CN101901201A - Method and device for realizing USB OTG function on electronic equipment - Google Patents
Method and device for realizing USB OTG function on electronic equipment Download PDFInfo
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Abstract
The invention discloses a method and a device for realizing USB OTG function on electronic equipment. When external electronic equipment is connected with a USB OTG connecting unit, each pin state of the USB OTG connecting unit triggers a main processing unit to open or close a USB physical layer module. When the USB physical layer module is opened, the USB physical layer module executes identification and configuration on the external electronic equipment, and notifies the main processing unit of executing power supply operation. By designing the external electronic equipment identification flow and the detection closing flow, the method and the device for realizing the USB OTG function can identify a charger, USB master equipment and USB slave equipment, and can reasonably close the USB physical layer module inside the main processing unit when the external electronic equipment is not plugged. The device overcomes the defects of the conventional USB OTG schemes, and has the characteristics of simple control, no occupancy of a system bus, and low power consumption so as to prolong the standby time.
Description
Technical field
The present invention relates to electronic equipment data interface techniques field, relate in particular to a kind of method and apparatus of on electronic equipment, realizing USB OTG (USB On-The-Go) function.
Background technology
Along with science and technology development, multimedia application is increasingly extensive, and data storage capacity constantly increases, and the requirement of transfer rate is also improving constantly.In order to satisfy PDA (Personal Digital Assistant, personal digital assistant), electronic equipment and PC (Personal Computer such as mobile phone, digital camera, printer, PC) between the machine, perhaps realize the requirement of high speed data transfer between the electronic equipment, increasing electronic product has USB2.0 and USB OTG function.
USB (Universal Serial Bus, USB (universal serial bus)) is one of the main standard of high speed data transfer, have and support hot-swappable, easy to carry, interface to unify, can connect advantages such as a plurality of electronic equipments, be widely used in consumption electronic product and communications electronics product scope.The high-speed transfer speed of USB2.0 standard reaches 480Mbps.In the usb protocol, two USB device will be carried out data transmission, and one of them must be USB main equipment USB Host, and another is USB slave unit USB Device, and USB Host is responsible for the initialization and the transmission control of data transmission.The USB2.0 interface has 4 pins, comprises power pins VBUS, grounding pin GND, differential signal pin DP and DM, and the USB main equipment provides 5V power supply by power pins VBUS to the USB slave unit.Up to the present, most electronic equipments or can only be as USB Host, as PC, or can only be as USB Device, as the MP3 player.
USB OTG standard is by USB-IF (USB Implementers Forum, USB implementer forum) announces Dec 18 calendar year 2001, on the basis of complete compatible USB2.0 standard, allow electronic equipment both to can be used as USB Host work, can be used as USB Device work again, and certain USB Host detectability can be provided, support HNP (Host Negotiation Protocol, main frame circular order agreement) and SRP (SessionRequest Protocol, session request agreement).USB OTG makes USB device break away from the restriction of original client/server, has realized end-to-end transmission mode, has expanded the application of USB.Electronic equipment with USB OTG function has increased the 5th pin--ID, is used to discern different equipment, and interface uses novel mini-AB socket, mini-A plug and mini-B plug.ID pin ground connection in the mini-A plug, the ID pin in the mini-B plug is floating empty.When the electronic equipment with USB OTG function detects ID pin ground connection, that expression inserts is USB Device, with the local terminal electronic configurations is USB Host, and when the electronic equipment with USBOTG function detects the floating sky of ID pin, that expression inserts is USB Host, is USB Device with the local terminal electronic configurations.
At present, the solution of realization USB OTG function mainly contains following three kinds:
First kind of scheme, the device of realizing USB OTG function is by the USB master controller that separates, USB slave controller, compositions such as USB otg controller, USB transceiver and charge pump.The shortcoming of this scheme is that control is complicated, and interface is not general, the cost height, and PCB (Printed circuit board, printed circuit board (PCB)) area is big.
