技术领域technical field
本实用新型涉及通用串行总线USB，更具体地讲，涉及一种通用串行总线USB接口的接口电路及便携式终端。The utility model relates to a universal serial bus USB, in particular to an interface circuit of a universal serial bus USB interface and a portable terminal.
背景技术Background technique
通用串行总线USB目前已经是一种被广泛使用的总线标准。此外，USB OTG规范允许设备可作为主机或外设进行工作。USB OTG规范规定，两个设备在数据传输过程中，只能同时存在一个主机(host)和一个外设(device)。可根据设备的USB接口的ID引脚来确定作为主机还是外设。当设备的ID引脚接地时，则认为该设备是主机；当设备的ID引脚悬空时，则认为该设备是外设。The Universal Serial Bus (USB) is currently a widely used bus standard. In addition, the USB OTG specification allows the device to work as a host or as a peripheral. The USB OTG specification stipulates that only one host (host) and one peripheral (device) can exist at the same time during data transmission between two devices. It can be determined whether it is a host or a peripheral according to the ID pin of the USB interface of the device. When the ID pin of the device is grounded, the device is considered a host; when the ID pin of the device is floating, the device is considered a peripheral.
在具有USB接口的设备之中，有的支持OTG功能，有的不支持OTG功能。支持OTG功能的设备可具有主机模式和外设模式，并且在未连接设备时，其ID引脚通常被悬空保持在高电平，从而保持在外设模式。当支持OTG检测功能的设备的ID引脚的电平由于连接的设备而被拉低时，进入主机模式。在外设模式下，设备可以从外部接收电力；在主机模式下，设备可向外部提供电力，而无法接收电力。Among the devices with USB interface, some support OTG function, and some do not support OTG function. A device supporting OTG function can have a host mode and a peripheral mode, and when the device is not connected, its ID pin is usually kept at a high level by floating, thereby maintaining the peripheral mode. When the level of the ID pin of the device supporting the OTG detection function is pulled low due to the connected device, it enters the host mode. In peripheral mode, the device can receive power from the outside; in host mode, the device can provide power to the outside, but cannot receive power.
在USB接口中，ID引脚与GND引脚是相邻的。正常情况下，ID引脚与GND引脚之间阻抗是无穷大，但在使用过程中，进入USB接口的杂物或者汗液、雨水等在ID引脚上电压的长期作用会变成导电的腐蚀液体或杂质，导致ID引脚与GND引脚之间的阻抗变低，甚至短路到GND引脚，从而导致设备误触发进入主机模式，导致设备出现各种问题。例如，可导致无法通过USB对设备进行充电。In the USB interface, the ID pin is adjacent to the GND pin. Under normal circumstances, the impedance between the ID pin and the GND pin is infinite, but during use, the long-term effect of the sundries or sweat, rain, etc. entering the USB interface on the voltage on the ID pin will become a conductive corrosive liquid Or impurities, causing the impedance between the ID pin and the GND pin to become low, or even short-circuited to the GND pin, which will cause the device to be triggered into the host mode by mistake, causing various problems in the device. For example, the device cannot be charged via USB.
实用新型内容Utility model content
本实用新型提供一种通用串行总线USB接口的接口电路及便携式终端，从 而可以有效避免设备误触发进入主机模式。The utility model provides an interface circuit of a universal serial bus USB interface and a portable terminal, thereby effectively preventing the device from being accidentally triggered into a host mode.
根据本实用新型的一方面，提供一种通用串行总线USB接口的接口电路，所述接口电路包括第一电阻器，第一电阻器包括用于连接到第一电源的端子和用于连接到通用串行总线USB接口的标识ID引脚的端子，其特征在于，所述接口电路还包括第二电阻器，所述第二电阻器包括用于连接到所述第二电源的第一端子和用于连接到所述标识ID引脚的第二端子。According to an aspect of the present invention, there is provided an interface circuit of a Universal Serial Bus (USB) interface, the interface circuit includes a first resistor, the first resistor includes a terminal for connecting to a first power supply and a terminal for connecting to a The terminal of the identification ID pin of the universal serial bus USB interface is characterized in that the interface circuit also includes a second resistor, and the second resistor includes a first terminal for being connected to the second power supply and A second terminal for connecting to the ID pin.
可选地，所述第二电源为可控电源，所述接口电路还包括：电压检测器，用于检测所述标识ID引脚处的电压值，并将检测的电压值发送给所述第二电源。Optionally, the second power supply is a controllable power supply, and the interface circuit further includes: a voltage detector, configured to detect a voltage value at the ID pin, and send the detected voltage value to the first Two power supply.
