WO2016168987A1

WO2016168987A1 - Solution for mutually identifying forward and reverse insertion between touch type usb devices

Info

Publication number: WO2016168987A1
Application number: PCT/CN2015/077104
Authority: WO
Inventors: 张慧敏; 宋刚; 吴彬
Original assignee: 华为技术有限公司
Priority date: 2015-04-21
Filing date: 2015-04-21
Publication date: 2016-10-27
Also published as: CN106462512A; CN106462512B

Abstract

A solution for mutually identifying forward and reverse insertion between touch type USB devices, which is applied to the field of mobile terminals. The solution comprises: on one hand, a terminal processor (24) indicates, according to a result of comparison between a level of a fifth pin of a terminal USB interface (20) and a reference level and a level value of the fifth pin of the terminal USB interface (20), a working state of a changeover switch (23) so as to connect the terminal USB interface (20) and a processor USB interface or disconnect the terminal USB interface (20) from a processor USB interface, and when the terminal USB interface (20) and the processor USB interface are connected, the changeover switch (23) enables, according to the indication of the processor (24), a power pin, first data transmission pin, second data transmission pin and detection pin of the processor (24) to be connected to first, second, fourth and fifth pins of the terminal USB interface (20), respectively, or to be connected to the fifth, fourth, second and first pins of the terminal USB interface (20); and on the other hand, a USB device processor identifies, according to a logic level of the detection pin, whether a USB device is connected to the terminal USB interface (20).

Description

A scheme for mutual recognition of positive and negative insertion between contact type USB devices

Technical field

Embodiments of the present invention relate to the field of mobile terminal technologies, and in particular, to a scheme for positive and negative insertion mutual recognition between contact type USB devices.

Background technique

The USB device is connected to the terminal, generally adopting a USB port of a connector mode or a contact mode. Currently, the forward and reverse insertion is implemented by adding a row of pins to the USB device or the terminal structure, that is, in the USB device or Two sets of power pins, a first data transmission pin, a second data transmission pin, and a detection pin are disposed on the terminal.

Increasing the pins can cause the connector to increase in size and affect the appearance of the product.

Summary of the invention

In order to solve the problem in the prior art that the connector is increased in size and the connector is increased in size and the appearance of the product is affected by the addition of the pin, the embodiment of the present invention adopts the following technical solutions:

In a first aspect, an embodiment of the present invention provides a terminal, where the terminal includes a terminal USB interface, a pull-up resistor, a comparator, an ADC converter, a switch, and a processor:

The terminal USB interface is connected to the USB device, and includes five pins, which are: a first pin, a second pin, a ground pin, a fourth pin, and a fifth pin; Center, the other four pins are symmetrically arranged; the processor is provided with a processor USB interface including a power pin, a first data transmission pin, a ground pin, a second data transmission pin, and a detection pin; The ground pin of the terminal USB interface and the ground pin of the USB interface of the processor are grounded;

The pull-up resistor has one end connected to the first power source and the other end electrically connected to the fifth pin of the terminal USB interface;

The comparator includes a first input pin, a second input pin, an output pin, the first input pin is electrically connected to a fifth pin of the terminal USB interface, and the second input pin is a reference level electrical connection, the output pin being electrically coupled to the processor; the comparator for comparing a level of a fifth pin of the terminal USB interface with the reference level and comparing Result delivery Giving the processor; the level value of the reference level is less than the first power level value;

The ADC converter is electrically connected to a fifth pin of the terminal USB interface and a processor; and is configured to detect a level value of a fifth pin of the USB interface of the terminal;

The switch is respectively connected to the USB interface of the terminal and the USB interface of the processor, and the switch is connected to the USB interface of the terminal according to the instruction of the processor. When the terminal USB interface is connected to the USB interface of the processor, the switch performs a power pin, a first data transfer pin, a second data transfer pin of the processor according to the instruction of the processor, The detecting pin is respectively connected to the first pin, the second pin, the fourth pin, the fifth pin of the terminal USB interface, or the fifth pin, the fourth pin, the second pin of the terminal USB interface , the first pin is connected;

The processor is electrically connected to the comparator, the ADC converter, and the switch; and is configured to indicate the operation of the switch according to the comparison result transmitted by the comparator and the level value of the fifth pin of the terminal USB interface transmitted by the ADC converter status.

In conjunction with the first aspect, in a first possible implementation manner of the first aspect, the processor, according to a comparison result delivered by the comparator, indicates an operating state of the switch, including:

When the processor receives a comparison result that the fifth terminal level of the terminal USB interface passed by the comparator is higher than the reference level of the comparator, the processor instructs the switch to operate in the off state.

