CN108009116A

CN108009116A - MicroUSB interface circuits and its mobile terminal

Info

Publication number: CN108009116A
Application number: CN201711401352.8A
Authority: CN
Inventors: 蒋权
Original assignee: Nubia Technology Co Ltd
Current assignee: Nubia Technology Co Ltd
Priority date: 2017-12-22
Filing date: 2017-12-22
Publication date: 2018-05-08
Anticipated expiration: 2037-12-22
Also published as: CN108009116B

Abstract

The present invention discloses a kind of Micro usb circuits and its mobile terminal, belongs to terminal interface field of circuit technology.The Micro usb circuits include：Micro usb interface modules, for realizing that the interaction of USB functions and earphone function interact respectively by Micro USB access ways；Impedance measurement chip, for carrying out impedance monitoring to Micro usb interface modules, when wired headset accesses Micro usb interface modules, to send switch-over control signal；Switching chip, for switching the connection mode between Micro usb interface modules and power management module according to switch-over control signal, selection；Power management chip, for according to the connection mode between Micro usb interface modules and power management module, USB function controls being carried out to Micro usb interface modules or carry out earphone function control to Micro usb interface modules.The Micro usb circuits and its mobile terminal of the present invention, its by Micro USB interfaces can automatic identification USB functions and earphone function, so as to select corresponding operating path, lift user experience.

Description

MicroUSB interface circuits and its mobile terminal

Technical field

The present invention relates to terminal interface field of circuit technology, more particularly to a kind of Micro usb circuits and its movement Terminal.

Background technology

Mobile terminal on the market at present, the overwhelming majority is set using independent USB interface and earphone microphone interface, to lead to respectively USB interface is crossed to realize USB functions (including mobile terminal charge function and data-transformation facility), is realized by earphone microphone interface Earphone function (including the wired input of the audio of mobile terminal and output), but the diminution with mobile terminal size and thickness Reduction, more and more producers start cancel earphone microphone interface, earphone function is realized by using USB Type C interface, so And earphone function is realized by USB Type C interface, it, which is detected, needs special CC monitoring chips so that hardware cost is big Width increase.

The content of the invention

It is a primary object of the present invention to propose a kind of Micro usb circuits and its mobile terminal, it is intended to pass through Micro USB interfaces can automatic identification USB functions and earphone function, so as to select corresponding operating path, lift user Experience.

To achieve the above object, a kind of Micro usb circuits provided by the invention, the Micro USB interfaces electricity Road includes：Micro usb interface modules, for realizing the interaction of USB functions and ear respectively by Micro USB access ways Wheat function interacts；Impedance measurement chip, for carrying out impedance monitoring to the Micro usb interface modules, with wired headset When accessing the Micro usb interface modules, switch-over control signal is sent；Switching chip, for being controlled according to the switching Signal processed, selection switch the connection mode between the Micro usb interface modules and the power management module；Power management Chip, for according to the connection mode between the Micro usb interface modules and the power management module, to described Micro usb interface modules carry out USB function controls or carry out earphone function control to the Micro usb interface modules.

Alternatively, the power management chip includes：USB function control units, for the Micro USB interfaces mould Block carries out USB function controls；Earphone function control unit, for carrying out earphone function control to the Micro usb interface modules System.

Alternatively, the switching chip includes switching signal receiving unit, the first pin units, second pin unit And the 3rd pin units, first pin units, which correspond to, connects the Micro usb interface modules, the second pin list Member is corresponding to connect the USB function control units, and the 3rd pin units, which correspond to, connects the earphone function control unit, institute State the first pin units and switch the connection second pin unit or described the under the control of the switching signal receiving unit Three pin units.

Alternatively, the impedance measurement chip includes：Enabled pin units, for monitoring the Micro USB interfaces mould The level signal of the ID pins of block, is worked with judging whether to start the impedance measurement chip；Input pin unit, is used for Connect the DP pins of the Micro usb interface modules and DM pins respectively, with monitor the DP pins and the DM pins it Between impedance variations；Measurement result output unit, for according to the resistance between the DP pins and the DM pins monitored Resistance, exports switch-over control signal.

Alternatively, the power management chip further includes：Voltage output unit, for exporting the Micro USB interfaces The operating voltage of circuit；Headset plugs detection unit, for the switch-over control signal sent according to the impedance measurement chip, sentences Whether the Micro usb interface modules that break access wired headset, and the switch-over control signal is transmitted to the switch and is cut Change chip.

In addition, the present invention also proposes a kind of mobile terminal, the mobile terminal include terminal handler and with the terminal The Micro usb circuits of processor connection, the Micro usb circuits include：Micro usb interface modules, are used In by Micro USB access ways come realize respectively USB functions interaction and earphone function interact；Impedance measurement chip, is used In carrying out impedance monitoring to the Micro usb interface modules, to access the Micro usb interface modules in wired headset When, send switch-over control signal；Switching chip, for switching the Micro according to the switch-over control signal, selection Connection mode between usb interface module and the power management module；Power management chip, for according to the Micro Connection mode between usb interface module and the power management module, USB work(is carried out to the Micro usb interface modules It can control or earphone function control is carried out to the Micro usb interface modules.

