CN109446140A - Micro USB interface comprehensive multiplexing circuit and electronic equipment - Google Patents
Micro USB interface comprehensive multiplexing circuit and electronic equipment Download PDFInfo
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- CN109446140A CN109446140A CN201811654185.2A CN201811654185A CN109446140A CN 109446140 A CN109446140 A CN 109446140A CN 201811654185 A CN201811654185 A CN 201811654185A CN 109446140 A CN109446140 A CN 109446140A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/40—Bus structure
- G06F13/4063—Device-to-bus coupling
- G06F13/4068—Electrical coupling
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/42—Bus transfer protocol, e.g. handshake; Synchronisation
- G06F13/4282—Bus transfer protocol, e.g. handshake; Synchronisation on a serial bus, e.g. I2C bus, SPI bus
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2213/00—Indexing scheme relating to interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F2213/0042—Universal serial bus [USB]
Abstract
The present invention provides a kind of Micro USB interface comprehensive multiplexing circuit and electronic equipments, it is related to interface circuit technical field, which includes Micro USB interface, USB Switch chip, USB Audio Codec chip, USB A type interface, earphone interface and inductance；The ID pin of the Micro USB interface is connected with the first L channel pin of the SEL pin of USB Switch chip, earphone interface respectively；Second L channel pin of the earphone interface is connected to earth signal after connecting with the inductance；The usb data pin of USB Audio Codec chip, USB A type interface usb data pin respectively with first group of usb data pin of USB Switch chip to, second group of usb data pin to being correspondingly connected with.Micro USB interface comprehensive multiplexing circuit and electronic equipment provided in an embodiment of the present invention may be implemented to realize phonetic function, charge function, USB data transmission function by a Micro USB interface while use, and use is more convenient, and the user experience is improved.
Description
Technical field
The present invention relates to interface circuit technical field, more particularly, to a kind of Micro USB interface comprehensive multiplexing circuit and
Electronic equipment.
Background technique
Currently, the hardware design framework of USB OTG earphone in the market is all USB OTG function connects USB Audio
Codec chip, USB Audio Codec chip reconnect wired earphone, using USB Audio Codec chip as USB from setting
It is standby.All USB OTG power supply circuit is integrated into inside charging chip on chip for cell phone at present, USB OTG power supply circuit with
What battery charger was walked is same access, and to realize OTG function, and battery of mobile phone voltage passes through Boost inside charging chip
Functional circuit boosts to 5V, is then the power supply of OTG peripheral hardware in the 5V input pin output 5V voltage by charging chip.And it to realize
The input terminal of charge function, charging chip will be used as 5V input terminal, so to realize that OTG ear-phone function combines charging and is
It is self-contradictory.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of Micro USB interface comprehensive multiplexing circuit and electronic equipment,
Micro USB interface OTG ear-phone function and charge function may be implemented while using, and this electronic equipment can also be as
USB data line uses, and use is more convenient, and the user experience is improved.
In a first aspect, the embodiment of the invention provides a kind of Micro USB interface comprehensive multiplexing circuits, comprising: Micro
USB interface, USB Switch chip, USB Audio Codec chip, USB A type interface, earphone interface and inductance；It should
The ID pin of Micro USB interface the first L channel pin phase with the SEL pin of USB Switch chip, earphone interface respectively
Even；Second L channel pin of the earphone interface is connected to earth signal after connecting with the inductance；USB Audio Codec chip
Usb data pin, USB A type interface usb data pin respectively with first group of usb data pin of USB Switch chip
To, second group of usb data pin to being correspondingly connected with.
With reference to first aspect, the embodiment of the invention provides the first possible embodiments of first aspect, wherein on
State circuit further include: OTG power supply circuit, USB charging circuit and diode；The USB5V pin of the Micro USB interface respectively with
The IN pin of the USB charging circuit, the cathode of the diode are connected, and the anode of the diode is managed with the OUT of the OTG power supply circuit
Foot is connected.
