CN102098035B - Analog switch control circuit and mobile phone - Google Patents
Analog switch control circuit and mobile phone Download PDFInfo
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- CN102098035B CN102098035B CN2010105724730A CN201010572473A CN102098035B CN 102098035 B CN102098035 B CN 102098035B CN 2010105724730 A CN2010105724730 A CN 2010105724730A CN 201010572473 A CN201010572473 A CN 201010572473A CN 102098035 B CN102098035 B CN 102098035B
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Abstract
The invention relates to the field of a mobile terminal, and discloses an analog switch control circuit and a mobile phone. In the analog switch control circuit and the mobile phone which are provided by the invention, a second pin and a third pin of a micro universal serial bus (USB) interface are adopted to be connected with an output end of an analog switch, and a first pin of the micro USB interface is connected with a control end of the analog switch by a voltage division circuit, so that the power supply voltage of a USB line is reasonably utilized; compared with the conventional method of controlling general purpose input/output (GPIO) software, the method for controlling the analog switch by hardware is rapider, simple and effective, and the resource of a GPIO interface is not occupied.
Description
Technical field
The present invention relates to field of mobile terminals, in particular a kind of analog switch control circuit and mobile phone.
Background technology
Along with the development of electronic technology and improving constantly of people's living standard, the use of various electronic equipments is more and more universal.
And analog switch is used in various electronic products widely, is common to an interface with organizing separate signalling channel more, makes by change-over switch and respectively organizes signal according to user's demand flexible conversion and don't influence each other.
Prior art generally is to control the channel that general input/output port (GPIO) comes switching analoging switch with software mode.This control mode is fairly simple flexibly, but brings some problems in some particular field credit union.For example, be connected with main frame in electronic equipment such as mobile phone shutdown situation, software control easily makes mistakes.
Therefore, prior art has yet to be improved and developed.
Summary of the invention
The technical problem to be solved in the present invention is, for the defects of prior art, provides a kind of analog switch control circuit and mobile phone, its fast the control simulation switch switch, and simple in structure, be difficult for makeing mistakes.
The technical scheme that technical solution problem of the present invention adopts is as follows:
A kind of analog switch control circuit, comprise the Micro USB interface, and the analog switch that is connected with the communication of Micro USB interface, wherein, the 2nd pin of described Micro USB interface, the 3rd pin are connected with the output terminal of described analog switch, and the 1st pin of Micro USB interface is connected to the control end of described analog switch by a bleeder circuit.
Described analog switch control circuit, wherein, described bleeder circuit comprises the first resistance and the second resistance, one end of the first resistance is connected to the 1st pin of described Micro USB interface, the other end of the first resistance is connected to the control end of described analog switch, and the other end of described the first resistance also connects with reference to ground by the second resistance.
Described analog switch control circuit, wherein, described analog switch is the single-pole double-throw (SPDT) analog switch, is used for two groups of separate signalling channels are common to an interface, described single-pole double-throw (SPDT) analog switch comprises first pair of input end and second pair of input end.
Described analog switch control circuit, wherein, the resistance of described the first resistance is 36K ohm, the resistance of described the second resistance is 24K ohm.
A kind of mobile phone, comprise a mobile phone body, be arranged on the circuit board in the mobile phone body, and be arranged on analog switch control circuit on the described circuit board, wherein, described analog switch control circuit comprises a Micro USB interface, and an analog switch, the 2nd pin of described Micro USB interface, the 3rd pin are connected with the output terminal of described analog switch, and the 1st pin of Micro USB interface is connected to the control end of described analog switch by a bleeder circuit.
Described mobile phone, wherein, described bleeder circuit comprises the first resistance and the second resistance, one end of the first resistance is connected to the 1st pin of described Micro USB interface, the other end of the first resistance is connected to the control end of described analog switch, and the other end of described the first resistance also connects with reference to ground by the second resistance.
