CN102693117B - Interface circuit and there is the electronic installation of interface circuit - Google Patents
Interface circuit and there is the electronic installation of interface circuit Download PDFInfo
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- CN102693117B CN102693117B CN201110073659.6A CN201110073659A CN102693117B CN 102693117 B CN102693117 B CN 102693117B CN 201110073659 A CN201110073659 A CN 201110073659A CN 102693117 B CN102693117 B CN 102693117B
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Abstract
A kind of interface circuit and there is the electronic installation of interface circuit.This interface circuit is for comprising the electronic installation of the first audio terminal and audio-frequency module, and interface circuit comprises detection module, control module and handover module.Detection module is electrically connected the first audio terminal, and when the first audio terminal is electrically connected with the second audio terminal output detections signal; Control module comprises detection pin, Signal reception pin and signal and sends pin; Handover module is electrically connected on Signal reception pin, signal sends pin, the first audio terminal and audio-frequency module.Control module is when receiving detection signal, control handover module Signal reception pin is electrically connected with the first audio terminal, and judge whether Signal reception pin receives a lastest imformation, if having, control handover module and Signal reception pin and signal transmission pin are electrically connected the first audio terminal; Otherwise control handover module and audio-frequency module is electrically connected the first audio terminal.The present invention reduces component count, reduces costs and instantaneous noise.
Description
Technical field
The present invention relates to a kind of interface circuit and there is the electronic installation of interface circuit, refer to that one is applied to a kind of interface circuit without the electronic installation of synchronous bridge joint seat (Dock) type especially.
Background technology
In the electronic product of existing plug and play (Plug and Play, PNP), a type is wherein had to be be not configured with synchronous bridge joint seat.Consult Fig. 1, the source of sound output interface circuit 920 that the electronic installation of this type has 3.5mm audio terminal (phonejack) 910 by usually carrys out output sound source signal (i.e. AUD_RO and AUD_LO).But, when electronic installation is for carrying out program updates, then also need another program updates interface circuit 940 being configured with a transmit port (connector) 930 as shown in Figure 2, could by the information transmission of required renewal in microprocessor (Micro ControllerUnit, MCU) 950 wherein.Therefore, for the electronic installation of type not being configured with synchronous bridge joint seat, two interface circuits (i.e. source of sound output interface circuit 920 and program updates interface circuit 940) will be needed, not only cost of manufacture is higher, and under general use, transmit port 930 in order to transmit lastest imformation will, without any effect, make transmit port 930 be in idle state for a long time and cause waste.
Therefore, the electronic installation providing a kind of interface circuit and have interface circuit is needed to solve the problems referred to above.
Summary of the invention
Therefore, object of the present invention, is namely providing a kind of interface circuit that program updates and source of sound can be exported two functions and integrate mutually.
So, interface circuit of the present invention, this interface circuit is applied to an electronic installation, and this electronic installation comprises first audio terminal that can be electrically connected with one second audio terminal, and an audio-frequency module, this interface circuit comprises a detection module, a control module and a handover module.This detection module is electrically connected on this first audio terminal, and exports a detection signal when this first audio terminal is electrically connected with this second audio terminal; This control module comprise one be electrically connected on this detection module and in order to receive this detection signal detection pin, a Signal reception pin and a signal send pin; This handover module is electrically connected on this Signal reception pin, this signal sends pin, this first audio terminal and this audio-frequency module; Wherein, this control module is when this detection pin receives this detection signal, control this handover module this Signal reception pin is electrically connected with this first audio terminal, and judge whether this Signal reception pin receives a lastest imformation sent by this second audio terminal, if have, then control this handover module and this Signal reception pin and this signal transmission pin are electrically connected this first audio terminal, to carry out program updates; If this control module judges that this Signal reception pin does not receive this lastest imformation, then control this handover module and this audio-frequency module is electrically connected this first audio terminal, make this audio-frequency module can send a sound source signal to this second audio terminal.
So, by the switching of handover module, the Function Integration Mechanism that the function of program updates and source of sound can be exported, in same interface circuit, to reduce the quantity of assembly, and simplifies the complexity of circuit design.
Furthermore, handover module comprises one first switch unit and one second switch unit, first switch unit is electrically connected on Signal reception pin, signal sends pin and the first audio terminal, second switch unit is electrically connected on the first audio terminal and audio-frequency module, when control module judges that Signal reception pin receives lastest imformation, then control the first switch unit and Signal reception pin and signal transmission pin are electrically connected the first audio terminal; When control module judges that Signal reception pin does not receive lastest imformation, then control the second switch unit and audio-frequency module is electrically connected the first audio terminal.
