CN208172788U - A kind of attachment device based on USB interface - Google Patents
A kind of attachment device based on USB interface Download PDFInfo
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- CN208172788U CN208172788U CN201820540352.XU CN201820540352U CN208172788U CN 208172788 U CN208172788 U CN 208172788U CN 201820540352 U CN201820540352 U CN 201820540352U CN 208172788 U CN208172788 U CN 208172788U
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Abstract
The utility model discloses a kind of attachment devices based on USB interface, including USB interface unit, first switch unit, second switch unit, third switch unit, control unit and storage interface unit；By the way that first switch unit is connected between USB interface unit and control unit, second switch unit and third switch unit are connected between USB interface unit and storage interface unit, and first switch unit, second switch unit and third switch unit are controlled by control unit, it can be improved the success rate of reading data and data write-in.
Description
Technical field
The utility model relates to reading data and technical field of memory more particularly to a kind of connection dresses based on USB interface
It sets.
Background technique
EDID (Extended Display Identification Data, extending display identification data) is a kind of standard
Data format, wherein including the parameter in relation to display and its performance, including supplier information, maximum image size, color are set
Set, manufacturer pre-sets, frequency range, display name and the character string of sequence number etc., EDID information is typically stored in display
In the EEPROM in portion, the prior art mostly passes through the EDID information that display is read at the end PC from EEPROM, shown in Figure 1,
A kind of USB interface EDID reading device that the prior art provides, including the end PC and display, display again include MCU with
EEPROM；The USB interface at the end PC is connected with the USB interface of display by VGA line, includes iic bus, the end PC in USB interface
The EDID information of the display of EEPROM storage is read by iic bus agreement；When the use VGA line connection end PC and display
When, the VGA_5V_DET pin level of USB interface is drawn high by the end PC, and MCU detects that the level of the pin is display after high level
Device can be switched to VGA input channel from local video channel automatically, at this point, the end PC starting iic bus agreement is read in EEPROM
The EDID information of storage.
But the technical solution that the prior art provides detects that the VGA_5V_DET pin level of USB interface becomes in MCU
The USB interface of USB interface and display that the end PC is considered as after high level is fully connected success, can so have the following problems：
In the connection procedure of the USB interface of the USB interface and display at the end PC, if misoperation, it may appear that draw the part of USB interface
Situation on foot first connects, after the pin of part in connection；Such as the VGA_5V_DET pin of USB interface first connects, MCU detection
Level to the pin is high level, if the corresponding pin of iic bus causes the end PC that can not pass through there is no in connection at this time
Iic bus agreement reads the data stored in EEPROM, correspondingly, the end PC can not also be write by iic bus agreement to EEPROM
Enter data, reads data to reduce the end PC and the success rate of data is written.
Utility model content
The purpose of the utility model embodiment is to provide a kind of attachment device based on USB interface, can be improved data reading
Take the success rate with data write-in.
To achieve the goals above, the utility model embodiment adopts the following technical scheme that：It provides a kind of based on USB interface
Attachment device, including USB interface unit, first switch unit, second switch unit, third switch unit, control unit and
Storage interface unit；Wherein,
The USB interface unit with read-write equipment for connecting；
The first switch input terminal of the first switch unit is connect with the first output end of the USB interface unit, institute
The first input end of the first switch output end and described control unit of stating first switch unit connects, the first switch unit
First switch control terminal and described control unit the first control output end connect；
Second input/output of the first switch input/output terminal of the second switch unit and the USB interface unit
First storage input of end connection, the second switch input/output terminal of the second switch unit and the storage interface unit/
Output end connection, the second switch control terminal of the second switch unit and the second control output end of described control unit connect
It connects；
The third input/output of third the switch input/output terminal and the USB interface unit of the third switch unit
End connection, the third switch unit the 4th switch input/output terminal and the storage interface unit second storage input/
Output end connection, the third switch control terminal of the third switch unit and the third control output end of described control unit connect
It connects；
The storage interface unit with storage device for connecting.
