CN109921481A - To the OTG equipment and method of supplying power to of communication object power supply when USB is communicated - Google Patents
To the OTG equipment and method of supplying power to of communication object power supply when USB is communicated Download PDFInfo
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- CN109921481A CN109921481A CN201910161904.5A CN201910161904A CN109921481A CN 109921481 A CN109921481 A CN 109921481A CN 201910161904 A CN201910161904 A CN 201910161904A CN 109921481 A CN109921481 A CN 109921481A
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Abstract
To the OTG equipment and method of supplying power to of communication object power supply when being communicated the invention discloses a kind of USB, the OTG equipment includes cpu chip and master slave mode switching circuit, and master slave mode switching circuit includes communication USB interface, power supply control-switching module and the ID controller for connecting the charging interface of external power supply, for connecting external USB data line；The power pins of charging interface are connected by power supply control-switching module with the power pins for communicating USB interface, and power supply control-switching module is used to control the on-off on the road；Cpu chip is connected by ID controller with the ID pin for communicating USB interface, and ID controller is used to switch the master slave mode of OTG equipment.The present invention realizes the dynamic operation that smart phone charging, peripheral apparatus charging, smart phone and peripheral apparatus charge simultaneously, improves the stability of data transmission while realizing that master-slave mode compatibility judges.
Description
Technical field
The present invention relates to a kind of OTG equipment more particularly to a kind of Peripheral Interface electricity for communicating and powering with mobile phone USB
Road, and a kind of method powered while communication is provided.
Background technique
OTG is the abbreviation of On-The-Go, is the technology that developed recently gets up, on December 18th, 2001 is by USB
Implementers Forum is announced, the connection being mainly used between a variety of different equipment or mobile device, carries out data friendship
It changes.Especially Pad, mobile phone, consumer devices.It is a variety of not to change such as digital camera, video camera, printer equipment room
With standard connector, the inconvenience of data exchange between the storage card of up to 7 kinds standards.Start within 2014 or so universal in market.
In the prior art, the equipment for having OTG function judges generally by the state of detection device USB_id pin
Equipment is holotype (USB_id ground connection) or slave pattern (USB_id is in high potential).When as working for holotype, OTG is set
It is standby to provide Vbus power supply for peripheral hardware and work, when working as slave pattern, OTG equipment cutting supply Vbus power supply.The technology
Holotype and slave pattern mutually switch when holding equipment does not connect.Improved mainstream technology is by increasing Vbus monitoring and power supply electricity
Road (Ldo, current limliting Ic) and software cooperation are to realize power switching, in the application ring for needing simply to judge OTG operating mode
Under border, it appears mechanism is complicated and cost improves, and mode is simpler, and only supports master slave mode switching.
Beauty and the convenience that uses of the common mobile device generally for shape, all number of compression interface as far as possible, than
As only remained an interface on mobile phone, iPad, the data ports such as main brand mobile phone such as Huawei, apple and charge port are at present
Same USB port.Therefore under certain specific application scenes, such as smart phone connects external equipment transmitting spy by USB interface
Fixed number according to when, USB interface is occupied, causes smart phone that can not charge in the case.In the low situation of smart phone electricity
Lower there are the risks of smart phone power-off, and there are information to transmit discontinuously, and efficiency of transmission is low, and part action is lost not
Foot.When the data of transmission are extremely important, or need to handle the data of transmission, there is harsh want to transmission stability
It asks, this deficiency may cause the loss of significant data, will be fatal defect.
Summary of the invention
Goal of the invention: in view of the above problems, the present invention proposes the interface circuit and method of supplying power to of a kind of OTG equipment, it can
Realization powers to mobile phone while equipment and mobile phone carry out data communication by USB interface, the stability of improve data transfer.