Micro usb circuits and its mobile terminal proposed by the present invention, its Micro usb circuit include Micro usb interface modules, impedance measurement chip, switching chip and power management chip, during work, pass through its impedance Chip is measured, impedance monitoring is carried out to its Micro usb interface module, to access its Micro USB interface mould in wired headset During block, switch-over control signal is sent, then by its switching chip under the switch-over control signal, to Micro USB interfaces Connection mode between module and power management module makes choice switching.Come finally by its power management chip according to switching Connection mode between the Micro usb interface modules and power management module chosen, carries out Micro usb interface modules USB function controls carry out earphone function control to Micro usb interface modules.As it can be seen that the Micro USB interfaces electricity of the present invention Road and its mobile terminal, its by Micro USB interfaces can automatic identification USB functions and earphone function, so as to select pair The operating path answered, lifts user experience.

Brief description of the drawings

Fig. 1 is the hardware architecture diagram for the mobile terminal for realizing each embodiment of the present invention.

Fig. 2 is the communications network system Organization Chart that mobile terminal as shown in Figure 1 is based on.

Fig. 3 is the circuit diagram for the Micro usb circuits that the embodiment of the present invention one provides.

Fig. 4 is the shutdown charging flow schematic diagram of Micro usb circuits shown in Fig. 3.

Fig. 5 is the start charging flow schematic diagram of Micro usb circuits shown in Fig. 3.

Fig. 6 is that the wired headset of Micro usb circuits shown in Fig. 3 is inserted into flow diagram.

Fig. 7 is that the wired headset of Micro usb circuits shown in Fig. 3 extracts flow diagram.

Fig. 8 is that the OTG equipment of Micro usb circuits shown in Fig. 3 is inserted into flow diagram.

Fig. 9 is that the OTG equipment of Micro usb circuits shown in Fig. 3 extracts journey schematic diagram.

Figure 10 is the structure diagram of mobile terminal provided by Embodiment 2 of the present invention.

The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.

Embodiment

It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.

In follow-up description, the suffix using such as " module ", " component " or " unit " for representing element is only Be conducive to the explanation of the present invention, itself there is no a specific meaning.Therefore, " module ", " component " or " unit " can mix Ground uses.

Terminal can be implemented in a variety of manners.For example, terminal described in the present invention can include such as mobile phone, tablet electricity Brain, laptop, palm PC, personal digital assistant (Personal Digital Assistant, PDA), portable matchmaker Body player (Portable Media Player, PMP), guider, wearable device, Intelligent bracelet, pedometer etc. are mobile Terminal, and the fixed terminal such as numeral TV, desktop computer.

It will be illustrated in subsequent descriptions by taking mobile terminal as an example, it will be appreciated by those skilled in the art that except special Outside element for moving purpose, construction according to the embodiment of the present invention can also apply to the terminal of fixed type.

Referring to Fig. 1, its hardware architecture diagram for a kind of mobile terminal of each embodiment of the realization present invention, the shifting Dynamic terminal 100 can include：RF (Radio Frequency, radio frequency) unit 101, WiFi module 102, audio output unit 103rd, A/V (audio/video) input unit 104, sensor 105, display unit 106, user input unit 107, interface unit 108th, the component such as memory 109, processor 110 and power supply 111.It will be understood by those skilled in the art that shown in Fig. 1 Mobile terminal structure does not form the restriction to mobile terminal, and mobile terminal can be included than illustrating more or fewer components, Either combine some components or different components arrangement.

The all parts of mobile terminal are specifically introduced with reference to Fig. 1：

Radio frequency unit 101 can be used for receiving and sending messages or communication process in, the reception and transmission of signal, specifically, by base station Downlink information receive after, handled to processor 110；In addition, by the data sending of uplink to base station.In general, radio frequency unit 101 Including but not limited to antenna, at least one amplifier, transceiver, coupler, low-noise amplifier, duplexer etc..In addition, penetrate Frequency unit 101 can also be communicated by wireless communication with network and other equipment.Above-mentioned wireless communication can use any communication Standard or agreement, include but not limited to GSM (Global System of Mobile communication, global system for mobile telecommunications System), GPRS (General Packet Radio Service, general packet radio service), CDMA2000 (Code Division Multiple Access 2000, CDMA 2000), WCDMA (Wideband Code Division Multiple Access, wideband code division multiple access), TD-SCDMA (Time

Division-Synchronous Code Division Multiple Access, TD SDMA), FDD-LTE (Frequency Division Duplexing-Long Term Evolution, frequency division duplex Long Term Evolution) and TDD-LTE (Time Division Duplexing-Long Term Evolution, time division duplex Long Term Evolution) etc..

WiFi belongs to short range wireless transmission technology, and mobile terminal can help user to receive and dispatch electricity by WiFi module 102 Sub- mail, browse webpage and access streaming video etc., it has provided wireless broadband internet to the user and has accessed.Although Fig. 1 shows Go out WiFi module 102, but it is understood that, it is simultaneously not belonging to must be configured into for mobile terminal, completely can be according to need To be omitted in the essential scope for do not change invention.