Described mobile phone, wherein, described analog switch is the single-pole double-throw (SPDT) analog switch, is used for two groups of separate signalling channels are common to an interface, described single-pole double-throw (SPDT) analog switch comprises first pair of input end and second pair of input end.
Described mobile phone, wherein, on described circuit board, also be provided with usb data transmission circuit and application program of mobile phone download circuit, described application program of mobile phone download circuit is connected with first pair of input end of described single-pole double-throw (SPDT) analog switch, and described usb data transmission circuit is connected with second pair of input end of described single-pole double-throw (SPDT) analog switch.
Described mobile phone is characterized in that, the resistance of described the first resistance is 36K ohm, and the resistance of described the second resistance is 24K ohm.
A kind of analog switch control circuit provided by the present invention and mobile phone, owing to adopting the 2nd pin, the 3rd pin of described Micro USB interface to be connected with the output terminal of described analog switch, its the 1st pin is connected to the control end of described analog switch by a bleeder circuit, its reasonably utilized the USB line with supply voltage, with the mode control simulation switch of hardware, the method for conventional software control GPIO is quicker, effectively simple, do not take GPIO mouth resource.
Description of drawings
Fig. 1 is Micro USB interface and analog switching circuit reduced graph thereof.
The USB sequential chart of shaking hands when Fig. 2 is software GPIO control simulation switch.
Fig. 3 is the analog switch control circuit figure of the embodiment of the invention.
Fig. 4 is the cell phone appearance structural representation of the embodiment of the invention.
Fig. 5 is the mobile phone circuit structure schematic diagram of the embodiment of the invention.
The USB sequential chart of shaking hands when Fig. 6 is the hardware circuit control simulation switch of the embodiment of the invention.
Embodiment
A kind of analog switch control circuit provided by the present invention and mobile phone, clearer, clear and definite for making purpose of the present invention, technical scheme and advantage, developing simultaneously referring to accompanying drawing, the present invention is described in more detail for embodiment.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
Take the MTK platform mobile phone of certain band USB function as example, Micro USB interface and analog switching circuit reduced graph thereof are as shown in Figure 1.Analog switch adopts single-pole double-throw (SPDT) analog switch 110 among the figure, and the power end VCC of its single-pole double-throw (SPDT) analog switch 110 connects working power VBAT, and the GND termination is with reference to ground.Micro USB(micro USB) interface 100 has become a kind of interface standard gradually, and its 1 pin power supply and 5 pin ground are as charger or USB power source charges interface, and 2 pin and 3 pin are as the USB signal transmission, and 4 pin can use it for anything else.
And UART(program downloading wire) also be a kind of communication interface commonly used on the present mobile phone, such as twin wire UART interface (UTXD and URXD signal among Fig. 1), it mainly can be used for the mobile phone-downloaded application program.Can see, the signal pins on the Micro usb 1 00 is very limited, only has 5.In order to save space and resource, generally adopt a single-pole double-throw (SPDT) analog switch 110, the USB interface on the mobile phone master chip and UART interface are common to 2,3 pin of a Micro USB interface.
The general procedure downloading wire is the charged line not, and USB tape power lead.Like this, mobile phone terminal can be USB line or program downloading wire by detecting what whether have on the Micro usb 1 pin that high level distinguishes insertion just.
Usually the mobile phone master chip comes the Enable Pin (control end) of control simulation switch with a universal input output signal (GPIO1 among Fig. 1), to switch different signalling channels.Such as with regard to this kind of mobile phone, the acquiescence original state of this single-pole double-throw (SPDT) analog switch 110 is that channel B 01, B02 are linked to each other with D01, D02 respectively, and A01, A02 disconnect with D01, D02 respectively; Be under the default situations, signal end D-, the D+ of mobile phone Micro USB interface is connected with program downloading end UTXD, URXD.
