CN101221546A - Device for automatically detecting universal serial bus main unit or peripherals - Google Patents
Device for automatically detecting universal serial bus main unit or peripherals Download PDFInfo
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- CN101221546A CN101221546A CNA2007100019084A CN200710001908A CN101221546A CN 101221546 A CN101221546 A CN 101221546A CN A2007100019084 A CNA2007100019084 A CN A2007100019084A CN 200710001908 A CN200710001908 A CN 200710001908A CN 101221546 A CN101221546 A CN 101221546A
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Abstract
The invention discloses a device capable of automatically detecting general-purpose serial bus hosts or peripheral equipment. In the equipment provided with a USB interface, the device is coupled to external USB equipment through a VBUS pin and judges that the external USB equipment is a USB host or USB peripheral equipment according to the change of the voltage. The device comprises a voltage detection circuit and a voltage detection element, the voltage detection circuit is respectively coupled to the voltage detection element and the VBUS pin of the USB interface. The voltage detection circuit can be a voltage-dividing circuit, and the voltage of the voltage detection circuit can change with the external input signal of the VBUS pin of the USB interface. The voltage detection element is used to detect the voltage change of the voltage detection circuit to judge that the external equipment connected with the voltage detection circuit is one USB host or USB peripheral equipment. With the invention, whether the external equipment is the USB host or the USB peripheral equipment is judged independent of the ID pin; at the same time, the power supply conflict can not be produced.
Description
Technical field
The present invention relates to a kind ofly can detect USB (universal serial bus) (Universal Serial Bus automatically, USB) device of main frame or peripherals, in having the equipment of USB interface, this device is coupled to external USB equipment, and judges that what be attached thereto is usb host or USB peripherals.
Background technology
USB (universal serial bus) (USB) interface is a basic interface standard of portable apparatus, but the initial design of USB is for dispersing the online of main shaft with personal computer (PC), tradition USB just is being positioned in an interface that is connected between computing machine and peripherals at the beginning, the USB peripheral unit can't interconnect each other in intercommunication, as PDA(Personal Digital Assistant) 103, digital camera 104, USB keyboard 105 and USB mouse 106 etc., promptly see through hub (hub) 102a, 102b respectively and be connected, as shown in Figure 1 with personal computer 101.
The framework of master-slave mode has been selected by USB-IF (Implementers Forum) association when formulating the USB basic framework, be about to difficult and complicated loaded down with trivial details work and all give main frame (Host) end, just computing machine is responsible for, periphery (peripheral) equipment that is commonly referred to as that other links to each other with computing machine, that is USB device.But after increasing USB device appearance, the performance of portable electronic product promotes gradually, makes partial devices think the connection of escape PC host side.Therefore, USB-IF association is based on original USB specification, the butt joint standard of deriving and having worked out USB, be called the USB portable (On-The-Go, OTG).
USB OTG is not one and is independent of the standard that USB 2.0 exists, USB OTG is to provide a mode, allow the USB device can escape and being connected of personal computer, a notion that possesses dual role device (Dual-role device) is provided in the specification of USB OTG 1.0, that is to say the device of an OTG, both main frame can be worked as, also the peripherals end can be worked as.Thus, arbitrarily USB can reach the point-to-point of master-slave mode with USB OTG device and is connected.
Equipment in USB OTG function uses a kind of novel mini-AB connector (connector), increased an ID pin newly, in the USB of two interconnection OTG device, tell the USB OTG main process equipment 201 of serving as master control person and controlled person's USB OTG peripherals 202 by the ID pin.ID pin two 01a is set as " 0 " a side, be appointed as and serve as master control person; The relative USB peripherals of serving as controlled person then then is set as sky with ID pin two 01b and meets (NC), as shown in Figure 2.
In USB OTG, main process equipment is called A equipment, and peripherals is called B equipment, and it is that connected mode with connector decides its master-slave equipment.After two equipment connect, its principal and subordinate role can also change, A equipment (main frame) provides power supply VBUS to B equipment (periphery), but consider that what serve as master control person also is a mobile device mostly, its electric power that carries is limited, also will be supplied to peripherals, therefore reduces the supply current standard, make 8mA into from minimum 100mA, voltage then is modified to 4.4 volts of (V)～5.25V.