Audio output unit 103 can be in call signal reception pattern, call mode, record mould in mobile terminal 100 Formula, speech recognition mode, broadcast reception mode when under isotype, by radio frequency unit 101 or WiFi module 102 it is receiving or It is sound that the voice data stored in memory 109, which is converted into audio signal and exports,.Moreover, audio output unit 103 The relevant audio output of specific function performed with mobile terminal 100 can also be provided (for example, call signal receives sound, disappears Breath receives sound etc.).Audio output unit 103 can include loudspeaker, buzzer etc..

A/V input units 104 are used to receive audio or video signal.A/V input units 104 can include graphics processor (Graphics Processing Unit, GPU) 1041 and microphone 1042, graphics processor 1041 is in video acquisition mode Or the static images or the view data of video obtained in image capture mode by image capture apparatus (such as camera) carry out Reason.Picture frame after processing may be displayed on display unit 106.Picture frame after the processing of graphics processor 1041 can be deposited Storage is transmitted in memory 109 (or other storage mediums) or via radio frequency unit 101 or WiFi module 102.Mike Wind 1042 can connect in telephone calling model, logging mode, speech recognition mode etc. operational mode via microphone 1042 Quiet down sound (voice data), and can be voice data by such acoustic processing.Audio (voice) data after processing can To be converted to the form output that mobile communication base station can be sent to via radio frequency unit 101 in the case of telephone calling model. Microphone 1042 can implement various types of noises and eliminate (or suppression) algorithm to eliminate (or suppression) in reception and send sound The noise produced during frequency signal or interference.

Mobile terminal 100 further includes at least one sensor 105, such as optical sensor, motion sensor and other biographies Sensor.Specifically, optical sensor includes ambient light sensor and proximity sensor, wherein, ambient light sensor can be according to environment The light and shade of light adjusts the brightness of display panel 1061, and proximity sensor can close when mobile terminal 100 is moved in one's ear Display panel 1061 and/or backlight.As one kind of motion sensor, accelerometer sensor can detect in all directions (general For three axis) size of acceleration, size and the direction of gravity are can detect that when static, the application available for identification mobile phone posture (such as horizontal/vertical screen switching, dependent game, magnetometer pose calibrating), Vibration identification correlation function (such as pedometer, percussion) etc.； The fingerprint sensor that can also configure as mobile phone, pressure sensor, iris sensor, molecule sensor, gyroscope, barometer, The other sensors such as hygrometer, thermometer, infrared ray sensor, details are not described herein.

Display unit 106 is used for the information for showing by information input by user or being supplied to user.Display unit 106 can wrap Display panel 1061 is included, liquid crystal display (Liquid Crystal Display, LCD), Organic Light Emitting Diode can be used Forms such as (Organic Light-Emitting Diode, OLED) configures display panel 1061.

User input unit 107 can be used for the numeral or character information for receiving input, and produce the use with mobile terminal The key signals input that family is set and function control is related.Specifically, user input unit 107 may include contact panel 1071 with And other input equipments 1072.Contact panel 1071, also referred to as touch-screen, collect user on it or neighbouring touch operation (for example user uses any suitable objects or annex such as finger, stylus on contact panel 1071 or in contact panel 1071 Neighbouring operation), and corresponding attachment device is driven according to formula set in advance.Contact panel 1071 may include touch detection Two parts of device and touch controller.Wherein, the touch orientation of touch detecting apparatus detection user, and detect touch operation band The signal come, transmits a signal to touch controller；Touch controller receives touch information from touch detecting apparatus, and by it Contact coordinate is converted into, then gives processor 110, and the order that processor 110 is sent can be received and performed.In addition, can To realize contact panel 1071 using polytypes such as resistance-type, condenser type, infrared ray and surface acoustic waves.Except contact panel 1071, user input unit 107 can also include other input equipments 1072.Specifically, other input equipments 1072 can wrap Include but be not limited to physical keyboard, in function key (such as volume control button, switch key etc.), trace ball, mouse, operation lever etc. One or more, do not limit herein specifically.

Further, contact panel 1071 can cover display panel 1061, when contact panel 1071 detect on it or After neighbouring touch operation, processor 110 is sent to determine the type of touch event, is followed by subsequent processing device 110 according to touch thing The type of part provides corresponding visual output on display panel 1061.Although in Fig. 1, contact panel 1071 and display panel 1061 be the component independent as two to realize the function that outputs and inputs of mobile terminal, but in certain embodiments, can The function that outputs and inputs of mobile terminal is realized so that contact panel 1071 and display panel 1061 is integrated, is not done herein specifically Limit.

Interface unit 108 is connected the interface that can pass through as at least one external device (ED) with mobile terminal 100.For example, External device (ED) can include wired or wireless head-band headset port, external power supply (or battery charger) port, wired or nothing Line data port, memory card port, the port for connecting the device with identification module, audio input/output (I/O) end Mouth, video i/o port, headset port etc..Interface unit 108 can be used for receiving the input from external device (ED) (for example, number It is believed that breath, electric power etc.) and the input received is transferred to one or more elements in mobile terminal 100 or can be with For transmitting data between mobile terminal 100 and external device (ED).