Second kind of scheme, the device of realizing USB OTG function are made up of processor, integration USB OTG control chip and the charge pump with USB OTG functional module not as shown in Figure 1.This is a USB OTG scheme common in a kind of mobile phone terminal.Wherein, integration USB OTG control chip is integrated USB master controller, USB slave controller, transceiver and otg controller circuit, integration USB OTG control chip links to each other with processor by ULPI (UTMI+low-pin interface, low pin count interface) bus.The shortcoming of this scheme is to take processor bus, reduces system performance, and present most processor chips integrated USB master controller, USB slave controller, therefore, caused and repeated to be provided with, device resource that will the master and slave controller of waste one cover USB.
The third scheme realizes that device such as Fig. 2 of USB OTG function shows, is made up of processor, a plurality of analog switch and the charge pump of the master and slave controller of band USB.Wherein, a plurality of analog switches are used to control the last pull down resistor of USB interface, and are perhaps unsettled, to realize the configuration of USB OTG.The shortcoming of this scheme be control comparatively complicated, discrete device is many, the PCB area is big.
In addition, these three kinds of USB OTG schemes all are to detect the type of inserting USB device in real time by USB ID detecting device, this just need open the power supply of USB OTG functional module and the USB ID detecting device in the USB OTG functional module always, and no matter whether insert USB device.This will increase power consumption for making battery-powered electronic equipment, shorten the stand-by time of electronic equipment.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of method and apparatus of realizing USB OTG function on electronic equipment, the power consumption that does not take the system bus resource and save electronic equipment.
The technical solution used in the present invention is that the described device of realizing USB OTG function on electronic equipment comprises:
USB OTG interface unit links to each other with USB physical layer block corresponding pin, is used to connect external connected electronic equipment;
The USB physical layer block is arranged in Main Processor Unit, is used for external electronic equipment is discerned, and the local terminal electronic equipment is configured, and the notice Main Processor Unit is carried out powered operation;
Power Management Unit links to each other with the power pins of USB OTG interface unit, is used for sending look-at-me to Main Processor Unit when power pins has operating voltage;
Main Processor Unit, link to each other with Power Management Unit on the one hand, open the USB physical layer block after being used to receive look-at-me, the first general input/output port by the acquiescence input high level links to each other with the identification pin of USB OTG interface unit on the other hand, be used for when detecting the first general input/output port current potential and be pulled down to earthing potential, opening the USB physical layer block.
Further, this device comprises power supply unit, is connected with Main Processor Unit by the second general input/output port, is used for being under the control of Main Processor Unit the external connected electronic power devices;
Described Main Processor Unit is further used for controlling Power Management Unit and utilizes the power supply unit charging of external connected electronic device power supply (DPS) for the local terminal electronic equipment.
When further, opening the USB physical layer block by the operating voltage triggering Main Processor Unit of power pins:
Described USB physical layer block, be used for external electronic equipment being judged according to the state of positive differential signal pins and minus tolerance sub-signal pin, if positive differential signal pins and minus tolerance sub-signal pin short circuit, then notifying Main Processor Unit to carry out the charger charging flow is the power supply unit charging; If positive differential signal pins and minus tolerance sub-signal pin be short circuit not, is the USB slave unit with the local terminal electronic configurations then, notifying Main Processor Unit to carry out the USB charging flow simultaneously is the power supply unit charging;
When dragging down the first general input/output port current potential to earthing potential triggering Main Processor Unit unlatching USB physical layer block by the identification pin:
Described USB physical layer block, being used for the local terminal electronic configurations is the USB main equipment, notifies Main Processor Unit control power supply unit to give the external connected electronic power devices simultaneously.
Further, described USB physical layer block is used for, when the operating voltage that detects USB OTG interface unit power pins disappears, perhaps positive differential signal pins and minus tolerance sub-signal pin short circuit, perhaps discerning pin is become when unsettled by ground connection, controller to Main Processor Unit sends shutdown signal, and the controller of Main Processor Unit after receiving shutdown signal cuts out the USB physical layer block.
