CN208819611U - Write-protect circuit, write protector and electrical equipment - Google Patents
Write-protect circuit, write protector and electrical equipment Download PDFInfo
- Publication number
- CN208819611U CN208819611U CN201821237657.XU CN201821237657U CN208819611U CN 208819611 U CN208819611 U CN 208819611U CN 201821237657 U CN201821237657 U CN 201821237657U CN 208819611 U CN208819611 U CN 208819611U
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- Prior art keywords
- write
- protect
- voltage end
- electrically connected
- port
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- 230000001012 protector Effects 0.000 title claims abstract description 17
- 238000010586 diagram Methods 0.000 description 12
- 230000005611 electricity Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000005669 field effect Effects 0.000 description 1
Abstract
The disclosure provides a kind of write-protect circuit, write protector and electrical equipment.Write-protect circuit includes switching sub-circuit, is configured as being electrically connected the write-protect port of chip with first voltage end according to the first driving signal, so that the level of write-protect port is pulled low to the first level, so that the chip enters write state.The disclosure is accordingly controlled by the level of the write-protect port to chip, can quickly change the working condition of chip.
Description
Technical field
This disclosure relates to control field, in particular to a kind of write-protect circuit, write protector and electrical equipment.
Background technique
It, can be to chip by controlling the level height of port write-protect (Write Protect, referred to as: WP) of chip
Writing protection function controlled.
Utility model content
Inventors discovered through research that at present to the write-protect port of chip without extra process, usually directly under
It is pulled to low level, or is pulled to high level.If being directly pulled down to low level, Data within the chip is easy to be tampered, thus
Equipment is caused to be operating abnormally.If directly pull-up is that high level is needed to remove and provided when needing that data are written into chip
High level, which increase the complexities of operation.
For this purpose, the disclosure provide it is a kind of can be to the scheme that chip write-protect state is switched fast.
According to the one aspect of one or more other embodiments of the present disclosure, a kind of write-protect circuit is provided, comprising: switching
Circuit is configured as being electrically connected the write-protect port of chip with first voltage end according to the first driving signal, so as to will be described
The level of write-protect port is pulled low to the first level.
In some embodiments, switching sub-circuit is additionally configured to disconnect the write-protect end according to the second driving signal
Mouth is electrically connected with the first voltage end.
In some embodiments, write-protect circuit further include pull-up sub-circuit, be configured as the write-protect port with
In the case that the first voltage end disconnects, the level of the write-protect port is pulled up to second electrical level, wherein described
First level is less than the second electrical level.
In some embodiments, the pull-up sub-circuit includes pull-up resistor and second voltage end, the pull-up resistor
First end is electrically connected with the second voltage end, and the second end of the pull-up resistor is electrically connected with the write-protect port.
In some embodiments, the switching sub-circuit includes: first switch device, is configured as driving according to described first
Dynamic signal enters on state, is additionally configured to enter off state according to second driving signal；Second switch device, quilt
It is configured in the case where the first switch device is in the conductive state, by the write-protect port and the first voltage end
Electrical connection, be additionally configured in the case where the first switch device enters off state, disconnect the write-protect port with
The electrical connection at the first voltage end.
In some embodiments, the first switch device is switching transistor；The second switch device is relay.
In some embodiments, the relay is configured as the case where the switching transistor enters on state
Under, relay coil obtains electric, and relay normally open closes the switch, so that the write-protect port is electrically connected with the first voltage end
It connects；It is additionally configured in the case where the switching transistor enters off state, relay coil power loss, relay normally open is opened
Shutdown is opened, so that the write-protect port is disconnected with the first voltage end.
In some embodiments, the switching transistor includes first electrode, second electrode and third electrode, and described first
Electrode is electrically connected for receiving the first driving signal or the second driving signal, the second electrode and one end of the relay coil
It connects, the third electrode is electrically connected with the first voltage end；The other end of the relay coil is electrically connected with tertiary voltage end
It connects；One end of the relay normally open switch is electrically connected with the first voltage end, the other end of the relay normally open switch
It is electrically connected with the write-protect port.
According to the other side of one or more other embodiments of the present disclosure, a kind of write protector is provided, including above-mentioned
The write-protect circuit that any embodiment is related to.
In some embodiments, write protector further includes controller, is configured as carrying out write operation to chip
In the case of, Xiang Suoshu write-protect circuit sends the first driving signal.
In some embodiments, the controller is additionally configured to Xiang Suoshu write-protect after said write operates
Circuit sends the second driving signal.