Memory 109 can be used for storage software program and various data.Memory 109 can mainly include storing program area And storage data field, wherein, storing program area can storage program area, application program (such as the sound needed at least one function Sound playing function, image player function etc.) etc.；Storage data field can store according to mobile phone use created data (such as Voice data, phone directory etc.) etc..In addition, memory 109 can include high-speed random access memory, can also include non-easy The property lost memory, a for example, at least disk memory, flush memory device or other volatile solid-state parts.

Processor 110 is the control centre of mobile terminal, utilizes each of various interfaces and the whole mobile terminal of connection A part, by running or performing the software program and/or module that are stored in memory 109, and calls and is stored in storage Data in device 109, perform the various functions and processing data of mobile terminal, so as to carry out integral monitoring to mobile terminal.Place Reason device 110 may include one or more processing units；Preferably, processor 110 can integrate application processor and modulatedemodulate is mediated Device is managed, wherein, application processor mainly handles operating system, user interface and application program etc., and modem processor is main Handle wireless communication.It is understood that above-mentioned modem processor can not also be integrated into processor 110.

Mobile terminal 100 can also include the power supply 111 (such as battery) to all parts power supply, it is preferred that power supply 111 Can be logically contiguous by power-supply management system and processor 110, so as to realize management charging by power-supply management system, put The function such as electricity and power managed.

Although Fig. 1 is not shown, mobile terminal 100 can also be including bluetooth module etc., and details are not described herein.

For the ease of understanding the embodiment of the present invention, below to the communications network system that is based on of mobile terminal of the present invention into Row description.

Referring to Fig. 2, Fig. 2 is a kind of communications network system Organization Chart provided in an embodiment of the present invention, the communication network system Unite includes UE (User Equipment, the use for communicating connection successively for the LTE system of universal mobile communications technology, the LTE system Family equipment) 201, E-UTRAN (Evolved UMTS Terrestrial RadioAccess Network, evolved UMTS lands Ground wireless access network) 202, EPC (Evolved Packet Core, evolved packet-based core networks) 203 and operator IP operation 204。

Specifically, UE201 can be above-mentioned terminal 100, and details are not described herein again.

E-UTRAN202 includes eNodeB2021 and other eNodeB2022 etc..Wherein, eNodeB2021 can be by returning Journey (backhaul) (such as X2 interface) is connected with other eNodeB2022, and eNodeB2021 is connected to EPC203, ENodeB2021 can provide the access of UE201 to EPC203.

EPC203 can include MME (Mobility Management Entity, mobility management entity) 2031, HSS (Home Subscriber Server, home subscriber server) 2032, other MME2033, SGW (Serving Gate Way, Gateway) 2034, PGW (PDN Gate Way, grouped data network gateway) 2035 and PCRF (Policy and Charging Rules Function, policy and rate functional entity) 2036 etc..Wherein, MME2031 be processing UE201 and The control node of signaling between EPC203, there is provided carrying and connection management.HSS2032 is all to manage for providing some registers Such as the function of attaching position register (not shown) etc, and preserve some and used in relation to service features, data rate etc. The dedicated information in family.All customer data can be transmitted by SGW2034, and PGW2035 can provide the IP of UE 201 Address is distributed and other functions, and PCRF2036 is strategy and the charging control strategic decision-making of business data flow and IP bearing resources Point, it selects and provides available strategy and charging control decision-making with charge execution function unit (not shown) for strategy.

IP operation 204 can include internet, Intranet, IMS (IP Multimedia Subsystem, IP multimedia System) or other IP operations etc..

Although above-mentioned be described by taking LTE system as an example, those skilled in the art it is to be understood that the present invention not only Suitable for LTE system, other wireless communication systems are readily applicable to, such as GSM,

CDMA2000, WCDMA, TD-SCDMA and following new network system etc., do not limit herein.

Based on above-mentioned mobile terminal hardware configuration and communications network system, each embodiment of the method for the present invention is proposed.

Embodiment one

As shown in figure 3, the embodiment of the present invention one proposes a kind of Micro usb circuits 300, the Micro USB interfaces Circuit 300 includes Micro usb interface modules 310, impedance measurement chip 320, switching chip 330 and power management core Piece 340.

Wherein, Micro usb interface modules 310 are mainly used for realizing USB work(respectively by Micro USB access ways Can interaction and earphone function interaction.Specifically, as shown in figure 3, Micro usb interface modules 310 include ID (dead end) pin, VBUS (the positive 5V of power supply) pin, GND (signal ground) pin, DP (data cable is just) pins and DM (data cable is born) pin.In reality During the use of border, the equipment such as data cable, charging wire, OTG equipment and wired headset is by Micro USB access ways with being somebody's turn to do Micro usb interface modules 310, to realize that (including the charging and data-transformation facility) interaction of USB functions and earphone function are handed over Mutually.

