CN101335535A - Multifunctional interface circuit, mobile terminal, multifunctional interface implementing method - Google Patents
Multifunctional interface circuit, mobile terminal, multifunctional interface implementing method Download PDFInfo
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- CN101335535A CN101335535A CNA2008101296642A CN200810129664A CN101335535A CN 101335535 A CN101335535 A CN 101335535A CN A2008101296642 A CNA2008101296642 A CN A2008101296642A CN 200810129664 A CN200810129664 A CN 200810129664A CN 101335535 A CN101335535 A CN 101335535A
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Abstract
The invention discloses a multifunctional interface circuit, a mobile terminal and a realizing method of the multifunctional interface, wherein, the multifunctional interface circuit comprises an RS232 circuit, a USB circuit, a charging circuit and a high-speed analog switch; the charging circuit is used for realizing the current control of the mobile terminal; the high-speed analog switch is connected to the charging circuit and is connected with the RS232 circuit and the USB circuit for switching the RS232 circuit and the USB circuit, wherein, the high-speed analog switch is connected with a pull-down resistor or a pull-up resistor. By adding the high-speed analog switch and the charging circuit which can change the magnitude of the charging current in the interface circuit, the invention can lead a mobile phone to realize multiple functions at a single interface in a mode of software search, and the circuit needed by the system interfaces of the mobile phone is reduced; and an outward interface of the mobile phone is reduced as well, thus enlarging the type selection range of the interface device of the mobile phone.
Description
Technical field
The present invention relates to the communications field, in particular to versatile interface circuit, portable terminal, versatile interface implementation method.
Background technology
Along with the function such as the portable terminal of mobile phone constantly expands, the data-transformation facility between mobile phone and the PC (PersonalComputer, personal computer) seems particularly important.At present, the mainstream data transmission mode on the market has traditional serial ports, the transmission of IRDA infrared data and the usb data transmission etc. of RS232.
Wherein, the transmission speed of RS232 serial ports is slow, but since this interface can be used for cell phone manufacturer to mobile phone calibrate, situations such as the software download of integration test and Cellphone Repairs department or mobile phones software upgrading, therefore still using at present; The IRDA infrared transmission then requires the PC side that infrared equipment is arranged, thereby its application is restricted; USB interface is because its advantage easy to use, that transfer of data is fast becomes the mode standard that present data in mobile phone transmits.
Therefore, just at present, be arranged at the interface that the mobile phone side is used for transfer of data and comprise RS232 interface and USB interface at least; In addition, mobile phone also must have charger interface; Thus, cause the cell phone system external interface many, interface connection line complexity, a series of problems such as the type selecting scope of handset port device is little.
Summary of the invention
Consider that the problems referred to above of existing in the correlation technique propose one of at least the present invention.For this reason, the object of the present invention is to provide a kind of versatile interface circuit, portable terminal, versatile interface implementation method, in order to address the above problem.
According to an aspect of the present invention, provide a kind of versatile interface circuit.
Versatile interface circuit according to the present invention comprises RS232 circuit and USB circuit, also comprises charging circuit and high-speed analog switch; Charging circuit is used to realize the Current Control of portable terminal; High-speed analog switch is connected to charging circuit, and is connected with the USB circuit with the RS232 circuit, is used for switching between RS232 circuit and USB circuit.Wherein, high-speed analog switch is connected with pull down resistor or pull-up resistor.
Preferably, charging circuit comprises feedback resistance part and charging chip, and feedback resistance partly comprises feedback resistance and be connected to the metal-oxide-semiconductor of feedback resistance, the conducting by metal-oxide-semiconductor or end the resistance value that changes the feedback resistance part; Charging chip is connected to power supply, resistance feedback fraction, high-speed analog switch, is used to realize charging operations.
According to a further aspect in the invention, provide a kind of portable terminal that comprises above-mentioned versatile interface circuit.
According to another aspect of the present invention, provide a kind of versatile interface implementation method.