According to the other side of one or more other embodiments of the present disclosure, a kind of electrical equipment is provided, comprising: such as above-mentioned
The write protector that any embodiment is related to.
By the detailed description referring to the drawings to the exemplary embodiment of the disclosure, the other feature of the disclosure and its
Advantage will become apparent.
Detailed description of the invention
In order to illustrate more clearly of the embodiment of the present disclosure or technical solution in the prior art, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Disclosed some embodiments without any creative labor, may be used also for those of ordinary skill in the art
To obtain other drawings based on these drawings.
Fig. 1 is the exemplary block diagram of the write-protect circuit of an embodiment of the present disclosure；
Fig. 2 is the exemplary block diagram of the write-protect circuit of another embodiment of the disclosure；
Fig. 3 is the exemplary block diagram of the write-protect circuit of another embodiment of the disclosure；
Fig. 4 is the exemplary block diagram of the write protector of an embodiment of the present disclosure；
Fig. 5 is the exemplary block diagram of the write protector of another embodiment of the disclosure；
Fig. 6 is the exemplary block diagram of the write-protect circuit of another embodiment of the disclosure.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present disclosure, the technical solution in the embodiment of the present disclosure is carried out clear, complete
Site preparation description, it is clear that described embodiment is only disclosure a part of the embodiment, instead of all the embodiments.Below
Description only actually at least one exemplary embodiment be it is illustrative, never as to the disclosure and its application or making
Any restrictions.Based on the embodiment in the disclosure, those of ordinary skill in the art are not making creative work premise
Under every other embodiment obtained, belong to the disclosure protection range.
Unless specifically stated otherwise, positioned opposite, the digital table of the component and step that otherwise illustrate in these embodiments
Up to the unlimited the scope of the present disclosure processed of formula and numerical value.
Simultaneously, it should be appreciated that for ease of description, the size of various pieces shown in attached drawing is not according to reality
Proportionate relationship draw.
Technology, method and apparatus known to person of ordinary skill in the relevant may be not discussed in detail, but suitable
In the case of, the technology, method and apparatus should be considered as authorizing part of specification.
It is shown here and discuss all examples in, any occurrence should be construed as merely illustratively, without
It is as limitation.Therefore, the other examples of exemplary embodiment can have different values.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, then in subsequent attached drawing does not need that it is further discussed.
Fig. 1 is the exemplary block diagram of the write-protect circuit of an embodiment of the present disclosure.As shown in Figure 1, write-protect circuit 1 wraps
Include switching sub-circuit 11.
Switching sub-circuit 11 is configured as according to the first driving signal, by the write-protect port of chip and first voltage end electricity
Connection, so that the level of write-protect port is pulled low to the first level, so that chip enters write state.
In some embodiments, first voltage end is ground terminal.
In disclosure write-protect circuit provided by the above embodiment, carried out by the level of the write-protect port to chip
Corresponding control, can quickly change the working condition of chip.
Fig. 2 is the exemplary block diagram of the write-protect circuit of another embodiment of the disclosure.The difference of Fig. 2 and Fig. 1 exists
In in the embodiment depicted in figure 2, write-protect circuit 1 further includes pull-up sub-circuit 12.
Switching sub-circuit 11 is additionally configured to disconnect the electricity of write-protect port and first voltage end according to the second driving signal
Connection.
Pull-up sub-circuit 12 is configured as in the case where write-protect port and first voltage end disconnect, by write-protect
The level of port is pulled up to second electrical level, so that chip enters write-protect state, wherein the first level is less than second electrical level.
Fig. 3 is the exemplary block diagram of the write-protect circuit of another embodiment of the disclosure.As shown in figure 3, switching sub-circuit
11 include first switch device Q and second switch device K.
First switch device Q is configured as entering on state according to the first driving signal, is additionally configured to according to second
Driving signal enters off state.
Second switch device K is configured as in the case where first switch device Q is in the conductive state, by write-protect port
WP is electrically connected with first voltage end, is additionally configured in the case where first switch device Q enters off state, and write-protect is disconnected
Port WP is electrically connected with first voltage end.
In some embodiments, first switch device is switching transistor or other can be switched according to driving signal
The switchgear of turn-on and turn-off state.For example, first switch device can be bipolar transistor or field effect transistor.
In some embodiments, second switch device is relay, optocoupler or other switching write-protect port WP and the
The equipment of one voltage end status of electrically connecting.