The possible embodiment of with reference to first aspect the first, the embodiment of the invention provides second of first aspect
Possible embodiment, wherein the OTG power supply circuit is 5V boost converter chips.
The possible embodiment of with reference to first aspect the first, the embodiment of the invention provides the third of first aspect
Possible embodiment, wherein the forward voltage drop of the diode is less than 0.3V, and the breakdown reverse voltage of the diode is greater than 10V.
With reference to first aspect, the embodiment of the invention provides the 4th kind of possible embodiments of first aspect, wherein should
Earphone interface is 3.5mm earphone interface.
The 4th kind of possible embodiment with reference to first aspect, the embodiment of the invention provides the 5th kind of first aspect
Possible embodiment, wherein the earphone interface is four section earphone interfaces.
With reference to first aspect, the embodiment of the invention provides the 6th kind of possible embodiments of first aspect, wherein should
USB Switch chip is double-pole double throw cake core.
With reference to first aspect, the embodiment of the invention provides the 7th kind of possible embodiments of first aspect, wherein should
USB Audio Codec chip is PCM2912 family chip.
With reference to first aspect, the embodiment of the invention provides the 8th kind of possible embodiments of first aspect, wherein should
The inductance of inductance is 10mH.
Second aspect, the embodiment of the invention also provides a kind of electronic equipment, which includes above-mentioned first aspect
And its Micro USB interface comprehensive multiplexing circuit that one of possible embodiment provides.
The embodiment of the present invention bring it is following the utility model has the advantages that
A kind of Micro USB interface comprehensive multiplexing circuit and electronic equipment, the circuit provided in an embodiment of the present invention include
Micro USB interface, USB Switch chip, USB Audio Codec chip, USB A type interface, earphone interface and electricity
Sense；The ID pin of the Micro USB interface the first L channel with the SEL pin of USB Switch chip, earphone interface respectively
Pin is connected；Second L channel pin of the earphone interface is connected to earth signal after connecting with the inductance；USB Audio Codec
The usb data pin of chip, USB A type interface usb data pin respectively with first group of usb data of USB Switch chip
Pin is to, second group of usb data pin to being correspondingly connected with.Micro USB interface comprehensive multiplexing electricity provided in an embodiment of the present invention
Road, by being arranged USB A type interface and earphone interface in circuit, realize charge function and ear-phone function have both simultaneously, USB number
It is combined according to transmission with charge function；By one inductance ground connection of L channel pin series connection in earphone interface, both can guarantee
L channel sound can be passed to earphone, and earphone insertion detection function may be implemented；It is real-time by using USB Switch chip
Switch usb signal channel, so that ear-phone function, usb data function timesharing are taken into account；It is electric by the way that OTG power supply circuit and USB are charged
Road separates, and in OTG power supply circuit output end series diode, and when charger being prevented to charge, electric current flows backward back OTG power supply electricity
Road；The circuit may be implemented the OTG ear-phone function of Micro USB interface and charge function while use, and can also realize USB number
According to transfer function, use is more convenient, and the user experience is improved.
Other feature and advantage of the disclosure will illustrate in the following description, alternatively, Partial Feature and advantage can be with
Deduce from specification or unambiguously determine, or by implement the disclosure above-mentioned technology it can be learnt that.
To enable the above objects, features, and advantages of the disclosure to be clearer and more comprehensible, preferred embodiment is cited below particularly, and cooperate
Appended attached drawing, is described in detail below.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art be briefly described, it should be apparent that, it is described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is a kind of USB OTG earphone architecture diagram；
Fig. 2 is a kind of earphone interface internal structure schematic diagram；
Fig. 3 is a kind of 3.5mm American Standard headset plug schematic diagram；
Fig. 4 is a kind of connection schematic diagram of Micro USB interface comprehensive multiplexing circuit provided in an embodiment of the present invention；
Fig. 5 is a kind of application scenarios schematic diagram of Micro USB interface comprehensive multiplexing circuit；
Fig. 6 is a kind of mobile phone terminal circuit connection functional block diagram provided in an embodiment of the present invention；
Fig. 7 is a kind of step-up converter circuit connection schematic diagram provided in an embodiment of the present invention.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with attached drawing to the present invention
Technical solution be clearly and completely described, it is clear that described embodiments are some of the embodiments of the present invention, rather than
Whole embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Under every other embodiment obtained, shall fall within the protection scope of the present invention.