Compared with prior art, the utility model embodiment provides a kind of attachment device based on USB interface, pass through by
First switch unit is connected between USB interface unit and control unit, and second switch unit is connected with third switch unit
Between USB interface unit and storage interface unit, and by control unit to first switch unit, second switch unit and the
The control of three switch units realizes the delays time to control to data read signal and data write signal indirectly, can solve existing
Because VGA line and USB interface are not fully connected the problem of successfully leading to not successfully read data and write-in data in technology, from
And improve the success rate of reading data and data write-in.
As an improvement of the above scheme, the first switch unit is first switch tube, and the first switch tube is three poles
Pipe or metal-oxide-semiconductor, the first switch control terminal correspond to the base stage of triode or the grid of metal-oxide-semiconductor.
The utility model embodiment realizes the closure and disconnection of first switch unit by the conducting of switching tube with shutdown, makes
Circuit structure is simple, it is easy to accomplish, and since the conduction voltage drop of triode and metal-oxide-semiconductor is smaller, interference that circuit is generated compared with
It is small.
As an improvement of the above scheme, the second switch unit is second switch, and the second switch is three poles
Pipe or metal-oxide-semiconductor, the second switch control terminal correspond to the base stage of triode or the grid of metal-oxide-semiconductor.
The utility model embodiment realizes the closure and disconnection of second switch unit by the conducting of switching tube with shutdown, makes
Circuit structure is simple, it is easy to accomplish, and since the conduction voltage drop of triode and metal-oxide-semiconductor is smaller, interference that circuit is generated compared with
It is small.
As an improvement of the above scheme, the third switch unit is third switching tube, and the third switching tube is three poles
Pipe or metal-oxide-semiconductor, the third switch control terminal correspond to the base stage of triode or the grid of metal-oxide-semiconductor.
The utility model embodiment realizes the closure and disconnection of third switch unit by the conducting of switching tube with shutdown, makes
Circuit structure is simple, it is easy to accomplish, and since the conduction voltage drop of triode and metal-oxide-semiconductor is smaller, interference that circuit is generated compared with
It is small.
As an improvement of the above scheme, described control unit controls the first switch unit, described for generating respectively
The closure of second switch unit and the third switch unit and first control signal, second control signal and the third control disconnected
Signal processed.
The utility model embodiment generates first control signal, second control signal and third control letter by control unit
The control to first switch unit, second switch unit and third switch unit number is realized respectively, without using others
Control circuit reduces design difficulty and reduces circuit cost.
As an improvement of the above scheme, described control unit MCU, first control output end are the first I/O of MCU
Port, the first port I/O is for exporting the first control signal.
First control signal is output to first switch unit by the port I/O of MCU by the utility model embodiment, thus
Realize the closure and the control of disconnection to first switch unit.
As an improvement of the above scheme, second control output end is the 2nd port I/O of MCU, the 2nd end I/O
Mouth is for exporting the second control signal.
Second control signal is output to second switch unit by the port I/O of MCU by the utility model embodiment, thus
Realize the closure and the control of disconnection to second switch unit.
As an improvement of the above scheme, the third control output end is the 3rd port I/O of MCU, the 3rd end I/O
Mouth is for exporting the third control signal.
Third control signal is output to third switch unit by the port I/O of MCU by the utility model embodiment, thus
Realize the closure and the control of disconnection to third switch unit.
As an improvement of the above scheme, the USB interface unit includes iic bus, and the read-write equipment passes through iic bus
Agreement reads data from the storage device or data is written to the storage device.
The utility model embodiment reads data or write-in data by iic bus agreement, to realize the safety of data
Transmission.
As an improvement of the above scheme, the storage device is EEPROM.
The utility model embodiment uses EEPROM storing data, can modify the number stored in EEPROM by electric signal
According to, and can guarantee that the data stored after power-off will not lose.
Detailed description of the invention
Fig. 1 is a kind of structural block diagram for USB interface EDID reading device that the prior art provides；
Fig. 2 is a kind of structural block diagram for attachment device based on USB interface that the utility model embodiment 1 provides；
Fig. 3 is a kind of circuit diagram for attachment device based on USB interface that the utility model embodiment 2 provides.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without creative efforts
Every other embodiment obtained, fall within the protection scope of the utility model.