可选地，所述第二电源包括：比较器，将所述电压值与预定阈值进行比较，其中，当所述电压值小于所述预定阈值时所述比较器产生第一控制信号，当所述电压值大于或等于所述预定阈值时所述比较器产生第二控制信号；预定电源；开关，连接到所述预定电源以接收所述预定电源的供电，并且连接到所述比较器以接收所述第一控制信号或所述第二控制信号，其中，当从所述比较器接收到所述第一控制信号时，所述开关导通，以提供接收的供电；当从所述比较器接收到所述第二控制信号时开关断开，以停止提供接收的供电。Optionally, the second power supply includes: a comparator for comparing the voltage value with a predetermined threshold, wherein the comparator generates a first control signal when the voltage value is smaller than the predetermined threshold, and when the When the voltage value is greater than or equal to the predetermined threshold, the comparator generates a second control signal; a predetermined power supply; a switch connected to the predetermined power supply to receive power from the predetermined power supply, and connected to the comparator to receive The first control signal or the second control signal, wherein, when the first control signal is received from the comparator, the switch is turned on to provide the received power supply; The switch is turned off when receiving the second control signal, so as to stop providing the received power supply.
可选地，所述开关包括输入端、输出端以及控制端，其中，所述输入端连接到所述预定电源，以接收所述预定电源的供电，所述输出端连接到所述第二电阻器的第一端子，所述控制端连接到所述比较器以接收所述第一控制信号或所述第二控制信号，其中，当所述控制端接收到所述第一控制信号时所述开关 导通，当所述控制端接收到所述第二控制信号时所述开关断开。Optionally, the switch includes an input terminal, an output terminal and a control terminal, wherein the input terminal is connected to the predetermined power supply to receive power from the predetermined power supply, and the output terminal is connected to the second resistor The first terminal of the controller, the control terminal is connected to the comparator to receive the first control signal or the second control signal, wherein, when the control terminal receives the first control signal, the The switch is turned on, and the switch is turned off when the control terminal receives the second control signal.
可选地，所述接口电路包括多个所述第二电阻器，所述第二电源包括多个所述开关，每个所述开关连接在一个所述第二电阻器与所述预定电源之间，其中，所述比较器在将所述第一控制信号发送给一个所述开关之后再次产生所述第一控制信号时，将再次产生的所述第一控制信号发送给一个未被发送过所述第一控制信号的所述开关。Optionally, the interface circuit includes a plurality of the second resistors, the second power supply includes a plurality of the switches, each of the switches is connected between one of the second resistors and the predetermined power supply , wherein, when the comparator regenerates the first control signal after sending the first control signal to one of the switches, it sends the regenerated first control signal to a switch that has not been sent The switch of the first control signal.
可选地，所述第二电阻器的第一端子连接到包括所述第二电源的处理器的通用输入/输出GPIO端口。Optionally, the first terminal of the second resistor is connected to a general input/output GPIO port of a processor including the second power supply.
可选地，所述第二电阻器的第一端子连接到包括所述第二电源和所述电压检测器的处理器的通用输入/输出GPIO端口，所述标识ID引脚连接到所述处理器的模数转换ADC端口。Optionally, the first terminal of the second resistor is connected to a general input/output GPIO port of a processor including the second power supply and the voltage detector, and the identification ID pin is connected to the processor The analog-to-digital conversion ADC port of the device.
根据本实用新型的另一方面，提供一种具有上述接口电路的便携式终端。According to another aspect of the present invention, a portable terminal having the above-mentioned interface circuit is provided.
根据本实用新型的通用串行总线USB接口的接口电路可以有效避免设备误触发进入主机模式。According to the interface circuit of the universal serial bus USB interface of the utility model, it can effectively prevent the device from entering into the host mode by false triggering.
将在接下来的描述中部分阐述本实用新型另外的方面和/或优点，还有一部分通过描述将是清楚的，或者可以经过本实用新型的实施而得知。Additional aspects and/or advantages of the present utility model will be partially set forth in the following description, and some of them will be clear from the description, or can be known through the implementation of the present utility model.
附图说明Description of drawings
通过下面结合附图进行的详细描述，本实用新型的上述和其它目的、特点和优点将会变得更加清楚，其中：Through the following detailed description in conjunction with the accompanying drawings, the above-mentioned and other purposes, features and advantages of the present utility model will become more clear, wherein:
图1示出根据本实用新型的第一实施例的通用串行总线USB接口的接口电路的框图；Fig. 1 shows the block diagram of the interface circuit of the universal serial bus USB interface according to the first embodiment of the present utility model;
图2示出根据本实用新型的第二实施例的通用串行总线USB接口的接口电路的框图。FIG. 2 shows a block diagram of an interface circuit of a Universal Serial Bus (USB) interface according to a second embodiment of the present invention.
