CN212569763U - Terminal - Google Patents
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- CN212569763U CN212569763U CN202021280882.9U CN202021280882U CN212569763U CN 212569763 U CN212569763 U CN 212569763U CN 202021280882 U CN202021280882 U CN 202021280882U CN 212569763 U CN212569763 U CN 212569763U
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Abstract
The embodiment of the utility model discloses terminal, include: the USB interface comprises an identification pin; the identification unit is electrically connected with the identification pin and used for identifying the impedance of the identification pin and generating voltage corresponding to the impedance of the identification pin; and the at least two switch units are respectively connected between the identification unit and the processor of the terminal, each switch unit is used for transmitting one voltage output by the identification unit to the processor, and the voltages transmitted by different switch units are different, so that the processor determines the external equipment connected with the USB interface. The embodiment of the utility model provides a technical scheme has improved the efficiency of discerning external equipment.
Description
Technical Field
The embodiment of the utility model provides a relate to equipment identification technical field, especially relate to a terminal.
Background
Among terminals, a USB (Universal Serial Bus) interface is an external Bus standard for standardizing connection and communication between the terminal and external devices.
When the USB interface identifies the external device, the processor such as a CPU (Central Processing Unit) or an SOC (System on Chip) detects a differential signal of the USB2.0 or USB3.0 interface to realize the identification function, which results in a large number of electrical signals being occupied and reduces the efficiency of the terminal for identifying the external device.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides a terminal to improve the efficiency of discerning external equipment.
An embodiment of the utility model provides a terminal, include:
a USB interface including an identification pin;
the identification unit is electrically connected with the identification pin and is used for identifying the impedance of the identification pin and generating voltage corresponding to the impedance of the identification pin;
at least two switch units respectively electrically connected with the identification unit and the processor of the terminal, wherein each switch unit is used for transmitting one voltage output by the identification unit to the processor, and the voltages transmitted by different switch units are different, so that the processor determines the type of the external equipment connected with the USB interface.
Optionally, the switch unit includes an input terminal, an output terminal, and a control terminal;
the identification unit comprises a first output end and a second output end which are in one-to-one correspondence with the switch units; the first output end is electrically connected with the input end of the switch unit, the second output end is electrically connected with the control end of the switch unit, and the output end of the switch unit is electrically connected with the processor; the first output end of the identification unit is used for outputting the voltage transmitted by the switch unit; and the second output end of the identification unit is used for outputting a control signal for controlling the opening and closing of the switch unit.
Optionally, the switch unit further includes:
the circuit comprises a first resistor, a second resistor, a third resistor, a first capacitor, a first transistor and a second transistor;
the input end of the switch unit is electrically connected with the first resistor, the first capacitor and the first end of the first transistor; a second end of the first resistor is electrically connected with a second end of the first capacitor and a control end of the first transistor, and a second end of the first transistor is electrically connected with an output end of the switch unit; the control end of the switch unit is electrically connected with the first end of the second resistor, the second end of the second resistor is electrically connected with the first end of the third resistor and the control end of the second transistor, the first end of the second transistor is electrically connected with the control end of the first transistor, and the second end of the third resistor and the second end of the second transistor are grounded.
Optionally, the switch unit further includes a relay, a pair of contacts of the relay are respectively used as an input end and an output end of the relay, one end of a coil of the relay is used as a control end of the relay, and the other end of the coil is connected to a reference voltage.
Optionally, a ratio of the voltage output by each of the identification units to the impedance of the external device is constant.
Optionally, the identification unit includes an impedance measurement chip, and the impedance measurement chip includes a digital integrated circuit implemented by an FPGA.
Optionally, the external device includes: an HDMI device power adapter and/or a USB flash drive.
Optionally, the processor is an SOC or a CPU.
An embodiment of the utility model provides a terminal, include: the USB interface comprises an identification pin; the identification unit is electrically connected with the identification pin and used for identifying the impedance of the identification pin and generating voltage corresponding to the impedance of the identification pin; and the at least two switch units are respectively connected between the identification unit and the processor of the terminal, each switch unit is used for transmitting one voltage output by the identification unit to the processor, and the voltages transmitted by different switch units are different, so that the processor determines the external equipment connected with the USB interface. The embodiment of the utility model provides a technical scheme passes through the impedance of identification element discernment pin to produce the voltage of the impedance that corresponds the discernment pin, different switch unit transmits different voltage to the type of treater in order to confirm the external equipment who inserts the USB interface, has improved the efficiency of discerning the external equipment.