Currently, the smart phone in market includes that Android platform, ios platform all support USB OTG function, USB OTG is main
Applied to the connection between a variety of different equipment or mobile device, data exchange is carried out.USB otg standard is completely compatible
On the basis of USB2.0 standard, power management (saving power consumption) function is added, it allows equipment to can not only be used for host, can also make
(dual-purpose OTG) is operated for peripheral hardware.OTG double-duty plant complies fully with USB2.0 standard, is sentenced by the low and high level of the ID pin of USB
Disconnected master-slave equipment, supports host circular order agreement (HNP) and session request agreement (SRP).
Referring to Fig. 1, for USB OTG earphone configuration diagram in the market, wherein the Micro USB interface of OTG earphone with
The Micro USB interface of mobile phone terminal is to slotting connection, and 4 pins (USB_ID) of Micro USB interface are directly grounded, as USB OTG
When earphone is inserted into the Micro USB interface of mobile phone terminal, the CPU of mobile phone terminal will detect that USB_ID signal is low level, CPU
OTG power supply circuit output 5V voltage will be controlled, USB Audio Codec core is output to by 1 pin of Micro USB interface
In the power pin of piece.USB Audio Codec will pass through usb communication, hand with USB main equipment (mobile phone terminal CPU) after powering on
The carry voice of machine sends USB Audio Codec chip, USB Audio Codec chip into usb signal, through USB
PLL (Phase Locked Loop, phaselocked loop) demodulation, the audio digital signals after demodulation are carried out after receiving audio digital signals
It is converted into analog audio signal by digital analog converter, in the power gain control for passing through USB Audio Codec chip interior
Device carries out power gain amplification, then exports to the left and right acoustic channels of earphone, to realize the voice output function of ear-phone function.
In addition, USB Audio Codec chip interior integrates Mike's bias voltage circuit, output is powered to earphone Mike,
After earphone Mike receives analogue voice signal, be transferred to USB Audio Codec chip interior integrated power gain controller into
The amplification of row power gain, amplified analogue voice signal is converted into audio digital signals by analog-digital converter, after conversion
Audio digital signals are modulated in usb signal using PLL, and the CPU of mobile phone terminal is sent to by the channel USB, to realize
Mike's input function of earphone.
On Vehicles Collected from Market the USB OTG earphone of Micro USB interface form only listen to music, phone functions, Bu Nengyong
It is communicated in computer USB, cannot use when ear-phone function and combine charging, cannot be filled when being listened to music, being made a phone call using earphone
Ear-phone function cannot be used when electricity, charging, bring many inconvenience to user.
Based on this, a kind of Micro USB interface comprehensive multiplexing circuit and electronic equipment provided in an embodiment of the present invention can be with
The OTG ear-phone function and charge function for realizing Micro USB interface use simultaneously, and this electronic equipment can also be as USB
Data line uses, and use is more convenient, and the user experience is improved.
For convenient for understanding the present embodiment, first to a kind of Micro USB interface disclosed in the embodiment of the present invention
Comprehensive multiplexing circuit describes in detail.
Embodiment one:
The embodiment of the invention provides a kind of Micro USB interface comprehensive multiplexing circuit, which includes: Micro USB
Interface, USB Switch chip, USB Audio Codec chip, USB A type interface, earphone interface and inductance.
Wherein, the ID pin of the Micro USB interface respectively with the SEL pin of USB Switch chip, earphone interface
First L channel pin be connected, also, the second L channel pin of the earphone interface connect with the inductance after be connected to earth signal.