With reference to the first aspect, and the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the USB device includes: a USB interface, including five pins: a power pin, a first data transmission pin, a ground pin, a second data transfer pin, and a detection pin; a second resistor, one end electrically connected to the detecting pin, and the other end is grounded; the third resistor, one end and the The power pin is electrically connected, and the other end is grounded; the USB device is centered on the ground pin, and the other four pins are symmetrically arranged. The pin order of the USB interface is: power pin, first data Transfer pin, ground pin, second data transfer pin, and sense pin.

In conjunction with the second possible implementation of the first aspect, in a third possible implementation of the first aspect, the processor is configured according to a comparison result transmitted by the comparator and a fifth end of the terminal USB interface transmitted by the ADC converter The level value of the pin indicates the working state of the switch, including:

When the processor receives the comparison result of the fifth pin level of the terminal USB interface passed by the comparator lower than the reference level of the comparator, and the processor receives the terminal USB interface transmitted by the ADC converter, the fifth When the level value of the pin is VDD*R2/(R1+R2), the processor instructs the switch to operate in the connected state, so that the power pin of the processor, the first data transfer pin, the second data transfer pin, The detecting pins are respectively electrically connected to the first pin, the second pin, the fourth pin, and the fifth pin of the terminal USB interface, wherein VDD is a level value of the first power source, and R1 is the pull-up The resistance value of the resistor, and R2 is the resistance value of the second resistor.

In conjunction with the second and third possible implementations of the first aspect, in a fourth possible implementation of the first aspect, the processor is configured according to a comparison result transmitted by the comparator and a terminal USB interface transmitted by the ADC converter The level value of the fifth pin indicates the working state of the switch, including:

When the processor receives the comparison result of the fifth pin level of the terminal USB interface transmitted by the comparator being lower than the reference level of the comparator, and the processor receives the level of the fifth pin of the terminal USB interface transmitted by the ADC converter When the value is VDD*R3/(R1+R3), the processor instructs the switch to operate in the connected state, so that the detection pin, the second data transfer pin, the first data transfer pin, and the power pin of the processor are respectively The first, second, fourth, and fifth pins of the terminal USB interface are electrically connected, wherein VDD is a level value of the first power source, R1 is a resistance value of the pull-up resistor, and R3 is The resistance value of the third resistor.

In conjunction with the fourth possible implementation of the first aspect, in a fifth possible implementation manner of the first aspect, the processor is based on a comparison result transmitted by the comparator and a fifth end of the terminal USB interface transmitted by the ADC converter The level value of the pin indicates the working state of the switch, including:

When the processor receives the comparison result of the fifth pin level of the terminal USB interface transmitted by the comparator being lower than the reference level of the comparator, and the processor receives the level of the fifth pin of the terminal USB interface transmitted by the ADC converter When the value is other than VDD*R2/(R1+R2) and VDD*R3/(R1+R3), the processor instructs the switch to operate in the off state.

In conjunction with the first aspect and the first to fifth possible implementations of the first aspect, in a sixth possible implementation of the first aspect, the pin of the terminal USB interface is a contact type.

In a second aspect, an embodiment of the present invention provides a USB device, where the USB device includes:

USB interface, comprising five pins: a power pin, a first data transfer pin, a ground pin, a second data transfer pin, and a detection pin;

The USB device is centered on the ground pin, and the other four pins are symmetrically arranged. The USB pin sequence is: a power pin, a first data transfer pin, a ground pin, and a second data transfer pin. Inspection Measuring pin

a second resistor, one end is electrically connected to the detecting pin, and the other end is grounded;

a third resistor, one end is electrically connected to the power pin, and the other end is grounded;

The resistance of the second resistor and the resistance of the third resistor are not equal.

In conjunction with the second aspect, in a first possible implementation of the second aspect, the pin of the USB device is a contact type.

With reference to the second aspect, in a second possible implementation manner of the second aspect, the USB device further includes:

And a processor, connected to the USB interface, for identifying whether the USB device is connected to the terminal USB interface according to the logic level of the detection pin.

The device provided by the embodiment of the invention only needs one row of USB pins, that is, only one set of power pins, the first data transmission pin, the ground pin, the second data transmission pin, and the detection pin are required to be greatly improved. In the prior art, the USB connector pins are structurally added to realize the mutual recognition of the forward and reverse insertion of the USB device, which leads to an increase in the size of the connector and affects the appearance of the product, thereby improving the user experience.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention, Those skilled in the art can also obtain other drawings based on these drawings without paying any creative work.