Because the role when USB OTG must rely on the ID pin and decides mutual connection; but general user is when using USB OTG apparatus interconnection; regular meeting is confused about the use of mini-AB connector; and cause USB OTG equipment can't convert correct role (main frame or periphery) to, cause and use inconvenience.
Also have a problem to be, though some has the application product of USB interface, can support the connector of standard (standard) and mini-AB simultaneously, but when a USB OTG equipment was connected to a standard usb host, its VBUS pin can be because the conflict of power supply generation simultaneously.
Summary of the invention
The invention provides a kind of device that can detect usb host or peripherals automatically, the invention provides in an equipment that has a USB interface, this device couples with the VBUS pin of the USB interface of equipment, and, judge that the external USB equipment that is attached thereto is that a usb host still is a USB peripherals according to the variation of voltage.
The device that can detect usb host or peripherals automatically of the present invention comprises voltage detecting circuit and a voltage detecting (voltage detector) element.Wherein, voltage detecting circuit is coupled to the VBUS pin of voltage detector component and USB interface respectively.
Voltage detector component then judges that by the change in voltage that detects voltage detecting circuit the external unit that is attached thereto is a usb host or USB peripherals.Do not need as traditional USB otg standard, must utilize the ID pin of connector to distinguish main process equipment end or peripherals end.
For instance, voltage detecting circuit can be a bleeder circuit, and its simple bleeder circuit is as described below:
One first resistance R of connecting
1With one second resistance R
2Between a power supply and an earthing potential, while one capacitor C
1With second resistance R
2Parallel connection, and be connected respectively to resistance R
1With R
2Between node A and earthing potential between.The voltage of the node A of voltage detecting circuit can change according to the external input voltage signal of the VBUS pin of USB interface.Voltage detector component then is used for detecting the change in voltage of the node A of bleeder circuit, judges that the external unit that is attached thereto is a usb host or USB peripherals.
According to the present invention, two continuous USB device can both be linked up no matter it is the USB interface or the USB OTG interface of tradition (standard), in the time of can not being preset as usb host equipment and linking to each other because of two, and cause the voltage conflict of VBUS pin.When this device detects the external USB device and is main process equipment, will adjustment itself become peripherals; Similarly, when detecting the external USB device and be peripherals, then adjustment itself becomes main process equipment.
In one embodiment of the invention, when the one USB device platform that has apparatus of the present invention is connected with a usb host equipment, the node A of the voltage detecting circuit of apparatus of the present invention and the VBUS pin of USB interface couple, and the voltage of the VBUS pin of usb host equipment end output 5V is to node A, and to 1 charging (charge) of the capacitor C in the voltage detecting circuit, to increase the magnitude of voltage of node A, the voltage that voltage detection unit detects node A raises.So, can know that external unit is a usb host equipment, this USB device platform just can convert oneself to controlled peripherals.
In the another embodiment of the present invention, when the one USB device platform that has apparatus of the present invention is connected with a USB peripherals, the node A of the bleeder circuit with transformation node of apparatus of the present invention and the VBUS pin of USB interface couple, when USB peripherals is started working, to obtain power supply from the VBUS pin the USB device platform that has apparatus of the present invention, to cause the electric capacity in the voltage detecting circuit to begin discharge (discharge), and reduce the magnitude of voltage of node A.At this moment, voltage detection unit detects the voltage reduction of node A.So, can know that external unit is a USB peripherals, this USB OTG equipment platform just can convert oneself to the main process equipment of master control.
Utilize the present invention, do not rely on the ID pin and judge usb host and USB peripherals, simultaneously, also can not produce the power supply conflict.
Description of drawings
The synoptic diagram that Fig. 1 is connected with peripherals for personal computer in traditional USB framework;
Fig. 2 is USB OTG device is distinguished host/peripheral equipment by the ID pin a synoptic diagram;
Fig. 3 is the structural representation that can detect the device of usb host or peripherals automatically of the present invention;
Fig. 4 is the synoptic diagram of the voltage detecting circuit of apparatus of the present invention, and it is realized by bleeder circuit;
Fig. 5 is the synoptic diagram that the device of one embodiment of the invention is connected with usb host;
Fig. 6 is the synoptic diagram that the device of another embodiment of the present invention is connected with USB peripherals.