Versatile interface implementation method according to the present invention comprises the steps:
Inserting external equipment, and detect the size of external equipment input power supply, is under the situation of predetermined value in the size of importing power supply, and high-speed analog switch is switched to the USB circuit;
Check in the USB register and whether have the USB device Query Information;
Wherein, under the situation that is checked through the USB device Query Information, keep high-speed analog switch is connected to the USB circuit;
Check in the given time under the situation less than the USB device Query Information high-speed analog switch to be switched to the RS232 circuit, and use charging circuit to carry out Current Control.
Preferably, before inserting external equipment, also comprise by controlling described metal-oxide-semiconductor making portable terminal be in the step of restriction current status.
Preferably, above-mentioned restriction current status is meant that the electric current of described charging circuit control is less than 500mA.
Preferably, using charging circuit to carry out Current Control specifically comprises the steps:
Send inquiry code to the RS232 circuit and carry out the legitimacy verification of external equipment;
Under the legal situation of verification external equipment, the control metal-oxide-semiconductor changes the resistance value of feedback resistance part, makes charging chip carry out charging operations with maximum charging current.
Preferably, not under the situation of predetermined value in the size of external device power supply (DPS), receive UART check code from the outside, under the situation of verification succeeds, high-speed analog switch is set to keep being connected to the RS232 circuit.
Preferably, above-mentioned predetermined value is 5V.
By above-mentioned at least one technical scheme of the present invention, by increase high-speed analog switch and the charging circuit that can change the charging current size in interface circuit, the mode with the software inquiry makes mobile phone can realize multiple function on single face; And the required circuit of the system interface of mobile phone reduces, and the mobile phone external interface reduces, thereby has increased the type selecting scope of handset port device.
Description of drawings
Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of specification, is used from explanation the present invention with embodiments of the invention one, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the structural representation according to the versatile interface circuit of the embodiment of the invention;
Fig. 2 is the hardware circuit diagram according to embodiment of the invention versatile interface circuit;
Fig. 3 is the flow chart according to the versatile interface implementation method of the embodiment of the invention;
Fig. 4 is the detailed process flow chart according to the versatile interface implementation method of the embodiment of the invention;
Fig. 5 meets in the charger of specification requirement of " mobile phone charger and interfacing require and method of testing " (declaration original text) D+ to the short circuit schematic diagram of D-.
Embodiment
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, and be not used in qualification the present invention.
Functional overview
The present invention relates to versatile interface circuit, portable terminal, versatile interface implementation method, by in hardware circuit, increasing high-speed analog switch and the charging circuit that can change the charging current size, with the mode of software inquiry, can realize the function of charging inlet, usb data communication interface or RS232 interface selectively.
According to embodiments of the invention, provide a kind of versatile interface circuit.Fig. 1 is the schematic diagram according to present embodiment versatile interface circuit; As shown in Figure 1, this versatile interface circuit mainly comprises: RS232 circuit 2, USB circuit 4, charging circuit 6, high-speed analog switch 8.Wherein, charging circuit is used to realize the Current Control of portable terminal; High-speed analog switch is connected to charging circuit, and is connected with the USB circuit with the RS232 circuit, is used for switching between RS232 circuit and USB circuit; And high-speed analog switch also is connected with pull down resistor (also can be pull-up resistor).
In the present embodiment, by in interface circuit, increasing high-speed analog switch and the charging circuit that can control portable terminal charging current size, make interface circuit have the hardware configuration of on single face, realizing comprising usb function, RS232 interface function and charging inlet function, therefore, the reduction of portable terminal external interface, the type selecting scope of interface circuit device broadens.
Fig. 2 is according to the hardware circuit diagram of present embodiment versatile interface circuit, describes the preferred embodiments of the present invention in detail below in conjunction with Fig. 2.
As shown in Figure 2, one of main components and parts that are used to realize many kinetic energy circuit of the present invention are high-speed analog switchs, and this high-speed analog switch is used for switching between RS232 circuit and USB circuit; Another primary structure is a charging circuit, can realize the control of operating handset size of current, makes the mobile phone can be in limited current state or the work of maximum charging current state.Mobile phone query software when downloading or calibrate may not normally move, so will connect pull down resistor 20 to high-speed analog switch, guarantee GPIO (General-Purpose IO port by external circuit, general input/output interface) initial condition, thereby the proper communication of RS232 circuit when guaranteeing initial condition.