具体实施方式detailed description
现在，将参照附图更充分地描述不同的示例实施例，其中，相同的标号表示相同的元件。Various example embodiments will now be described more fully with reference to the drawings, wherein like numerals refer to like elements.
通用串行总线USB接口至少包括如下引脚：VBUS(电源)、D-(数据负)、D+(数据正)、ID(标识)、GND(地)。上述USB接口的引脚是公知的，不再详述。The USB interface of the universal serial bus includes at least the following pins: VBUS (power supply), D- (data negative), D+ (data positive), ID (identification), and GND (ground). The above-mentioned pins of the USB interface are well known and will not be described in detail.
根据本实用新型的USB接口的接口电路可用于具有USB接口并且具有OTG检测功能的各种电子装置，例如，诸如手机、平板电脑、多媒体播放器、掌上电脑、掌上游戏机的便携式终端以及其他的电子装置。The interface circuit of the USB interface according to the utility model can be used for various electronic devices having a USB interface and having an OTG detection function, for example, portable terminals such as mobile phones, tablet computers, multimedia players, palmtop computers, handheld game consoles, and other electronic device.
图1示出根据本实用新型的第一实施例的USB接口的接口电路的框图。FIG. 1 shows a block diagram of an interface circuit of a USB interface according to a first embodiment of the present invention.
如图1所示，根据一个实施例的USB接口的接口电路100包括：第一电阻器R1、第二电阻器R2。As shown in FIG. 1 , an interface circuit 100 of a USB interface according to an embodiment includes: a first resistor R1 and a second resistor R2 .
第一电阻器R1的一端连接到第一电源VIO_1，另一端连接到USB接口的ID引脚。具体地说，第一电阻器R1包括用于连接到第一电源VIO_1的第一端子T11和用于连接到USB接口的ID引脚的第二端子T12。One end of the first resistor R1 is connected to the first power supply VIO_1, and the other end is connected to the ID pin of the USB interface. Specifically, the first resistor R1 includes a first terminal T11 for connecting to the first power supply VIO_1 and a second terminal T12 for connecting to the ID pin of the USB interface.
第二电阻器R2的一端连接到第二电源VIO_2，另一端连接到USB接口的ID引脚。具体地说，第二电阻器R2包括用于连接到第二电源VIO_2的第一端子T21和用于连接到USB接口的ID引脚的第二端子T22。One end of the second resistor R2 is connected to the second power supply VIO_2, and the other end is connected to the ID pin of the USB interface. Specifically, the second resistor R2 includes a first terminal T21 for connecting to the second power supply VIO_2 and a second terminal T22 for connecting to the ID pin of the USB interface.
在设置了第二电阻器R2的情况下，当USB接口的ID引脚与GND引脚之间的等效电阻异常变小时，USB接口的ID引脚仍处于高电平，避免了误触发进入主机(Host)模式。In the case of setting the second resistor R2, when the equivalent resistance between the ID pin of the USB interface and the GND pin is abnormally small, the ID pin of the USB interface is still at a high level, which avoids false triggering and entering Host mode.
可选地，接口电路100可包括多个第二电阻器R2。Optionally, the interface circuit 100 may include a plurality of second resistors R2.
图2示出根据本实用新型的第二实施例的USB接口的接口电路的框图。Fig. 2 shows a block diagram of an interface circuit of a USB interface according to a second embodiment of the present invention.
与图1所示的接口电路相比，第二实施例的接口电路200还包括电压检测器Dvol。此外，第二电源VIO_2为可控电源。Compared with the interface circuit shown in FIG. 1 , the interface circuit 200 of the second embodiment further includes a voltage detector Dvol. In addition, the second power supply VIO_2 is a controllable power supply.
电压检测器Dvol用于检测USB接口的ID引脚处的电压值。该电压值可用于检测USB接口的ID引脚与GND引脚之间的等效电阻是否发生异常。当该电压值小于预定阈值时可确定ID引脚与GND引脚之间的等效电阻发生异常。The voltage detector Dvol is used to detect the voltage value at the ID pin of the USB interface. This voltage value can be used to detect whether the equivalent resistance between the ID pin and the GND pin of the USB interface is abnormal. When the voltage value is less than the predetermined threshold, it can be determined that the equivalent resistance between the ID pin and the GND pin is abnormal.
