CN102096651B - Based on the handset port multiplex circuit of standard Micro USB interface - Google Patents
Based on the handset port multiplex circuit of standard Micro USB interface Download PDFInfo
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- CN102096651B CN102096651B CN201010599542.7A CN201010599542A CN102096651B CN 102096651 B CN102096651 B CN 102096651B CN 201010599542 A CN201010599542 A CN 201010599542A CN 102096651 B CN102096651 B CN 102096651B
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Abstract
The invention provides a kind of based on standard Micro? the handset port multiplex circuit of USB interface, comprising: interface device, analog switch; Interface device the 2nd, 3 pins are connected with the common port the 8th of analog switch, 7 pins respectively, the 4th pin of interface device receives the earphone MIC input end of baseband processor by the first magnetic bead, the 5th pin of interface device is connected to signal ground by the second magnetic bead; 1st pin of analog switch connects the positive signal end of baseband processor, 12nd pin of analog switch connects the negative signal end of baseband processor, analog switch the 2nd, 3 pins receive baseband processor earphone stereo output terminal respectively by the 3rd magnetic bead, the 4th magnetic bead, analog switch the 4th, 5 pins receive the serial ports sending and receiving end of baseband processor respectively by the first diode, the second diode, the 6th pin of analog switch connects signal ground; Analog switch the 9th, 10 pins connect analog switch control circuit, the 11st pin of analog switch connects power supply.
Description
Technical field
The present invention relates to communication technique field, particularly relate to a kind of handset port multiplex circuit based on standard MicroUSB interface.
Background technology
Existing mobile phone, portable media player (PMP), the portable product such as mobile internet device (MID), need various interface to provide data cube computation, Voice & Video exports, and programmes and firmware upgrade, to lithium cell charging to inside.Except 3.5mm or the 2.5mm earphone audio interface of usb data interface and standard, each company uses various interface physical construction and oneself specific interface pin definition.Thereby produce a large amount of various incompatible chargers, the annexes such as data line.
Such as: a typical interface scheme of existing mobile phone is USB and serial port 8 pins or 10 pin homalocephalus connectors, earphone adopts independent four sections of sockets, some mobile phones can also be seen the connector of 20 pins, realize various functional interface, therefore suitable wasting space and cost.Also have problem to be the interface definition disunity of these numerous and complicated, cause accessory can not be general, cause the wasting of resources.
Summary of the invention
The object of the present invention is to provide a kind of handset port multiplex circuit based on standard MicroUSB interface, making when only having a standard MicroUSB interface, realize the functions such as serial ports, USB, earphone, charger, FM antenna.
The embodiment of the present invention is achieved in that a kind of handset port multiplex circuit based on standard MicroUSB interface, comprising: interface device (X6), analog switch (S2); Interface device (X6) the 2nd, 3 pins are connected with the common port the 8th of analog switch (S2), 7 pins respectively, 4th pin of interface device (X6) receives the earphone MIC input end of baseband processor by the first magnetic bead (L4), the 5th pin of interface device (X6) is connected to signal ground by the second magnetic bead (L35); 1st pin of analog switch (S2) connects positive pole (USBD+) signal end of baseband processor, 12nd pin of analog switch (S2) connects negative pole (USBD-) signal end of baseband processor, analog switch (S2) the 2nd, 3 pins receive baseband processor earphone stereo output terminal respectively by the 3rd magnetic bead (L22), the 4th magnetic bead (L33), analog switch (S2) the 4th, 5 pins receive the serial ports sending and receiving end of baseband processor respectively by the first diode (VD1), the second diode (VD6), the 6th pin of analog switch (S2) connects signal ground; Analog switch (S2) the 9th, 10 pins connect analog switch control circuit, the 11st pin of analog switch (S2) connects power supply.
Wherein, also comprise the first resistance (R29), one end of described first resistance (R29) is connected with the anode of described first diode (VD1), and the other end connects and draws power supply (VDDIO).
Wherein, also comprise the second resistance (R48), one end of described second resistance (R48) is connected with the anode of described second diode (VD6), and the other end connects and draws power supply (VDDIO).