Further, described power supply unit comprises charge pump and battery, Power Management Unit links to each other with battery, the second general input/output port of Main Processor Unit links to each other with the Enable Pin of charge pump, battery links to each other with the input end of charge pump, and the electric charge delivery side of pump links to each other with the power pins of USB OTG interface unit;
When the external connected electronic equipment that connects USB OTG interface unit was charger or USB main equipment, the operating voltage of external connected electronic equipment is the input battery after the Power Management Unit conversion;
When the external connected electronic equipment that connects USB OTG interface unit was the USB slave unit, Main Processor Unit was opened charge pump, utilizes battery power to be the external connected electronic power devices.
Optionally, described electric charge delivery side of pump links to each other by the power pins of diode with USB OTG interface unit.
The present invention also provides a kind of and realizes comprising the method for USB OTG function on electronic equipment based on device noted earlier:
When external connected electronic equipment inserted or extracts USB OTG linkage unit, the pin state of USB OTG linkage unit triggered Main Processor Unit and opens or close the USB physical layer block;
The USB physical layer block is discerned external electronic equipment when opening, and the local terminal electronic equipment is configured, and the notice Main Processor Unit is carried out powered operation.
Further, the detailed process of the pin state of described USB OTG linkage unit triggering Main Processor Unit unlatching USB physical layer block comprises:
If USB OTG interface unit power pins has operating voltage, then trigger Power Management Unit generation look-at-me and send to Main Processor Unit, Main Processor Unit is opened the USB physical layer block; Perhaps,
If USB OTG interface unit identification pin has the earthing potential input, then produce look-at-me and send to Main Processor Unit by the first general input/output port current potential that drags down the acquiescence input high level, Main Processor Unit is opened the USB physical layer block.
Further, described USB physical layer block is carried out identification to external electronic equipment when opening, and the local terminal electronic equipment is configured, and the detailed process of notice Main Processor Unit execution powered operation comprises:
Whether the power pins of step 1, detection USB OTG interface unit has operating voltage, if power pins has operating voltage, then execution in step two; If power pins does not have operating voltage, then execution in step three;
Whether step 2, the positive differential signal pins that detects USB OTG interface unit and minus tolerance sub-signal pin short circuit, if, then notifying Main Processor Unit to carry out the charger charging flow is the power supply unit charging, otherwise with the local terminal electronic configurations is the USB slave unit, and notifying Main Processor Unit to carry out the USB charging flow simultaneously is the power supply unit charging;
Step 3, when the identification pin that detects USB OTG interface unit has the earthing potential input, be the USB main equipment with the local terminal electronic configurations, notify Main Processor Unit control power supply unit to give the external connected electronic power devices simultaneously.
Further, each pin state of described USB OTG linkage unit triggers Main Processor Unit and closes the detailed process of USB physical layer block and comprise:
The operating voltage that detects the power pins of USB OTG interface unit when the USB physical layer block disappears, perhaps positive differential signal pins and minus tolerance sub-signal pin short circuit, perhaps discerning pin is become when unsettled by ground connection, controller to Main Processor Unit sends shutdown signal, and the controller of Main Processor Unit after receiving shutdown signal cuts out the USB physical layer block.
Adopt technique scheme, the present invention has following advantage at least:
The method and apparatus of on electronic equipment, realizing USB OTG function of the present invention, when external connected electronic equipment links to each other with USB OTG linkage unit, each pin state of USB OTG linkage unit triggers Main Processor Unit and opens or close the USB physical layer block, the USB physical layer block is when opening, external electronic equipment is carried out identification and configuration, and the notice Main Processor Unit is carried out powered operation.Adopt the USB interface electronic equipment of technical solution of the present invention can be directly and USB master transmissions data, also can be directly and the USB slave unit transmit data.The present invention not only can discern charger, USB main equipment and USB slave unit by the identification process and the detection closing flow path of design to external electronic equipment.And when not inserting external connected electronic equipment, rationally close the USB physical layer block in the Main Processor Unit.This device has overcome the shortcoming of USB OTG scheme in the past, has control simply, does not take system bus, saves the characteristics of power consumption with prolongs standby time.