Figure 1 is a schematic view of a first embodiment of the present invention;

Figure 2 is a flow chart of the first embodiment of the present invention.

Figure 3 is a schematic view of a second embodiment of the present invention;

Figure 4 is a schematic view of a second embodiment of the present invention;

Figure 5 is a schematic view of a second embodiment of the present invention;

Figure 6 is a flow chart of a third embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

Embodiment 1:

An embodiment of the present invention provides a contact type USB device. As shown in FIG. 1 , an embodiment of a USB device according to the present invention is provided. In an embodiment, the USB device includes:

USB interface 10, including 5 pins: power supply pin (VBUS), first data transfer pin (D+ or D-), ground pin (GND), second data transfer pin (D- or D+), Detection pin (ID);

The data transmission pin of the USB device USB interface is as follows:

When the first data transmission pin is D+, the second data transmission pin is D-; or

When the first data transmission pin is D-, the second data transmission pin is D+;

The USB device is centered on the ground pin and the other four pins are symmetrically arranged. Referring to Figure 1, the interface pins of the USB device are: power pin, first data transfer pin, ground pin, and second data. Transmission pin, detection pin;

The USB device further includes:

a second resistor R2, one end is electrically connected to the detecting pin of the USB device, and the other end is grounded;

a third resistor R3, one end is electrically connected to a power pin of the USB device, and the other end is grounded;

The resistance of the second resistor R2 and the resistance of the third resistor R3 are not equal;

Optionally, the USB device may further include a processor 11, and is connected to the USB interface, for identifying whether the USB device is inserted into the terminal according to the logic level of the detection pin, that is, connecting the terminal USB interface;

The processor 11 identifies the USB device insertion terminal according to the first logic level of the detection pin, and identifies that the USB device is not inserted into the terminal according to the second logic level of the detection pin;

The first logic level is a high level, and the second logic level is a low level; the first logic level is a low level, and the second logic level is a high level; It can be set according to the actual circuit design.

For convenience of explanation, taking the first logic level as the high level and the second logic level as the low level, the processor identifies whether the USB device is inserted into the terminal flow chart, see FIG. 2:

Step 201: The processor determines the level of the detection pin is high and low, when the level of the detection pin is high level, step 202 is performed, when the level of the detection pin is low level, step 203 is performed;

Step 202: The processor recognizes that the USB device is inserted into the terminal according to the high level of the detection pin.

Step 203: The processor identifies that the USB device is not inserted into the terminal according to the low level of the detection pin.

Embodiment 2:

The embodiment of the present invention provides a terminal. As shown in FIG. 3, the terminal includes a terminal USB interface 20, a pull-up resistor, a comparator 21, an ADC converter 22, a switch 23, and a processor 24:

The terminal USB interface 20 includes five pins, which are: a first pin, a second pin, a third pin (ie, a ground pin), a fourth pin, a fifth pin, and a ground pin. For the center, the other four pins are symmetrically arranged, and the pin sequence of the terminal USB interface 20 is the first pin, the second pin, the third pin (ie, the ground pin), the fourth pin, and the fifth tube. The ground pin of the terminal USB interface is grounded; the processor has a processor USB interface including a power supply pin (VBUS), a first data transmission pin (D+ or D-), and a ground pin (GND). a second data transmission pin (D- or D+), a detection pin (ID), the ground pin of the processor USB interface is grounded; the switch is respectively connected to the terminal USB interface and the processor Connected to the USB interface, the switch is connected or disconnected from the USB interface of the processor according to the indication of the processor; when the USB interface of the terminal and the USB interface of the processor When connected, the switch performs a power pin, a first data transfer pin, and a second data transfer pin of the USB interface of the processor according to the instruction of the processor. The detecting pin is respectively connected to the first pin, the second pin, the fourth pin, the fifth pin of the terminal USB interface, or the fifth pin, the fourth pin, the second tube of the terminal USB interface The foot and the first pin are connected;

The data transmission pin of the processor USB interface is as follows:

The data transmission pin of the USB interface of the processor is correspondingly set with the data transmission pin of the USB interface of the USB device, that is,

The first data transmission pin of the processor USB interface and the first data transmission pin of the USB interface of the USB device are both D+, the second data transmission pin of the processor USB interface and the USB device The second data transfer pin of the USB interface is D-; or