Moreover, first audio terminal has the first pin of a ground connection, one second pin, the 4th pin that one the 3rd pin and is electrically connected with the second pin, control module also comprises one second and controls pin and one the 3rd control pin, the first communication port that first switch unit has one to be electrically connected on the 4th pin, the one second communication port being electrically connected on the 3rd pin, one the first transmit port being electrically connected on Signal reception pin, one is electrically connected on the second transmit port that signal sends pin, one is electrically connected on the first control port that the 3rd controls pin, and the second control port that is electrically connected on the second control pin, whether first control port in order to control the electrical connection of the first communication port and the first transmit port, whether second control port in order to control the electrical connection of second communication port and the second transmit port.Control module is when detecting pin and receiving detection signal, control the 3rd control pin the first communication port of the first switch unit is electrically connected with the first transmit port, be electrically connected with the 4th pin of the first audio terminal to make Signal reception pin, and when control module judges that Signal reception pin receives lastest imformation, then control the second control pin the second communication port of the first switch unit is electrically connected with the second transmit port, send pin to make Signal reception pin and signal and be electrically connected the 4th pin and the 3rd pin respectively.
In addition, control module also comprises one first and controls pin, sound source signal comprises one first sound source signal and one second sound source signal, and the second switch unit has a third communication port, one the 4th communication port, one the 3rd transmit port, one the 4th transmit port and one the 3rd control port.Third communication port is electrically connected on the 4th pin of the first audio terminal and the first communication port of the first switch unit; 4th communication port is electrically connected on the 3rd pin of the first audio terminal and the second communication port of the first switch unit; 3rd transmit port is electrically connected on audio-frequency module and receives the first sound source signal; 4th transmit port is electrically connected on audio-frequency module and receives the second sound source signal; 3rd control port is electrically connected on the first control pin, in order to control third communication port and the 3rd transmit port, and the 4th communication port whether be electrically connected with between the 4th transmit port, wherein when control module judges that Signal reception pin does not receive lastest imformation, then control the first control pin the third communication port of the second switch unit is electrically connected with the 3rd transmit port, and the 4th communication port be electrically connected with the 4th transmit port, be electrically connected the first audio terminal to make audio-frequency module.
Detection module has one first resistance and one second resistance, first resistance is electrically connected between the second pin of a power supply and the first audio terminal, between the 4th pin that second resistance is electrically connected on the first audio terminal and ground, and when the first audio terminal is electrically connected with the second audio terminal, by the electrical connection output detections signal of the first resistance and the second resistance.
Electronic installation of the present invention, comprising: one first audio terminal, and this first audio terminal can for one second audio terminal electrical connection; One audio-frequency module; And an above-mentioned interface circuit.
Effect of the present invention is, the Function Integration Mechanism that the function of program updates and source of sound can be exported is in same interface circuit, the quantity of assembly can be reduced, to reduce costs, and by being electrically connected on by handover module between the first audio terminal and audio-frequency module, the instantaneous noise (pop-noise) produced when the second audio terminal is electrically connected on the first audio terminal can be reduced.
Accompanying drawing explanation
Fig. 1 be illustrate existing without source of sound output interface circuit in the electronic installation of synchronous bridge joint seat type;
Fig. 2 illustrates that the existing electronic installation Program without synchronous bridge joint seat type upgrades interface circuit;
Fig. 3 is the circuitry block schematic diagram of the preferred embodiment that interface circuit of the present invention is described; And
Fig. 4 is the internal circuit diagram of specification interface circuit.
Primary clustering symbol description:
Embodiment
Aforementioned and other technology contents, feature and effect for the present invention, in the following detailed description coordinated with reference to a preferred embodiment of accompanying drawing, can clearly present.
Consulting Fig. 3, is the preferred embodiment of interface circuit of the present invention, and this interface circuit 10 is applied in a kind of plug and play electronic installation 100 of the type without synchronous bridge joint seat, and the present embodiment will illustrate for a vehicle sound equipment, but not as limit.Electronic installation 100 includes one first audio terminal 110 and an audio-frequency module 120, this first audio terminal 110 is electrically connected with one second audio terminal 210 of an external device 200 pluggablely, in the present embodiment, first audio terminal 110 connects hole for 3.5mm source of sound, and the second audio terminal 210 is 3.5mm audio connector.
Coordinate and consult Fig. 4, the first audio terminal 110 has the first pin 111,1 second pin 112, the 3rd pin 113 and the 4th pin 114 be electrically connected with the second pin 112 of a ground connection.