It is shown in Figure 2, it is a kind of structure for attachment device based on USB interface that the utility model embodiment 1 provides
Block diagram, the attachment device 10 based on USB interface include USB interface unit 11, first switch unit 12, second switch unit
13, third switch unit 14, control unit 15 and storage interface unit 16；Wherein,
The USB interface unit 11 with read-write equipment 20 for connecting；
First output end of the first switch input terminal of the first switch unit 12 and the USB interface unit 11 connects
It connecing, the first switch output end of the first switch unit 12 is connect with the first input end of described control unit 15, and described
The first switch control terminal of one switch unit 12 is connect with the first control output end of described control unit 15；
Second input of the first switch input/output terminal of the second switch unit 13 and the USB interface unit 11/
Output end connection, the first of the second switch input/output terminal of the second switch unit 13 and the storage interface unit 16
Store input/output terminal connection, the second switch control terminal of the second switch unit 13 and the second of described control unit 15
Control output end connection；
The third switch unit 14 third switch input/output terminal and the USB interface unit 11 third input/
Output end connection, the 4th switch input/output terminal and the second of the storage interface unit 16 of the third switch unit 14
Store input/output terminal connection, the third switch control terminal of the third switch unit 14 and the third of described control unit 15
Control output end connection；
The storage interface unit 16 with storage device 30 for connecting.
In the present embodiment, default first switch unit 12, second switch unit 13 and third switch unit 14 to disconnect,
First switch unit 12 is controlled by control unit 15 first to be closed；When USB interface unit 11 is connect with read-write equipment 20,
The signal of the first output end output of USB interface unit 11 is sent to the first defeated of control unit 15 by first switch unit 12
Enter end；When control unit 15 receives the signal, control first switch unit 12 is disconnected, and (is prolonged by certain delay time
When the time set according to actual needs) after, pass through control unit 15 control first switch unit 12, second switch unit
13 and third switch unit 14 be closed；When control unit 15 receives the first output end output of USB interface unit 11 again
Signal when, since USB interface unit 11 passes through second switch unit 13 and third switch unit 14 and storage interface unit 16
Connection, storage interface unit 16 are connect with storage device 30, and therefore, read-write equipment 20 reads storage by USB interface unit 11
The data that store in device 30 are written data to storage device 30 and are stored.
It should be noted that when read-write equipment 20 passes through the data stored in 11 read storage device 30 of USB interface unit
When, the first switch input/output terminal of second switch unit 13 is as second switch output end, second switch input/output terminal
As second switch input terminal；The third switch input/output terminal of third switch unit 14 is as third output switching terminal, and the 4th
Switch input/output terminal is third switch input terminal；When read-write equipment 20 is written by USB interface unit 11 to storage device 30
When data are stored, the first switch input/output terminal of second switch unit 13 is as second switch input terminal, second switch
Input/output terminal is as second switch output end；The third switch input/output terminal of third switch unit 14 is switched as third
Input terminal, the 4th switch input/output terminal is third output switching terminal.
It should be understood that second switch unit 13 and third switch unit 14 by closing again after certain delay time
It closes, has reserved the regular hour for the attended operation of USB interface unit 11 and read-write equipment 20, also to read-write equipment 20 to storage
The data read signal or data write signal that device 30 is sent have carried out certain delay, therefore, avoid USB interface unit
11 read-write equipments 20 when not being fully connected successfully with read-write equipment 20 are just by 11 read storage device 30 of USB interface unit
The data of storage or to storage device 30 be written data the case where occur.
A kind of attachment device based on USB interface provided by the utility model embodiment, by by first switch unit
It is connected between USB interface unit and control unit, second switch unit and third switch unit is connected to USB interface unit
Between storage interface unit, and by control unit to first switch unit, second switch unit and third switch unit
Control realizes the delays time to control to data read signal and data write signal indirectly, solves in the prior art because of VGA line
The problem of successfully leading to not successfully read data and write-in data is not fully connected with USB interface, to improve data
Read the success rate with data write-in.