The first data transmission pin of the processor USB interface and the first data transmission pin of the USB interface of the USB device are both D-, the second data transmission pin of the processor USB interface and the USB The second data transmission pin of the USB interface of the device is D+;

The terminal USB interface 20, as shown in FIG. 3, includes five pins, including a first pin, a second pin, a ground pin, a fourth pin, and a fifth pin; To insert, the terminal USB interface adopts a design method corresponding to the USB interface of the USB device, including pin spacing, pin size, etc.; the terminal USB interface is centered on the ground pin, and the other four pins are symmetrically arranged;

As can be seen from the first embodiment, the USB device is centered on the ground pin, and the other four pins are symmetrically arranged. The USB interface pin sequence of the USB device is: a power pin (VBUS) and a first data transfer pin ( D+ or D-), ground pin, second data transfer pin (D- or D+), detection pin (ID);

Therefore, when the USB device is plugged into the terminal USB interface:

The first pin of the terminal USB interface is electrically connected to the power pin of the USB device;

The second pin of the terminal USB interface is electrically connected to the first data transmission pin of the USB device;

The ground pin of the terminal USB interface is electrically connected to the ground pin of the USB device;

The fourth pin of the terminal USB interface is electrically connected to the second data transmission pin of the USB device;

The fifth pin of the terminal USB interface is electrically connected to the detection pin of the USB device.

When the USB device is plugged back into the terminal USB interface:

The first pin of the terminal USB interface is electrically connected to the detecting pin of the USB device;

The second pin of the terminal USB interface is electrically connected to the second data transmission pin of the USB device;

The fourth pin of the terminal USB interface is electrically connected to the first data transmission pin of the USB device;

The fifth pin of the terminal USB interface is electrically connected to the power pin of the USB device.

The pull-up resistor is a first resistor R1, one end is electrically connected to the first power source VDD, and the other end is electrically connected to the fifth pin of the terminal USB interface;

The first resistor R1 is used to divide R1 and R2 or R3 when a USB device is inserted into the terminal. Specifically, as shown in FIG. 4, when the USB device 31 is inserted into the terminal 30, the fifth pin of the terminal USB interface. Electrically connected to the detecting pin of the USB device, the second resistor R2 of the USB device detecting pin is divided with the first resistor R1 of the fifth pin of the terminal USB interface, and the level value of the second resistor R2 is USB. When the device is inserted into the terminal, the level value of the fifth pin of the terminal USB interface is defined as the second level, namely: VDD*R2/(R1+R2);

As shown in FIG. 5, when the USB device 41 is reversely inserted into the terminal 40, the fifth pin of the USB interface of the terminal is electrically connected to the power pin of the USB device, and the third resistor R3 of the USB device power pin is connected to the USB interface of the terminal. The first resistor R1 of the fifth pin is divided, and the level value of the third resistor R3 is the level value of the fifth pin of the terminal USB interface when the USB device is reversely inserted into the terminal, and is defined as the third level. , namely: VDD*R3/(R1+R3);

When no USB device is inserted into the terminal, the fifth pin of the terminal USB interface is pulled up to the first power supply VDD through the first resistor R1 of the pull-up resistor, and the level value of the fifth pin of the terminal USB interface is the first power. Flat, ie: VDD;

In this embodiment, VDD can represent both the first power source and the level value of the first power source; R1, R2, and R3 can represent both the resistance device in the circuit and the resistance value of the resistor.

The comparator 21 includes a first input pin, a second input pin, an output pin, and a ground pin. The first input pin is electrically connected to the fifth pin of the terminal USB interface, and the second The input pin is electrically connected to a reference level, the output pin is electrically connected to the processor; the comparator is for comparing a level of a fifth pin of the terminal USB interface with a reference level, and the terminal is The result of comparing the level of the fifth pin of the USB interface with the reference level is transmitted to the processor; the comparison result may be Logic signals, such as high and low.

The reference level Vc of the comparator, for convenience of explanation, is exemplified by the following definitions of the magnitude relationship of each level value: Vc < first level, that is, VDD; Vc> second level; Vc> third level;

The magnitude relationship shown in the embodiment of the present invention is only one implementation of the embodiment of the present invention, and each parameter value can be appropriately adjusted according to the needs of the circuit.