Technical solution: the technical scheme adopted by the invention is that being set when a kind of USB is communicated to the OTG of communication object power supply
Standby, which includes cpu chip and master slave mode switching circuit, and master slave mode switching circuit includes for connecting outside
The charging interface of power supply, the communication USB interface for connecting external USB data line, power supply control-switching module and ID control
Device；The power pins of charging interface are connected by power supply control-switching module with the power pins for communicating USB interface, power supply control
System-switching module receives the control signal that cpu chip issues, for controlling the output of power supply control-switching module；Cpu chip
It is connected by ID controller with the ID pin of communication USB interface, the input terminal of ID controller receives the ID pin that cpu chip issues
Signal con is controlled, for switching the master slave mode of OTG equipment.
Further, the ID controller includes two NMOS tubes and rechargeable lithium battary；Second NMOS tube NM2's
Source electrode ground connection, grid are the input terminal of ID controller, and the drain electrode of the first NMOS tube NM1 is the output end of ID controller, source
Pole ground connection, grid are connected with the drain electrode of the second NMOS tube NM2；Rechargeable lithium battary is that the grid of the first NMOS tube NM1 mentions
For high level.
Further, the power supply control-switching module uses digital switch chip, and the enable end of chip, which receives, to be come from
The charging enable signal ENA of cpu chip is used for control switch on-off.
Further, which further includes the encrypting module for data encryption, and encrypting module is connected with cpu chip.
The equipment further includes interactive display, the instruction for user to cpu chip input " powering to communication object ".
The invention also provides a kind of methods to be charged in communication to communication object using above-mentioned OTG equipment, including with
Lower step:
(1) the communication USB interface of the OTG equipment is connected by data line with communication object, and external power supply access OTG is set
Standby charging interface.
(2) cpu chip control ID pin control signal con is high level, and OTG equipment is made to be in holotype.A kind of control
Method is: it is low level by ID pin control signal con default setting, when cpu chip detects external power supply access, and CPU
Chip controls ID pin control signal con becomes high level.Another control method is: the ID pin control of cpu chip output
Signal con default setting is low level；When cpu chip detect external power supply access, and receive " to communication object power "
When instruction, cpu chip control ID pin control signal con becomes high level；When cpu chip detect external power supply access, but
When not receiving the instruction of " powering to communication object ", ID pin control signal con is constant, is low level, and OTG equipment is logical at this time
News object is in holotype, is still powered at this time by communication object to OTG equipment.
(3) cpu chip control power supply control-switching module conducting, OTG equipment are to start to supply external communication object
Electricity.Charging enable signal ENA is defaulted as low level, and when ID pin control signal con becomes high level, cpu chip control is filled
Electric enable signal ENA becomes high level.
Optionally, the communication object includes mobile phone or tablet computer.
The utility model has the advantages that compared with prior art, the present invention having the advantage that the 1, present invention by building special circuit
Structure is arranged communication interface and individual charging interface in OTG equipment end, input and the cooperation of charging interface is detected by CPU
CPU inputs ID pin and controls signal, controls the supply of VBUS power supply, and then realizes smart phone and OTG equipment under different situations
The switching at runtime of master slave mode not only ensure that normal usb data communication, but also realize the Charge Management to mobile phone；2, of the invention
While realizing that master-slave mode is compatible and judge, cooperate the property of simple component, realization smart phone with it is external
The supply of equipment working power is, it can be achieved that smart phone charging, OTG equipment charge, smart phone and OTG are set under equipment master slave mode
The dynamic operation of standby charging simultaneously, mode is complete, easy to use；3, the circuit uses simple component, and it is real to save power supply
Existing departmental cost；4, a chargeable lithium ion battery is arranged in interface circuit, is on the one hand exported high level and is made control electricity
Road conducting, on the other hand improves equipment dependability, guarantees that product normally starts.
Detailed description of the invention
Fig. 1 is system structure and OTG equipment internal structure topological diagram of the invention；
Fig. 2 is master slave mode switching circuit figure of the invention；
Fig. 3 is power source path schematic diagram under the conditions of state 1；
Fig. 4 is power source path schematic diagram under the conditions of state 2；
Fig. 5 is power source path schematic diagram under the conditions of state 3.
