CN108173560A - A kind of deck anti-static circuit and electronic equipment - Google Patents
A kind of deck anti-static circuit and electronic equipment Download PDFInfo
- Publication number
- CN108173560A CN108173560A CN201810096909.XA CN201810096909A CN108173560A CN 108173560 A CN108173560 A CN 108173560A CN 201810096909 A CN201810096909 A CN 201810096909A CN 108173560 A CN108173560 A CN 108173560A
- Authority
- CN
- China
- Prior art keywords
- card
- state
- deck
- switching circuit
- processor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/3816—Mechanical arrangements for accommodating identification devices, e.g. cards or chips; with connectors for programming identification devices
- H04B1/3818—Arrangements for facilitating insertion or removal of identification devices
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/3816—Mechanical arrangements for accommodating identification devices, e.g. cards or chips; with connectors for programming identification devices
Abstract
The present invention provides a kind of deck anti-static circuit and electronic equipment, including：Deck；Communication connections and detection circuit are equipped between processor, with the deck, wherein, the switching circuit of ground connection is parallel on each communication connections, the control terminal of the switching circuit is connected to the control interface of the processor；When the processor has card-like state and during without switching between card-like state by what the detection circuit detected the deck; the processor output drive signal is to the switching circuit; control the off-state of the switching circuit and the switching of closed state; electrostatic is avoided to be transferred on CPU by each communication connections, it is ensured that phenomena such as exception for crashing, restarting or damage will not occur because of the electrostatic of plug-in card in CPU.
Description
Technical field
The present invention relates to field of electronic devices more particularly to a kind of deck anti-static circuits and electronic equipment.
Background technology
In daily life, mobile phone etc. has the function of that the insertion that card is needed in the electronic equipment of plug-in card is operated with extracting,
Such as SIM (Subscriber Identification Module, user identity identification) blocks and TF card (Trans-flash
Card, portable memory card).
Due to these cards, the component part of itself can include plastic cement and pad, during plug-in card, the plastic part of card
Divide and can generate electrostatic during golden finger (pad) friction of deck in mobile phone, electrostatic can pass through the communication connection between card and CPU
Circuit is transmitted to mobile phone CPU, and mobile phone is led to problems such as to generate and crashed, restarted or damage.
Invention content
The embodiment of the present invention provides a kind of deck anti-static circuit and electronic equipment, to solve in existing electrostatic prevention structure
It still suffers from partial electrostatic and is transmitted to CPU, electronic equipment is caused abnormal the problem of even damaging occur.
In order to solve the above-mentioned technical problem, the invention is realized in this way：
In a first aspect, an embodiment of the present invention provides a kind of deck anti-static circuit, including：
Deck；
Communication connections and detection circuit are equipped between processor, with the deck, wherein, each communication link wiring
Road is parallel with the switching circuit of ground connection, and the control terminal of the switching circuit is connected to the control interface of the processor；
When the processor has card-like state and without cutting between card-like state by what the detection circuit detected the deck
When changing, the processor output drive signal to the switching circuit controls the off-state and closed form of the switching circuit
The switching of state.
Second aspect, an embodiment of the present invention provides a kind of electronic equipment, including deck anti-static circuit as described above.
In embodiments of the present invention, by being parallel with the switching circuit of ground connection on each communication connections, the switch
Circuit is connect with processor, and detects there is card-like state on deck and during without switching between card-like state in processor, control switch
Circuit switches between off-state and closed state, realizes and is grounded when the switching circuit switches to off-state by closed state
Circuit disconnects, and realizes the transmission of the normal communications signal between the card and CPU in deck, is cut in the switching circuit by off-state
Ground path is connected when shifting to closed state, releases to the static guiding that plug-in card on deck is generated, avoids electrostatic by each communication
Connection circuit is transferred on CPU, it is ensured that the exception for crashing, restarting or damage etc. will not occur because of the electrostatic of plug-in card in CPU
Phenomenon.
Description of the drawings
Fig. 1 shows the circuit structure diagrams of deck anti-static circuit in the embodiment of the present invention；
In Fig. 2 expression embodiment of the present invention in deck anti-static circuit between contact portion and communication connections and ground path
Connection structure diagram.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is part of the embodiment of the present invention, instead of all the embodiments.Based on this hair
Embodiment in bright, the every other implementation that those of ordinary skill in the art are obtained without creative efforts
Example, shall fall within the protection scope of the present invention.
A kind of deck anti-static circuit disclosed in the embodiment of the present invention, as shown in Figure 1, Figure 2, including：
Deck；Communication connections and detection circuit L are equipped between processor, with the deck, wherein, each communication
Connecting line road is parallel with the switching circuit of ground connection, and the control that the control terminal of the switching circuit is connected to the processor connects
Mouthful.