In some embodiments, as shown in figure 3, pull-up sub-circuit 12 includes pull-up resistor R and second voltage end, pull-up electricity
The first end of resistance R is electrically connected with second voltage end, and the second end of pull-up resistor R is electrically connected with write-protect port WP.It is writing as a result,
In the case that protection port WP and first voltage end disconnect, the level of write-protect port WP can be pulled up to second electrical level,
So that chip enters write-protect state.
In some embodiments, as shown in figure 3, relay K is configured as entering the feelings of on state in switching transistor Q
Under condition, relay coil K1 obtains electric, relay normally open switch K2 closure, so that write-protect port WP is electrically connected with first voltage end
It connects.Relay K is additionally configured in the case where switching transistor Q enters off state, relay coil K1 power loss, relay
Normal open switch K2 is disconnected, so that write-protect port WP is disconnected with first voltage end.
As shown in figure 3, switching transistor Q includes first electrode Q1, second electrode Q2 and third electrode Q3.First electrode Q1
It is electrically connected for receiving the first driving signal or the second driving signal, second electrode Q2 with one end of relay coil K1, third
Electrode Q3 is electrically connected with first voltage end.The other end of relay coil K2 is electrically connected with tertiary voltage end.Relay normally open is opened
The one end for closing K2 is electrically connected with first voltage end, and the other end of relay normally open switch K2 is electrically connected with write-protect port WP.
Fig. 4 is the exemplary block diagram of the write protector of an embodiment of the present disclosure.As shown in figure 4, write protector 2 wraps
Include write-protect circuit 21.Write-protect circuit 21 is the write-protect circuit that Fig. 1 any embodiment into Fig. 3 is related to.It is write by utilizing
Protection circuit excessively accordingly controls the level of the write-protect port of chip, can quickly change the working condition of chip.
Fig. 5 is the exemplary block diagram of the write protector of another embodiment of the disclosure.Compared with embodiment illustrated in fig. 4,
In the embodiment shown in fig. 5, write protector further includes controller 22.
Controller 22 is configured as sending first in the case where carrying out write operation to chip to write-protect circuit 21 and driving
Dynamic signal.
In some embodiments, controller 22 is additionally configured to after write operation, is sent to write-protect circuit 21
Second driving signal.
For example, controller 22 sends the first driving signal when carrying out write operation to chip, to write-protect circuit 21.It writes
The write-protect port WP of chip is electrically connected by protection circuit 21 with ground terminal, and chip enters write mode at this time.Controller 22 exists
After write operation, the second driving signal is sent to write-protect circuit 21.Write-protect circuit 21 is by the write-protect port of chip
WP is disconnected with ground terminal, and the level of the write-protect port WP of chip is pulled up to second electrical level, so that chip be made to enter
Write-protect state.
Fig. 6 is the exemplary block diagram of the write-protect circuit of another embodiment of the disclosure.As shown in fig. 6, controller is DSP
Digital signal processor, chip are storage chip.Controller is connected by the data line interface SDA of data line interface SDAA and chip
It connects, controller is connected by clock interface SCLA with the clock interface SCL of chip.
In some embodiments, controller sends the first driving letter to transistor Q when carrying out write operation to chip
Number.Transistor Q is connected after receiving the first driving signal, and the coil of relay K has electric current to pass through, and relay normally open is caused to be opened
It closes and closes, so that the write-protect port WP of chip is electrically connected with first voltage end.Since first voltage end is ground terminal, thus
The write-protect port WP of chip is low level at this time, and chip enters write mode.
In further embodiments, controller sends the second driving signal to transistor Q after the completion of write operation.It is brilliant
Body pipe Q is turned off after receiving the second driving signal, and the coil of relay K does not have electric current to pass through, and relay normally open is caused to switch
Shutdown, to disconnect the write-protect port WP of chip and the connection of first voltage end electricity.Second voltage end passes through resistance R at this time,
The level of the write-protect port WP of chip is pulled up to second electrical level.Since second electrical level is high level, so that chip be made to enter
Write-protect state.
The disclosure also provides a kind of electrical equipment, has in the electrical equipment as any embodiment is related in fig. 4 to fig. 6
Write-protect circuit.
The disclosure is accordingly controlled by the level of the write-protect port to chip, can quickly change the work of chip
State.
The description of the disclosure is given for the purpose of illustration and description, and is not exhaustively or by the disclosure
It is limited to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.It selects and retouches
Embodiment is stated and be the principle and practical application in order to more preferably illustrate the disclosure, and those skilled in the art is enable to manage
The solution disclosure is to design various embodiments suitable for specific applications with various modifications.