In a preferred embodiment, the first switch unit is first switch tube, and the first switch tube is three poles
Pipe or metal-oxide-semiconductor, the first switch control terminal correspond to the base stage of triode or the grid of metal-oxide-semiconductor.
In the present embodiment, switching tube is as first switch unit, when switching tube is NPN type triode, first switch
The first switch input terminal of unit is the collector of NPN type triode, and first switch output end is the transmitting of NPN type triode
Pole, first switch control terminal are the base stage of NPN type triode；When switching tube is N-channel MOS pipe, the of first switch unit
One switch input terminal is the drain electrode of N-channel MOS pipe, and first switch output end is the source electrode of N-channel MOS pipe, first switch control
End is the grid of N-channel MOS pipe；The case where switching tube is PNP type triode and switching tube is P-channel metal-oxide-semiconductor similarly, here not
It repeats again.
A kind of attachment device based on USB interface provided by the utility model embodiment, by the conducting of switching tube with
The closure and disconnection of first switch unit are realized in shutdown, keep circuit structure simple, it is easy to accomplish, and due to triode and MOS
The conduction voltage drop of pipe is smaller, and the interference generated to circuit is smaller.
In a further advantageous embodiment, the second switch unit is second switch, and the second switch is three
Pole pipe or metal-oxide-semiconductor, the second switch control terminal correspond to the base stage of triode or the grid of metal-oxide-semiconductor.
In the present embodiment, switching tube is as second switch unit, when read-write equipment reads storage by USB interface unit
When the data stored in device, if switching tube is NPN type triode, the first switch input/output terminal of second switch unit
For the emitter of NPN type triode, second switch input/output terminal is the collector of NPN type triode, second switch control terminal
For the base stage of NPN type triode；If switching tube is N-channel MOS pipe, the first switch input/output terminal of second switch unit
For the source electrode of N-channel MOS pipe, second switch input/output terminal is the drain electrode of N-channel MOS pipe, and second switch control terminal is N ditch
The grid of road metal-oxide-semiconductor；When data, which are written, to storage device by USB interface unit in read-write equipment is stored, if switching tube
For NPN type triode, then the first switch input/output terminal of second switch unit is the collector of NPN type triode, and second opens
The emitter that input/output terminal is NPN type triode is closed, second switch control terminal is the base stage of NPN type triode；If switching tube
For N-channel MOS pipe, then the first switch input/output terminal of second switch unit is the drain electrode of N-channel MOS pipe, and second switch is defeated
Enter/output end be N-channel MOS pipe source electrode, second switch control terminal be N-channel MOS pipe grid；Switching tube is positive-negative-positive three
Similarly, which is not described herein again for the case where pole pipe and switching tube are P-channel metal-oxide-semiconductor.
A kind of attachment device based on USB interface provided by the utility model embodiment, by the conducting of switching tube with
The closure and disconnection of second switch unit are realized in shutdown, keep circuit structure simple, it is easy to accomplish, and due to triode and MOS
The conduction voltage drop of pipe is smaller, and the interference generated to circuit is smaller.
In another preferred embodiment, the third switch unit is third switching tube, and the third switching tube is three
Pole pipe or metal-oxide-semiconductor, the third switch control terminal correspond to the base stage of triode or the grid of metal-oxide-semiconductor.