Here, the inductance of the inductance can be 10mH.Also, the earphone interface can be 3.5mm earphone interface, i.e. American Standard earphone connects
Mouthful, and the interface is four section earphone interfaces, i.e. four section American Standard earphone interfaces.
As Figure 2-3, respectively a kind of earphone interface internal structure schematic diagram and a kind of 3.5mm American Standard headset plug show
It is intended to, in Fig. 2,1 pin indicates " ground ", and 2,5 pins connect L channel, and 3 pins connect right channel, and 4 pins are Mike's input.Scheming
In 3, headset plug definition with earphone interface define respectively corresponds, defined from right end shown in Fig. 3 to left end be respectively as follows: L channel,
Right channel, Mike input,.
In addition, the usb data of the usb data pin of the USB Audio Codec chip in the circuit, USB A type interface
Pin respectively with first group of usb data pin of USB Switch chip to, second group of usb data pin to being correspondingly connected with.Example
Such as, usb data pin D-, D+ of USB Audio Codec chip usb data pipe with USB Switch chip respectively be can be
Foot D1-、D1+ be correspondingly connected with, and usb data pin D-, D+ of USB A type interface usb data with USB Switch chip respectively
Pin D2-、D2+ be correspondingly connected with.
In a kind of wherein embodiment, the USB Switch chip in the circuit is double-pole double throw cake core, also, should
USB Audio Codec chip is PCM2912 family chip.Here, PCM2912 family chip is with USB interface, monophonic
The audio codec of microphone input and stereophone output.
It referring to fig. 4, is a kind of connection schematic diagram of Micro USB interface comprehensive multiplexing circuit, from fig. 4, it can be seen that Micro
2,3 pins of USB interface are connected on corresponding USB_D-, USB_D+ pin of USB Switch chip, Micro USB interface
1 pin be connected in the 5V power pin of USB Switch chip, for USB Switch chip power.Micro USB interface
4 pins (USB_ID) be respectively connected on the SEL pin of USB Switch chip and 5 pins of 3.5MM earphone interface.USB
Two USB of Switch chip are D respectively from holding1-、D1+ and D2-、D2+, the two USB are separately connected USB Audio from end
D-, D+ pin and USB A type interface 2,3 pins of Codec chip.Here, USB Switch chip selects DPDT (double-pole pair
Throw) type USB Switch.Also, USB Audio Codec chip can be TI company PCM2912 family chip, and USB A
Type interface can be the USB interface at the connection end PC.
For the Micro USB interface comprehensive multiplexing circuit shown in Fig. 4, a kind of setting for earphone daughter board circuit can be used as
Meter, wherein USB Audio Codec chip obtains digital audio and video signals from the channel USB, then sends digital audio and video signals to
Chip interior PLL (Phase Locked Loop, phaselocked loop) is demodulated, and is demodulated the digital audio and video signals come and is passed through number again
Mode converter is converted into analog signal, and chip interior integrated power gain controller can amplify analog signal, then lead to
The left and right acoustic channels for crossing earphone play audio.
In addition, USB Audio Codec chip interior integrates Mike's bias voltage, power for earphone Mike, USB Audio
Codec chip receives analog audio signal by the Mike of earphone, by being then forwarded to core after power gain controller amplification
Analog audio signal is converted into digital signal, then is arrived the debugging of this digital signal by PLL by the analog-digital converter inside piece
In usb signal channel, CPU is sent to by Micro USB interface.Audio is believed in this way, realizing the comprehensive multiplexing circuit
Number processing.
In another embodiment, above-mentioned Micro USB interface comprehensive multiplexing circuit further include: OTG power supply circuit,
USB charging circuit and diode, wherein the USB5V pin of the Micro USB interface is managed with the IN of the USB charging circuit respectively
Foot, the cathode of the diode are connected, also, the anode of the diode is connected with the OUT pin of the OTG power supply circuit.