In this embodiment, VDD can represent both a reference level and a level value of the reference level;

When no USB device is inserted into the terminal, the fifth pin level of the terminal USB interface is at a first level, higher than the reference level of the comparator, so the comparator transmits the first logic signal to the processor as a comparison result; the processor Determining that the switch is operated in an off state according to the first logic signal transmitted by the comparator;

When a USB device is inserted into the terminal, when the fifth pin level of the terminal USB interface is lower than the reference level of the comparator, the comparator transmits a second logic signal to the processor as a comparison result; the processor transmits the second according to the comparator a logic signal, obtaining an ADC converter detecting a level value of a fifth pin of the terminal USB interface;

When the first logic signal is at a high level, the second logic signal is at a low level; when the first logic signal is at a low level, the second logic signal is at a high level; specifically, the setting may be performed according to an actual circuit design.

The processor can identify whether a USB device is plugged into the terminal according to the comparison result transmitted by the comparator, that is, connect the terminal USB interface.

Preferably, when a USB device is inserted, the comparison result of the comparator triggers the processor to acquire the level value of the fifth pin of the terminal USB interface detected by the ADC converter, specifically, the ADC conversion is indicated when the processor receives the trigger. The device detects, or reads the level value of the fifth pin of the terminal USB interface detected by the ADC converter when the processor receives the trigger, which is not limited by the embodiment of the present invention.

The ADC converter 22 is electrically connected to the fifth pin of the terminal USB interface and the processor; for detecting the level value of the fifth pin of the terminal USB interface according to the indication of the processor, and transmitting the detected level value Give the processor;

The ADC converter detects the level value of the fifth pin of the terminal USB interface according to the indication of the processor:

According to the above description, when the USB device is inserted into the terminal, the ADC converter detects that the level value of the fifth pin of the terminal USB interface is the second level;

When the USB device is inserted back into the terminal, the ADC converter detects the fifth of the terminal's USB interface. The level of the pin is the third level;

When a USB device that does not match the terminal is inserted into the terminal, the ADC converter detects that the level of the fifth pin of the terminal USB interface is a level other than the first level, the second level, and the third level. value;

The processor 24 is electrically connected to the comparator, the ADC converter, and the switch; and is configured to indicate the working state of the switch according to the comparison result transmitted by the comparator and the level value of the fifth pin of the terminal USB interface transmitted by the ADC converter. ;

The switch 23 is respectively connected to the terminal USB interface and the processor USB interface, and the switch is connected or disconnected from the USB interface of the processor according to the instruction of the processor. When the terminal USB interface is connected to the USB interface of the processor, the switch performs the power pin, the first data transfer pin, the second data transfer pin, and the detection of the processor according to the instruction of the processor. The pins are respectively connected to the first pin, the second pin, the fourth pin, the fifth pin of the terminal USB interface, or the fifth pin, the fourth pin, the second pin of the terminal USB interface, First pin connection;

The processor receives the second level transmitted by the ADC converter, that is, the level value of the fifth pin of the terminal USB interface, and when the processor determines that the level value transmitted by the ADC converter is the second level, indicating switching The working state of the switch causes the power pin, the first data transmission pin, the second data transmission pin, and the detection pin of the processor USB interface to be respectively connected to the first pin, the second pin, and the fourth tube of the terminal USB interface. The foot and the fifth pin are connected; that is, the pin definition of the USB interface of the terminal is adaptively adjusted according to the forward insertion state of the USB device;

When the processor determines that the level value transmitted by the ADC converter is the third level, indicating that the working state of the switch is such that the power pin of the processor USB interface, the first data transmission pin, the second data transmission pin, The detection pin pins are respectively connected to the fifth pin, the fourth pin, the second pin, and the first pin of the terminal USB interface; that is, the pin definition of the terminal USB interface is inserted backward with the USB device. State to make adaptive adjustments;

When the processor receives the level value transmitted by the ADC converter and the level value other than the first level, the second level, and the third level, the processor thereby instructs the switch to operate in the off state; : disconnecting the terminal USB interface from the USB interface of the processor;

The embodiment of the present invention uses FIG. 3 as an example to illustrate the working principle of the switch, and the switch in the schematic diagram. The expression is only for convenience of description, and is not limited to one switch form in the embodiment. In the embodiment, the switch includes four switching circuits, and each switching circuit includes one S pin and two D pins. As shown in FIG. 3, wherein the S1 to S4 pins of the switch are electrically connected to the power pin, the first data transfer pin, the second data transfer pin, and the detection pin of the processor USB interface; The D1 to D8 pins of the switch are respectively electrically connected to the terminal USB interface pin; the input pin of the switch is connected to the processor, and receives an indication signal of the processor;