Impedance measurement chip 320 is mainly used for carrying out impedance monitoring to Micro usb interface modules 310, with wired ear When wheat accesses Micro usb interface modules 310, switch-over control signal is sent.Specifically, as shown in figure 3, impedance measurement chip bag Enabled pin units 321, input pin unit 322 and measurement result output unit 323 are included, wherein, enable pin units 321 Including EN pins, which is connected with the ID pins of Micro usb interface modules 310, to enable pin units 321 by this Monitor the level signal of the ID pins of Micro usb interface modules 310, thus judge whether to start impedance measurement chip 320 into Row work (in the present embodiment, when the ID pins of Micro usb interface modules 310 are changed into low level signal, the enabled pin list Member 321 starts impedance measurement chip 320 and works).Input pin unit 322 includes R_P pins and R_M pins, wherein, R_ The DP pins of P pins connection Micro usb interface modules 310, the DM of R_M pins connection Micro usb interface modules 310 draw Foot, to be become by the input pin unit 322 to the impedance between the DP pins and DM pins of Micro usb interface modules 310 Change is monitored.Measurement result output unit 323 includes INT (output is interrupted) pin, which is used for According to the impedance variations between the DP pins and DM pins of the Micro usb interface modules 310 monitored, output switching control letter Number.

Power management chip 340 is mainly used for according between Micro usb interface modules 310 and power management module 340 Connection mode, Micro usb interface modules 310 USB function controls or Micro usb interface modules 310 are carried out Earphone function controls.Specifically, power management chip 340 includes USB function control units 341, earphone function control unit 342nd, voltage output unit 343 and headset plug detection unit 344, wherein, USB function control units 341 include VBUS (electricity The positive 5V in source) pin, GND (signal ground) pin, DP (data cable is just) pins and DM (data cable is born) pin, with Micro When usb interface module 310 is connected with the USB function control units 341, by the USB function control units 341 to Micro Usb interface module 310 carries out USB function controls.Earphone function control unit 342 include Mic_in (headset input) pin, HPH_REF (reference ground) pin, HS_L (the left output of headset) pins and HS_R (the right output of headset) pin, with Micro When usb interface module 310 is connected with the earphone function control unit 342, by the earphone function control unit 342 to Micro Usb interface module 310 carries out earphone function control.Voltage output unit 343 is mainly used for exporting Micro usb circuits 300 operating voltage.In the designing scheme of the present embodiment, which mainly includes LX_1V8 pins, can be used for Export the operating voltage of 1.8V.Headset plug detection unit 344 includes HS_DET pins, can be sent according to impedance measurement chip Switch-over control signal, judges whether Micro usb interface modules 310 access wired headset, and switch-over control signal is transmitted to Switching chip 330.In addition, power management chip 340 further includes USB_ID pins, to correspond to Micro usb interface modules 310 ID pins, carry out master-slave equipment identification.

Switching chip 330 is mainly used for according to switch-over control signal, selection switching Micro usb interface modules 310 With the connection mode between power management module 340.Specifically, switching chip 330 includes switching signal receiving unit 331st, the first pin units 332,333 and the 3rd pin units 334 of second pin unit.First pin units 332, which correspond to, to be connected Connect Micro usb interface modules 310, i.e. the DA1 pins of the first pin units 332, DA2 pins, DA3 pins and DA4 pins It is sequentially connected VBUS pins, GND pin, DP pins and the DM pins of Micro usb interface modules 310.Second pin unit 333 correspond to connection USB function control units 341, i.e., the DB1 pins of second pin unit 333, DB2 pins, DB3 pins and DB4 pins are sequentially connected VBUS pins, GND pin, DP pins and the DM pins of USB function control units 341.3rd pin Unit 334 corresponds to connection headset function control unit 342, i.e. the DC1 pins of the 3rd pin units 334, DC2 pins, DC3 pins And DC4 pins be sequentially connected the Mic_in pins of earphone function control unit 342, HPH_REF pins, HS_L pins and HS_R pins.Switching signal receiving unit 341 includes SEL pins, the SEL pins and the HS_ of headset plug detection unit 344 DET pins connect, to receive the switch-over control signal that it is forwarded.So, the first pin units 332 can be believed in switching Switching connection second pin unit 333 or the 3rd pin units 334 under the control of number receiving unit 331 so that Micro USB connect Mouth mold block 310 or the USB function control units 341 for connecting power management chip 340, or the ear of connection power management chip 340 Wheat function control unit 342.

In the designing scheme of the present embodiment, as shown in figure 3, the HS_DET pins of power management chip 340 are connected to two The anode of pole pipe D1, D2, the USB_ID pins of power management chip 340 are connected to the anode of diode D3, D4.Micro USB The ID pins of interface module 310 are pulled to the LX_1V8 pins of power management chip 340, while Micro by pull-up resistor R1 The ID pins of usb interface module 310 are connected to the cathode of diode D2, D4 and the EN pins of impedance measurement chip 320, impedance The INT pins of measurement chip 320 are connected to the grid of diode D1 cathodes and NMOS tube Q1, and the drain electrode of NMOS tube Q1 passes through upper Pull-up resistor R3 is connected to the LX_1V8 pins of power management chip 340 and is connected to the cathode of diode D3, NMOS tube Q1's Source electrode is connected to mainboard GND signals.In type selecting, R1, R2 in the present embodiment can select 10K resistance, switching chip 330 Supply voltage be typically 1.8V, cut-in voltage Vgs (th) scope of NMOS tube Q1 is 0.5V~1.0V, diode D1, D2, The pressure drop of D3, D4 are less than 0.1V.