In the present embodiment, switching tube is as third switch unit, when read-write equipment reads storage by USB interface unit
When the data stored in device, if switching tube is NPN type triode, the third of third switch unit switchs input/output terminal
For the emitter of NPN type triode, the 4th switch input/output terminal is the collector of NPN type triode, third switch control terminal
For the base stage of NPN type triode；If switching tube is N-channel MOS pipe, the third of third switch unit switchs input/output terminal
For the source electrode of N-channel MOS pipe, the 4th switch input/output terminal is the drain electrode of N-channel MOS pipe, and third switch control terminal is N ditch
The grid of road metal-oxide-semiconductor；When data, which are written, to storage device by USB interface unit in read-write equipment is stored, if switching tube
For NPN type triode, then the third switch input/output terminal of third switch unit is the collector of NPN type triode, and the 4th opens
The emitter that input/output terminal is NPN type triode is closed, third switch control terminal is the base stage of NPN type triode；If switching tube
For N-channel MOS pipe, then the third switch input/output terminal of third switch unit is the drain electrode of N-channel MOS pipe, and the 4th switch is defeated
Enter/output end be N-channel MOS pipe source electrode, third switch control terminal be N-channel MOS pipe grid；Switching tube is positive-negative-positive three
Similarly, which is not described herein again for the case where pole pipe and switching tube are P-channel metal-oxide-semiconductor.
A kind of attachment device based on USB interface provided by the utility model embodiment, by the conducting of switching tube with
The closure and disconnection of third switch unit are realized in shutdown, keep circuit structure simple, it is easy to accomplish, and due to triode and MOS
The conduction voltage drop of pipe is smaller, and the interference generated to circuit is smaller.
In another preferred embodiment, described control unit controls the first switch unit, institute for generating respectively
State the closure and first control signal, second control signal and the third of disconnection of second switch unit and the third switch unit
Control signal.
In the present embodiment, control unit generates first control signal, and is output to by the first control output end and the
The first switch control terminal of one control output end connection, when first switch control terminal receives first control signal, according to the
The closure and disconnection of one control signal control first switch unit；Control unit generates second control signal, and passes through the second control
Output end processed is output to the second switch control terminal connecting with the second control output end, when second switch control terminal receives second
When controlling signal, the closure and disconnection of second switch unit are controlled according to second control signal；Control unit generates third control
Signal, and the third switch control terminal connecting with third control output end is output to by third control output end, when third is opened
When pass control terminal receives third control signal, the closure and disconnection of signal control third switch unit are controlled according to third.
A kind of attachment device based on USB interface provided by the utility model embodiment generates the by control unit
One control signal, second control signal and third control signal are realized respectively to first switch unit, second switch unit and the
The control of three switch units, without using other control circuits, reducing design difficulty and reducing circuit cost.
In another preferred embodiment, described control unit MCU, first control output end is the first of MCU
The port I/O, the first port I/O is for exporting the first control signal.
In the present embodiment, MCU is as control unit, and as the first control output end, MCU is raw for a port I/O of MCU
It is output to the first switch control terminal connecting with the port I/O at first control signal, and by the port I/O, is opened when first
When pass control terminal receives first control signal, the closure and disconnection of first switch unit are controlled according to first control signal.
A kind of attachment device based on USB interface provided by the utility model embodiment, will by the port I/O of MCU
First control signal is output to first switch unit, to realize the closure and the control of disconnection to first switch unit.
In another preferred embodiment, second control output end is the 2nd port I/O of MCU, the 2nd I/O
Port is for exporting the second control signal.
In the present embodiment, a port I/O of MCU generates second control signal as the second control output end, MCU,
And the second switch control terminal connecting with the port I/O is output to by the port I/O, when second switch control terminal receives
When two control signals, the closure and disconnection of second switch unit are controlled according to second control signal.
A kind of attachment device based on USB interface provided by the utility model embodiment, will by the port I/O of MCU
Second control signal is output to second switch unit, to realize the closure and the control of disconnection to second switch unit.
In another preferred embodiment, the third control output end is the 3rd port I/O of MCU, the 3rd I/O
Port is for exporting the third control signal.
In the present embodiment, a port I/O of MCU generates third and controls signal as third control output end, MCU,
And the third switch control terminal connecting with the port I/O is output to by the port I/O, when third switch control terminal receives
When three control signals, the closure and disconnection of signal control third switch unit are controlled according to third.
A kind of attachment device based on USB interface provided by the utility model embodiment, will by the port I/O of MCU
Third control signal is output to third switch unit, to realize the closure and the control of disconnection to third switch unit.
In another preferred embodiment, the USB interface unit includes iic bus, and the read-write equipment is total by IIC
Wire protocol reads data from the storage device or data is written to the storage device.