When the processor has card-like state and without cutting between card-like state by what the detection circuit L detected the deck
When changing, the processor output drive signal to the switching circuit controls the off-state and closed form of the switching circuit
The switching of state.
Wherein, detection circuit L is to realize the circuit being detected to whetheing there is plug-in card in deck, can be specifically deck point
Not have card-like state and without card-like state under to detection circuit L export different feedback signal such as low and high level so that processor
The detection switched between different conditions on deck by detection circuit L realizations, it is specifically, in parallel on the communication connections
One end of switching circuit be ground connection, the other end is connected to one end that communication connections are connected with processor, and control terminal is then
It is connect with the control interface of processor, realizes that processor controls the break-make of switching circuit.
As shown in Figure 1, the communication line is particularly used for what signal between the card and processor inserted in realization deck transmitted
Circuit, which can specifically include the circuit for transmitting data-signal (DATA), for transmitting clock signal (CLK)
Deng circuit.The ground terminal of the switching circuit is connected to the ground path of mainboard.
The switching circuit of ground connection is parallel on each communication connections, it is as shown in Figures 1 and 2, each logical on deck
Letter connecting line road is connected in parallel to switching circuit G1, G2 and G3 respectively, the enable port En of those switching circuits and processor
Connection, and detect there is card-like state on deck and during without switching between card-like state in processor, pass through enable port En output controls
Signal processed switching circuit to be controlled to switch between off-state and closed state, is switched in the switching circuit by off-state
Ground path is connected during closed state, releases to the static guiding that plug-in card on deck is generated, avoids electrostatic by each communication connection
Circuit is transferred on CPU, it is ensured that and phenomena such as exception for crashing, restarting or damage will not occur because of the electrostatic of plug-in card in CPU,
When switching circuit switches to off-state by closed state, ground path disconnects, between the card and CPU in realization deck just
The transmission of normal signal of communication.
Specifically, wherein, when deck is in and has card-like state, the switching circuit is off-state；Alternatively, the deck
During in no card-like state, the switching circuit is closed state.
I.e. deck has that card-like state is corresponding with the off-state of switching circuit, deck without card-like state and switching circuit
Closed state is corresponding, and when deck has switched to card-like state by no card-like state, switching circuit switches to disconnection by closed state
State, when deck is by there is card-like state to switch to no card-like state, switching circuit switches to closed state by off-state.
When deck is in no card-like state, ground path is connected after switching circuit is closed, at any time to that will inject the card come
The electrostatic that can be generated is released, when be stuck in plugged together on deck after, then deck has switched to card-like state, needs to open at this time
The closed state on powered-down road switches to off-state, so that ground path disconnects, communication connections normal work realizes deck
The transmission of signal between the card and CPU of upper grafting.
Preferably, the detection circuit is connect with the interrupt pin of the deck；In the deck by there is the switching of card-like state
During to no card-like state, the output level of the interrupt pin switches to low level by high level；Alternatively, in the deck by no card
When state has switched to card-like state, the output level of the interrupt pin switches to high level by low level.
The processor detects that the output level of the interrupt pin of the deck is cut by high level by the detection circuit
Low level is shifted to, determines the deck by there is card-like state to switch to no card-like state；The processor is examined by the detection circuit
The output level for measuring the interrupt pin of the deck switches to high level by low level, determines that the deck is cut by no card-like state
Card-like state is shifted to.
Processor is realizing there is card-like state and during without switching between card-like state to deck by detection circuit, specifically can be with
It is that interrupt level changes corresponding plug card motion in configured in advance deck, when interrupt level is high level, it is determined that deck
To there is card-like state, when interrupt level is low level, it is determined that deck is no card-like state, and realizes the height by being exported to deck
Low level switching has card and the switching of no card-like state determine deck, simple easy realization.
Further, accordingly, when the deck has switched to card-like state by no card-like state, the high electricity of processor output
It puts down to the control terminal of the switching circuit, the switching circuit switches to closed state by off-state；Alternatively, the deck by
When having the card-like state to switch to no card-like state, the processor exports low level to the control terminal of the switching circuit, the switch
Circuit switches to off-state by closed state.
The processor detects the deck by when having the card-like state to switch to no card-like state by the detection circuit, output
High level controls the switching circuit to switch to closed state by off-state；The processor is examined by the detection circuit
When measuring the deck and having switched to card-like state by no card-like state, low level is exported, controls the switching circuit by closed state
Switch to off-state.
Processor is having card and switching without card-like state according to the deck that detects, to realize the disconnection to switching circuit
Can be specifically the on-off line operation of the corresponding switching circuit of low and high level of configured in advance output with the control of closure, it is simple easy
It realizes.