Wherein, also comprise triode (VT1), the base stage of described triode (VT1) is connected to the 1st pin of interface device (X6), and the emitter of described triode (VT1) connects signal ground, and described triode (VT1) collector is connected to control pin the 10th pin of analog switch (S2).
Wherein, described triode (VT1) is NPN type triode.
Wherein, described handset port comprises: serial ports, USB interface, earphone interface, charger interface and FM antennal interface.
Wherein, described analog switch (S2) had negative voltage ability.
Wherein, described interface device (X6) is standard MicroUSB interface device.
Wherein, signal wire protection circuit is also comprised.
The embodiment of the present invention compared with prior art, beneficial effect is: the present invention is by introducing SP3T analog switch and associated peripheral circuits, under the cooperation of software, realize serial ports, USB, earphone, charger, the FM antenna multiplexing circuit based on standard MicroUSB interface.Decrease the quantity of handset port and the quantity of interface pin, simplify handset structure design, reduce interface and taken up space, reduce cost of products, improve product competitiveness.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Refer to shown in Fig. 1, the present invention is based on standard MicroUSB interface, X6 is the connector meeting MicroUSB interface specification, when connecting USB device or USBHOST, 1st pin of X6 is VBUS signal, and the 2nd pin is USBD-signal, and the 3rd pin is USBD+ signal, 4th pin is USBID signal, and the 5th pin is ground signalling.In the present invention, the pin that X6 is different can be multiplexed with peripheral hardware corresponding signal when connecting different peripheral hardwares and realize corresponding function.
Present invention employs a two-way SP3T analog switch S2, wherein: S2 the 7th, 8 pins are common port; 1st, 12 pins are USB2.0 signal end, can pass through USB2.0 signal and the signal lower than USB2.0 speed with during common port conducting; 2nd, 3 pins are earpiece audio signal end, can pass through ± the AC signal of 1.5V with during common port conducting; 4th, 5 pins are USB2.0 signal end, can pass through USB2.0 signal and the signal lower than USB2.0 speed with during common port conducting; 6th pin of S2 is signal ground; S2 the 9th, 10 pins are the control signal end of SP3T analog switch; 11st pin of S2 is the power pin of S2.
1st pin of X6 connects the 1st pin of VT1, signal network is VCHARGE, X6 the 2nd, 3 pins are connected to common port the 8th, 7 pins of SP3T analog switch S2, signal network is respectively MICRO_USB_M, MICRO_USB_P, 4th pin of X6 receives the earphone MIC input end of baseband processor by magnetic bead L4, signal network is that the 5th pin of EARPHONE_MIC, X6 is connected to signal ground by magnetic bead L35, and signal network is FM_ANT.1st pin of VT1 is connected to the 1st pin of X6, and the 2nd pin connection signal ground of VT1, the 3rd pin of VT1 is connected to control end the 10th pin of S2.S2 is SP3T analog switch, and the 1st pin of S2 connects the USBD+ end of baseband processor, and signal network is USB_DP, and the 12nd pin connects the USBD-end of baseband processor, and signal network is USB_DM; S2 the 2nd, 3 pins receive mobile phone baseband processor earphone stereo output terminal respectively by magnetic bead L22, L33, signal network is respectively EAR_L, EAR_R; S2 the 4th, 5 pins receive the serial ports sending and receiving end of mobile phone baseband processor respectively by diode VD1, VD6, signal network is respectively URXD1, UTXD1, VD1 and R29 forms the buffer circuit that serial ports receives, VD6 and R48 forms buffer circuit that serial ports sends and earphone disappears POP sound circuit, R29 and R48 is all pulled upward to power vd DIO; 6th pin of S2 connects signal ground; S2 the 7th, 8 pins connect respectively X6 the 3rd, 2 pins; S2 the 9th, 10 pins for control pin, signal network is USB_AUDIO_UART_C1, USB_AUDIO_UART_C0; 11st pin of S2 is the power supply pin of S2, meets VBAT.
Embodiment.
The concrete enforcement principle of circuit of the present invention take specifications and models as the SP3T analog switch of ISL54214 is example, but the principle that the present invention relates to and method are suitable on other SP3T analog switches in the same old way.