Below in conjunction with attached drawing, to specific work of the Micro usb circuits 300 in the present embodiment under various operating modes It is explained in detail as principle.

First, shutdown charging work principle.

When the detection of corresponding mobile terminal is in off-mode, at this time, if Micro usb interface modules 310 pass through When Micro USB access ways are connected to charger insertion, charger exports the corresponding mobile terminal of Vbus voltage triggereds most Mini system starts, and power management chip 340 powers on, its LX_1V8 pin output 1.8V voltages, switching chip 330 works. At this time, the ID pins (being pulled to LX_1V8 pins by R1 resistance) of Micro usb interface modules 310 are high level so that two Pole pipe D2 is turned on, so that the HS_DET pins of power management chip 340 are high level, the SEL of switching chip 330 draws Foot is also high level, and at this time, DA1 pins, DA2 pins, DA3 pins, the DA4 pins of switching chip 330 connect respectively successively DB1 pins, DB2 pins, DB3 pins, the DB4 pins of switching chip 330 are connect, so that Micro usb interface modules 310 VBUS pins, GND pin, DP pins, DM pins are corresponding in turn to VBUS pins, the GND of connection power management chip 340 Pin, DP pins, DM pins.So, after mobile terminal minimum system gets up, charge protocol communication, communication are carried out Charge after end according to communication protocol content Current Voltage, whole workflow schematic diagram is as shown in Figure 4.

2nd, start charging work principle.

When the detection of corresponding mobile terminal is in open state, the ID pins of Micro usb interface modules 310 (pass through R1 resistance is pulled to LX_1V8 pins) it is high level so that and diode D2, D4 are turned on, and the HS_DET of power management chip 340 draws Foot, USB_ID pins are high level, because the HS_DET pins of power management chip 340 are high level, therefore switching chip 330 SEL pins are also high level, and DA1 pins, DA2 pins, DA3 pins, the DA4 pins of switching chip 330 divide successively DB1 pins, DB2 pins, DB3 pins, the DB4 pins of other connecting valve switching chip 330.Therefore, this state is default conditions. When Micro usb interface modules 310 are connected to charger by Micro USB access ways to be inserted into, Micro USB interface moulds The ID pins (being still pulled to LX_1V8 pins by R1 resistance) of block 310 are high level, and diode D2, D4 are still turned on, electricity HS_DET pins, the USB_ID pins of source control chip 340 be also high level (at this time, corresponding mobile terminal be identified as from Equipment), therefore the SEL pins of switching chip 330 are still high level, so switching chip 330 still maintains existing DA1 pins, DA2 pins, DA3 pins, the DA4 pins of Default Connected State, i.e. switching chip 330 successively open respectively by connection Concern changes DB1 pins, DB2 pins, DB3 pins, the DB4 pins of chip 330 so that the VBUS of Micro usb interface modules 310 VBUS pins, GND pin, the DP that pin, GND pin, DP pins, DM pins are corresponding in turn to connection power management chip 340 draw Foot, DM pins.So, while mobile terminal is connected to charger insertion, charger carries out charging association with mobile terminal View communication, sign off charge according to communication protocol content Current Voltage afterwards, and whole workflow schematic diagram is as shown in Figure 5.

3rd, wired headset insertion operation principle.

When the detection of corresponding mobile terminal is in open state, the ID pins of Micro usb interface modules 310 (pass through R1 resistance is pulled to LX_1V8 pins) it is high level so that and diode D2, D4 are turned on, and the HS_DET of power management chip 340 draws Foot, USB_ID pins are high level, because the HS_DET pins of power management chip 340 are high level, therefore switching chip 330 SEL pins are also high level, and DA1 pins, DA2 pins, DA3 pins, the DA4 pins of switching chip 330 divide successively DB1 pins, DB2 pins, DB3 pins, the DB4 pins of other connecting valve switching chip 330.Therefore, this state is default conditions.