Description of drawings
Fig. 1 is second kind of USB OTG solution synoptic diagram in the prior art;
Fig. 2 is the third USB OTG solution synoptic diagram in the prior art;
Fig. 3 is that the described device of USB OTG function of realizing on mobile phone terminal of first embodiment of the invention is formed synoptic diagram;
Fig. 4 triggers the process flow diagram of opening USB PHY module when inserting charger or USB main equipment in the USB mini-AB socket in the first embodiment of the invention;
Fig. 5 triggers the process flow diagram of opening USB PHY module when inserting the USB slave unit in the USB mini-AB socket in the first embodiment of the invention;
Fig. 6 is the processing flow chart after USB PHY module starts in the first embodiment of the invention;
Fig. 7 is second embodiment of the invention realizes USB OTG function on mobile phone terminal a device composition synoptic diagram.
Embodiment
Reach technological means and the effect that predetermined purpose is taked for further setting forth the present invention, below in conjunction with accompanying drawing and preferred embodiment, to the described method and apparatus of on electronic equipment, realizing USB OTG function that the present invention proposes, describe in detail as after.
The smart mobile phone development in recent years is swift and violent, except possessing basic cell-phone function, also have functions such as high speed data transfer, Internet, WIFI (Wireless Fidelity, Wireless Fidelity), GPS (Global PositioningSystem, GPS), shooting, multimedia.But the smart mobile phone on the market is that the USB main equipment carries out data transmission as USB slave unit and PC when data transmission basically, if desired with other USB slave unit such as swap datas such as USB flash disks, then must be by the PC transfer.Therefore the following concrete embodiment that sets forth of the present invention all is introduced emphatically as electronic equipment with mobile phone.The primary processor of mobile phone is a baseband processing chip, and the primary processor of other electronic equipments may be different accordingly, but its basic functions with in the present invention for realizing that the required control action that plays of USB OTG function all is identical, therefore, those skilled in the art by read the embodiment part with mobile phone terminal as electronic equipment for example, be that other electronic equipments with USB interface that can infer this area also can adopt technical scheme of the present invention to implement.
First embodiment of the invention; as shown in Figure 3; a kind of device of realizing USB OTG function on mobile phone terminal comprises USB mini-AB socket, ESD (Electro-Static Discharge, static discharge) protection device, power management chip, baseband processing chip, battery and charge pump.
USB mini-AB socket is used to connect external charger or the electronic equipment with USB interface, comprises 5 pin: power pins VBUS, positive differential signal pins DP, minus tolerance sub-signal pin DM, identification pin ID and grounding pin GND.Wherein, VBUS, DP, DM and ID all are connected the esd protection device, prevent the static damage baseband processing chip, connect with the corresponding pin of USB PHY (PhysicalLayer, the Physical layer) module of baseband processing chip simultaneously.USB PHY module is supported USB2.0 and USBOTG.As the input of power management chip, the ID pin is connected to the first general input/output port GPIO1 of baseband processing chip to the VBUS pin simultaneously simultaneously.Draw high level in the first general input/output port GPIO1 acquiescence input, and have the function that low level is waken baseband processing chip up.
Power management chip and baseband processing chip interactive information, power management chip can adopt the MAX8903x family chip of Maxim company or the PM7540 of Qualcomm company, PM8028, chips such as PM8058, baseband processing chip can adopt the MSM72x7 of Qualcomm company, QSD8x50, the PXA30x of MSM7x30 or Marvell company, PXA31x, chips such as PX32x.The MAX8903B chip that adopts Maxim company when present embodiment is during as power management chip, and the connected mode of power management chip and baseband processing chip and act on as shown in table 1ly needs 3 lines altogether.
The connection relational table of table 1 power management chip and baseband processing chip
And utilize the electric energy of battery to provide required working power to baseband processing chip.Battery can also be powered to power management chip and charge pump, and when the external connected electronic device power supply (DPS), outside power supply also can be by charging the battery after the power management chip conversion.What the second general input/output port GPIO2 of baseband processing chip was connected to charge pump enables control input end EN, the second general input/output port GPIO2 acquiescence output low level.When the second general input/output port GPIO2 is low level, close charge pump; When the second general input/output port GPIO2 is high level, enable charge pump output terminal OUT output 5V voltage.The output of charge pump is connected to the VBUS pin of USB mini-AB socket.When USB mini-AB socket does not insert any external connected electronic equipment, battery is as the power supply of mobile phone, and baseband processing chip can not opened the USBPHY module, draws in the first general input/output port GPIO1 input, the second general input/output port GPIO2 output low level is promptly closed charge pump.