Preferably, in the hardware circuit of this embodiment, charging circuit comprises charging chip and resistance feedback fraction, the resistance feedback fraction is connected with feedback resistance and metal-oxide-semiconductor, can change the resistance sizes of resistance feedback fraction by the state of metal-oxide-semiconductor, the initial condition of metal-oxide-semiconductor can be conducting according to different charging chips or close, but will guarantee that electric current that mobile phone in this state receives from USB power supply Vbus is less than 500mA.
According to the embodiment of the invention, a kind of portable terminal also is provided, can be mobile phone, PDA etc., this portable terminal comprises above-mentioned versatile interface circuit, realizes the function of charging inlet, USB interface and RS232 interface by high-speed analog switch.
Method embodiment
According to embodiments of the invention, provide a kind of implementation method of versatile interface circuit.Fig. 3 is the flow chart of the versatile interface implementation method of the embodiment of the invention.As shown in Figure 3, the method for present embodiment comprises the steps:
S302: inserting external equipment, and detect the size of external equipment input power supply, is under the situation of predetermined value in the size of importing power supply, and high-speed analog switch is switched to the USB circuit.
S304: check in the USB register whether have the USB device Query Information.
S306-1: under the situation that is checked through the USB device Query Information, keep high-speed analog switch is connected to the USB circuit.
S306-2: check in the given time under the situation less than the USB device Query Information high-speed analog switch to be switched to the RS232 circuit, and use charging circuit to carry out Current Control.
In the present embodiment, based on the versatile interface hardware circuit,, check in the USB register whether have the USB device Query Information, thereby can realize the function of usb function and charging inlet with the method for software inquiry.
Fig. 4 is the detailed process flow chart of the versatile interface implementation method of the embodiment of the invention.Specify the preferred embodiment of charging inlet, USB interface and RS232 interface implementation method below in conjunction with Fig. 4.
The preferred embodiment of charging inlet implementation method
As shown in Figure 4, comprise the steps:
S402: after inserting external equipment, whether the size that detects external equipment input power supply is predetermined value 5V.
In concrete testing process, the detection of 5V input power supply can be finished by the ADC (Analogue Digital Converter, analog-digital converter) of mobile phone inside, also can detect pin by the special charging of mobile phone and carry out; If the latter, flow process of the present invention can be embedded in the central branch as charging flow of charging flow, perhaps can be understood as charging and interrupting causing flow process, selects according to the Rule of judgment in the flow process again.
S404:, then the high-speed power switch is switched to the USB passage if mobile phone can detect the access of 5V power supply.
S406: check the USB register, check whether the USB device Query Information is arranged.
S412:, then high-speed analog switch is switched to the RS232 circuit if check in the given time less than the USB device Query Information.
S414: send inquiry code to the RS232 circuit and carry out the legitimacy verification of external equipment.
In above-mentioned steps, the inquiry code of transmission can be set up on their own by the user.Because in the standard of " mobile phone charger and interfacing require and method of testing " (declaration original text), two signal conductors of standard charging device be short circuit together, as shown in Figure 5, therefore preferably, the user can determine whether the external power supply unit of mobile phone meets the verification requirement by the mode of loopback detection inquiry code.
S416: if verification is unusual, illustrate that then external equipment is illegal, be that external equipment is the charger that does not meet the specification requirement of " mobile phone charger and interfacing require and method of testing " (declaration original text), at this moment, make the limited current state that keeps cell-phone charging, and can feed back to the cellphone subscriber by man-machine interface, the cellphone subscriber can be chosen in and continue charging under the limited current state or pull out charging device.