In actual operation, which can be applied to mobile terminal, such as hand
Machine, laptop, tablet computer etc., it is comprehensive for a kind of Micro USB interface referring to Fig. 5 in a kind of wherein embodiment
The application scenarios schematic diagram of multiplex circuit, the circuit include cell phone mainboard circuit and earphone daughter board circuit two parts.Wherein, mobile phone
The specific connection schematic diagram of motherboard circuit is referring to Fig. 6.
By Fig. 5 and Fig. 6 it is found that D- the and D+ signal of CPU is respectively connected on the 2 of Micro USB interface, 3 pins, CPU
ID signal be connected to 4 pins of Micro USB interface, 5 pins of Micro USB interface are ground pins.When USB_ID pin
When being high level, CPU is as USB from equipment；When USB_ID pin is low level, then CPU is as main equipment.
As seen from Figure 6, the end IN of USB charging circuit is also connected on 1 pin of Micro USB interface, Battery pin
It is connected to the anode of battery.It is battery charging by Micro USB interface when charger insertion.Here, USB charging circuit
The charging circuit of the hardware platforms such as MTK (MediaTek.Inc), high pass recommendation can be used.
In addition, according to Fig.6,4 pins, the USB of the USB_ID pin connection Micro USB interface of mobile phone CPU
The detection pin for switching base pin selection, earphone interface of Switch chip.Here, according to the regulation of USB OTG agreement: working as USB_
ID signal be high level when, this terminal device be from equipment, and when USB_ID pin be low level when, this terminal device then based on
Equipment.The USB_ID pin default setting of terminal device is high level, indicates terminal (namely USB_ID pin by default
When without the input of other input signals) it is from equipment.In the present embodiment, USB Audio Codec chip can only be USB from setting
It is standby, to mobile phone and USB Audio Codec chip communication, it is desirable to which mobile phone terminal is as USB main equipment.
In the present embodiment, OTG power supply circuit is 5V boost converter chips, wherein the input terminal of the boost converter
(IN) anode for connecting battery of mobile phone is boost converter power supply by battery.The OUT pin of the boost converter needs to go here and there
Join a diode to reconnect on device to 1 pin of Micro USB interface, to power from equipment.Here, the diode forward pressure
It is reduced to 0.3V, breakdown reverse voltage is greater than 10V, USB OTG power supply voltage range 4.75V~5.25V.Therefore, in practical behaviour
In work, the forward voltage drop of diode should be lower than 0.3V as far as possible, and the output voltage of electric pressure converter is then adjustable to arrive 5.2V or so,
In this way, the cathode voltage of diode is 4.9V or so, meet USB OTG supply voltage requirement.
Here, be a kind of step-up converter circuit connection schematic diagram referring to Fig. 7, as seen from Figure 7, boost converter it is defeated
The input voltage for entering voltage is 3.5V~4.2V namely battery voltage range, which is connected to the VIN of boost converter
On pin；EN pin is the enable pin of boost converter, is connected to the EN pin of CPU；Also, the output end of electric pressure converter
USB5V is connected to 1 pin of Micro USB interface.Here, the output voltage range of electric pressure converter is adjusted by FB pin
Section.
In the present embodiment, by being multiplexed 2,5 pin functions of earphone interface, 2 pins of earphone interface are connected one
On 10mH inductance to earth signal, 5 pins of earphone interface are as USB_ID pin function, to realize earphone insertion detection.This
In, because audio signal is AC signal, inductance resistance exchanges logical direct current, thus audio signal will not be imported into earth signal.