Interface circuit 10 comprises detection module 1, control module 2 and a handover module 3.Detection module 1 is a voltage divider (voltage divider), it has one first resistance R1 and one second resistance R2, first resistance R1 is electrically connected between the second pin 112 of a power supply and the first audio terminal 110, between the 4th pin 114 that second resistance R2 is electrically connected on the first audio terminal 110 and ground, in the present embodiment, the resistance of the second resistance R2 is less than the resistance of the first resistance R1, and the first resistance R1 and the second resistance R2 will produce a detection signal DETECT after the voltage of power supply, when external device 200 is not electrically connected electronic installation 100, namely the second audio terminal 210 is not electrically connected with the first audio terminal 110, the voltage of detection signal DETECT can be in an electronegative potential because of the dividing potential drop of the first resistance R1 and the second resistance R2, and when the first audio terminal 110 is electrically connected with the second audio terminal 210, second audio terminal 210 can cut off the path between the first resistance R1 and the second resistance R2, detection signal DETECT is made to obtain supply voltage and to be in a noble potential.
Control module 2 is a microprocessor, and it comprises, and a detection pin INT (GPIO4), one first controls pin GPIO1, one second control pin GPIO2, the 3rd controls pin GPIO3, a Signal reception pin UART_RX and a signal and sends pin UART_TX.Detect pin INT, first controls pin GPIO1, second controls pin GPIO2 and the 3rd control pin GPIO3 is all a universal input/output end port (General Purpose I/O, GPIO), Signal reception pin UART_RX and signal send a universal asynchronous receiving-transmitting transmitter (the Universal Asynchronous Receiver Transmitter that pin UART_TX is then respectively control module 2 inside, UART, figure do not show) constrained input end, detect the second pin 112 that pin INT is electrically connected on the first audio terminal 110, and receive the detection signal DETECT that detection module 1 exports.
Handover module 3 comprises one first switch unit 31 and one second switch unit 32.First switch unit 31 has one first communication port COM1, a second communication port COM2, one first transmit port NO1, one second transmit port NO2, one first control port S1 and one second control port S2.First communication port COM1 is electrically connected on the 4th pin 114 of the first audio terminal 110, second communication port COM2 is electrically connected on the 3rd pin 113 of the first audio terminal 110, first transmit port NO1 is electrically connected on the Signal reception pin UART_RX of control module 2, the signal that second transmit port NO2 is electrically connected on control module 2 sends pin UART_TX, first control port S1 is electrically connected on the 3rd of control module 2 and controls pin GPIO3, and the second control port S2 is electrically connected on second of control module 2 and controls pin GPIO2.Whether first control port S1 in order to control the electrical connection of the first communication port COM1 and the first transmit port NO1; Whether second control port S2 in order to control the electrical connection of second communication port COM2 and the second transmit port NO2.
Second switch unit 32 has a third communication port COM3, one the 4th communication port COM4, one the 3rd transmit port NO3, one the 4th transmit port NO4 and the 3rd control port S3.Third communication port COM3 is electrically connected on the 4th pin 114 of the first audio terminal 110 and the first communication port COM1 of the first switch unit 31, 4th communication port COM4 is electrically connected on the 3rd pin 113 of the first audio terminal 110 and the second communication port COM2 of the first switch unit 31, 3rd control port S3 is electrically connected on first of control module 2 and controls pin GPIO1, 3rd transmit port NO3 and the 4th transmit port NO4 is electrically connected on audio-frequency module 120, and receive a sound source signal (being respectively one first sound source signal AUDIO_L and one second sound source signal AUDIO_R), 3rd control port S3 is in order to control third communication port COM3 and the 3rd transmit port NO3, and the 4th communication port COM4 whether be electrically connected with between the 4th transmit port NO4.
When the first audio terminal 110 is electrically connected with the second audio terminal 210, control module 2 can detect that the voltage of detection signal DETECT can rise to noble potential from electronegative potential, and control pin GPIO3 by the path conducting between the first communication port COM1 of the first switch unit 31 and the first transmit port NO1 by the 3rd, Signal reception pin UART_RX can be electrically connected with the 4th pin 114 of the first audio terminal 110.Then, control module 2 can judge whether Signal reception pin UART_RX receives a lastest imformation sent by the second audio terminal 210, if have, the second control pin GPIO2 is then made to send a control signal by the path conducting between the second communication port COM2 of the first switch unit 31 and the second transmit port NO2, make signal send pin UART_TX to be electrically connected with the 3rd pin 113 of the first audio terminal 110, thus, control module 2 can carry out bi-directional transmission of information with external device 200, namely receive this lastest imformation and reply relevant message etc., to carry out the renewal of program.