Drawings
Fig. 1 is a block diagram of a terminal according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a switch unit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another switch unit according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
The embodiment of the utility model provides a terminal, figure 1 is the utility model provides a structural diagram at terminal, terminal includes:
a USB interface 10 including an identification pin;
the identification unit 20 is electrically connected with the identification pin, and is used for identifying the impedance of the identification pin and generating a voltage corresponding to the impedance of the identification pin;
at least two switch units 30 respectively connected between the identification unit 10 and the processor 40 of the terminal, each switch unit 30 being configured to transmit a voltage output by the identification unit 20 to the processor 40, the voltages transmitted by different switch units 30 being different, so that the processor 40 determines the external device 1 connected to the USB interface 10.
Specifically, the USB interface 10 is a serial bus interface for connecting a terminal and the external device 1, and is widely applied to information communication products such as personal computers and mobile devices, and is extended to other related fields such as camera equipment, digital televisions (set-top boxes), game machines, and the like. The terminal provided by the present embodiment includes a USB interface 10, an identification unit 20, and at least two switch units 30. The USB interface 10 includes an identification pin, the identification unit 20 is electrically connected to the identification pin, and when the external device 1 is connected to the USB interface 10, the identification unit 20 can identify the impedance connected to the external device 1 by identifying the impedance of the identification pin. The terminal further comprises at least two switching units 30, each switching unit 30 being connected between the identification unit 20 and the processor 40 of the terminal. The identification unit 20 may be adapted to generate a voltage corresponding thereto based on the identified impedance. The identification unit 20 may include an internal logic circuit composed of devices such as a logic analyzer, a comparator, and a MOS transistor, when different devices are inserted into the USB interface 10, the identification pin 11 connected to the external device 1 and the internal logic circuit of the identification unit 20 form a closed loop, and the identification unit 20 discriminates according to different impedances of the identification pin to generate corresponding voltages. Different external device types have different impedances, different external device types are connected to the terminal USB interface 10, and the identification unit 20 can generate different voltages. For example, when the HDMI device is connected to the USB interface of the terminal, the voltage generated by the identification unit 20 corresponding to the impedance of the identification pin is 3V; when the power adapter is connected to the terminal USB interface, the voltage generated by the identification unit 20 corresponding to the impedance of the identification pin is 4.5V; when the USB flash disk is connected to the USB interface of the terminal, the voltage generated by the identification unit 20 corresponding to the impedance of the identification pin is 6V. The state of the switching unit 30 when the external device 1 is not accessed is off, and the conduction of different switching units is controlled, so that the transmission of different voltages to the processor 40 can be realized. That is, each switch unit 30 is used for transmitting one voltage output by the identification unit 20 to the processor 40, the voltages transmitted by different switch units 30 are different, and the processor 40 determines the type of the external device 1 connected to the USB interface 10 according to the different voltages received.
Compared with the prior art, the embodiment of the utility model provides a technical scheme is through addding the discernment pin at the USB interface, and the impedance that different external equipment types produced is different, and the change of impedance is discerned according to the discernment pin to the discernment unit realizes the change of voltage to switch on in order to be defeated for the treater at terminal with the voltage of difference through controlling different switch units, thereby realize the terminal to the quick discernment of external equipment type, simplified the discernment flow, improved the efficiency of discerning external equipment.
The embodiment of the utility model provides a terminal, on the basis of above-mentioned embodiment, the embodiment of the utility model provides a to the switch unit and the recognition cell at terminal with supplemented and refine. The switch unit comprises an input end, an output end, a control end and a circuit formed by components such as a resistor and a transistor.
Optionally, fig. 2 is a circuit diagram of a switch unit according to an embodiment of the present invention, and referring to fig. 2, in combination with fig. 1, the switch unit 30 includes an input terminal a, an output terminal B, and a control terminal C; the recognition unit 20 includes first and second output terminals E1 and E2 in one-to-one correspondence with the switching units 30; the first output end E1 is electrically connected with the input end a of the switch unit 30, and the second output end E2 is electrically connected with the control end C of the switch unit 30; the output terminal B of the switching unit 30 is electrically connected to the processor 40. Wherein, the first output terminal E1 of the identification unit 20 is used for outputting the voltage transmitted by the switch unit 30; the second output E2 of the identification unit 20 is used for outputting a control signal for controlling the opening and closing of the switch unit 30.