In actual operation, when headset plug is inserted into earphone interface, the tip (L channel pin) of headset plug can be with
2, the 5 pins short circuit of earphone interface, since 2 pins, one 10mH inductance of series connection of earphone interface (divides direct current to earth signal
For amount, the effect of inductance is 0 Ohmic resistance), and because of the 2 of earphone interface, 5 pins and headset plug short circuit, so earphone connects
5 pins (USB_ID) of mouth can be pulled low on earth signal level (0V) by 2 pins, at this point, the ID pin of mobile phone terminal CPU is also
0V, mobile phone terminal is as USB main equipment.When headset plug is extracted, 2,5 pins of earphone interface are returned to open-circuit condition, 5 pipes
Foot (USB_ID) pin is acted on without the drop-down of 2 pins, becomes high level, and the ID pin of mobile phone terminal CPU also becomes high level,
Mobile phone terminal is then used as USB from equipment.
In addition, the channel USB for USB Switch chip switches, and here, the channel selecting pipe of USB Switch chip
Foot (SEL) is equally connected to USB_ID pin, and when headset plug is inserted into earphone interface, USB_ID pin is low level, USB
The D of Switch chip1-、D1+ signal pin is connected on D-, D+ signal pin of USB Audio Codec chip side, thus hand
The usb signal of generator terminal is coupled to the usb signal on USB Audio Codec chip；When headset plug extracts earphone interface,
USB_ID pin is high level, the D of USB Switch chip2-、D2+ signal pin is connected to 2,3 signal pipes of USB A type interface
On foot, so that the usb signal of mobile phone terminal is coupled to the usb signal at the end PC.
For the power supply circuit of USB Audio Codec chip and USB Switch chip, here, when headset plug is inserted into
When earphone interface, USB_ID pin can be pulled low, and mobile phone terminal CPU can detect that ID signal pin is pulled low, then mobile phone terminal CPU meeting
It controls EN pin and exports high level, enable the electric pressure converter of USB OTG power supply circuit, it is made to export 5.1V voltage (USB5V),
USB5V voltage is respectively connected to USB Audio Codec chip VCC power pin, USB by 1 pin of Micro USB interface
1 pin of Switch chip VCC power pin and USB A type interface.
When headset plug is extracted, USB_ID signal is restored to high level again, and mobile phone terminal CPU detects that ID signal pin is
High level can then control the electric pressure converter that EN pin closes USB OTG power supply circuit, it is made not export USB5V voltage, stop
It powers for USB Audio Codec chip and USB Switch chip, to realize the battery power saving management of mobile phone terminal.
When being inserted into charger from USB A type interface, the 5V voltage of charger is connected by 1 pin of Micro USB interface
It is connected to 1 pin of the Micro USB interface of mobile phone terminal, the input terminal of charging circuit, to be charging mobile phone battery.Because of USB
The output end of OTG power supply circuit is connected diode, so charging current will not flow backward into USB OTG power supply circuit, to protect
USB OTG power supply circuit is protected.
When from USB A type interface insertion data line connection PC, since USB_ID signal is high level, USB Switch core
Piece can then be connected to USB admittance on the usb signal of USB A type interface, and mobile phone terminal is as USB from equipment and the end PC usb signal
Connection, to realize usb communication.
In this way, Micro USB interface comprehensive multiplexing circuit provided in this embodiment, by the way that USB A type is arranged in circuit
Interface and earphone interface realize that charge function has both simultaneously with ear-phone function；Pass through the L channel pin series connection in earphone interface
One inductance ground connection, not only can guarantee that L channel sound can be passed to earphone, but also earphone insertion detection function may be implemented；By making
Switch usb signal channel in real time with USB Switch chip, so that ear-phone function, usb data function timesharing are taken into account；Pass through handle
OTG power supply circuit and USB charging circuit separate, and in OTG power supply circuit output end series diode, charger are effectively prevent to fill
Electric current flows backward back OTG power supply circuit when electric, so as to realize the function for charging when listening to music or charging when making a phone call
Energy.
In addition, Micro USB interface comprehensive multiplexing circuit provided in an embodiment of the present invention, is multiplexed Micro USB interface
Earphone interface function, and the original function of Micro USB interface is kept, to can be saved when the circuit is used for electronic equipment
Fall earphone interface, for example, mobile phone complete machine structure designs the thickness that can preferably control mobile phone when being used for Cell Phone Design, makes
Whole externally only one interface of mobile phone is obtained, it is more frivolous and more attractive to facilitate Cell Phone Design.