When the GPIO1 of mobile phone master chip was output as low level, single-pole double-throw (SPDT) analog switch 110 also was that channel B 01, B02 are linked to each other with D01, D02 respectively, and A01, A02 disconnect with D01, D02 respectively; And when the GPIO1 of mobile phone master chip was output as high level, control single-pole double-throw (SPDT) analog switch 110 disconnected B01, B02 respectively with D01, D02 passage, and A01, A02 link to each other with D01, D02 passage respectively.
Because mobile phone is when using the UART interface to download, mobile phone is in improper open state, and the uncontrollable GPIO signal of master chip so generally UART is connected on the signalling channel of single-pole double-throw (SPDT) analog switch 110 acquiescence original states, namely is connected on B01, B02 mouth.
When insertion program downloading wire (UART line), 1 pin VCHG of Micro usb 1 00 is low level like this, and single-pole double-throw (SPDT) analog switch 110 acquiescence B01, B02 link to each other with D01, D02, and mobile phone just can normally download.
Because USB_DM, the USB_DP of USB function end are connected to respectively A01, A02.When inserting the USB line, handset identity is to the high level of Micro usb 1 pin, mobile phone can switch to A01, A02 with the signalling channel of single-pole double-throw (SPDT) analog switch 110 by control GPIO1 and be connected with D01, D02 respectively under open state, use USB function.
In actual applications, can run into a sequence problem, cause mobile phone under off-mode, can't correctly be identified as USB device by computer.By analyzing the protocol specification of USB communication, learn the Ji Li of usb host (such as computer) identification peripheral hardware, when usb host detects voltage difference on signal wire D+, the D-, just thinking has peripheral hardware to insert, start and the hand shake procedure of peripheral hardware, if handshake of the 500 milliseconds of transmissions in every interval is the continuous correct response that does not all obtain peripheral hardware for three times, shake hands overtime, what main frame was then thought insertion is invalid USB device.This process is about 1500 milliseconds.
End thus again sees the mobile phone, as shown in Figure 1, under the mobile phone power-on state, insert the USB line, mobile phone detect main frame output to behind the 5V voltage (VCHG) on the usb 1 pin can be immediately be that high level switches single-pole double-throw (SPDT) analog switch 110 passage A01, A02 are connected with D01, D02 respectively by control GPIO1, mobile phone and main frame can normally be shaken hands within the time limit, use the USB function.
And under the off-mode, after inserting the USB line, signal sequence as shown in Figure 2.The 5V voltage (VCHG) that mobile phone detects on the usb 1 pin is opened each modular power source immediately, and by the UART communications protocol, UTXD and URXD signal can be exported one group of level that just changes (shown in the D+/UTXD line as shown in Figure 2).Because B01, the B02 of default conditions Imitating switch link to each other with D01, D02 passage respectively, D+, D-level are subjected to UTXD, URXD effect of signals.Behind the pressure reduction of Host Detection D+, D-, thinking has the access of USB peripheral hardware, just starts hand shake procedure.And at this moment mobile phone is only finished boot program, control GPIO1 is that passage A01, the A02 of high level (shown in the GPIO1 line as shown in Figure 2) ability switching analoging switch links to each other with D01, D02, this moment analog switch about 2.3S switching time, at this moment the hand shake procedure of main frame is overtime, and computer can't detect mobile phone as USB device.
Thus, a kind of analog switch control circuit 200 that the embodiment of the invention provides, as shown in Figure 3, comprise Micro USB interface 210, and the single-pole double-throw (SPDT) analog switch 220 that is connected with 210 communications of Micro USB interface, be used for two groups of separate signalling channels are common to an interface, as shown in Figure 3, described single-pole double-throw (SPDT) analog switch 220 comprises first couple of input end B1 and B2 and the second couple of input end A1 and A2, for example, the first couple of input end B1 and the B2 of described single-pole double-throw (SPDT) analog switch 220 are connected to respectively application program of mobile phone downloading end UTXD and URXD, its second couple of input end A1 and A2 are connected to respectively UBS data transmit-receive end USB_DP and USB_DM.