Based on described device, realize that on mobile phone terminal the detailed operation process of USB OTG function is as follows in the present embodiment:
The flow process of triggering unlatching USB PHY module is as shown in Figure 4 when inserting charger or USB main equipment in the USB mini-AB socket:
Step a1, charger or USB main equipment insert USB mini-AB socket, provide 5V operating voltage by the VBUS pin to device.
Step a2, power management chip detect the 5V operating voltage of VBUS pin, trigger look-at-me, then with this look-at-me notice baseband processing chip.
Step a3, baseband processing chip open USB PHY module after receiving look-at-me.
The flow process of triggering unlatching USB PHY module is as shown in Figure 5 when inserting the USB slave unit in the USB mini-AB socket:
Step b1, USB slave unit insert USB mini-AB socket, because the ID pin ground connection of USB slave unit, the input of the first general input/output port GPIO1 becomes low level by high level, trigger and interrupt;
Step b2, the baseband processing chip that is in sleep pattern then is waken up, and opens USB PHY module then.
Treatment scheme after USB PHY module starts is as shown in Figure 6:
Step S101, whether the VBUS pin that USB PHY module detects USB OTG interface unit has operating voltage, as if the VBUS pin operating voltage is arranged, then execution in step S102; There is not operating voltage as if the VBUS pin, then execution in step S107;
Step S102, USB PHY module detects whether short circuit of the DP pin of USB OTG interface unit and DM pin, if DP pin and DM pin short circuit, what then expression was inserted is charger, jump procedure S103; If DP pin and DM pin be short circuit not, what then expression was inserted is the USB main equipment, jump procedure S105.
Step S103, USB PHY module notice baseband processing unit is carried out the charger charging flow, is promptly charged the battery to the mobile phone power supply and by power management chip by the VBUS pin by charger.Simultaneously, the USBPHY module sends shutdown signal to the controller of baseband processing chip.
Step S104 after the controller of baseband processing chip is received shutdown signal, closes USB PHY module, and flow process finishes.
Step S105, USB PHY module is the USB slave unit with the local terminal electronic configurations, notifies baseband processing unit to carry out the USB charging flow simultaneously, is promptly charged the battery to the mobile phone power supply and by power management chip by the VBUS pin.
The two the difference of charger charging and USB charging flow is that charging current is different, and the charging current that USB main equipment maximum can provide is 500mA, and the charging current of charger is generally bigger, to reduce the duration of charging.In both cases, the setting of the first general input/output port GPIO1 and the second general input/output port GPIO2 remains unchanged, and promptly the first general input/output port GPIO1 still imports and draws high level, the second general input/output port GPIO2 output low level.
Step S106, when USB PHY module can detect the operating voltage disappearance of 5V on the VBUS pin, show that the USB main equipment extracts from USB mini-AB socket, this moment, the controller to the base band control chip sent shutdown signal, and the controller of base band control chip after receiving shutdown signal cuts out USB PHY module.
Step S107, when the ID pin that detects USB OTG interface unit has the earthing potential input, the local terminal mobile phone is configured to the USB main equipment, notify baseband processing unit control charge pump and battery to give the external connected electronic power devices simultaneously, be that baseband processing unit is provided with the second general input/output port GPIO2 output high level, enable charge pump and 5V is provided output for the external USB slave unit.
Step S108, become unsettled by ground connection when USB PHY module detects the ID pin, show that the USB slave unit extracts from USB mini-AB socket, this moment, the controller to the base band control chip sent shutdown signal, and the controller of base band control chip after receiving shutdown signal cuts out USB PHY module.
More than be the USB OTG device that is used for mobile phone terminal in the present embodiment, realize the data transmission of mobile phone terminal and circumscribed USB equipment end, can not only identify charger, USB main equipment and USB slave unit, also when not inserting equipment, rationally close the USB modular circuit.It is simple to have control, does not take system bus, saves the characteristics of power consumption.