Specifically, the identification unit 20 may include an internal logic circuit composed of a logic analyzer, a comparator, an MOS transistor, and the like, when different external devices are connected to the USB interface 10, the identification pin connected to the external device 1 and the internal logic circuit of the identification unit 20 form a closed loop, different external devices may generate different impedances at the identification pin, and the identification unit 20 discriminates according to the impedance value of the identification pin to generate a corresponding voltage and a corresponding control signal. Each switching unit 30 includes an input terminal a, an output terminal B, and a control terminal C; the recognition unit 20 includes first and second output terminals E1 and E2 in one-to-one correspondence with the switching units 30; the first output terminal E1 is electrically connected to the input terminal a of the switch unit 30, and the second output terminal E2 is electrically connected to the control terminal C of the switch unit 30. Wherein, the first output terminal E1 of the identification unit 20 is used for outputting the voltage transmitted by the switch unit 30; the second output E2 of the identification unit 20 is used for outputting a control signal for controlling the opening and closing of the switch unit 30. It should be noted that the voltage generated by the identification unit 20 according to the impedance may be transmitted to the input terminal a of each switch unit 30, but the control signal generated by the identification unit 20 according to the identified different impedance is only correspondingly transmitted to the control terminal C of one switch unit 30, the switch of the control terminal C receiving the control signal is turned on, the voltage received by the switch input terminal a is output to the processor 40 through the output terminal B of the switch, and the processor 40 may determine the type of the external device 1 connected to the USB interface 10 according to the received voltage. The processor 40 may be an SOC or a CPU.
Optionally, the switch unit 30 further includes:
the circuit comprises a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, a first transistor Q1 and a second transistor Q2;
an input terminal a of the switching unit 30 is electrically connected to the first resistor R1, the first capacitor C1 and a first terminal of the first transistor Q1; a second terminal of the first resistor R1 is electrically connected to the second terminal of the first capacitor C1 and the control terminal of the first transistor Q1, and a second terminal of the first transistor Q1 is electrically connected to the output terminal B of the switching unit 30; the control terminal of the switch unit 30 is electrically connected to the first terminal of the second resistor R2, the second terminal of the second resistor R2 is electrically connected to the first terminal of the third resistor R3 and the control terminal of the second transistor Q2, the first terminal of the second transistor Q2 is electrically connected to the control terminal of the first transistor Q1, and the second terminal of the third resistor R3 and the second terminal of the second transistor Q2 are grounded.
For example, the first transistor Q1 may be a pfet, the second transistor Q2 may be an nfet, when the control signal inputted from the control terminal C of the switching unit 30 is at a high level, the nfet is turned on, and the control terminal of the pfet is grounded and turns on the pfet, so that the voltage inputted from the input terminal a of the switching unit 30 may be outputted through the output terminal B of the switching unit 30, and the processor 40 may determine the type of the external device 1 connected to the USB interface 10 according to the received voltage.
Alternatively, the ratio of the voltage output by each identification unit 20 to the impedance of the external device 1 is constant.
Optionally, the external device 1 includes: an HDMI device, a power adapter, and/or a usb disk.
Illustratively, the terminal can recognize three kinds of external devices 1, an HDMI device, a power adapter, and a usb disk. The impedance of the HDMI device is 1K Ω, and when the HDMI device is connected to the USB interface 10, the identification unit 20 identifies that the impedance of the identification pin is 1K Ω, and at this time, the voltage generated by the identification unit 20 and corresponding to the impedance of the identification pin is 3V. The impedance of the power adapter is 1.5K Ω, and when the power adapter is connected to the USB interface 10, the identification unit 20 identifies that the impedance of the identification pin is 1.5K Ω, and at this time, the voltage generated by the identification unit 20 and corresponding to the impedance of the identification pin is 4.5V. The impedance of the USB disk is 2K Ω, and when the USB disk is connected to the USB interface 10, the identification unit 20 identifies that the impedance of the identification pin is 2K Ω, and the voltage generated by the identification unit 20 corresponding to the impedance of the identification pin is 6V.