Wherein, the 2nd pin of described Micro USB interface 210, the 3rd pin are connected with D2 with the output terminal D1 of described single-pole double-throw (SPDT) analog switch 220, and the 4th pin of Micro USB interface 210 is as other usefulness.The 5th pin connects with reference to ground, and the 1st pin of Micro USB interface 210 is connected to control end C1 and the C2 of described single-pole double-throw (SPDT) analog switch 220 by a bleeder circuit 230.
Further, as shown in Figure 3, described bleeder circuit 230 comprises the first resistance R 1 and the second resistance R 2, one end of the first resistance R 1 is connected to the 1st pin of described Micro USB interface 210, the other end of the first resistance R 1 is connected to control end C1 and the C2 of described single-pole double-throw (SPDT) analog switch 220, and the other end of described the first resistance R 1 also connects with reference to ground by the second resistance R 2.Preferably, the resistance of described the first resistance is 36K ohm, and the resistance of described the second resistance is 24K ohm.
Therefore the analog switch control circuit 200 of the embodiment of the invention changes hardware circuit (namely as shown in Figure 3 bleeder circuit 230) control simulation switch into by original software GPIO signal controlling, has shortened the switching time of analog switch.Such as Fig. 3, change the signal of GPIO1 into by bleeder circuit 230 control signal (control level).VCHG signal on 1 pin of Micro USB interface 210 directly obtains the required control level of single-pole double-throw (SPDT) analog switch by a bleeder circuit that is comprised of R1 and R2.
As shown in Figure 3, when having USB device to insert Micro USB interface 210, the 5V level that main frame output is arranged on the VCHG signal, by bleeder circuit 230 Enable Pin (being control end C1 and the C2) signal of single-pole double-throw (SPDT) analog switch 220 is drawn high, passage switches to A1, A2 and is connected with D1, D2 respectively, and D1, D2 disconnect with B1, B2 passage respectively.Its fast the control simulation switch switch, and simple in structure, be difficult for makeing mistakes.
Analog switch control circuit based on above-described embodiment, the embodiment of the invention also provides a kind of mobile phone, as shown in Figure 4, comprise a mobile phone body 400, be arranged on the circuit board 410 in the mobile phone body 400, and be arranged on analog switch control circuit 200 on the described circuit board 410, as shown in Figure 5, wherein, described analog switch control circuit 200 comprises a Micro USB interface 210, and a single-pole double-throw (SPDT) analog switch 220, is used for two groups of separate signalling channels are common to an interface, as shown in Figure 5, described single-pole double-throw (SPDT) analog switch comprises first couple of input end B1 and B2 and the second couple of input end A1 and A2.
As shown in Figure 5, the 2nd pin (D-), the 3rd pin (D+) of described Micro USB interface 210 are connected with output terminal D2, the D1 of described single-pole double-throw (SPDT) analog switch 220 respectively, and the 1st pin of Micro USB interface 210 is connected to control end C1 and the C2 of described single-pole double-throw (SPDT) analog switch 220 by a bleeder circuit 230.
Further, described bleeder circuit 230 comprises the first resistance R 1 and the second resistance R 2, one end of the first resistance R 1 is connected to the 1st pin of described Micro USB interface 210, the other end of the first resistance R 1 is connected to control end C1 and the C2 of described single-pole double-throw (SPDT) analog switch 220, and the other end of described the first resistance R 1 also connects with reference to ground by the second resistance R 2.Preferably, the resistance of described the first resistance R 1 is 36K ohm, and the resistance of described the second resistance R 2 is 24K ohm.
Further, as shown in Figure 5, on described circuit board 410, also be provided with usb data transmission circuit 240 and application program of mobile phone download circuit 250, described application program of mobile phone download circuit 250 is connected respectively with URXD by its UTXD end and is connected with B2 with first couple of input end B1 of described single-pole double-throw (SPDT) analog switch 220, and the USB_DP of described usb data transmission circuit 240 holds to be connected with USB_DM and is connected A1 with second pair of input end of described single-pole double-throw (SPDT) analog switch 220 and is connected with A2.