S418: if verification is correct, illustrate that then external equipment is legal, be that external equipment is the charger that meets the specification requirement of " mobile phone charger and interfacing require and method of testing " (declaration original text), at this moment, open charging flow and pass through GPIO (General-Purpose IO port, general input/output interface) the control metal-oxide-semiconductor changes the resistance sizes of resistance feedback fraction, make mobile phone can use maximum charging current to charge, handset port realizes charging normal function.
The preferred embodiment of USB interface implementation method
As shown in Figure 4, comprise the steps:
S402: after inserting external equipment, whether the size that detects external equipment input power supply is predetermined value 5V.
S404:, then the high-speed power switch is switched to the USB passage if mobile phone can detect the access of 5V power supply.
S406: check the USB register, check whether the USB device Query Information is arranged.
S408: if be checked through the USB device Query Information, keep high-speed analog switch is connected to the USB circuit, enable the USB function by software and carry out usb communication.
S410: keep the restriction of charging current, open charging flow, with the phenomenon that guarantees that mobile phone can not occur cutting off the power supply when the long-time usb communication.
The preferred embodiment of RS232 interface implementation method
As shown in Figure 4, comprise the steps:
S402: after inserting external equipment, whether the size that detects external equipment input power supply is predetermined value 5V.
S420: the size at external device power supply (DPS) is not under the situation of 5V, receives the UART check code from the outside.
S422: under the situation of verification succeeds, high-speed analog switch is set to keep being connected to the RS232 circuit, enables the RS232 function and carries out software debugging, work such as upgrading or calibration.
In addition, after inserting external equipment, thereby also can directly change the software debugging that Interface status is realized mobile phone, work such as upgrading or calibration by EO Engineering Order.
As mentioned above, adopt the implementation method of Multi-featured Mobile Terminal interface circuit of the present invention and various interface thereof, by in hardware circuit, increasing high-speed analog switch and the charging circuit that can change the charging current size, mode with the software inquiry makes mobile phone can realize multiple use on single face; And the required circuit of the system interface of mobile phone reduces, the reduction of mobile phone external interface, the type selecting wide ranges of interface device.
In addition, Multi-featured Mobile Terminal interface provided by the invention has adapted to the requirement of new issue " mobile phone charger and interfacing require and method of testing ", make mobile phone can use various charging devices to carry out safe charging with this interface, comprise standard charging device that meets this standard code and the charger that does not meet this standard code, as computer or the built-in USB A series interfaces of pocket computer.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a versatile interface circuit comprises RS232 circuit and USB circuit, it is characterized in that, described interface circuit also comprises,
Charging circuit is used to realize the Current Control of portable terminal;
High-speed analog switch is connected to described charging circuit, and is connected with the USB circuit with described RS232 circuit, is used for switching between described RS232 circuit and USB circuit;
Wherein, described high-speed analog switch is connected with pull down resistor or pull-up resistor.
2. versatile interface circuit according to claim 1 is characterized in that, described charging circuit comprises:
The feedback resistance part comprises feedback resistance and is connected to the metal-oxide-semiconductor of described feedback resistance, the conducting by described metal-oxide-semiconductor or end the resistance value that changes described feedback resistance part;
Charging chip is connected to power supply, described resistance feedback fraction, described high-speed analog switch, is used to realize charging operations.
3. a portable terminal comprises versatile interface circuit according to claim 1 and 2.
4. a versatile interface implementation method is used interface circuit according to claim 1 and 2, it is characterized in that, comprising:
Inserting external equipment, and detect the size of external equipment input power supply, is under the situation of predetermined value in the size of described input power supply, and described high-speed analog switch is switched to described USB circuit;
Check in the USB register and whether have the USB device Query Information;
Wherein, under the situation that is checked through the USB device Query Information, keep described high-speed analog switch is connected to described USB circuit;
Check in the given time under the situation less than the USB device Query Information, described high-speed analog switch is switched to described RS232 circuit, and use described charging circuit to carry out Current Control.
5. method according to claim 4 is characterized in that, before inserting external equipment, also comprises by controlling described metal-oxide-semiconductor making portable terminal be in the step of restriction current status.