As shown in FIG. 3, the D1 pin of the switch is connected to the first pin of the terminal USB interface; the D2 pin of the switch is connected to the fifth pin of the terminal USB interface; the D3 pin of the switch is connected to the terminal of the USB interface Two pins; the D4 pin of the switch is connected to the fourth pin of the terminal USB interface; the D5 pin of the switch is connected to the fourth pin of the terminal USB interface; the D6 pin of the switch is connected to the second tube of the terminal USB interface The D7 pin of the switch is connected to the fifth pin of the terminal USB interface; the D8 pin of the switch is connected to the first pin of the terminal USB interface;

The pin connection relationship of each switching circuit of the switch is described in detail below:

The first switching circuit of the switch includes:

S1 pin, connected to the power pin of the processor;

D1 pin, connected to the first pin of the terminal USB interface;

D2 pin, connected to the fifth pin of the terminal USB interface;

The second switching circuit of the switch includes:

S2 pin, connected to the first data transmission pin of the processor;

D3 pin, connected to the second pin of the terminal USB interface;

D4 pin, connected to the fourth pin of the terminal USB interface;

The third switching circuit of the switch includes:

S3 pin, connected to the second data transmission pin of the processor;

D5 pin, connected to the fourth pin of the terminal USB interface;

D6 pin, connected to the second pin of the terminal USB interface;

The fourth switching circuit of the switch includes:

S4 pin, connected to the detection pin of the processor;

D7 pin, connected to the fifth pin of the terminal USB interface;

D8 pin, connected to the first pin of the terminal USB interface.

When no USB device is inserted into the terminal, the processor instructs the switch to operate in an off state according to the first logic signal transmitted by the comparator; that is, disconnect the USB interface of the terminal from the USB interface of the processor;

The first switching circuit S1 pin is not connected to the D1 and D2 pins;

The second switching circuit S2 pin is not connected to the D3 and D4 pins;

The third circuit switching circuit S3 pin is not connected to the D5 and D6 pins;

The fourth circuit switching circuit S4 pin is not connected to the D7 and D8 pins;

When the USB device is being inserted into the terminal, the processor acquires the level value of the fifth pin of the terminal USB interface detected by the ADC converter according to the second logic signal transmitted by the comparator, and the processor determines the fifth terminal of the USB interface of the terminal. The level value of the pin is a second level, indicating that the working state of the switch is such that the power pin, the first data transfer pin, the second data transfer pin, and the detection pin of the processor USB interface of the processor are respectively The first pin, the second pin, the fourth pin, and the fifth pin of the terminal USB interface are connected; so that the pin definition of the terminal USB interface is adaptively adjusted according to the forward insertion state of the USB device;

The first switching circuit S1 pin is connected to the D1 pin;

The second switching circuit S2 pin is connected to the D3 pin;

The third circuit switching circuit S3 pin is connected to the D5 pin;

The fourth circuit switching circuit S4 pin is connected to the D7 pin;

When the USB device is reversely inserted into the terminal, the processor acquires the level value of the fifth pin of the terminal USB interface detected by the ADC converter according to the second logic signal transmitted by the comparator, and the processor determines the fifth terminal of the USB interface of the terminal. The level of the pin is a third level, indicating that the working state of the switch is such that the power pin, the first data transfer pin, the second data transfer pin, and the detection pin of the processor's USB interface of the processor are respectively The fifth pin, the fourth pin, the second pin, and the first pin of the terminal USB interface are connected; so that the pin definition of the terminal USB interface is adaptively adjusted according to the reverse insertion state of the USB device; which is:

The first switching circuit S1 pin is connected to the D2 pin;

The second switching circuit S2 pin is connected to the D4 pin;

The third circuit switching circuit S3 pin is connected to the D6 pin;

The fourth circuit switching circuit S4 pin is connected to the D8 pin;

When a USB device that does not match the terminal is inserted into the terminal, the processor acquires the level value of the fifth pin of the USB interface of the ADC converter according to the second logic signal transmitted by the comparator, and the terminal USB interface The five-pin level value is a level value other than the first level, the second level, and the third level, and the ADC converter transmits the detected level value to the processor, and the processor instructs the switching The switch operates in an off state; that is, the terminal USB interface is disconnected from the processor USB interface;

The first switching circuit S1 pin is not connected to the D1 and D2 pins;

The second switching circuit S2 pin is not connected to the D3 and D4 pins;

Third embodiment

An embodiment of the present invention provides a workflow applied to the foregoing terminal. As shown in FIG. 6, the method includes:

Step 501: The comparator compares the fifth pin level of the terminal USB interface with a reference level;

Step 502, the comparator determines whether the fifth pin level of the terminal USB interface is higher than the reference level, and if so, step 503 is performed; if not, step 507 is performed;

Step 503: The comparator transmits the first logic signal to the processor.