In the present embodiment, iic bus includes data line and clock line, the first switch input of second switch unit/defeated
Outlet is connect by data line with the second input/output terminal of USB interface unit, and second switch input/output terminal passes through data
First storage input/output terminal connection of line and storage interface unit；The third switch input/output terminal of third switch unit is logical
Oversampling clock line is connect with the third input/output terminal of USB interface unit, and the 4th switch input/output terminal passes through clock line and deposits
Store up the second storage input/output terminal connection of interface unit.
When second switch unit and third switch unit are closed, read-write equipment is by iic bus and according to iic bus
The data that store in agreement read storage device are stored to storage device write-in data.
A kind of attachment device based on USB interface, is read by iic bus agreement provided by the utility model embodiment
Data or write-in data, to realize the safe transmission of data.
In another preferred embodiment, the storage device is EEPROM.
In the present embodiment, EEPROM is as storage device, and for storing data, read-write equipment passes through USB interface unit
It reads the data stored in EEPROM or is stored to EEPROM write-in data.
A kind of attachment device based on USB interface provided by the utility model embodiment, using EEPROM storing data,
The data stored in EEPROM can be modified by electric signal, and can guarantee that the data stored after power-off will not lose.
It is shown in Figure 3, it is a kind of circuit for attachment device based on USB interface that the utility model embodiment 2 provides
Figure, the USB interface unit of the attachment device correspond to USB interface, and first switch unit corresponds to metal-oxide-semiconductor 1, second switch unit
Metal-oxide-semiconductor 2 is corresponded to, third switch unit corresponds to metal-oxide-semiconductor 3 (metal-oxide-semiconductor in the present embodiment is specially N-channel MOS pipe), control
Unit corresponds to MCU, and storage interface unit corresponds to IIC interface, and reading device corresponds to PC machine, and storage device corresponds to
EEPROM。
USB interface and PC machine are attached by VGA line, and IIC interface is the IIC interface of EEPROM, and EEPROM is here
EEPROM in piece can set the general port I/O to IIC interface, and metal-oxide-semiconductor 1, metal-oxide-semiconductor 2 and metal-oxide-semiconductor 3 are in shutdown shape
State.
Firstly, MCU generates first control signal and is sent to the grid of metal-oxide-semiconductor 1 by the port I/O1 of MCU, to make
Metal-oxide-semiconductor 1 is connected；When USB interface is connect with PC machine by VGA line, the first output end of USB interface (such as USB interface
VGA_5V_DET pin) level drawn high by PC machine, export a high level signal, which is sent by metal-oxide-semiconductor 1
To the port I/O4 of MCU；When MCU detects the high level signal of the port I/O4, control metal-oxide-semiconductor 1 is turned off, at this time VGA_5V_
The high level signal of DET pin will not be detected, and after certain delay time, MCU generates first control signal, the
Two control signals and third control signal are simultaneously sent to accordingly by the port I/O1 of MCU, the port I/O2 and the port I/O3 respectively
The grid of metal-oxide-semiconductor 1, the grid of metal-oxide-semiconductor 2 and metal-oxide-semiconductor 3 grid, so that metal-oxide-semiconductor 1, metal-oxide-semiconductor 2 and metal-oxide-semiconductor 3 be made to be both turned on；
When MCU detects the high level signal for the VGA_5V_DET pin output that the port I/O4 receives again, PC machine is believed by IIC
It number shakes hands with EEPROM initiation, and sends data read signal and read the data that store in EEPROM or send data write signal
It is stored to EEPROM write-in data.
A kind of attachment device based on USB interface provided by the utility model embodiment, by MCU to 2 He of metal-oxide-semiconductor
The control of the conducting and shutdown of metal-oxide-semiconductor 3, realizes the delays time to control to IIC signal indirectly, connects so as to avoid VGA line and VGA
Mouth is not fully connected successfully the data stored in just starting IIC signal-obtaining EEPROM or leads to nothing to EEPROM write-in data
Method successfully reads the problem of data and write-in data, and then improves the success rate that PC machine carries out reading data and data write-in；
On the other hand, when MCU detects the high level signal of VGA_5V_DET pin output of USB interface, metal-oxide-semiconductor 2 and MOS are controlled
Pipe 3 is connected, so that power supply is provided by PC machine for EEPROM, to ensure that the reliability of power supply.