Specific embodiment
Further description of the technical solution of the present invention with reference to the accompanying drawings and examples.
System structure and OTG equipment internal structure topological diagram of the invention is as shown in Figure 1.Communication object includes mobile phone peace
Plate computer.In this example, use smart phone as communication object, it further includes for counting that OTG equipment, which is a kind of data encryption equipment,
According to the encrypting module of encryption, encrypting module is connected with cpu chip.The equipment also has interactive display, is used for user to CPU
The instruction of chip input " powering to communication object ".
The smart phone and its external OTG equipment for supporting OTG function carry out USB communication, and the two is connected by data line.
OTG equipment includes cpu chip and master slave mode switching circuit.The inside of OTG equipment is arranged in master slave mode switching circuit, including
Charging interface 1, communication USB interface 2, power supply (5V output) control-switching module and ID controller.Charging interface 1 is in this example
One USB interface, data communication lead and ID lead do not use, and power supply lead wire passes through DC-to-dc converter (DC/DC)
It is connected with cpu chip, when the interface plug-in Shi Kewei OTG device is powered.The power pins of charging interface 1 pass through power supply control-
Switching module is connected with the power pins of communication USB interface 2, and power supply control-switching module is using digital switch chip, originally
The digital switch chip model used in example is Sip32510DT-T1-GE3.The enable end of chip is received to be sent from cpu chip
Charging enable signal ENA, for controlling its on-off.Cpu chip passes through ID controller and the ID pin phase for communicating USB interface 2
Even, the input terminal of ID controller receives the ID pin from cpu chip and controls signal con, for switch mobile phone and OTG equipment
Master slave mode.Voltage signal VBUS, ID pin control signal con of the power pins of charging interface 1, charging enable signal in figure
ENA and usb data signal DATA is the input or output signal of equipment end cpu chip, to detect, control and communicate
With.
Master slave mode switching circuit is as shown in Figure 2.The ID controller includes two NMOS tubes and chargeable lithium electricity
Pond；The source electrode of second NMOS tube NM2 is grounded, and grid is the input terminal of ID controller.The drain electrode of first NMOS tube NM1 is ID control
The output end of device processed is connected with communication USB interface ID pin, source electrode ground connection, the drain electrode phase of grid and the second NMOS tube NM2
Even；Rechargeable lithium battary provides high level for the grid of the first NMOS tube NM1.
Using the above-mentioned OTG equipment with master slave mode switching circuit, mobile phone is powered while data communication
Method, principle is: (1) under normal circumstances, the ID pin voltage that USB port is docked with mobile phone is dragged down, so that mobile phone connects OTG
Holotype can be worked in after equipment, powered to OTG equipment, and carry out usb communication；(2) there is the case where charge power supply access
Under, when smart phone has charge requirement, the CPU of equipment end draws high the OTG_ID signal of communication USB interface, so that at mobile phone USB
In slave pattern, OTG equipment is in holotype, can charge and communicate.Mobile phone and OTG equipment are passed through into USB data line according to Fig. 1
It is connected, corresponding different conditions are as follows:
State 1:
For charging interface without input, ID pin controls signal con input low level, and mobile phone is the power supply of OTG equipment.Cell phone apparatus
When in holotype, OTG equipment is in slave pattern.
When mobile phone electricity abundance, the charging interface of OTG equipment does not access external power supply.Master slave mode switching circuit at this time
The voltage of middle chargeable button cell is 3V, and the pole G of the first NMOS tube MN1 is made to be in high level, and metal-oxide-semiconductor circuit is connected, USB's
ID pin ground connection, voltage are in low level.When the OTG equipment connects smart phone, since the ID pin voltage of USB interface connects
Earth signal is in low level, therefore smart phone is in holotype, powers to OTG equipment, and carry out usb data communication, at this time
Power source path is as shown in Figure 3.
State 2:
Charging interface has input, and ID pin controls signal con signal input low level, and mobile phone and charging USB are simultaneously OTG
Equipment power supply.Cell phone apparatus is in holotype.