Step 504: The processor instructs the switch to operate in an off state according to the first logic signal transmitted by the comparator, and ends.

Step 505: The comparator transmits a second logic signal to the processor.

Step 506: The processor acquires, according to the second logic signal transmitted by the comparator, a level value of the fifth pin of the terminal USB interface detected by the ADC converter.

Step 507: The processor determines whether the level value detected by the ADC converter is the second level, if If yes, go to step 508; if no, go to step 509.

Step 508: The processor indicates the working state of the switch, so that the power pin, the first data transfer pin, the second data transfer pin, and the detection pin of the processor are respectively connected to the first pin and the second tube of the terminal USB interface. The foot, the fourth pin, and the fifth pin are connected, and the end is completed;

Step 509, the processor determines whether the level value detected by the ADC converter is the third level, and if so, step 510 is performed; if not, step 511 is performed;

Step 510: The processor indicates the working state of the switch, so that the power pin of the processor, the first data transmission pin, the second data transmission pin, and the detection pin are respectively connected to the fifth pin and the fourth tube of the terminal USB interface. The foot, the second pin, and the first pin are connected, and the end is completed;

Step 511: The processor instructs the switch to operate in an off state and ends.

Compared with the prior art, the embodiments of the present invention provide only one row of USB pins, that is, only one power supply pin, the first data transmission pin, the ground pin, the second data transmission pin, and the detection. The pin greatly improves the user experience by adding a USB connector pin to the mutual recognition of the forward and reverse insertion of the USB device in the prior art, resulting in an increase in the size of the connector and affecting the appearance of the product.

The relationship between the magnitude of the resistance value and the magnitude of the level value given in the embodiment of the present invention is only one implementation of the embodiment of the present invention, and each parameter value can be appropriately adjusted according to the needs of the circuit.

It should also be noted that in the embodiments of the present invention, relational terms such as first, second, third, fourth, fifth, and pin number are used only to refer one entity or operation to another entity. Or the operations are distinct and do not necessarily require or imply any such actual relationship or order between the entities or operations. Furthermore, the term "comprises," "comprises," or "includes" or "includes" or "includes" or "includes" or "includes" or "includes" or "includes" Or include elements inherent to such a process, method, article, or device. The elements defined by the terms "including", "comprising", and <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt;

The serial numbers of the embodiments of the present invention are merely for the description, and do not represent the advantages and disadvantages of the embodiments.

Those skilled in the art can understand that all or part of the steps of implementing the above embodiments can be The completion of the hardware may also be performed by a program to instruct related hardware. The program may be stored in a computer readable storage medium. The storage medium mentioned above may be a read only memory, a magnetic disk or an optical disk.

The specific embodiments described above further explain the beneficial effects of the present invention and the technical solutions. It should be understood that different embodiments may be combined, and the above embodiments are further described. Any combination, modification, equivalent substitution, improvement, etc., made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

A terminal, wherein the terminal comprises a terminal USB interface, a pull-up resistor, a comparator, an ADC converter, a switch, and a processor:

The terminal USB interface is connected to the USB device, and includes five pins, which are: a first pin, a second pin, a ground pin, a fourth pin, and a fifth pin; Center, the other four pins are symmetrically arranged; the processor is provided with a processor USB interface including a power pin, a first data transmission pin, a ground pin, a second data transmission pin, and a detection pin; The ground pin of the terminal USB interface and the ground pin of the USB interface of the processor are grounded;

The pull-up resistor has one end connected to the first power source and the other end electrically connected to the fifth pin of the terminal USB interface;

The comparator includes a first input pin, a second input pin, an output pin, the first input pin is electrically connected to a fifth pin of the terminal USB interface, and the second input pin is a reference level electrical connection, the output pin being electrically coupled to the processor; the comparator for comparing a level of a fifth pin of the terminal USB interface with the reference level and comparing Passing the result to the processor; the level value of the reference level is less than the first power level value;

The ADC converter is electrically connected to a fifth pin of the terminal USB interface and a processor; and is configured to detect a level value of a fifth pin of the USB interface of the terminal;