Wherein, Reference numeral:
101 personal computer 102a, 102b hub
103 personal digital assistants, 104 digital cameras
105 USB keyboards, 106 USB mouses
201 USB OTG main process equipments, 202 USB OTG peripherals
201a, 201b ID pin 301 have the equipment of USB interface
303 voltage detecting circuits, 305 voltage detector components
The pin of VBUS, D+, D-, GND, ID USB (universal serial bus)
410 power supplys, 411 earthing potentials
R
1, R
2Resistance C
1Capacitor
A node 510 usb host equipment
V
1Power supply 610 USB peripherals
Embodiment
Fig. 3 is the structural representation that can detect the device of usb host or peripherals automatically of the present invention, and wherein this device is applied in the equipment 301 with USB interface.As shown in Figure 3, this device that can detect usb host or peripherals automatically comprises a voltage detecting circuit 303 and a voltage detector component 305.Wherein, voltage detecting circuit 303 is connected with the VBUS pin of voltage detector component 305 and USB interface respectively.
The voltage signal of the external unit VBUS pin that the voltage of this voltage detecting circuit 303 can receive according to the VBUS pin of USB interface changes.Voltage detector component 305 then detects the change in voltage of this voltage detecting circuit 303 and judges that the external unit that is attached thereto is a usb host or USB peripherals.Do not need as traditional USB otg standard, must utilize the ID pin of connector to distinguish main process equipment end and peripherals end.
Be without loss of generality, the voltage detecting circuit 303 of device of the present invention can utilize a bleeder circuit to be realized, as shown in Figure 4, wherein this device is applied in 301 li of equipment that has a USB interface.As shown in Figure 4, this device that can detect usb host or peripherals automatically comprises a voltage detecting circuit 303 and a voltage detector component 305.Wherein, the structure of this voltage detecting circuit 303 is as described below: one first resistance R of connecting
1With one second resistance R
2Between a power supply 410 and an earthing potential 411, while one capacitor C
1With second resistance R
2Parallel connection, and be couple to resistance R respectively
1With R
2Between node A and earthing potential 411 between.
The node A of this voltage detecting circuit 303 is coupled to the VBUS pin of voltage detector component 305 and USB interface respectively, and the voltage of the node A of voltage detecting circuit 303, changes according to the voltage signal of the external unit input of the VBUS pin of USB interface.The voltage rise and fall of 305 detection node A of voltage detector component judge that the external unit that is attached thereto is a usb host or USB peripherals.
Fig. 5 is an embodiment according to Fig. 4, and the synoptic diagram that device of the present invention is connected with usb host is described.
As shown in Figure 5, this device is applied to a USB device platform 501, and this USB device platform 501 is desired to be connected with a usb host equipment 510.Wherein, this device that can detect usb host or USB peripherals automatically comprises a voltage detecting circuit 303 and a voltage detector component 305, and this voltage detecting circuit 303 couples with the VBUS pin of voltage detector component 305 and USB interface respectively.
So the magnitude of voltage of node A is 2.5V.
When USB device platform 501 when usb host equipment 510 connects therewith, the VBUS pin interconnection of its USB interface, then the voltage of the VBUS pin of usb host equipment 510 ends output 5V is to the node A of voltage detecting circuit 303, because the voltage (5V) of the VBUS pin of usb host equipment 410 ends is greater than the voltage 2.5V of node A, so the capacitor C in the voltage detecting circuit 303
1Just begin charging, to increase the magnitude of voltage of node A.At this moment, the magnitude of voltage that voltage detector component 305 detects node A is higher than 2.5V, and then USB device platform 501 can learn that what be attached thereto is usb host equipment, and simultaneously, USB device platform 501 will oneself convert controlled peripherals to.
Fig. 6 is another embodiment of device of the present invention.As shown in Figure 6, this device is applied in a USB device platform 601, and desires to be connected with a USB peripherals 610.Wherein, the voltage detector component 305 of this device is connected to the node A of voltage detecting circuit 303, and the node A VBUS pin connection of USB device platform 601 therewith.
In this embodiment, the power supply V of voltage detecting circuit 303
1The voltage of supply 3.3V, and resistance R
1Resistance value be 8K ohm, resistance R
2Resistance value be 25K ohm.Therefore when node A is not connected with USB peripherals 610 as yet, the magnitude of voltage of this node A can be calculated by following formula:
So the magnitude of voltage of node A is 2.5V.