1) for ISL54214, its steering logic is:
| C1 | C0 | The pattern of SP3T analog switch |
| 0 | 0 | Analog switch cuts out |
| 0 | 1 | Common port 8,7 pin of S2 respectively with 4, the 5 pin conductings of S2 |
| 1 | 0 | Common port 8,7 pin of S2 respectively with 12, the 1 pin conducting of S2 |
| 1 | 1 | Common port 8,7 pin of S2 respectively with 2, the 3 pin conductings of S2 |
Therefore, when C1C0 is 00, analog switch S2 closes; When C1C0 is 01, common port 8,7 pin of S2 respectively with 4, the 5 pin conductings of S2, realize serial data function; When C1C0 is 10, common port 8,7 pin of S2 respectively with 12, the 1 pin conducting of S2, realize usb data function; When C1C0 is 11, common port 8,7 pin of S2 respectively with 2, the 3 pin conductings of S2, the earpiece audio signal of baseband chip can export.
2) power on before start completes at mobile phone, analog switch by hardware default at serial ports---C1C0 is 01, and namely USB_AUDIO_UART_C1, USB_AUDIO_UART_C0 are respectively low level, high level, just can realize serial ports and download and debug function.By USB_AUDIO_UART_C1, USB_AUDIO_UART_C0 respectively by hardware be set to low level, high level hardware approach a lot, the such as upper pull-down circuit of the additional acquiescence that powers on, or acquiescence is GPIO that is drop-down, pull-up after powering on inside employing mobile phone base band chip, what adopt when the present invention specifically implements is that after powering in mobile phone base band chip, USB_AUDIO_UART_C1 is defaulted as drop-down, that USB_AUDIO_UART_C0 is defaulted as pull-up GPIO, save peripheral upper pull-down circuit, cost-saving.After mobile phone power-on completes, be high level by software control USB_AUDIO_UART_C1, USB_AUDIO_UART_C0 state, namely C1C0 is 11, then common port 8,7 pin of S2 respectively with 2, the 3 pin conductings of S2, then after plugged earphone, just can carry out the output of earphone stereo music, realize earphone stereo circuit.When after insertion USB data line or charger, because the 1st pin of USB data line is VBUS---5V voltage, and the 1st pin of charger is also 5V and above voltage, therefore VCHARGE network is high level, this high level triggers mobile phone base band chip and produces interruption, then mobile phone base band chip is by USB_AUDIO_UART_C1, USB_AUDIO_UART_C0 is set to high level respectively, low level, namely C1C0 is 10, the common port 8 of S2, 7 pins respectively with 12 of S2, 1 pin conducting, if USB, then PC will enumerate mobile phone, complete storage or charge function, if standard or non-standard charger, then just only charge, thus realize usb data or charging circuit.
3) when after plugged earphone, the MIC of earphone is actual, and what connect is the 4th pin of X6,5th pin of what the ground of earphone connect is X6, and simulation switch S 2 acquiescence is earphone conducting after start, the then left and right sound track signals EAR_L of earphone, the equal conducting of EAR_R and MIC signal EARPHONE_MIC after start, namely realize earphone call and stereo music circuit, earphone music and the call function of mobile phone can be realized.Simultaneously, because the ground wire of earphone is longer, it is good FM antenna, 5th pin of X6 is passed through magnetic bead ground connection by the present invention, magnetic bead does not affect direct current and low frequency signal, therefore charging and USB function is not affected, but in the frequency range (about 60M ~ 110Mhz) of FM signal, magnetic bead presents larger impedance, FM_ANT network is directly received the antenna input of FMtuner, just FM reception signals can be delivered to the antenna input of FMtuner instead of import the signal ground of mobile phone, realize FM reception antenna circuit, and then realize radio function, and do not need to draw a FM antenna in addition, simplified design, cost-saving.