Claims (11)
1. a kind of write-protect circuit characterized by comprising
Switch sub-circuit, be configured as being electrically connected the write-protect port of chip with first voltage end according to the first driving signal,
So that the level of the write-protect port is pulled low to the first level；It is additionally configured to according to the second driving signal, described in disconnection
Write-protect port is electrically connected with the first voltage end.
2. write-protect circuit according to claim 1, which is characterized in that further include:
Sub-circuit is pulled up, is configured as in the case where the write-protect port and the first voltage end disconnect, by institute
The level for stating write-protect port is pulled up to second electrical level, wherein first level is less than the second electrical level.
3. write-protect circuit according to claim 2, which is characterized in that
The pull-up sub-circuit includes pull-up resistor and second voltage end, the first end of the pull-up resistor and the second voltage
End electrical connection, the second end of the pull-up resistor are electrically connected with the write-protect port.
4. write-protect circuit according to claim 1, which is characterized in that the switching sub-circuit includes:
First switch device is configured as entering on state according to first driving signal, be additionally configured to according to
Second driving signal enters off state；
Second switch device is configured as in the case where the first switch device is in the conductive state, by the write-protect
Port is electrically connected with the first voltage end, is additionally configured in the case where the first switch device enters off state,
Disconnect being electrically connected for the write-protect port and the first voltage end.
5. write-protect circuit according to claim 4, which is characterized in that
The first switch device is switching transistor；
The second switch device is relay.
6. write-protect circuit according to claim 5, which is characterized in that
The relay is configured as in the case where the switching transistor enters on state, relay coil obtain it is electric, after
Electric appliance normal open switch closure, so that the write-protect port is electrically connected with the first voltage end；It is additionally configured to open described
In the case that pass transistor enters off state, relay coil power loss, relay normally open switch is disconnected, so that the write-protect
Port is disconnected with the first voltage end.
7. write-protect circuit according to claim 6, which is characterized in that
The switching transistor includes first electrode, second electrode and third electrode, and the first electrode is driven for receiving first
Dynamic signal or the second driving signal, the second electrode are electrically connected with one end of the relay coil, the third electrode and
The first voltage end electrical connection；
The other end of the relay coil is electrically connected with tertiary voltage end；
One end of the relay normally open switch is electrically connected with the first voltage end, the other end of the relay normally open switch
It is electrically connected with the write-protect port.
8. a kind of write protector, which is characterized in that including write-protect circuit such as of any of claims 1-7.
9. write protector according to claim 8, which is characterized in that further include:
Controller is configured as in the case where carrying out write operation to chip, and Xiang Suoshu write-protect circuit sends the first driving
Signal.
10. write protector according to claim 9, which is characterized in that
The controller is additionally configured to after said write operates, and Xiang Suoshu write-protect circuit sends the second driving letter
Number.
11. a kind of electrical equipment, comprising: the write protector as described in any one of claim 8 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821237657.XU CN208819611U (en) | 2018-08-02 | 2018-08-02 | Write-protect circuit, write protector and electrical equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821237657.XU CN208819611U (en) | 2018-08-02 | 2018-08-02 | Write-protect circuit, write protector and electrical equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208819611U true CN208819611U (en) | 2019-05-03 |
Family
ID=66272305
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821237657.XU Withdrawn - After Issue CN208819611U (en) | 2018-08-02 | 2018-08-02 | Write-protect circuit, write protector and electrical equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208819611U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108711440A (en) * | 2018-08-02 | 2018-10-26 | 珠海格力电器股份有限公司 | Write-protect circuit and Write-protection method, write protector and electrical equipment |
| CN108711440B (en) * | 2018-08-02 | 2024-04-30 | 珠海格力电器股份有限公司 | Write protection circuit, write protection method, write protection device and electrical equipment |
-
2018
- 2018-08-02 CN CN201821237657.XU patent/CN208819611U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108711440A (en) * | 2018-08-02 | 2018-10-26 | 珠海格力电器股份有限公司 | Write-protect circuit and Write-protection method, write protector and electrical equipment |
| CN108711440B (en) * | 2018-08-02 | 2024-04-30 | 珠海格力电器股份有限公司 | Write protection circuit, write protection method, write protection device and electrical equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20190503 Effective date of abandoning: 20240430 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20190503 Effective date of abandoning: 20240430 |