Second embodiment of the invention, as shown in Figure 7, a kind of method and apparatus of on mobile phone terminal, realizing USB OTG function, roughly the same with first embodiment, difference is, the electric charge delivery side of pump links to each other with the VBUS pin of USB mini-AB socket by a schottky diode in the described device of present embodiment, and its effect is to prevent when closing charge pump, and the electric current of VBUS pin pours in down a chimney charge pump.
In addition, present embodiment adopts the PM7540 chip of Qualcomm company as power management chip, be connected with the 3rd general input/output port GPIO3 of baseband processing chip by SSBI (Single-wire Serial Bus Interface, single serial bus interface).By the two-way connecting line of this root, finish the control of baseband processing chip to power management chip, comprise the charging current that external charge device and circumscribed USB main equipment are set.
A kind of method and apparatus of USB OTG function of realizing on electronic equipment of the present invention's design is supported USB2.0 OTG.Device of the present invention can be directly and external USB master transmissions data, also can be directly transmits data with external USB slave unit.By designing apparatus identification and testing process, not only can discern charger, USB Host and USB Device.And when not inserting equipment, rationally close the USB modular circuit.This device has overcome the shortcoming of USB OTG scheme in the past, has control simply, does not take system bus, saves the characteristics of power consumption with prolongs standby time.
By the explanation of embodiment, should be to reach technological means and the effect that predetermined purpose takes to be able to more deeply and concrete understanding to the present invention, yet appended diagram only provide with reference to the usefulness of explanation, be not to be used for the present invention is limited.
Claims (10)
1. a device of realizing USB OTG (On-The-Go) function on electronic equipment is characterized in that, comprising:
USB OTG interface unit links to each other with USB physical layer block corresponding pin, is used to connect external connected electronic equipment;
The USB physical layer block is arranged in Main Processor Unit, is used for external electronic equipment is discerned, and the local terminal electronic equipment is configured, and the notice Main Processor Unit is carried out powered operation;
Power Management Unit links to each other with the power pins of USB OTG interface unit, is used for sending look-at-me to Main Processor Unit when power pins has operating voltage;
Main Processor Unit, link to each other with Power Management Unit on the one hand, open the USB physical layer block after being used to receive look-at-me, the first general input/output port by the acquiescence input high level links to each other with the identification pin of USB OTG interface unit on the other hand, be used for when detecting the first general input/output port current potential and be pulled down to earthing potential, opening the USB physical layer block.
2. according to the described device of on electronic equipment, realizing USB OTG function of claim 1, it is characterized in that, further comprise power supply unit, be connected with Main Processor Unit, be used under the control of Main Processor Unit, being the external connected electronic power devices by the second general input/output port;
Described Main Processor Unit is further used for controlling Power Management Unit and utilizes the power supply unit charging of external connected electronic device power supply (DPS) for the local terminal electronic equipment.
3. according to the described device of on electronic equipment, realizing USB OTG function of claim 2, it is characterized in that, when opening the USB physical layer block by the operating voltage triggering Main Processor Unit of power pins:
Described USB physical layer block, be further used for external electronic equipment being judged according to the state of positive differential signal pins and minus tolerance sub-signal pin, if positive differential signal pins and minus tolerance sub-signal pin short circuit, then notifying Main Processor Unit to carry out the charger charging flow is the power supply unit charging; If positive differential signal pins and minus tolerance sub-signal pin be short circuit not, is the USB slave unit with the local terminal electronic configurations then, notifying Main Processor Unit to carry out the USB charging flow simultaneously is the power supply unit charging;
When dragging down the first general input/output port current potential to earthing potential triggering Main Processor Unit unlatching USB physical layer block by the identification pin:
Described USB physical layer block, being further used for the local terminal electronic configurations is the USB main equipment, notifies Main Processor Unit control power supply unit to give the external connected electronic power devices simultaneously.