4) invention increases serial ports and receive buffer circuit, object is the Serial Port Line input of mating different voltage, and the buffer circuit of serial ports receiving branch is made up of diode VD1 and pull-up resistor R29.In addition, because mobile phone power-on front simulation switch S 2 is given tacit consent at serial ports, therefore, insert earphone in the case of power-off and start shooting, at this moment earphone is actual is and serial ports conducting, if now serially printing Debugging message, the output of serial ports will output to earphone, and earphone will be heard ear-piercing POP sound.Due to the voltage all very high (about 2.8V) that serial ports exports, generally can exceed the tolerance range of earphone, likely potential damage be caused to user's ear, also can cause damage to earphone simultaneously.In order to address this problem; the present invention too increases buffer circuit at serial ports transmitting branch; be made up of VD6 and R48; R29 and R48 is pulled upward to VDDIO power supply respectively; POP mail topic when earphone is started shooting again is inserted under so just can solving power down condition; its principle is: the impedance of earphone end is very little; general standard earphone is 32 ohm; if R48 resistance is selected much larger than earphone impedance; then serial ports outputs to the dividing potential drop of just R48 and earphone impedance on earphone; amplitude can be very little, and user generally can't hear, and just reaches the object of protection earphone and elimination POP sound.
5) the present invention adds a NPN triode VT1 on the control pin C0 of analog switch.Insert in USB line charging start process in the case of power-off, owing to having started shooting, front simulation switch is also given tacit consent at serial ports, at this moment in fact USB data line has been received on Serial Port Line, because serial ports is all high level when not working, and at this moment USB data line and the true conducting of serial ports, therefore the high level on serial ports is caused can to make, as the USBHOST ends such as PC report an error when enumerating mobile phone USB device, to point out the fault of similar " USB device of None-identified ".After increase VT1, when after insertion USB line, VCHARGE is high, then the C0 of S2 is forced to draw into low level, and the steering logic C1C0 of such S2 just becomes X0, avoids 01 and is connected to the situation of serial ports, after user extracts USB line, the C0 control pin of S2 controls by the GPIO of mobile phone base band chip again, doing so avoids USBHOST end and occurs " USB device of None-identified " fault, affect Consumer's Experience.
6) after user inserts charger, (standard charger and non-standard charger is comprised), the power pin of charger connects the 1st pin of X6, the signal ground pin of charger connects the 5th pin of X6, because magnetic bead L35 impedance when direct current is very little, short circuit can be regarded as, then be equivalent to the signal ground pin of charger and the signal ground conducting of mobile phone, realize charging circuit, therefore can charge to mobile phone.The identification of standard charger and non-standard charger is completed by software.
7) because earphone is alternating voltage through the sound signal after straight, containing negative voltage, therefore selected analog switch will have the ability necessarily crossing negative voltage, and the present invention can be used but not limited to the analog switch that specification signal is ISL54214.
The present invention is mainly used in mobile phone but is not limited to mobile phone, also can be applied to other electronic products.This invention meets the developing direction of the portable device interface such as mobile phone, has very high practical value and innovative value.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. based on a handset port multiplex circuit for standard MicroUSB interface, it is characterized in that, comprising: interface device (X6), analog switch (S2), interface device (X6) the 2nd, 3 pins are connected with the common port the 8th of analog switch (S2), 7 pins respectively, 4th pin of interface device (X6) receives the earphone MIC input end of baseband processor by the first magnetic bead (L4), the 5th pin of interface device (X6) is connected to signal ground by the second magnetic bead (L35), 1st pin of analog switch (S2) connects positive pole (USBD+) signal end of baseband processor, 12nd pin of analog switch (S2) connects negative pole (USBD-) signal end of baseband processor, the 2nd of analog switch (S2), 3 pins are respectively by the 3rd magnetic bead (L22), 4th magnetic bead (L33) receives baseband processor earphone stereo output terminal, the 4th of analog switch (S2), 5 pins are respectively by the first diode (VD1), the serial ports sending and receiving end of baseband processor received by second diode (VD6), 6th pin of analog switch (S2) connects signal ground, analog switch (S2) the 9th, 10 pins connect analog switch control circuit, the 11st pin of analog switch (S2) connects power supply,
Also comprise the first resistance (R29), one end of described first resistance (R29) is connected with the anode of described first diode (VD1), and the other end connects and draws power supply (VDDIO);
Also comprise the second resistance (R48), one end of described second resistance (R48) is connected with the anode of described second diode (VD6), and the other end connects and draws power supply (VDDIO);
Described analog switch (S2) is specially two-way SP3T analog switch; Power on before start completes at mobile phone, described analog switch (S2) realizes serial port circuit by hardware default, namely common port 8,7 pin of analog switch (S2) respectively with 4,5 pin conductings of analog switch (S2); After mobile phone power-on completes, by analog switch described in software control (S2) common port 8,7 pin respectively with 2,3 pin conductings of analog switch (S2), realize earphone stereo circuit; When after insertion USB data line or charger, high level triggers baseband processor and produces interruption, common port 8,7 pin that baseband processor makes described analog switch (S2) respectively with 12,1 pin conducting of analog switch (S2), realize usb data or charging circuit.