When Micro usb interface modules 310 are connected to wired headset by Micro USB access ways to be inserted into, Micro VBUS pins, GND pin, DP pins, DM pins, the ID pins of usb interface module 310 are corresponding in turn to and are connected to wired headset MIC pins, GND pin, HS_L pins, HS_R pins, HS_DET pins.Therefore, when Micro usb interface modules 310 are inserted into During wired headset, the HS_DET pins of wired headset are connected to HS_L pins, and the HS_L pins in wired headset pass through 8 Europe Loudspeaker are connected to GND pin, so, the 8 Europe loudspeaker that the ID pins of Micro usb interface modules 310 pass through HS_L pins at this time It is pulled down to GND signals, diode D2, D4 cut-off conducting.When the ID pins of Micro usb interface modules 310 are changed into low level When, the EN pin input low levels of impedance measurement chip 320, impedance measurement chip 320 is started to work, and measurement Micro USB connect Impedance between the DP pins and DM pins of mouth mold block 310 is less than 150R, the INT pins of measurement Micro usb interface modules 310 Export as low level, diode D1 cut-off conductings, NMOS tube Q1 shut-offs, diode D3, which is pulled up resistance R3 and is pulled to LX_1V8, to be drawn Foot, therefore diode D3 is turned on, USB_ID pins still remain high (at this time, corresponding mobile terminal is identified as slave device).And Since diode D1, D2 are turned off turning on, therefore HS_DET pins are pulled down resistance R2 and stretch low level, so, switching core The signal of the SEL pins of piece 330 is changed into low level, at this time, the DA1 pins of switching chip 330, DA2 pins, DA3 pins, DA4 pins switch connection mode, with distinguish successively the connecting valve switching DC1 pins of chip 330, DC2 pins, DC3 pins, DC4 pins so that VBUS pins, GND pin, DP pins, the DM pins of Micro usb interface modules 310 are corresponding in turn to connection Mic_in pins, HPH_REF pins, HS_L pins and the HS_R pins of power management chip 340, so that wired headset MIC pins, GND pin, HS_L pins, HS_R be corresponding in turn to Mic_in pins, the HPH_ of connection power management chip 340 REF pins, HS_L pins and HS_R pins.When the HS_DET leg signals of power management chip 340 are by high level to low electricity During flat change, corresponding mobile terminal enters normal headset identification process, and whole workflow schematic diagram is as shown in Figure 6.

And when wired headset is pulled out, the ID pins of Micro usb interface modules 310 (are pulled to LX_ by R1 resistance 1V8 pins) it is high level, diode D2, D4 conducting, HS_DET pins, the USB_ID pins of power management chip 340 are height Level, therefore the SEL leg signals of switching chip 330 are changed by low level to high level, the DA1 of switching chip 330 Pin, DA2 pins, DA3 pins, DA4 pins distinguish DB1 pins, DB2 pins, the DB3 of connecting valve switching chip 330 successively Pin, DB4 pins, recover Default Connected State.Meanwhile the HS_DET leg signals of power management chip 340 by low level to High level changes, and corresponding mobile terminal execution headset transfers to flow, and whole workflow schematic diagram is as shown in Figure 7.

4th, OTG equipment insertion operation principle.

When Micro usb interface modules 310 are connected to OTG equipment by Micro USB access ways to be inserted into, Micro The ID pins of usb interface module 310 are pulled down to GND signals, diode D2, D4 cut-off conducting.When Micro usb interface modules When 310 ID pins are changed into low level, the EN pin input low levels of impedance measurement chip 320, impedance measurement chip 320 starts Work, the impedance between the DP pins and DM pins of measurement Micro usb interface modules 310 are more than 150R, measurement Micro USB The INT pins output of interface module 310 is high level, and diode D1 conductings, NMOS tube Q1 is turned on, therefore diode D3 cut-offs are led Logical, USB_ID pins are converted to low level (at this time, corresponding mobile terminal is identified as main equipment).And diode D1 conductings, D2 Cut-off conducting, therefore HS_DET pins still remain high level, therefore the SEL pins of switching chip 330 are still high level, So switching chip 330 still maintains existing Default Connected State, i.e. DA1 pins, the DA2 of switching chip 330 draw DB1 pins, DB2 pins, DB3 pins, the DB4 of connecting valve switching chip 330 draw respectively successively for foot, DA3 pins, DA4 pins Foot so that VBUS pins, GND pin, DP pins, the DM pins of Micro usb interface modules 310 are corresponding in turn to connection power supply pipe Manage VBUS pins, GND pin, DP pins, the DM pins of chip 340.When power management chip 340 USB_ID leg signals by High level to low level change when, corresponding mobile terminal enters OTG patterns, and whole workflow schematic diagram is as shown in Figure 8.

And when OTG equipment is pulled out, the ID pins of Micro usb interface modules 310 (are pulled to LX_ by R1 resistance 1V8 pins) it is high level, diode D2, D4 conducting, HS_DET pins, the USB_ID pins of power management chip 340 are height Level.Meanwhile the USB_ID leg signals of power management chip 340 are changed by low level to high level, corresponding mobile terminal OTG patterns are exited, whole workflow schematic diagram is as shown in Figure 9.

Embodiment two

As shown in Figure 10, the embodiment of the present invention two proposes a kind of mobile terminal 400, which includes terminal Reason device (not shown) and the Micro usb circuits 300 being connected with terminal handler, the Micro usb circuits 300 wrap Include Micro usb interface modules 310, impedance measurement chip 320, switching chip 330 and power management chip 340.

First, shutdown charging work principle.

2nd, start charging work principle.

3rd, wired headset insertion operation principle.

4th, OTG equipment insertion operation principle.