The terminal can identify three external devices 1, namely an HDMI device, a power adapter and a USB flash disk, and correspondingly comprises a first switch unit, a second switch unit and a third switch unit. The impedance of the HDMI device is 1K Ω, the HDMI device is connected to the USB interface 10, the identification unit 20 generates the impedance corresponding to the identification pin to generate a first control signal, the identification unit 20 transmits the generated first control signal to the control terminal of the first switch unit corresponding to the identification pin, and the first switch is turned on to transmit the 3V voltage received by the input terminal of the first switch to the processor 40 through the output terminal. The impedance of the power adapter is 1.5K Ω, the power adapter is connected to the USB interface 10, at this time, the identification unit 20 generates the impedance corresponding to the identification pin to generate the second control signal, the identification unit 20 transmits the generated second control signal to the control end of the second switch unit corresponding to the identification pin, at this time, the second switch is turned on, and the 4.5V voltage received by the input end of the second switch is transmitted to the processor 40 through the output end. The impedance of the USB flash disk is 2K Ω, the USB flash disk is connected to the USB interface 10, the identification unit 20 generates the impedance corresponding to the identification pin to generate a third control signal, the identification unit 20 transmits the generated third control signal to the control end of the third switch unit corresponding to the identification pin, the third switch is turned on, and the 6V voltage received by the input end of the third switch is sent to the processor 40 through the output end. The processor 40 may determine that the external device is an HDMI device according to the received 3V voltage, the processor 40 may determine that the external device is a power adapter according to the received 4.5V voltage, and the processor 40 may determine that the external device is a usb disk according to the received 6V voltage. The voltage change is realized by recognizing the impedance change according to the recognition pin, and different voltages are output to the processor 40 of the terminal by controlling the conduction of different switch units 30, so that the type of the external device 1 is recognized by the terminal, the circuit and the recognition process are simplified, and the efficiency of recognizing the external device 1 is improved. It should be noted that, this is only an example of three cases, and in practical application, the number of the identification devices and the number of the switch units may be increased according to the needs.
Optionally, the identification unit 20 includes an impedance measurement chip including a digital integrated circuit implemented by a Field-Programmable Gate Array (FPGA). FPGAs are further developed based on Programmable devices such as Programmable Array Logic (PAL), Generic Array Logic (GAL), and Complex Programmable Logic Device (CPLD). The circuit is used as a semi-custom circuit in the field of Application Specific Integrated Circuits (ASICs), not only overcomes the defects of the custom circuit, but also overcomes the defect that the number of gate circuits of the original programmable device is limited.
The embodiment of the utility model provides a technical scheme is through addding the discernment pin at the USB interface, and the change of impedance is discerned according to the discernment pin to the discernment unit realizes the change of voltage to switch on with the electric pressure of difference for the treater at terminal through controlling different switch units, wherein the switch unit includes input, output and control end, and through the circuit that components and parts such as resistance and transistor constitute. Therefore, the terminal can identify the type of the external equipment, the circuit and the identification process are simplified, and the efficiency of identifying the external equipment is improved.
The embodiment of the utility model provides a terminal, on the basis of above-mentioned embodiment, the embodiment of the invention has supplemented and refined the switch unit 30 and the recognition element 20 of terminal. Wherein each switching unit 30 is a relay.
Optionally, fig. 3 is a schematic structural diagram of another switch unit provided by the embodiment of the present invention, referring to fig. 3, and with reference to fig. 1, the switch unit 30 further includes a relay, a pair of contacts of the relay respectively serve as an input terminal a and an output terminal B thereof, one end of a coil of the relay serves as a control terminal C thereof, and the other end D of the coil is connected to a reference voltage.
Specifically, each switch unit 30 may also be a relay, and different voltages are transmitted to the processor 40 through different relays by controlling the on-state of the relay. A pair of contacts of the relay are respectively used as an input end A and an output end B of the relay, one end of a coil of the relay is used as a control end C of the relay, and the other end D of the coil is connected with a reference voltage. The recognition unit 20 includes first and second output terminals E1 and E2 in one-to-one correspondence with the relays; the first output end E1 is electrically connected with the input end A of the relay, and the second output end E2 is electrically connected with the control end C of the relay; wherein, the first output terminal E1 of the identification unit 20 is used for outputting the voltage transmitted by the relay; the second output E2 of the identification unit 20 is used to output a control signal for controlling the on-state of the relay. It should be noted that the voltage generated by the identification unit 20 according to the impedance may be transmitted to the input terminal a of each relay, but the control signal generated by the identification unit 20 according to the identified different impedance is only correspondingly transmitted to the control terminal C of one relay, the relay whose control terminal receives the control signal is turned on, the voltage received by the input terminal of the relay is output to the processor 40 through the output terminal of the relay, and the processor 40 may determine the type of the external device 1 connected to the USB interface 10 according to the received voltage. The circuit and the identification process are further simplified, and the efficiency of identifying the external equipment is improved.
Alternatively, the ratio of the voltage output by each identification unit 20 to the impedance of the external device 1 is constant.
Optionally, the external device 1 includes: an HDMI device, a power adapter, and/or a usb disk.