2. the handset port multiplex circuit based on standard MicroUSB interface as described in any one of claim 1, it is characterized in that, also comprise triode (VT1), the base stage of described triode (VT1) is connected to the 1st pin of interface device (X6), the emitter of described triode (VT1) connects signal ground, and described triode (VT1) collector is connected to control pin the 10th pin of analog switch (S2).
3., as claimed in claim 2 based on the handset port multiplex circuit of standard MicroUSB interface, it is characterized in that, described triode (VT1) is NPN type triode.
4., as claimed in claim 1 based on the handset port multiplex circuit of standard MicroUSB interface, it is characterized in that, described handset port comprises: serial ports, USB interface, earphone interface, charger interface and FM antennal interface.
5., as claimed in claim 1 based on the handset port multiplex circuit of standard MicroUSB interface, it is characterized in that, described analog switch (S2) had negative voltage ability.
6., as claimed in claim 1 based on the handset port multiplex circuit of standard MicroUSB interface, it is characterized in that, described interface device (X6) is standard MicroUSB interface device.
7., as claimed in claim 1 based on the handset port multiplex circuit of standard MicroUSB interface, it is characterized in that, also comprise signal wire protection circuit.
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| CN201010599542.7A CN102096651B (en) | 2010-12-22 | 2010-12-22 | Based on the handset port multiplex circuit of standard Micro USB interface |
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| CN201010599542.7A CN102096651B (en) | 2010-12-22 | 2010-12-22 | Based on the handset port multiplex circuit of standard Micro USB interface |
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| CN102096651B true CN102096651B (en) | 2016-03-30 |
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| CN102957980B (en) * | 2011-08-18 | 2017-08-11 | 中兴通讯股份有限公司 | Headphone device, earphone and the method using Headphone device process signal |
| CN103220598B (en) * | 2012-01-18 | 2016-03-30 | 天地融科技股份有限公司 | A kind of audio interface adaptive device and audio signal reception equipment |
| CN102739830B (en) * | 2012-07-09 | 2015-06-03 | 上海摩软通讯技术有限公司 | Mobile phone capable of being externally connected with antenna |
| CN103678227B (en) * | 2012-09-26 | 2017-10-17 | 炬芯（珠海）科技有限公司 | USB functions and network function share the circuit and method of USB interface |
| CN103747305B (en) * | 2013-12-30 | 2017-06-23 | 福建星网视易信息系统有限公司 | A kind of anti-burnout circuit and set-top box |
| CN106162445A (en) * | 2015-04-28 | 2016-11-23 | 北京智美传媒股份有限公司 | A kind of headset plugging plosive suppression circuit |
| CN106658283B (en) * | 2015-11-04 | 2019-06-04 | 深圳市海能达通信有限公司 | The system that double contact pin type earphone interfaces automatically switch |
| CN105868141B (en) * | 2016-04-18 | 2019-09-27 | 深圳市树源科技有限公司 | Digital interface adapter |
| CN108153626B (en) * | 2017-11-15 | 2020-12-01 | 中国电子科技集团公司第三十二研究所 | USB, serial port multiplexing and safety isolation system |
| CN111130596B (en) * | 2019-11-14 | 2021-08-03 | 荣耀终端有限公司 | Multiplexing circuit, interface circuit system and mobile terminal |
| CN113949755B (en) * | 2020-07-17 | 2023-01-31 | 荣耀终端有限公司 | Electronic equipment and wired earphone |
| CN116015258B (en) * | 2021-10-22 | 2024-03-15 | 荣耀终端有限公司 | Switching circuit and electronic device |
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