The Micro usb circuits and its mobile terminal that the embodiment of the present invention proposes, its Micro usb circuit bag Include Micro usb interface modules, impedance measurement chip, switching chip and power management chip, during work, pass through its resistance Anti- measurement chip, carries out impedance monitoring, to access its Micro USB interface in wired headset to its Micro usb interface module During module, switch-over control signal is sent, then Micro USB are connect under the switch-over control signal by its switching chip Connection mode between mouth mold block and power management module makes choice switching.Carry out basis finally by its power management chip to cut Change the connection mode between the Micro usb interface modules and power management module chosen, to Micro usb interface modules into Row USB function controls carry out earphone function control to Micro usb interface modules.As it can be seen that the Micro USB interfaces of the present invention Circuit and its mobile terminal, its by Micro USB interfaces can automatic identification USB functions and earphone function, so as to select Corresponding operating path, lifts user experience.

It should be noted that herein, term " comprising ", "comprising" or its any other variant are intended to non-row His property includes, so that process, method, article or device including a series of elements not only include those key elements, and And other elements that are not explicitly listed are further included, or further include as this process, method, article or device institute inherently Key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that including this Also there are other identical element in the process of key element, method, article or device.

The embodiments of the present invention are for illustration only, do not represent the quality of embodiment.

Through the above description of the embodiments, those skilled in the art can be understood that above-described embodiment side Method can add the mode of required general hardware platform to realize by software, naturally it is also possible to by hardware, but in many cases The former is more preferably embodiment.Based on such understanding, technical scheme substantially in other words does the prior art Going out the part of contribution can be embodied in the form of software product, which is stored in a storage medium In (such as ROM/RAM, magnetic disc, CD), including some instructions are used so that a station terminal equipment (can be mobile phone, computer, takes Be engaged in device, air conditioner, or network equipment etc.) perform method described in each embodiment of the present invention.

It these are only the preferred embodiment of the present invention, be not intended to limit the scope of the invention, it is every to utilize this hair The equivalent structure or equivalent flow shift that bright specification and accompanying drawing content are made, is directly or indirectly used in other relevant skills Art field, is included within the scope of the present invention.

Claims

1. a kind of Micro usb circuits, it is characterised in that the Micro usb circuits include：

Micro usb interface modules, for realizing the interaction of USB functions and headset respectively by Micro USB access ways Function interacts；

Impedance measurement chip, for carrying out impedance monitoring to the Micro usb interface modules, described in being accessed in wired headset During Micro usb interface modules, switch-over control signal is sent；

Switching chip, for according to the switch-over control signal, selection switch the Micro usb interface modules with it is described Connection mode between power management module；

Power management chip, for according to the connection side between the Micro usb interface modules and the power management module Formula, carries out the Micro usb interface modules USB function controls or carries out headset work(to the Micro usb interface modules Can control.

2. Micro usb circuits as claimed in claim 1, it is characterised in that the power management chip includes：

USB function control units, for carrying out USB function controls to the Micro usb interface modules；

Earphone function control unit, for carrying out earphone function control to the Micro usb interface modules.

3. Micro usb circuits as claimed in claim 2, it is characterised in that the switching chip includes switching Signal receiving unit, the first pin units, second pin unit and the 3rd pin units, first pin units, which correspond to, to be connected The Micro usb interface modules are connect, the second pin unit, which corresponds to, connects the USB function control units, and the described 3rd Pin units, which correspond to, connects the earphone function control unit, and first pin units are in the switching signal receiving unit The lower switching of control connects the second pin unit or the 3rd pin units.

4. the Micro usb circuits as described in claim 1-3 is any, it is characterised in that the impedance measurement chip bag Include：

Enabled pin units, the level signal of the ID pins for monitoring the Micro usb interface modules, to judge whether to open The impedance measurement chip is moved to work；

Input pin unit, for connecting the DP pins and DM pins of the Micro usb interface modules respectively, with described in monitoring Impedance variations between DP pins and the DM pins；

Measurement result output unit, the impedance variations between the DP pins and the DM pins that are monitored for basis are defeated Go out switch-over control signal.

5. Micro usb circuits as claimed in claim 4, it is characterised in that the power management chip further includes：

Voltage output unit, for exporting the operating voltage of the Micro usb circuits.

Headset plugs detection unit, for the switch-over control signal sent according to the impedance measurement chip, judges the Micro Whether usb interface module accesses wired headset, and the switch-over control signal is transmitted to the switching chip.

6. a kind of mobile terminal, it is characterised in that the mobile terminal includes terminal handler and connects with the terminal handler The Micro usb circuits connect, the Micro usb circuits include：

7. mobile terminal as claimed in claim 6, it is characterised in that the power management chip includes：

8. mobile terminal as claimed in claim 7, it is characterised in that the switching chip includes switching signal and receives list Member, the first pin units, second pin unit and the 3rd pin units, first pin units are corresponded to described in connection Micro usb interface modules, the second pin unit, which corresponds to, connects the USB function control units, the 3rd pin list Member is corresponding to connect the earphone function control unit, and first pin units are under the control of the switching signal receiving unit Switching connects the second pin unit or the 3rd pin units.

9. the mobile terminal as described in claim 6-8 is any, it is characterised in that the impedance measurement chip includes：

10. mobile terminal as claimed in claim 9, it is characterised in that the power management chip further includes：