电压检测器Dvol将检测的电压值发送给第二电源VIO_2，从而基于该电压值控制第二电源VIO_2的供电。具体地说，第二电源VIO_2将从电压检测器Dvol接收的电压值与预定阈值进行比较，当所述电压值小于预定阈值时第二电源VIO_2进行供电，当所述电压值大于或等于预定阈值时第二电源VIO_2停止供电。换言之，第二电源VIO_2在ID引脚与GND引脚之间的等效电阻发生异常时才进行供电，使得USB接口的ID引脚处于高电平来避免误触发进入Host模式。第二电源VIO_2在ID引脚与GND引脚之间的等效电阻没有发生异常时不进行供电，不对ID引脚处的电平进行调节，从而降低了功耗。The voltage detector Dvol sends the detected voltage value to the second power supply VIO_2, so as to control the power supply of the second power supply VIO_2 based on the voltage value. Specifically, the second power supply VIO_2 compares the voltage value received from the voltage detector Dvol with a predetermined threshold, and when the voltage value is less than the predetermined threshold, the second power supply VIO_2 supplies power, and when the voltage value is greater than or equal to the predetermined threshold At this time, the second power supply VIO_2 stops supplying power. In other words, the second power supply VIO_2 supplies power only when the equivalent resistance between the ID pin and the GND pin is abnormal, so that the ID pin of the USB interface is at a high level to avoid false triggering into the Host mode. The second power supply VIO_2 does not supply power when the equivalent resistance between the ID pin and the GND pin is not abnormal, and does not adjust the level at the ID pin, thereby reducing power consumption.
第二电源VIO_2可包括比较器、预定电源和开关。The second power supply VIO_2 may include a comparator, a predetermined power supply, and a switch.
比较器将从电压检测器Dvol接收的电压值与预定阈值进行比较。当所述电压值小于预定阈值时比较器产生第一控制信号，当所述电压值大于或等于预定阈值时比较器产生第二控制信号。The comparator compares the voltage value received from the voltage detector Dvol with a predetermined threshold. The comparator generates a first control signal when the voltage value is less than a predetermined threshold, and generates a second control signal when the voltage value is greater than or equal to a predetermined threshold.
开关连接到预定电源以接收预定电源的供电，并且连接到比较器以接收第一控制信号或第二控制信号。当从比较器接收到第一控制信号时，开关导通，以提供接收的供电；当从比较器接收到第二控制信号时开关断开，以停止提供接收的供电。The switch is connected to a predetermined power source to receive power from the predetermined power source, and is connected to the comparator to receive the first control signal or the second control signal. When the first control signal is received from the comparator, the switch is turned on to provide the received power; when the second control signal is received from the comparator, the switch is turned off to stop providing the received power.
开关包括输入端、输出端以及控制端，输入端连接到预定电源，以接收预定电源的供电，输出端连接到第二电阻器的第一端子，控制端连接到比较器以接收第一控制信号或第二控制信号，其中，当控制端接收到第一控制信号时开关导通，当控制端接收到第二控制信号时开关断开。根据本实用新型的开关可以是各种具有被控功能的开关，例如，开关可通过晶体管(例如，MOS管)来实现。The switch includes an input terminal, an output terminal and a control terminal, the input terminal is connected to a predetermined power supply to receive power from the predetermined power supply, the output terminal is connected to the first terminal of the second resistor, and the control terminal is connected to the comparator to receive the first control signal Or the second control signal, wherein the switch is turned on when the control terminal receives the first control signal, and the switch is turned off when the control terminal receives the second control signal. The switches according to the present invention can be various switches with controlled functions, for example, the switches can be realized by transistors (eg, MOS transistors).