The switch is respectively connected to the USB interface of the terminal and the USB interface of the processor, and the switch is connected to the USB interface of the terminal according to the instruction of the processor. When the terminal USB interface is connected to the USB interface of the processor, the switch performs a power pin, a first data transfer pin, a second data transfer pin of the processor according to the instruction of the processor, The detecting pin is respectively connected to the first pin, the second pin, the fourth pin, the fifth pin of the terminal USB interface, or the fifth pin, the fourth pin, the second pin of the terminal USB interface , the first pin is connected;

The processor is electrically connected to the comparator, the ADC converter, and the switch; and is configured to indicate the operation of the switch according to the comparison result transmitted by the comparator and the level value of the fifth pin of the terminal USB interface transmitted by the ADC converter status.
The terminal of claim 1 wherein said processor is passed according to a comparator The comparison result indicates the working state of the switch, including:

When the processor receives a comparison result that the fifth terminal level of the terminal USB interface passed by the comparator is higher than the reference level of the comparator, the processor instructs the switch to operate in the off state.
A terminal according to claim 1 or 2, characterized in that

The USB device comprises: a USB interface, comprising: five pins: a power pin, a first data transfer pin, a ground pin, a second data transfer pin, a detection pin; a second resistor, one end and the detecting The pin is electrically connected, and the other end is grounded; the third resistor has one end electrically connected to the power pin and the other end is grounded; the USB device is centered on the ground pin, and the other four pins are symmetrically arranged. The order of the pins of the USB interface is: a power pin, a first data transfer pin, a ground pin, a second data transfer pin, and a detection pin.
The terminal according to claim 3, wherein the processor indicates the operating state of the switch according to the comparison result transmitted by the comparator and the level value of the fifth pin of the terminal USB interface transmitted by the ADC converter, including :

When the processor receives the comparison result of the fifth pin level of the terminal USB interface transmitted by the comparator being lower than the reference level of the comparator, and the processor receives the level of the fifth pin of the terminal USB interface transmitted by the ADC converter When the value is VDD*R2/(R1+R2), the processor instructs the switch to operate in the connected state, so that the power pin, the first data transfer pin, the second data transfer pin, and the detection pin of the processor are respectively The first pin, the second pin, the fourth pin, and the fifth pin of the terminal USB interface are electrically connected, wherein VDD is a level value of the first power source, and R1 is a resistance value of the pull-up resistor. R2 is a resistance value of the second resistor.
The terminal according to claim 3 or 4, wherein the processor indicates the working state of the switch according to the comparison result transmitted by the comparator and the level value of the fifth pin of the terminal USB interface transmitted by the ADC converter. ,include:

When the processor receives the comparison result of the fifth pin level of the terminal USB interface transmitted by the comparator being lower than the reference level of the comparator, and the processor receives the level of the fifth pin of the terminal USB interface transmitted by the ADC converter When the value is VDD*R3/(R1+R3), the processor instructs the switch to operate in the connected state, so that the detection pin, the second data transfer pin, the first data transfer pin, and the power pin of the processor are respectively The first, second, fourth, and fifth pins of the terminal USB interface are electrically connected, wherein VDD is a level value of the first power source, R1 is a resistance value of the pull-up resistor, and R3 is The third resistor The resistance value.
The terminal according to claim 5, wherein the processor indicates the working state of the switch according to the comparison result transmitted by the comparator and the level value of the fifth pin of the terminal USB interface transmitted by the ADC converter, including:

When the processor receives the comparison result of the fifth pin level of the terminal USB interface transmitted by the comparator being lower than the reference level of the comparator, and the processor receives the level of the fifth pin of the terminal USB interface transmitted by the ADC converter When the value is other than VDD*R2/(R1+R2) and VDD*R3/(R1+R3), the processor instructs the switch to operate in the off state.
The terminal according to any one of claims 1 to 6, wherein the pin of the terminal USB interface is a contact type.
A USB device, characterized in that the USB device comprises:

USB interface, comprising five pins: a power pin, a first data transfer pin, a ground pin, a second data transfer pin, and a detection pin;

The USB device is centered on the ground pin, and the other four pins are symmetrically arranged. The USB pin sequence is: a power pin, a first data transfer pin, a ground pin, and a second data transfer pin. , detecting the pin;

a second resistor, one end is electrically connected to the detecting pin, and the other end is grounded;

a third resistor, one end is electrically connected to the power pin, and the other end is grounded;

The resistance of the second resistor and the resistance of the third resistor are not equal.
The USB device of claim 8, wherein the pins of the USB device are contact type.
The USB device of claim 8, wherein the USB device further comprises:

And a processor, connected to the USB interface, for identifying whether the USB device is connected to the terminal USB interface according to the logic level of the detection pin.