What illustrate is, while control module 2 carries out program updates, control module 2 can control pin GPIO1 by the third communication port COM3 of the second switch unit 32 and the 3rd transmit port NO3 by first, and the 4th path between communication port COM4 and the 4th transmit port NO4 cut off, with the renewal avoiding sound source signal to enter interface circuit 10 and interference program.
And when control module 2 judges that Signal reception pin UART_RX does not receive lastest imformation, then make the first control pin GPIO1 by the third communication port COM3 of the second switch unit 32 and the 3rd transmit port NO3, and the 4th path conducting between communication port COM4 and the 4th transmit port NO4, to be electrically connected with the 4th pin 114 of the first audio terminal 110 and the 3rd pin 113 respectively by the 3rd transmit port NO3 and the 4th transmit port NO4, sound source signal is made to be exported to external device 200.Similarly, while output sound source signal, control module 2 can make the second control pin GPIO2 and the 3rd control pin GPIO3 and cut off path between the second communication port COM2 of the first switch unit 31 and the second transmit port NO2 and the path between the first communication port COM1 and the first transmit port NO1.
Therefore, the information that interface circuit 10 can transmit according to the second audio terminal 210 voluntarily and judge to carry out the renewal of program, or simple source of sound exports, and in order to avoid mutual interference, when carrying out program updates, control module 2 can make the first control pin GPIO1 cut off the outgoing route of sound source signal, and when output sound source signal, the transmission path of lastest imformation when control module 2 can make the second control pin GPIO2 and the 3rd control pin GPIO3 cut-out program updates.So by two kinds of Function Integration Mechanisms in same interface circuit 10, the quantity of assembly can be reduced, to simplify the complexity of circuit design.In addition, utilize the second switch unit 32 by audio-frequency module 120 and the first audio terminal 110 isolated, the instantaneous noise (sonic boom) produced when the second audio terminal 210 is electrically connected on the first audio terminal 110 can be reduced.
In sum, interface circuit 10 of the present invention is by the circuit of program updates, and the circuit that sound source signal exports is integrated mutually, the quantity of assembly can be reduced, reduce costs, and by the first switch unit 31 and the mutual switching of the second switch unit 32, the mutual interference between two circuit can be avoided, also the instantaneous noise produced when the second audio terminal 210 is electrically connected on the first audio terminal 110 can be reduced, therefore really object of the present invention can be reached.
Only as described above, be only preferred embodiment of the present invention, can not limit scope of the invention process with this, namely the simple equivalent variations done of every scope according to claims of the present invention and description of the invention content and modification, all still remain within the scope of the patent.
Claims (7)
1. an interface circuit, this interface circuit is applied to an electronic installation, and this electronic installation comprises first audio terminal that can be electrically connected with one second audio terminal, and an audio-frequency module, and this interface circuit comprises:
One detection module, this detection module is electrically connected on this first audio terminal, and exports a detection signal when this first audio terminal is electrically connected with this second audio terminal;
One control module, this control module comprise one be electrically connected on this detection module and in order to receive this detection signal detection pin, a Signal reception pin and a signal send pin; And
One handover module, this handover module is electrically connected on this Signal reception pin, this signal sends pin, this first audio terminal and this audio-frequency module, this handover module comprises one first switch unit and one second switch unit, this first switch unit is electrically connected on this Signal reception pin, this signal sends pin and this first audio terminal, and this second switch unit is electrically connected on this first audio terminal and this audio-frequency module;
Wherein, this control module is when this detection pin receives this detection signal, control this handover module this Signal reception pin is electrically connected with this first audio terminal, and judge whether this Signal reception pin receives a lastest imformation sent by this second audio terminal, if have, this Signal reception pin and this signal are sent pin and are electrically connected this first audio terminal, to carry out program updates by this first switch unit then controlling this handover module; If this control module judges that this Signal reception pin does not receive this lastest imformation, this audio-frequency module is electrically connected this first audio terminal by this second switch unit then controlling this handover module, makes this audio-frequency module can send a sound source signal to this second audio terminal; And
Wherein, this control module also comprises one first and controls pin, one second control pin and one the 3rd control pin, when carrying out program updates, this control module can make this first control pin cut off the transmission path of this sound source signal, and when export this sound source signal time, this control module can make this second control pin and the 3rd control pin cut off program updates time lastest imformation transmission path.