在另一实施例中，接口电路200包括多个第二电阻器R2，第二电源VIO_2包括多个开关。在此情况下，每个开关连接在一个对应的第二电阻器与预定电源之间。比较器在将第一控制信号发送给一个开关之后再次产生第一控制信号时，将再次产生的第一控制信号发送给一个未被发送过第一控制信号的开关。换言之，当检测到USB接口的ID引脚与GND引脚之间的等效电阻发生异常时，导通与一个第二电阻器R2连接的开关从而为该第二电阻器供电，以尝试拉高ID引脚的电压。当此后电压检测器Dvol检测的电压值仍小于预定阈值时，导通与另一个第二电阻器R2连接的开关从而为另一个第二电阻器供电，继续尝试拉高ID引脚的电压。如果电压检测器Dvol检测的电压值仍小于预定阈值时，则继续导通与下一个第二电阻器R2连接的开关，直至电压值不小于预定阈值或者所有的第二电阻器都被供电(即，与所有的第二电阻器连接的开关都被导通)。In another embodiment, the interface circuit 200 includes a plurality of second resistors R2, and the second power supply VIO_2 includes a plurality of switches. In this case, each switch is connected between a corresponding second resistor and a predetermined power source. When the comparator regenerates the first control signal after sending the first control signal to a switch, it sends the regenerated first control signal to a switch that has not been sent the first control signal. In other words, when it is detected that the equivalent resistance between the ID pin and the GND pin of the USB interface is abnormal, the switch connected to a second resistor R2 is turned on to supply power to the second resistor, in an attempt to pull up voltage on the ID pin. When the voltage value detected by the voltage detector Dvol is still lower than the predetermined threshold, the switch connected to the other second resistor R2 is turned on to supply power to the other second resistor, and continues to try to pull up the voltage of the ID pin. If the voltage value detected by the voltage detector Dvol is still less than the predetermined threshold value, the switch connected to the next second resistor R2 will continue to be turned on until the voltage value is not less than the predetermined threshold value or all the second resistors are powered (i.e. , the switches connected to all the second resistors are turned on).
上面描述的第二电源VIO_2可利用各种可控电源来实现。The second power supply VIO_2 described above can be realized by using various controllable power supplies.
例如，在根据本实用新型的接口电路200应用于谋个设备时，可利用该设备的处理器(CPU)作为第二电源VIO_2。处理器具有比较器的功能并且可作为可控电源使用。在处理器作为可控电源使用时，通过处理器的通用输入/输出(GPIO)端口向外供电。换言之，处理器通常集成有上面描述的比较器、预定电源和开关。此时，处理器可经由自己的输入端口接收电压检测器Dvol检测的电压值，并通过集成的比较器、预定电源和开关来基于该电压值向外进行供电。处理器的GPIO端口作为电源的输出端口连接到第二电阻器R2的第一端子T21。For example, when the interface circuit 200 according to the present invention is applied to a device, the processor (CPU) of the device can be used as the second power supply VIO_2. The processor functions as a comparator and acts as a controllable power supply. When the processor is used as a controllable power supply, it supplies power to the outside through a general-purpose input/output (GPIO) port of the processor. In other words, the processor typically integrates the comparators, predetermined power supplies and switches described above. At this time, the processor can receive the voltage value detected by the voltage detector Dvol through its own input port, and supply power based on the voltage value through an integrated comparator, a predetermined power supply and a switch. The GPIO port of the processor is connected to the first terminal T21 of the second resistor R2 as the output port of the power supply.
同时，电压检测器Dvol也可以通过上面的处理器来实现。处理器通常集成有模数转换功能。可以通过处理器的模数转换(ADC)端口来检测USB接口的ID引脚处的电压值。Meanwhile, the voltage detector Dvol can also be realized by the above processor. Processors usually have integrated analog-to-digital conversion. The voltage value at the ID pin of the USB interface can be detected through an analog-to-digital conversion (ADC) port of the processor.
此外，电压检测器Dvol也可通过独立的电压检测器来实现。In addition, the voltage detector Dvol can also be realized by an independent voltage detector.
根据本实用新型的用于USB接口的接口电路可以有效避免设备误触发进入主机模式。According to the interface circuit for the USB interface of the utility model, it can effectively prevent the device from entering into the host mode by false triggering.
尽管已经参照其示例性实施例具体显示和描述了本实用新型，但是本领域的技术人员应该理解，在不脱离权利要求所限定的本实用新型的精神和范围的情况下，可以对其进行形式和细节上的各种改变。While the invention has been particularly shown and described with reference to exemplary embodiments thereof, it should be understood by those skilled in the art that modifications may be made thereto without departing from the spirit and scope of the invention as defined by the claims. and various changes in details.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620260779.5UCN205721762U (en) | 2016-03-31 | 2016-03-31 | Interface Circuit and Portable Terminal of Universal Serial Bus USB Interface |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620260779.5UCN205721762U (en) | 2016-03-31 | 2016-03-31 | Interface Circuit and Portable Terminal of Universal Serial Bus USB Interface |
| Publication Number | Publication Date |
|---|---|
| CN205721762Utrue CN205721762U (en) | 2016-11-23 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620260779.5UActiveCN205721762U (en) | 2016-03-31 | 2016-03-31 | Interface Circuit and Portable Terminal of Universal Serial Bus USB Interface |
| Country | Link |
|---|---|
| CN (1) | CN205721762U (en) |
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| CN108268402A (en)* | 2016-12-30 | 2018-07-10 | 维沃移动通信有限公司 | Protection circuit, guard method and the mobile terminal of Type-C interfaces |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |