock pin of the electronic device, the other of the first and second common pins being coupled to a first data pin of the electronic device; and according to the first and second common pins a voltage change to determine that the first common pin is coupled to the first clock pin or the first data pin, and determining that the second common pin is coupled to the first clock pin or the The first data pin. The connection detection method of claim 7, wherein the electronic device further performs an initialization process, and the step of the initialization process includes: detecting whether the connection interface is connected to generate a detection signal; When the detection signal determines that the connection interface is connected, a power supply voltage is provided to initialize a voltage level on the first and second common pins of the connection device. The connection detection method of claim 7, wherein the electronic device further performs an interface authentication procedure, and the step of the interface authentication procedure comprises: transmitting a second clock pin of the connection device through the A first pin is coupled to the first clock pin of the electronic device, and a second data pin of the connecting device is coupled to the first data connector of the electronic device through the second common pin Sending a first request signal to the second clock pin of the connecting device through the first clock pin, causing the connecting device to react to the first request signal to adjust the second data pin Voltage level to transmit a second request signal to the first data pin of the electronic device; When the voltage level on the first data pin is adjusted in response to the voltage level on the second data pin of the connection device, the first clock pin and the second clock of the connection device are caused Connecting the pins, and connecting the first data pin to the second data pin of the connecting device, and authenticating and setting the first and second clock pins and the first and second data pins The internal integrated circuit interface is used for transmission. A composite device includes: an electronic device, comprising: a first control unit; and a first connection interface, including a first clock pin and a first data pin, respectively coupled to the first control unit And a connecting device, comprising: a second connecting interface, comprising a first and second common pins symmetrically disposed on a central axis of the second connecting interface, wherein the first and second common pins One of the first and second common pins is coupled to the first data pin; and the second control unit is coupled to the first And the second common pin, the second control unit is configured to determine that the first common pin is coupled to the first clock pin or the first data connection according to the voltage change on the first and second common pins And determining that the second common pin is coupled to the first clock pin or the first data pin.