2. interface circuit according to claim 1, the 4th pin that wherein, this first audio terminal has the first pin of a ground connection, one second pin, one the 3rd pin and are electrically connected with the second pin, this first switch unit comprises:
One first communication port, this first communication port is electrically connected on the 4th pin;
One second communication port, this second communication port is electrically connected on the 3rd pin;
One first transmit port, this first transmit port is electrically connected on this Signal reception pin;
One second transmit port, this second transmit port is electrically connected on this signal and sends pin;
One first control port, this first control port is electrically connected on the 3rd and controls pin, in order to whether to control the electrical connection of this first communication port and this first transmit port; And
One second control port, this second control port is electrically connected on this and second controls pin, in order to whether to control the electrical connection of this second communication port and this second transmit port;
This control module is when this detection pin receives this detection signal, control the 3rd control pin this first communication port of this first switch unit is electrically connected with this first transmit port, be electrically connected with the 4th pin to make this Signal reception pin, and when this control module judges that this Signal reception pin receives this lastest imformation, then control this second control pin this second communication port of this first switch unit is electrically connected with this second transmit port, send pin to make this Signal reception pin and this signal and be electrically connected the 4th pin and the 3rd pin respectively.
3. interface circuit according to claim 2, wherein, this sound source signal comprises one first sound source signal and one second sound source signal, and this second switch unit comprises:
One third communication port, this third communication port is electrically connected on the 4th pin of this first audio terminal and the first communication port of this first switch unit;
One the 4th communication port, the 4th communication port is electrically connected on the 3rd pin of this first audio terminal and the second communication port of this first switch unit;
One the 3rd transmit port, the 3rd transmit port is electrically connected on this audio-frequency module and receives this first sound source signal;
One the 4th transmit port, the 4th transmit port is electrically connected on this audio-frequency module and receives this second sound source signal; And
One the 3rd control port, the 3rd control port is electrically connected on this first control pin, in order to control this third communication port and the 3rd transmit port, and whether is electrically connected between the 4th communication port with the 4th transmit port;
When this control module judges that this Signal reception pin does not receive this lastest imformation, then control this first control pin the third communication port of this second switch unit is electrically connected with the 3rd transmit port, and the 4th communication port be electrically connected with the 4th transmit port, be electrically connected this first audio terminal to make this audio-frequency module.
4. interface circuit according to claim 3, wherein, this detection module has one first resistance and one second resistance, this first resistance is electrically connected between the second pin of a power supply and this first audio terminal, between the 4th pin that this second resistance is electrically connected on this first audio terminal and ground, and when this first audio terminal is electrically connected with this second audio terminal, export this detection signal by the electrical connection of this first resistance and this second resistance.
5. interface circuit according to claim 1, wherein, this electronic installation is one without the plug and play electronic installation of synchronous bridge joint seat type.
6. interface circuit according to claim 1, wherein, this first audio terminal is that a 3.5mm source of sound connects hole, and this second audio terminal is a 3.5mm audio connector.
7. an electronic installation, comprising:
One first audio terminal, this first audio terminal can for one second audio terminal electrical connection;
One audio-frequency module; And
Just like the interface circuit according to any one of claim 1 to 6.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110073659.6A CN102693117B (en) | 2011-03-25 | 2011-03-25 | Interface circuit and there is the electronic installation of interface circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110073659.6A CN102693117B (en) | 2011-03-25 | 2011-03-25 | Interface circuit and there is the electronic installation of interface circuit |
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| CN102693117A CN102693117A (en) | 2012-09-26 |
| CN102693117B true CN102693117B (en) | 2015-08-05 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018011925A1 (en) * | 2016-07-13 | 2018-01-18 | 三菱電機株式会社 | No-voltage output and voltage output switching circuit |
| CN111984569A (en) * | 2019-05-21 | 2020-11-24 | 鸿富锦精密工业(武汉)有限公司 | Interface switching circuit and electronic device using same |
| CN111007774B (en) * | 2019-12-20 | 2020-10-27 | 广州市迪声音响有限公司 | Multi-channel audio signal bidirectional switching circuit and method |
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| CN2657308Y (en) * | 2003-10-17 | 2004-11-17 | 福兴达科技实业（深圳）有限公司 | Miniature network digital code walkman |
| CN101583059A (en) * | 2008-05-15 | 2009-11-18 | 欧力天工股份有限公司 | Noise-cancelling headphone |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070298710A1 (en) * | 2006-06-23 | 2007-12-27 | Sams Trevor J | Audio interfaces |
| TWI380184B (en) * | 2008-11-04 | 2012-12-21 | Wistron Corp | Signal transmission path selecting circuit and method and electronic device applying the circuit |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2657308Y (en) * | 2003-10-17 | 2004-11-17 | 福兴达科技实业（深圳）有限公司 | Miniature network digital code walkman |
| CN101583059A (en) * | 2008-05-15 | 2009-11-18 | 欧力天工股份有限公司 | Noise-cancelling headphone |
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