CN105071795A - Multiplex circuit based on USB interface - Google Patents
Multiplex circuit based on USB interface Download PDFInfo
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- CN105071795A CN105071795A CN201510505639.XA CN201510505639A CN105071795A CN 105071795 A CN105071795 A CN 105071795A CN 201510505639 A CN201510505639 A CN 201510505639A CN 105071795 A CN105071795 A CN 105071795A
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Abstract
An embodiment of the invention discloses a multiplex circuit based on a USB interface. The multiplex circuit comprises the USB interface, a switch chip, an audio processing unit and a charging unit. The switch chip is connected between the USB interface and the audio processing unit. The circuit also comprises an isolating switch unit. The input end of the isolating switch unit is connected with a charging pin of the USB interface. The output end of the isolating switch unit is connected with the charging unit and the audio processing unit and is used for alternately connecting one of paths between the charging pin and the charting unit or the audio processing unit and isolating the other path according to a voltage value of the charging pin. According to the multiplex circuit, the audio signal pin and the charging pin are jointly used to realize reuse of the USB interface as a headphone jack, and the audio signal and the charging signal are effectively isolated. The circuit is flexible in design and can be cut.
Description
Technical field
The embodiment of the present invention relates to electronic circuit technology, particularly relates to a kind of USB interface-based multiplex circuit.
Background technology
Along with the fast development of smart mobile phone, people can not content just to realization functionally, also propose higher demand to the differentiation of product with to U.S. vision.Wherein ultimate attainment ultra-thin be exactly the large demand of handset designers and consumer.In order to achieve this end, Cell Phone Design will remove the height assessing device in all its bearings, such as 3.5mm earphone is exactly the key factor affecting mobile phone ultrathin design, in order to take into account function and the performance of earphone, a solution needs earphone and USB (UniversalSerialBus, USB) interface adopts multiplexing design, specifically USB interface is multiplexed with earphone interface.For the USB interface of 5 pins (pin), microphone (microphone, the MIC) signal in earphone interface can select ID pin or charging pin to carry out multiplexing usually.
But, adopt ID pin to carry out multiplexing situation, because mobile phone needs the equipment of support many, now just there will be the problem that headset detection is conflicted with other device ids.If MIC signal multiplexing charging pins, time multiplexing, there will be the interference problem that MIC signal is subject to charging path, so need to isolate.
Being illustrated in figure 1 multiplexing USB interface in prior art is the circuit diagram of earphone interface, and this circuit comprises usb 10, switches chip 30, audio treatment unit 40 and charhing unit 50.Particularly, usb 10 is connected with audio treatment unit 40 and charhing unit 50 by switching chip 30, when multiplexing USB interface 10 is earphone interface, the charging pins VBUS of what the MIC holding wire in audio treatment unit 40 was corresponding is usb 10, DM, DP pin that what the left and right sound channels holding wire in audio treatment unit 40 was corresponding is in usb 10, by switching the multiplexing of the handoff functionality control interface of chip 30.As when applying a high level to the EN pin switching chip 30, switching chip 30 makes charging pins VBUS connect charhing unit 50 with regard to controlling inner single-pole double-throw switch (SPDT), mobile phone is charged, when applying a low level to the EN pin switching chip, switching chip 30 makes charging pins VBUS be connected with MIC holding wire with regard to controlling inner single-pole double-throw switch (SPDT), transmission of audio signal, make left and right acoustic channels line S_L, S_H of audio treatment unit and DM, DP pin of usb 10 connect respectively simultaneously, realize multiplexing function.
At present for USB and the multiplexing product design of earphone interface, for the form that multiplexing employing single-pole double throw or the hilted broadsword of MIC signal and charging pins are thrown more, the integrated chip of general employing completes this function, as the switching chip in Fig. 1, need multiplexing circuit more in this scheme, adopt the integrated chip cost of multiplex function relatively high, and circuit can not cutting, circuit design is optimized not.
Summary of the invention
Embodiments of the invention object there are provided a kind of USB interface-based multiplex circuit, is multiplexed with earphone interface to solve with USB interface, and charging pins is subject to charging signals interference problem as transmission MIC signal.