As shown in Figure 5, when mobile phone of the present invention is in off-mode, insert the USB line, signal sequence such as Fig. 6.The 5V level that main frame output is arranged on the VCHG signal, by bleeder circuit 230 control signal (namely as shown in Figure 6 control level line) of control end C1 and the C2 of single-pole double-throw (SPDT) analog switch 220 is drawn high, passages in the single-pole double-throw switch (SPDT) 220 switch A1 to be connected with A2 with D1 and to be connected with D2, control D1 and D2 respectively with B1 and the disconnection of B2 passage.Level on D+, the D-just has not been subjected to the effect of signals on UTXD, the URXD, level all is low, until mobile phone terminal is drawn high D+(D+ line as shown in Figure 6), tell main frame to have peripheral hardware to insert, main frame is with regard to the hand shake procedure of startup and peripheral hardware, use the USB function, correctly recognize mobile phone and be USB device.
Therefore, the mobile phone of the embodiment of the invention reasonably utilized the USB line with supply voltage (being the 1st pin voltage of Micro USB interface 210), hardware controls mode control simulation switch in order to bleeder circuit 230, the method of conventional software control GPIO, quicker, effectively simple, do not take GPIO mouth resource, only increase few hardware cost.
In sum, a kind of analog switch control circuit provided by the present invention and mobile phone, owing to adopting the 2nd pin, the 3rd pin of described Micro USB interface to be connected with the output terminal of described analog switch, its the 1st pin is connected to the control end of described analog switch by a bleeder circuit, its reasonably utilized the USB line with supply voltage, with the mode control simulation switch of hardware, the method of conventional software control GPIO, quicker, effectively simple, do not take GPIO mouth resource.
Should be understood that, application of the present invention is not limited to above-mentioned giving an example, and for those of ordinary skills, can be improved according to the above description or conversion, and all these improvement and conversion all should belong to the protection domain of claims of the present invention.
Claims (5)
1. analog switch control circuit, comprise the Micro USB interface, and the analog switch that is connected with the communication of Micro USB interface, it is characterized in that, the 2nd pin of Micro USB interface, the 3rd pin are connected with the output terminal of described analog switch, and the 1st pin of Micro USB interface is connected to the control end of described analog switch by a bleeder circuit;
Described bleeder circuit comprises the first resistance and the second resistance, one end of the first resistance is connected to the 1st pin of described Micro USB interface, the other end of the first resistance is connected to the control end of described analog switch, and the other end of described the first resistance also connects with reference to ground by the second resistance;
Described analog switch is the single-pole double-throw (SPDT) analog switch, is used for two groups of separate signalling channels are common to an interface, and described single-pole double-throw (SPDT) analog switch comprises first pair of input end and second pair of input end.
2. analog switch control circuit according to claim 1 is characterized in that, the resistance of described the first resistance is 36K ohm, and the resistance of described the second resistance is 24K ohm.
3. mobile phone, comprise a mobile phone body, be arranged on the circuit board in the mobile phone body, and be arranged on analog switch control circuit on the described circuit board, it is characterized in that, described analog switch control circuit comprises a Micro USB interface, and an analog switch, the 2nd pin of described Micro USB interface, the 3rd pin are connected with the output terminal of described analog switch, and the 1st pin of Micro USB interface is connected to the control end of described analog switch by a bleeder circuit;
Described bleeder circuit comprises the first resistance and the second resistance, one end of the first resistance is connected to the 1st pin of described Micro USB interface, the other end of the first resistance is connected to the control end of described analog switch, and the other end of described the first resistance also connects with reference to ground by the second resistance;
Described analog switch is the single-pole double-throw (SPDT) analog switch, is used for two groups of separate signalling channels are common to an interface, and described single-pole double-throw (SPDT) analog switch comprises first pair of input end and second pair of input end.