A kind of Micro USB interface comprehensive multiplexing circuit provided in an embodiment of the present invention, the circuit include that Micro USB connects
Mouth, USB Switch chip, USB Audio Codec chip, USB A type interface, earphone interface and inductance；The Micro
The ID pin of USB interface is connected with the first L channel pin of the SEL pin of USB Switch chip, earphone interface respectively；It should
Second L channel pin of earphone interface is connected to earth signal after connecting with the inductance；The USB number of USB Audio Codec chip
According to pin, USB A type interface usb data pin respectively with first group of usb data pin of USB Switch chip to, second
Group usb data pin is to being correspondingly connected with；The USB5V pin of Micro USB interface is connected with the USB5V pin of USB A type interface.
The circuit may be implemented the OTG of Micro USB interface and function and charge function while use, and can also realize that usb data passes
Transmission function, use is more convenient, and the user experience is improved.
Embodiment two:
The embodiment of the invention also provides a kind of electronic equipment, which includes above-described embodiment one and its possible
The Micro USB interface comprehensive multiplexing circuit that one of embodiment provides.Electronic equipment provided in an embodiment of the present invention, and it is above-mentioned
The Micro USB interface comprehensive multiplexing circuit technical characteristic having the same that embodiment provides, so also can solve identical skill
Art problem reaches identical technical effect.
It is apparent to those skilled in the art that for convenience and simplicity of description, foregoing description electronics is set
Standby specific work process, can be with reference to the corresponding process in aforementioned Micro USB interface comprehensive multiplexing circuit embodiments, herein
It repeats no more.
Unless specifically stated otherwise, the opposite step of the component and step that otherwise illustrate in these embodiments, digital table
It is not limit the scope of the invention up to formula and numerical value.
In all examples being illustrated and described herein, any occurrence should be construed as merely illustratively, without
It is as limitation, therefore, other examples of exemplary embodiment can have different values.
The flow chart and block diagram in the drawings show the system of multiple embodiments according to the present invention, method and computer journeys
The architecture, function and operation in the cards of sequence product.In this regard, each box in flowchart or block diagram can generation
A part of one module, section or code of table, a part of the module, section or code include one or more use
The executable instruction of the logic function as defined in realizing.It should also be noted that in some implementations as replacements, being marked in box
The function of note can also occur in a different order than that indicated in the drawings.For example, two continuous boxes can actually base
Originally it is performed in parallel, they can also be executed in the opposite order sometimes, and this depends on the function involved.It is also noted that
It is the combination of each box in block diagram and or flow chart and the box in block diagram and or flow chart, can uses and execute rule
The dedicated hardware based system of fixed function or movement is realized, or can use the group of specialized hardware and computer instruction
It closes to realize.
In addition, in the description of the embodiment of the present invention unless specifically defined or limited otherwise, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
In the description of the present invention, it should be noted that term " center ", "upper", "lower", "left", "right", "vertical",
The orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" be based on the orientation or positional relationship shown in the drawings, merely to
Convenient for description the present invention and simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation,
It is constructed and operated in a specific orientation, therefore is not considered as limiting the invention.In addition, term " first ", " second ",
" third " is used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance.