Embodiments provide a kind of USB interface-based multiplex circuit, comprise USB interface, switch chip, audio treatment unit and charhing unit, described switching chip is connected between described USB interface and audio treatment unit, and described circuit also comprises:
Disconnecting switch unit, the input of described Disconnecting switch unit is connected with the charging pins of described USB interface, the output of described Disconnecting switch unit is connected with described charhing unit and described audio treatment unit respectively, for the magnitude of voltage according to described charging pins, alternately wherein of path between charging pins described in conducting and charhing unit or described audio treatment unit, isolates another simultaneously.
The present invention is by providing a kind of USB interface-based multiplex circuit, solve the circuit interference problem of USB interface charging pins as transmission MIC signal multiplexing, effectively isolate the effect of interference signal when achieving MIC signal multiplexing charging pins, circuit design flexibly, can cutting and save user cost.
Accompanying drawing explanation
Fig. 1 is that in prior art, multiplexing USB interface is the circuit diagram of earphone interface;
Fig. 2 is the USB interface-based multiplex circuit schematic diagram of one that the embodiment of the present invention one provides;
Fig. 3 is a kind of isolating switch circuit diagram that the embodiment of the present invention two provides;
Fig. 4 is that the one that the embodiment of the present invention three provides separates switching circuit figure.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.Be understandable that, specific embodiment described herein is only for explaining the present invention, but not limitation of the invention.It also should be noted that, for convenience of description, illustrate only part related to the present invention in accompanying drawing but not entire infrastructure.
Embodiment one
The USB interface-based multiplex circuit schematic diagram of one that Fig. 2 provides for the embodiment of the present invention one, the present embodiment is applicable to the situation that USB interface is multiplexed with earphone interface, the USB interface-based multiplex circuit of the one that the present embodiment provides, comprise usb 10, switch chip 30, audio treatment unit 40 and charhing unit 50, described switching chip 30 is connected between described usb 10 and audio treatment unit 40, and described circuit also comprises:
Disconnecting switch unit 20, the input of described Disconnecting switch unit 20 is connected with the charging pins VBUS of described usb 10, the output of described Disconnecting switch unit 20 is connected with described charhing unit 50 and described audio treatment unit 40 respectively, for the magnitude of voltage according to described charging pins VBUS, alternately wherein of path between charging pins VBUS described in conducting and charhing unit 50 or audio treatment unit 40, isolates another simultaneously.
Exemplary, when usb 10 accesses power source charges, the voltage of charging pins VBUS is relatively high, and Disconnecting switch unit 20 detects the high-voltage value of charging pins VBUS, just connect the path between charging pins VBUS and charhing unit 50, disconnect the path between audio treatment unit 40; Meanwhile, switch the high voltage signal that chip 30 detects VBUS, just disconnect the connection of S_L, S_R audio signal wire of DM, DP pin and audio treatment unit 40 on usb 10, connect corresponding USB function circuit.When usb 10 accesses earphone, the voltage of charging pins VBUS is relatively low, Disconnecting switch unit 20 detects the low voltage value of charging pins VBUS, just connects the path between charging pins VBUS and audio treatment unit 40, disconnects the path between charhing unit 50; Meanwhile, switch the low voltage signal that chip 30 detects VBUS, just connect the connection of S_L, S_R audio signal wire of DM, DP pin and audio treatment unit 40 on usb 10, realize the multiplexing of interface.
The technical scheme that the embodiment of the present invention provides, share with audio signal pin and charging pins and realize USB interface and be multiplexed with earphone interface, and audio signal and charging signals are effectively isolated, the multiplex circuit of earphone MIC signal is designed separately, save the way of single-pole double-throw switch (SPDT), cost-saving, and circuit design flexibly, can cutting.
Embodiment two
A kind of isolating switch circuit diagram that Fig. 3 provides for example two of the present invention, embodiment two is optimized on the basis of enforcement one, and preferably, described Disconnecting switch unit 20 comprises:
Device type detection unit 201, the input of described device type detection unit 201 is connected with described charging pins VBUS, for detecting charging signals or the audio signal of described charging pins VBUS access, and export high level or low level control signal according to the signal type of described charging pins VBUS;
Signal gating control unit 202, first input end is connected with the output of described device type detection unit 201, second input is connected with described charging pins VBUS, first output is connected with the power input of described charhing unit 50, second output is connected with the audio signal input end of described audio treatment unit 40, and the control signal for receiving described device type detection unit 201 controls connection or the disconnection of path between described charging pins VBUS and charhing unit 50 or audio treatment unit 40.