4. mobile phone according to claim 3, it is characterized in that, on described circuit board, also be provided with usb data transmission circuit and application program of mobile phone download circuit, described application program of mobile phone download circuit is connected with first pair of input end of described single-pole double-throw (SPDT) analog switch, and described usb data transmission circuit is connected with second pair of input end of described single-pole double-throw (SPDT) analog switch.
5. according to claim 3 or 4 described mobile phones, it is characterized in that, the resistance of described the first resistance is 36K ohm, and the resistance of described the second resistance is 24K ohm.
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| CN2010105724730A CN102098035B (en) | 2010-12-03 | 2010-12-03 | Analog switch control circuit and mobile phone |
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| CN2010105724730A CN102098035B (en) | 2010-12-03 | 2010-12-03 | Analog switch control circuit and mobile phone |
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| CN102098035B true CN102098035B (en) | 2013-01-02 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105227702A (en) * | 2015-05-28 | 2016-01-06 | 盛耀无线通讯科技（北京）有限公司 | A kind of bilateral cell phone platform USB socket |
| CN107124175B (en) * | 2017-03-29 | 2023-06-13 | 昆明理工大学 | Two-way USB control circuit |
| CN107911696B (en) * | 2017-12-28 | 2019-12-06 | 上海传英信息技术有限公司 | Method and system for distinguishing cameras |
| CN108233913A (en) * | 2018-01-30 | 2018-06-29 | 上海与德科技有限公司 | A kind of key control circuit and electronic equipment |
| CN112968332A (en) * | 2021-02-06 | 2021-06-15 | 读书郎教育科技有限公司 | Compatible device and method for switching TYPE-C interface of tablet personal computer mainboard to UART serial port communication |
| CN114326687B (en) * | 2022-01-07 | 2024-05-24 | 摩登汽车有限公司 | Power domain controller of new energy vehicle and vehicle |
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| CN2790039Y (en) * | 2005-03-28 | 2006-06-21 | 英华达(上海)电子有限公司 | Multifunction universal interface circuit for mobile telephone |
| CN201919042U (en) * | 2010-12-03 | 2011-08-03 | 惠州Tcl移动通信有限公司 | Analog switch control circuit and mobile phone |
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| JP2004334823A (en) * | 2003-05-07 | 2004-11-25 | Sony Corp | Communication line switching circuit and method, information processor, and program recorder |
| TWI296376B (en) * | 2005-10-06 | 2008-05-01 | Holtek Semiconductor Inc | Method and apparatus for detecting the type of interface to which a peripheral device is connetced |
| JP5157933B2 (en) * | 2009-01-21 | 2013-03-06 | 株式会社リコー | Signal switching circuit |
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| CN2790039Y (en) * | 2005-03-28 | 2006-06-21 | 英华达(上海)电子有限公司 | Multifunction universal interface circuit for mobile telephone |
| CN201919042U (en) * | 2010-12-03 | 2011-08-03 | 惠州Tcl移动通信有限公司 | Analog switch control circuit and mobile phone |
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Effective date of registration: 20201225 Address after: 274200 Room 102, 1 / F, Jiahe neighborhood committee, Wenting street, Chengwu County, Heze City, Shandong Province Patentee after: Chengwu Yichang Information Technology Co.,Ltd. Address before: 511400 No.106 Fengze East Road, Nansha District, Guangzhou City, Guangdong Province (self compiled Building 1) x1301-a4845 (cluster registration) (JM) Patentee before: Guangzhou shengxia Intellectual Property Operation Co.,Ltd. Effective date of registration: 20201225 Address after: 511400 No.106 Fengze East Road, Nansha District, Guangzhou City, Guangdong Province (self compiled Building 1) x1301-a4845 (cluster registration) (JM) Patentee after: Guangzhou shengxia Intellectual Property Operation Co.,Ltd. Address before: 516006 Guangdong province Huizhou Zhongkai hi tech Development Zone No. 23 District Patentee before: HUIZHOU TCL MOBILE COMMUNICATION Co.,Ltd. |