Illustratively, the terminal can recognize three kinds of external devices 1, an HDMI device, a power adapter, and a usb disk. The impedance of the HDMI device is 1K Ω, and when the HDMI device is connected to the USB interface 10, the identification unit 20 identifies that the impedance of the identification pin is 1K Ω, and at this time, the voltage generated by the identification unit 20 and corresponding to the impedance of the identification pin 11 is 3V. The impedance of the power adapter is 1.5K Ω, and when the power adapter is connected to the USB interface 10, the identification unit 20 identifies that the impedance of the identification pin is 1.5K Ω, and at this time, the voltage generated by the identification unit 20 and corresponding to the impedance of the identification pin is 4.5V. The impedance of the USB disk is 2K Ω, and when the USB disk is connected to the USB interface 10, the identification unit 20 identifies that the impedance of the identification pin is 2K Ω, and the voltage generated by the identification unit 20 corresponding to the impedance of the identification pin is 6V.
Optionally, the identification unit 20 includes an impedance measurement chip including a digital integrated circuit implemented by a Field-Programmable Gate Array (FPGA). FPGAs are further developed based on Programmable devices such as Programmable Array Logic (PAL), Generic Array Logic (GAL), and Complex Programmable Logic Device (CPLD). The circuit is used as a semi-custom circuit in the field of Application Specific Integrated Circuits (ASICs), not only overcomes the defects of the custom circuit, but also overcomes the defect that the number of gate circuits of the original programmable device is limited.
The embodiment of the utility model provides a technical scheme is through addding the discernment pin at the interface, and the change of impedance is discerned according to the discernment pin to the discernment unit realizes the change of voltage to switch on with the electric pressure of difference for the treater at terminal through controlling different switch units, wherein every switch unit is a relay. Therefore, the terminal can identify the type of the external equipment, the circuit and the identification process are further simplified, and the efficiency of identifying the external equipment is improved.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
Claims (8)
1. A terminal, comprising:
a USB interface including an identification pin;
the identification unit is electrically connected with the identification pin and is used for identifying the impedance of the identification pin and generating voltage corresponding to the impedance of the identification pin;
at least two switch units respectively electrically connected with the identification unit and the processor of the terminal, wherein each switch unit is used for transmitting one voltage output by the identification unit to the processor, and the voltages transmitted by different switch units are different, so that the processor determines the type of the external equipment connected with the USB interface.
2. The terminal of claim 1, wherein the switching unit comprises an input terminal, an output terminal, and a control terminal;
the identification unit comprises a first output end and a second output end which are in one-to-one correspondence with the switch units; the first output end is electrically connected with the input end of the switch unit, the second output end is electrically connected with the control end of the switch unit, and the output end of the switch unit is electrically connected with the processor; the first output end of the identification unit is used for outputting the voltage transmitted by the switch unit; and the second output end of the identification unit is used for outputting a control signal for controlling the opening and closing of the switch unit.
3. The terminal of claim 2, wherein the switching unit further comprises:
the circuit comprises a first resistor, a second resistor, a third resistor, a first capacitor, a first transistor and a second transistor;
the input end of the switch unit is electrically connected with the first resistor, the first capacitor and the first end of the first transistor; a second end of the first resistor is electrically connected with a second end of the first capacitor and a control end of the first transistor, and a second end of the first transistor is electrically connected with an output end of the switch unit; the control end of the switch unit is electrically connected with the first end of the second resistor, the second end of the second resistor is electrically connected with the first end of the third resistor and the control end of the second transistor, the first end of the second transistor is electrically connected with the control end of the first transistor, and the second end of the third resistor and the second end of the second transistor are grounded.
4. A terminal according to claim 1, wherein the switching unit further comprises a relay having a pair of contacts as its input and output terminals, respectively, one end of a coil of the relay being its control terminal, the other end of the coil being connected to a reference voltage.
5. The terminal of claim 1, wherein the ratio of the voltage output by each of the identification units to the impedance of the external device is constant.
6. A terminal according to claim 1, characterized in that the identification unit comprises an impedance measurement chip comprising a digital integrated circuit implemented by means of an FPGA.
7. The terminal of claim 1, wherein the external device comprises: an HDMI device power adapter and/or a USB flash drive.
8. The terminal of claim 1, wherein the processor is an SOC or a CPU.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021280882.9U CN212569763U (en) | 2020-07-02 | 2020-07-02 | Terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021280882.9U CN212569763U (en) | 2020-07-02 | 2020-07-02 | Terminal |
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| Publication Number | Publication Date |
|---|---|
| CN212569763U true CN212569763U (en) | 2021-02-19 |
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| CN202021280882.9U Active CN212569763U (en) | 2020-07-02 | 2020-07-02 | Terminal |
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| CN (1) | CN212569763U (en) |
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