Preferably, device type detection unit 201 comprises comparator U1;
The in-phase input end of described comparator U1 connects second source VDD2, for receiving predetermined reference voltage;
The inverting input of described comparator U2 connects described first power vd D1 by current-limiting resistance R1, and connects described charging pins VBUS by diode D1, and the anode of described diode D1 is connected with described inverting input;
The output of described comparator U1 is connected with the first input end of described signal gating control unit 202, provides control signal for giving described signal gating control unit 202.
The predetermined reference voltage value that comparator U1 reverse input end receives can be carried out design according to circuit design by change first power vd D2 voltage and be regulated.Resistance R1 plays Limited Current, reduces the quiescent dissipation of system, lowest high-current value can be allowed to carry out design alternative according to diode forward conducting.
Preferably, described signal gating control unit 202 comprises:
Two-in-one control switch U2, the control end of described two-in-one control switch U2, as described first input end, is connected with the output of described device type detection unit 201; The input of described two-in-one control switch U2 is connected with described charging pins VBUS; First output of described two-in-one control switch U2 is connected with audio signal processing unit 40 with described charhing unit 50 respectively with the second output.
When two-in-one control switch U2 normally works, when control end input low level, first output of two-in-one control switch U2 is connected with input conducting, and simultaneously second output of two-in-one control switch U2 and input disconnect; When control end input high level, the first output and the input of two-in-one control switch U2 disconnect, and second output of two-in-one control switch U2 is connected with input conducting simultaneously.
Carry out the course of work of devices illustrated kind detecting unit 201 and signal gating control unit 202 below in conjunction with accompanying drawing 3, exemplary, the voltage of the first power vd D1 is 2.8V, and the voltage of second source VDD2 is 2V.
When charging at USB interface access power supply signal, the voltage of USB charging pins is 5V, diode D1 cathode terminal voltage is also 5V, diode D1 cathode voltage is higher than anode voltage, diode D1 direction is ended, then the voltage that comparator U1 reverse input end receives is 2.8V, now, the voltage of the reverse input end of comparator U1 higher than the voltage of input in the same way, comparator U1 output low level.Because the control end of two-in-one control switch U2 is connected with the output of comparator U1, two-in-one control switch U2 control end input low level, two-in-one control switch control USB charging pins is connected with the first output conducting, namely charging pins is connected with charhing unit 50 and disconnects with audio treatment unit 40, realizes charge function.
When USB interface access earphone, earpiece audio signal is AC signal, the voltage of USB charging pins is 0 ~ 1.2V, diode D1 anode voltage is higher than cathode voltage, and diode D1 forward conduction, due to the clamping action of diode D1, the voltage that comparator U1 reverse input end receives is 0 ~ 1.2V, now, comparator U1 reverse input end voltage is lower than input terminal voltage in the same way, and comparator U1 exports high level.Now, two-in-one control switch U2 control end is input as high level, two-in-one control switch U2 control USB charging pins is connected with the second output conducting, and namely charging pins is connected with audio treatment unit 40 and disconnects with charhing unit 50, realizes the isolation transmission of audio signal.
When USB interface does not access any equipment, now comparator U1 reverse input end voltage is 2.8V, identical with the situation that USB interface accesses when power supply charges, and repeats no more.
Technical scheme provided by the invention, can effectively realize USB interface multiplexing as earphone interface, and when multiplexing, audio signal can be isolated with charging signals, eliminates charging signals to the interference of audio signal, compared with prior art, the multiplex circuit of MIC signal is designed separately, save the way of single-pole double-throw switch (SPDT), save cost, can control flexibly by realizing circuit.
Embodiment three
A kind of isolating switch circuit diagram that Fig. 4 provides for the invention process three, preferably, on the basis of embodiment two, described device type detection unit also comprises:
Be connected on the first divider resistance R2 between described first power vd D1 and ground wire and the second divider resistance R3, the in-phase input end of described comparator U1 is connected between described first divider resistance R2 and the second divider resistance R3;
The inverting input of electrostatic defending resistance R4, described comparator U1 is connected to described first power vd D1 by electrostatic defending resistance R4;
The anode of stabilization electric capacity C, described diode D1 is by described stabilization electric capacity C ground connection;
The output of pull-up resistor R5, described comparator U1 is connected to the 3rd power vd D3 by described pull-up resistor R5.