After charging interface connects charger, the power pins of the USB that charges export 5V voltage, and by diode directly to
The power supply of OTG equipment is still low level, then smart phone is still in master if the signal con signal of ID pin control at this time does not change
Mode, charging enable signal ENA are low level, and external power supply and smart phone give OTG equipment to power simultaneously, power supply road at this time
Diameter is as shown in Figure 4.
State 3:
Charging interface has input, and ID pin controls signal con input high level, and OTG equipment is mobile phone power supply.Cell phone apparatus
In slave pattern, OTG equipment is in holotype.
External power supply accesses the charging interface of OTG equipment, and " is filled to cpu chip input to mobile phone by interaction display screen
The instruction of electricity ", output ID pin control signal con signal becomes high level, the second NMOS tube NM2 after cpu chip receives instruction
The pole G level be raised, the second NMOS tube NM2 conducting, the first NMOS tube MN1 grounded-grid be low level, the first NMOS tube is not
Logical, the ID pin voltage for communicating USB interface is hanging, and OTG_ID signal is made to be in high potential, and mobile phone USB is switched to slave pattern, if
The USB that standby end CPU switches oneself is main operating mode.Then, CPU makes load switch in the enabled end the EN input high level that charges
Conducting, OTG equipment are mobile phone power supply, and power source path is as shown in Figure 5 at this time.
The step of interaction display screen input instruction is omitted in another control program, retrieves external power supply in cpu chip
ID pin control signal con and charging enable signal ENA are just controlled when access becomes high level, and OTG equipment mobile phone is made to power.
Above-mentioned state 1 and state 3 are only existed in this scheme, and state 2 is not present.
Claims (10)
- To the OTG equipment of communication object power supply when 1. a kind of USB is communicated, it is characterised in that: the OTG equipment include cpu chip with And master slave mode switching circuit, master slave mode switching circuit include for connecting the charging interface of external power supply, for outside connecting Communication USB interface, power supply control-switching module and the ID controller of portion's USB data line；The power pins of charging interface pass through Power supply control-switching module is connected with the power pins of communication USB interface, and power supply control-switching module, which receives, comes from cpu chip Control signal, for controlling power supply control-switching module on-off；Cpu chip is by ID controller and communicates USB interface ID pin is connected, and the input terminal of ID controller receives the ID pin that cpu chip issues and controls signal (con), sets for switching OTG Standby master slave mode.
- To the OTG equipment of communication object power supply when 2. USB according to claim 1 is communicated, it is characterised in that: the ID control Device processed includes two NMOS tubes and rechargeable lithium battary；The source electrode of second NMOS tube (NM2) is grounded, and grid is ID control The input terminal of device, the drain electrode of the first NMOS tube (NM1) are the output end of ID controller, source electrode ground connection, grid and second The drain electrode of NMOS tube (NM2) is connected；Rechargeable lithium battary provides high level for the grid of the first NMOS tube (NM1).
- To the OTG equipment of communication object power supply when 3. USB according to claim 1 is communicated, it is characterised in that: the power supply Control-switching module uses digital switch chip, and the enable end of chip receives the charging enable signal (ENA) from cpu chip, For control switch on-off.
- To the OTG equipment of communication object power supply when 4. USB according to claim 1 is communicated, it is characterised in that: the equipment is also Instruction including interactive display, for from user to cpu chip input " powering to communication object ".
- To the OTG equipment of communication object power supply when 5. USB according to claim 1 is communicated, it is characterised in that: the OTG is set Standby further includes for the data encryption module to data encryption, and encrypting module is connected with cpu chip.
- 6. a kind of method to be charged in communication to communication object using the described in any item OTG equipment of claim 1-5, special Sign is: the following steps are included:(1) the communication USB interface of the OTG equipment is connected by data line with communication object, and external power supply accesses OTG equipment Charging interface；(2) cpu chip control ID pin control signal (con) is high level, and OTG equipment is made to be in holotype；(3) cpu chip control power supply control-switching module conducting, OTG equipment are to start to power to external communication object.