When USB device platform 601 is connected with USB peripherals 610, because the VBUS pin of USB peripherals 610 ends there is no output voltage to node A.So, when USB peripherals 610 is started working, will obtain power supply from the VBUS pin the USB device platform 601.And this phenomenon will cause the capacitor C in the voltage detecting circuit 303
1Begin discharge, then therefore the magnitude of voltage of node A begins to descend.At this moment, the magnitude of voltage that detects node A when voltage detector component 305 is lower than 2.5V, then USB device platform 601 can learn that what be attached thereto is peripherals, and USB device platform 601 just converts oneself to the main process equipment of master control, and is responsible for providing power supply to USB peripherals 610.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (8)
1. device that can detect USB host or peripherals automatically is applied to comprise in the equipment with USB (universal serial bus):
One voltage detecting circuit is coupled to the VBUS pin of this equipment with USB (universal serial bus); And
One voltage detector component is coupled to this voltage detecting circuit.
2. the device that can detect USB host or peripherals automatically according to claim 1 is characterized in that this USB (universal serial bus) comprises one or more in USB1.0, USB1.1, USB2.0 and the USBOTG standard.
3. the device that can detect USB host or peripherals automatically according to claim 1, it is characterized in that, the voltage that this voltage detector component detects this voltage detecting circuit raises, and then this equipment with USB (universal serial bus) becomes a USB host equipment.
4. the device that can detect USB host or peripherals automatically according to claim 1, it is characterized in that, the voltage that this voltage detector component detects this voltage detecting circuit reduces, and then this equipment with USB (universal serial bus) becomes a USB (universal serial bus) peripherals.
5. the device that can detect USB host or peripherals automatically according to claim 1 is characterized in that this voltage detecting circuit is a bleeder circuit.
6. the device that can detect USB host or peripherals automatically according to claim 5 is characterized in that this voltage detecting circuit comprises:
Power supply, first resistance, second resistance and the earthing potential of series connection;
One capacitor, in parallel with this second resistance, and this capacitor is couple to respectively between the node and this earthing potential between this first resistance and this second resistance, and this node is coupled to this VBUS pin of this equipment with USB (universal serial bus).
7. the device that can detect USB host or peripherals automatically according to claim 6, it is characterized in that, the VBUS pin of one second universal serial bus device is connected with the VBUS pin that this has the equipment of USB (universal serial bus), when this this node with the VBUS pin of equipment of USB (universal serial bus) and this voltage detecting circuit couples, this capacitor discharge reduces this node voltage, this voltage detector component detects this node voltage to be reduced, and then detecting this second universal serial bus device is USB (universal serial bus) peripherals.
8. the device that can detect USB host or peripherals automatically according to claim 6, it is characterized in that, the VBUS pin of one second universal serial bus device is connected with the VBUS pin that this has the equipment of USB (universal serial bus), when this this node with the VBUS pin of equipment of USB (universal serial bus) and this voltage detecting circuit couples, this capacitor charging improves this node voltage, this voltage detector component detects this node voltage and raises, and then detecting this second universal serial bus device is USB host equipment.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710001908A CN100583074C (en) | 2007-01-12 | 2007-01-12 | Device for automatically detecting universal serial bus main unit or peripherals |
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|---|---|---|---|
| CN200710001908A CN100583074C (en) | 2007-01-12 | 2007-01-12 | Device for automatically detecting universal serial bus main unit or peripherals |
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| CN101221546A true CN101221546A (en) | 2008-07-16 |
| CN100583074C CN100583074C (en) | 2010-01-20 |
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| CN200710001908A Active CN100583074C (en) | 2007-01-12 | 2007-01-12 | Device for automatically detecting universal serial bus main unit or peripherals |
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|---|---|
| CN100583074C (en) | 2010-01-20 |
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Effective date of registration: 20150915 Address after: Nangang Road, Nangang District Taipei city Taiwan Chinese 3 No. 48 7 floor Patentee after: Wangjiu Science & Technology Co., Ltd. Address before: Hsinchu City, Taiwan, China Patentee before: Qiyan Electronic Co., Ltd. |