The above is only the preferred embodiment of the utility model, it is noted that for the common skill of the art
For art personnel, without deviating from the technical principle of the utility model, several improvement and replacement can also be made, these change
It also should be regarded as the protection scope of the utility model into replacement.
Claims (10)
1. a kind of attachment device based on USB interface, which is characterized in that including USB interface unit, first switch unit, second
Switch unit, third switch unit, control unit and storage interface unit；Wherein,
The USB interface unit with read-write equipment for connecting；
The first switch input terminal of the first switch unit is connect with the first output end of the USB interface unit, and described
The first switch output end of one switch unit and the first input end of described control unit connect, and the of the first switch unit
The connection of first control output end of one switch control terminal and described control unit；
The first switch input/output terminal of the second switch unit and the second input/output terminal of the USB interface unit connect
It connects, the first storage input/output of the second switch input/output terminal and the storage interface unit of the second switch unit
End connection, the second switch control terminal of the second switch unit and the second control output end of described control unit connect；
The third switch input/output terminal of the third switch unit and the third input/output terminal of the USB interface unit connect
It connects, the second storage input/output of the 4th switch input/output terminal and the storage interface unit of the third switch unit
End connection, the third switch control terminal of the third switch unit and the third control output end of described control unit connect；
The storage interface unit with storage device for connecting.
2. as described in claim 1 based on the attachment device of USB interface, which is characterized in that the first switch unit is the
One switching tube, the first switch tube be triode or metal-oxide-semiconductor, the first switch control terminal correspond to triode base stage or
The grid of metal-oxide-semiconductor.
3. as described in claim 1 based on the attachment device of USB interface, which is characterized in that the second switch unit is the
Two switching tubes, the second switch be triode or metal-oxide-semiconductor, the second switch control terminal correspond to triode base stage or
The grid of metal-oxide-semiconductor.
4. as described in claim 1 based on the attachment device of USB interface, which is characterized in that the third switch unit is the
Three switching tubes, the third switching tube be triode or metal-oxide-semiconductor, the third switch control terminal correspond to triode base stage or
The grid of metal-oxide-semiconductor.
5. as described in claim 1 based on the attachment device of USB interface, which is characterized in that described control unit is for generating
The closure and the first of disconnection of the first switch unit, the second switch unit and the third switch unit is controlled respectively
It controls signal, second control signal and third and controls signal.
6. as claimed in claim 5 based on the attachment device of USB interface, which is characterized in that described control unit MCU, institute
The first port I/O that the first control output end is MCU is stated, the first port I/O is for exporting the first control signal.
7. as claimed in claim 6 based on the attachment device of USB interface, which is characterized in that second control output end is
The 2nd port I/O of MCU, the 2nd port I/O is for exporting the second control signal.
8. as claimed in claim 7 based on the attachment device of USB interface, which is characterized in that the third control output end is
The 3rd port I/O of MCU, the 3rd port I/O is for exporting the third control signal.
9. as described in claim 1 based on the attachment device of USB interface, which is characterized in that the USB interface unit includes
Iic bus, the read-write equipment read data from the storage device by iic bus agreement or are written to the storage device
Data.
10. as described in claim 1 based on the attachment device of USB interface, which is characterized in that the storage device is
EEPROM。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820540352.XU CN208172788U (en) | 2018-04-16 | 2018-04-16 | A kind of attachment device based on USB interface |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820540352.XU CN208172788U (en) | 2018-04-16 | 2018-04-16 | A kind of attachment device based on USB interface |
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| CN208172788U true CN208172788U (en) | 2018-11-30 |
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| CN201820540352.XU Active CN208172788U (en) | 2018-04-16 | 2018-04-16 | A kind of attachment device based on USB interface |
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