6. method according to claim 5 is characterized in that, described restriction current status is meant that the electric current of described charging circuit control is less than 500mA.
7. claim 4 or 5 described methods is characterized in that, use described charging circuit to carry out Current Control and specifically comprise:
Send inquiry code to the RS232 circuit and carry out the legitimacy verification of external equipment;
Under the legal situation of the described external equipment of verification, control the resistance value that described metal-oxide-semiconductor changes described feedback resistance part, make described charging chip carry out charging operations with maximum charging current.
8. according to claim 4 or 5 described methods, it is characterized in that, further comprise:
Size at described external equipment power supply is not under the situation of predetermined value, receives the UART check code from the outside, and under the situation of verification succeeds, described high-speed analog switch is set to keep being connected to described RS232 circuit.
9. method according to claim 4 is characterized in that described predetermined value is 5V.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008101296642A CN101335535B (en) | 2008-08-05 | 2008-08-05 | Multifunctional interface circuit, mobile terminal, multifunctional interface implementing method |
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| CN2008101296642A CN101335535B (en) | 2008-08-05 | 2008-08-05 | Multifunctional interface circuit, mobile terminal, multifunctional interface implementing method |
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| CN101335535A true CN101335535A (en) | 2008-12-31 |
| CN101335535B CN101335535B (en) | 2013-06-05 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101924808A (en) * | 2010-08-18 | 2010-12-22 | 萨基姆移动电话研发（宁波）有限公司 | Mobile terminal |
| CN101577437B (en) * | 2009-03-27 | 2011-11-16 | 上海华勤通讯技术有限公司 | Nokia charger circuit compatible with CDMA mobile phone and charging method |
| CN102724339A (en) * | 2012-05-29 | 2012-10-10 | 惠州Tcl移动通信有限公司 | UART serial port and USB interface shared circuit and mobile phone |
| CN103135018A (en) * | 2013-01-30 | 2013-06-05 | 上海斐讯数据通信技术有限公司 | Multi-function simulation charging test device |
| WO2015181440A1 (en) * | 2014-05-28 | 2015-12-03 | Nokia Technologies Oy | Baseband pd communication over usb standard a connector |
| 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 |
| CN108605018A (en) * | 2015-12-14 | 2018-09-28 | 克诺尔商用车制动系统有限公司 | The circuit device of changeable line terminal for universal serial bus |
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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 |
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Patent Citations (2)
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101577437B (en) * | 2009-03-27 | 2011-11-16 | 上海华勤通讯技术有限公司 | Nokia charger circuit compatible with CDMA mobile phone and charging method |
| CN101924808A (en) * | 2010-08-18 | 2010-12-22 | 萨基姆移动电话研发（宁波）有限公司 | Mobile terminal |
| CN101924808B (en) * | 2010-08-18 | 2013-10-02 | Tcl通讯（宁波）有限公司 | Mobile terminal |
| CN102724339A (en) * | 2012-05-29 | 2012-10-10 | 惠州Tcl移动通信有限公司 | UART serial port and USB interface shared circuit and mobile phone |
| CN103135018A (en) * | 2013-01-30 | 2013-06-05 | 上海斐讯数据通信技术有限公司 | Multi-function simulation charging test device |
| CN103135018B (en) * | 2013-01-30 | 2017-04-05 | 上海斐讯数据通信技术有限公司 | Multi-functional analog charging measurement device |
| WO2015181440A1 (en) * | 2014-05-28 | 2015-12-03 | Nokia Technologies Oy | Baseband pd communication over usb standard a connector |
| CN106415979A (en) * | 2014-05-28 | 2017-02-15 | 诺基亚技术有限公司 | Baseband PD communication over USB standard A connector |
| US9588560B2 (en) | 2014-05-28 | 2017-03-07 | Nokia Technologies Oy | Baseband PD communication over USB standard a connector |
| 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 |
| CN108605018A (en) * | 2015-12-14 | 2018-09-28 | 克诺尔商用车制动系统有限公司 | The circuit device of changeable line terminal for universal serial bus |
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