4. according to the described device of on electronic equipment, realizing USB OTG function of claim 3, it is characterized in that, described USB physical layer block is further used for, when the operating voltage that detects USB OTG interface unit power pins disappears, perhaps positive differential signal pins and minus tolerance sub-signal pin short circuit, perhaps discern pin and become when unsettled by ground connection, send shutdown signal to the controller of Main Processor Unit, the controller of Main Processor Unit after receiving shutdown signal cuts out the USB physical layer block.
5. according to claim 2 or the 3 or 4 described devices of on electronic equipment, realizing USB OTG function, it is characterized in that, described power supply unit comprises charge pump and battery, Power Management Unit links to each other with battery, the second general input/output port of Main Processor Unit links to each other with the Enable Pin of charge pump, battery links to each other with the input end of charge pump, and the electric charge delivery side of pump links to each other with the power pins of USB OTG interface unit;
When the external connected electronic equipment that connects USB OTG interface unit was charger or USB main equipment, the operating voltage of external connected electronic equipment is the input battery after the Power Management Unit conversion;
When the external connected electronic equipment that connects USB OTG interface unit was the USB slave unit, Main Processor Unit was opened charge pump, utilizes battery power to be the external connected electronic power devices.
6. according to claim 5, it is characterized in that described electric charge delivery side of pump links to each other by the power pins of diode with USB OTG interface unit.
7. on electronic equipment, realize it is characterized in that the method for USB OTG function based on the described device of claim 1 for one kind, comprising:
When external connected electronic equipment inserted or extracts USB OTG linkage unit, the pin state of USB OTG linkage unit triggered Main Processor Unit and opens or close the USB physical layer block;
The USB physical layer block is discerned external electronic equipment when opening, and the local terminal electronic equipment is configured, and the notice Main Processor Unit is carried out powered operation.
8. according to the described method that on electronic equipment, realizes USB OTG function of claim 7, it is characterized in that the detailed process that the pin state of described USB OTG linkage unit triggers Main Processor Unit unlatching USB physical layer block comprises:
If USB OTG interface unit power pins has operating voltage, then trigger Power Management Unit generation look-at-me and send to Main Processor Unit, Main Processor Unit is opened the USB physical layer block; Perhaps,
If USB OTG interface unit identification pin has the earthing potential input, then produce look-at-me and send to Main Processor Unit by the first general input/output port current potential that drags down the acquiescence input high level, Main Processor Unit is opened the USB physical layer block.
9. the described according to Claim 8 method that on electronic equipment, realizes USB OTG function, it is characterized in that, described USB physical layer block is when opening, external electronic equipment is carried out identification, the local terminal electronic equipment is configured, and the detailed process of notice Main Processor Unit execution powered operation comprises:
Whether the power pins of step 1, detection USB OTG interface unit has operating voltage, if power pins has operating voltage, then execution in step two; If power pins does not have operating voltage, then execution in step three;
Whether step 2, the positive differential signal pins that detects USB OTG interface unit and minus tolerance sub-signal pin short circuit, if, then notifying Main Processor Unit to carry out the charger charging flow is the power supply unit charging, otherwise with the local terminal electronic configurations is the USB slave unit, and notifying Main Processor Unit to carry out the USB charging flow simultaneously is the power supply unit charging;
Step 3, when the identification pin that detects USB OTG interface unit has the earthing potential input, be the USB main equipment with the local terminal electronic configurations, notify Main Processor Unit control power supply unit to give the external connected electronic power devices simultaneously.
10. according to claim 7 or the 8 or 9 described methods that on electronic equipment, realize USB OTG function, it is characterized in that the detailed process that each pin state triggering Main Processor Unit of described USB OTG linkage unit is closed the USB physical layer block comprises:
The operating voltage that detects the power pins of USB OTG interface unit when the USB physical layer block disappears, perhaps positive differential signal pins and minus tolerance sub-signal pin short circuit, perhaps discerning pin is become when unsettled by ground connection, controller to Main Processor Unit sends shutdown signal, and the controller of Main Processor Unit after receiving shutdown signal cuts out the USB physical layer block.
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Cited By (38)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102065160A (en) * | 2010-12-02 | 2011-05-18 | 惠州Tcl移动通信有限公司 | Circuit for being externally connected with loudspeaker by utilizing mobile phone |
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