- 7. the method according to claim 6 to be charged in communication to communication object using OTG equipment, it is characterised in that: ID pin control signal (con) default setting of cpu chip output is low level；When cpu chip detects that external power supply accesses When, cpu chip control ID pin control signal (con) becomes high level.
- 8. the method according to claim 6 to be charged in communication to communication object using OTG equipment, it is characterised in that: ID pin control signal (con) of cpu chip output is defaulted as low level；When cpu chip detects external power supply access, and receipts To " to communication object power " instruction when, cpu chip control ID pin control signal (con) become high level；Work as cpu chip When detecting that external power supply accesses, but not receiving the instruction of " powering to communication object ", it is low that ID pin, which controls signal (con) still, Level, the communication object of OTG equipment is in holotype at this time, is powered by communication object to OTG equipment.
- 9. the method according to claim 6 to be charged in communication to communication object using OTG equipment, it is characterised in that: Charging enable signal (ENA) is defaulted as low level, and when ID pin control signal (con) becomes high level, cpu chip control is filled Electric enable signal (ENA) becomes high level.
- 10. the method according to claim 6 to be charged in communication to communication object using OTG equipment, it is characterised in that: The communication object includes mobile phone or tablet computer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910161904.5A CN109921481A (en) | 2019-03-04 | 2019-03-04 | To the OTG equipment and method of supplying power to of communication object power supply when USB is communicated |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910161904.5A CN109921481A (en) | 2019-03-04 | 2019-03-04 | To the OTG equipment and method of supplying power to of communication object power supply when USB is communicated |
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| CN109921481A true CN109921481A (en) | 2019-06-21 |
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| CN201910161904.5A Pending CN109921481A (en) | 2019-03-04 | 2019-03-04 | To the OTG equipment and method of supplying power to of communication object power supply when USB is communicated |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110460134A (en) * | 2019-09-06 | 2019-11-15 | 深圳六滴科技有限公司 | A kind of charging switching circuit for panorama camera |
| CN110676913A (en) * | 2019-11-11 | 2020-01-10 | Oppo广东移动通信有限公司 | Charging method, terminal, conversion device and storage medium |
| CN111969686A (en) * | 2020-08-18 | 2020-11-20 | 上海乐今通信技术有限公司 | Mobile terminal for concurrent USB OTG and charging and implementation method |
| CN112089096A (en) * | 2020-10-09 | 2020-12-18 | 西安稳先半导体科技有限责任公司 | Electronic cigarette, and cigarette cartridge and safety circuit used for electronic cigarette |
| CN113300859A (en) * | 2021-05-14 | 2021-08-24 | 深圳市绘王动漫科技有限公司 | Data forwarding apparatus and data forwarding method thereof |
| CN113507538A (en) * | 2021-09-02 | 2021-10-15 | 深圳市微健科技有限公司 | Audio accessory capable of automatically being compatible with charging and audio transmission of apple android device |
| CN114356060A (en) * | 2020-10-14 | 2022-04-15 | 全汉企业股份有限公司 | Master-slave interchange type power supply device, power supply method and host |
| CN114519015A (en) * | 2022-02-23 | 2022-05-20 | 深圳市智微智能科技股份有限公司 | Android-based method, device, equipment and medium for switching Tepy-C to OTG mode |
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| CN113300859A (en) * | 2021-05-14 | 2021-08-24 | 深圳市绘王动漫科技有限公司 | Data forwarding apparatus and data forwarding method thereof |
| CN113507538A (en) * | 2021-09-02 | 2021-10-15 | 深圳市微健科技有限公司 | Audio accessory capable of automatically being compatible with charging and audio transmission of apple android device |
| CN114519015A (en) * | 2022-02-23 | 2022-05-20 | 深圳市智微智能科技股份有限公司 | Android-based method, device, equipment and medium for switching Tepy-C to OTG mode |
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Application publication date: 20190621 |