In this enforcement, only adopt first power supply, become bleeder circuit to regulate the predetermined reference voltage of comparator U1 input in the same way flexibly in groups by the first divider resistance R2 and the second divider resistance R3, and reduce by a power supply, cost-saving.
Electrostatic defending resistance R4 is mainly used in reducing electrostatic; protective circuit device; due to equipment in use; USB interface is exposed on device housings; often electrostatic induction can be produced; when this electrostatic induction voltage is transferred on electrostatic defending resistance R4 by diode D1, will consume thereon, the components and parts such as protection comparator U1.
Stabilization electric capacity C, for eliminating shake, prevents the mistake of logic level from overturning.
Pull-up resistor R5 mainly in order to increase the fan-out capability of comparator U1 output, to drive circuit working below.
The technical scheme that the present embodiment provides, is optimized design to isolating switch circuit, this circuit anti-interference ability is strengthened, and saves circuit cost.
Note, above are only preferred embodiment of the present invention and institute's application technology principle.Skilled person in the art will appreciate that and the invention is not restricted to specific embodiment described here, various obvious change can be carried out for a person skilled in the art, readjust and substitute and can not protection scope of the present invention be departed from.Therefore, although be described in further detail invention has been by above embodiment, the present invention is not limited only to above embodiment, when not departing from the present invention's design, can also comprise other Equivalent embodiments more, and scope of the present invention is determined by appended right.
Claims (5)
1. the multiplex circuit based on general-purpose serial bus USB interface, comprise USB interface, switch chip, audio treatment unit and charhing unit, described switching chip is connected between described USB interface and audio treatment unit, it is characterized in that, described circuit also comprises:
Disconnecting switch unit, the input of described Disconnecting switch unit is connected with the charging pins of described USB interface, the output of described Disconnecting switch unit is connected with described charhing unit and described audio treatment unit respectively, for the magnitude of voltage according to described charging pins, alternately wherein of path between charging pins described in conducting and described charhing unit or audio treatment unit, isolates another simultaneously.
2. circuit according to claim 1, is characterized in that, described Disconnecting switch unit comprises:
Device type detection unit, the input of described device type detection unit is connected with described charging pins, for detecting charging signals or the audio signal of the access of described charging pins, and export high level or low level control signal according to the signal type of described charging pins;
Signal gating control unit, first input end is connected with the output of described device type detection unit, second input is connected with described charging pins, first output is connected with the power input of described charhing unit, second output is connected with the audio signal input end of described audio treatment unit, and the control signal for receiving described device type detection unit controls connection or the disconnection of path between described charging pins and charhing unit or audio treatment unit.
3. circuit according to claim 2, is characterized in that:
Described device type detection unit comprises comparator;
The in-phase input end of described comparator connects second source, for receiving predetermined reference voltage;
The inverting input of described comparator connects described first power supply by current-limiting resistance, and connects described charging pins by diode, and the anode of described diode is connected with described inverting input;
The output of described comparator is connected with the first input end of described signal gating control unit, provides control signal for giving described signal gating control unit.
4. circuit according to claim 3, is characterized in that, described device type detection unit also comprises:
Be connected on the first divider resistance between described first VDD-to-VSS line and the second divider resistance, the in-phase input end of described comparator is connected between described first divider resistance and the second divider resistance;
Electrostatic defending resistance, the inverting input of described comparator is connected to described first power supply by electrostatic defending resistance;
Stabilization electric capacity, the anode of described diode is by described stabilization capacity earth;
Pull-up resistor, the output of described comparator is connected to the 3rd power supply by described pull-up resistor.
5. circuit according to claim 2, is characterized in that, described signal gating control unit comprises:
Two-in-one control switch, the control end of described two-in-one control switch, as described first input end, is connected with the output of described device type detection unit; The input of described two-in-one control switch is connected with described charging pins; First output of described two-in-one control switch is connected with audio signal processing unit with described charhing unit respectively with the second output.
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