Finally, it should be noted that embodiment described above, only a specific embodiment of the invention, to illustrate the present invention
Technical solution, rather than its limitations, scope of protection of the present invention is not limited thereto, although with reference to the foregoing embodiments to this hair
It is bright to be described in detail, those skilled in the art should understand that: anyone skilled in the art
In the technical scope disclosed by the present invention, it can still modify to technical solution documented by previous embodiment or can be light
It is readily conceivable that variation or equivalent replacement of some of the technical features；And these modifications, variation or replacement, do not make
The essence of corresponding technical solution is detached from the spirit and scope of technical solution of the embodiment of the present invention, should all cover in protection of the invention
Within the scope of.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (10)
1. a kind of Micro USB interface comprehensive multiplexing circuit characterized by comprising Micro USB interface, USB Switch
Chip, USB Audio Codec chip, USB A type interface, earphone interface and inductance；
The ID pin of the Micro USB interface respectively with the SEL pin of the USB Switch chip, the earphone interface
First L channel pin is connected；
Second L channel pin of the earphone interface is connected to earth signal after connecting with the inductance；
The usb data pin of the USB Audio Codec chip, the USB A type interface usb data pin respectively with institute
First group of usb data pin of USB Switch chip is stated to, second group of usb data pin to being correspondingly connected with.
2. Micro USB interface comprehensive multiplexing circuit according to claim 1, which is characterized in that further include: OTG power supply
Circuit, USB charging circuit and diode；
The USB5V pin of the Micro USB interface respectively with the IN pin of the USB charging circuit, the diode it is negative
Extremely it is connected, the anode of the diode is connected with the OUT pin of the OTG power supply circuit.
3. Micro USB interface comprehensive multiplexing circuit according to claim 2, which is characterized in that the OTG power supply circuit
For 5V boost converter chips.
4. Micro USB interface comprehensive multiplexing circuit according to claim 2, which is characterized in that the diode is just
It is less than 0.3V to pressure drop, the breakdown reverse voltage of the diode is greater than 10V.
5. Micro USB interface comprehensive multiplexing circuit according to claim 1, which is characterized in that the earphone interface is
3.5mm earphone interface.
6. Micro USB interface comprehensive multiplexing circuit according to claim 5, which is characterized in that the earphone interface is
Four section earphone interfaces.
7. Micro USB interface comprehensive multiplexing circuit according to claim 1, which is characterized in that the USB Switch
Chip is double-pole double throw cake core.
8. Micro USB interface comprehensive multiplexing circuit according to claim 1, which is characterized in that the USB Audio
Codec chip is PCM2912 family chip.
9. Micro USB interface comprehensive multiplexing circuit according to claim 1, which is characterized in that the inductance of the inductance
Amount is 10mH.
10. a kind of electronic equipment, which is characterized in that comprehensive multiple including the described in any item Micro USB interfaces of claim 1-9
Use circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811654185.2A CN109446140A (en) | 2018-12-29 | 2018-12-29 | Micro USB interface comprehensive multiplexing circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811654185.2A CN109446140A (en) | 2018-12-29 | 2018-12-29 | Micro USB interface comprehensive multiplexing circuit and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109446140A true CN109446140A (en) | 2019-03-08 |
Family
ID=65542384
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811654185.2A Pending CN109446140A (en) | 2018-12-29 | 2018-12-29 | Micro USB interface comprehensive multiplexing circuit and electronic equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109446140A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110262648A (en) * | 2019-05-15 | 2019-09-20 | 深圳市优博讯科技股份有限公司 | Master device functionality and the parallel method of charge function and hand-held data gathering terminal |
| CN111864854A (en) * | 2020-08-03 | 2020-10-30 | 珠海智融科技有限公司 | Pin multiplexing circuit and working method thereof, and quick charging chip and working method thereof |
-
2018
- 2018-12-29 CN CN201811654185.2A patent/CN109446140A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110262648A (en) * | 2019-05-15 | 2019-09-20 | 深圳市优博讯科技股份有限公司 | Master device functionality and the parallel method of charge function and hand-held data gathering terminal |
| CN111864854A (en) * | 2020-08-03 | 2020-10-30 | 珠海智融科技有限公司 | Pin multiplexing circuit and working method thereof, and quick charging chip and working method thereof |
| CN111864854B (en) * | 2020-08-03 | 2021-04-06 | 珠海智融科技有限公司 | Pin multiplexing circuit and working method thereof, and quick charging chip and working method thereof |
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