Preferably, at least one contact portion for being connected with card is provided on the deck, each contact portion is equal
The processor is connected to by communication connections described in one group.
Communication connections are respectively connected in each contact portion, are realized when card insertion enters and connect in deck with contact portion, are blocked
The interaction of middle information and information in processor, as shown in Fig. 2, being all provided on each communication connections being connected with contact portion
Switching circuit in parallel is put, CPU is imported from any connecting line road to avoid electrostatic, thoroughly avoids the feelings that CPU is abnormal or damages
Condition occurs.Specifically, which can include：First for being connect with SIM card touches
Point portion or the second contact portion for being connect with TF card.
Specifically, which is NMOS tube, and the control terminal of the switching circuit is the grid of the NMOS tube, preferably
Ground, the grid of each NMOS tube are connected to the same control interface in the processor, to realize CPU to all
Switching circuit carries out consistent control at the same time.
When being inserted into SIM card on deck or during TF card, on the communication network between SIM card or TF card and CPU and a NMOS
GND (mainboard) is managed, makes switching circuit, NMOS tube is conducting to GND when plugging SIM card or TF card, is connect with NMOS tube conducting
Enter GND, i.e. communication network between SIM card or TF card and CPU and GND network shorts, plug electrostatic quilt caused by SIM card or TF card
GND absorbs, and such electrostatic will not be transmitted to CPU, and NMOS tube technology is very ripe, and cost comes down a bit with respect to ESD protective device,
After NMOS tube conducting, network is and GND short circuits, NMOS tube distributional condition on pcb board are looser.
On the all-network to communicate in above-mentioned implementation process in SIM card or TF card with CPU and a NMOS tube is (main to GND
Plate), switching circuit is made, the grid of all NMOS tubes connects same GPIO mouthfuls and enables, when SIM card or TF card plug, SIM
Card and the interruption foot level of TF card seat can change, i.e. CPU can detect interrupt level variation do the conducting of enabled NMOS tube and
Closedown condition, you can to play on-off action, communication network between SIM card or TF card and CPU can be with GND network shorts or disconnected
It opens.
Such as after plugging SIM card or TF card, the interruption foot level of SIM card and TF card seat is high level, extracts SIM card or TF
After card, the interruption foot level of SIM card and TF card seat is low level；CPU detects SIM card and the interruption foot level of TF card seat is always
Low level judges that SIM card or TF card are not inserted into deck, judge deck without card, and NMOS tube is connected in CPU output high level,
Communication network i.e. between SIM card or TF card and CPU is shorted to GND, you can is generated with absorption insertion SIM card or TF card quiet
Electricity.
When being inserted into SIM card or TF card, the interruption foot level of CPU detection SIM cards and TF card seat becomes high electricity from low level
Flat variation judges have SIM card or TF card to be inserted into, CPU output low levels close NMOS tube, SIM card or TF card and CPU
Communicate all-network normal communication.
Interrupt level is detected, is high level when detecting level, judges that deck has card, CPU output low levels close NMOS tube
Close, then detect interrupt level variation, when extracting SIM card or during TF card, the interruption foot level of CPU detection SIM cards and TF card seat by
High level becomes low level variation, that is, judges have SIM card or TF card to extract, and CPU output high level is connected NMOS tube, SIM
Card or TF card and CPU communication all-networks are shorted to GND, you can extract the electrostatic that SIM card or TF card generate to absorb.
A kind of electronic equipment is also disclosed in the embodiment of the present invention, including deck anti-static circuit as described above, it is ensured that CPU is not
Phenomena such as exception for crashing, restarting or damage can occur because of the electrostatic of plug-in card.
Wherein, the electronic equipment can be but not limited to mobile phone, tablet computer, phone wrist-watch etc. with deck, have
The electronic equipment of plug-in card function.
It should be noted that herein, term " comprising ", "comprising" or its any other variant are intended to non-row
His property includes, so that process, method, article or device including a series of elements not only include those elements, and
And it further includes other elements that are not explicitly listed or further includes intrinsic for this process, method, article or device institute
Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including this
Also there are other identical elements in the process of element, method, article or device.
Through the above description of the embodiments, those skilled in the art can be understood that above-described embodiment side
Method can add the mode of required general hardware platform to realize by software, naturally it is also possible to by hardware, but in many cases
The former is more preferably embodiment.Based on such understanding, technical scheme of the present invention substantially in other words does the prior art
Going out the part of contribution can be embodied in the form of software product, which is stored in a storage medium
In (such as ROM/RAM, magnetic disc, CD), used including some instructions so that a station terminal (can be mobile phone, computer services
Device, air conditioner or network equipment etc.) perform method described in each embodiment of the present invention.
The embodiment of the present invention is described above in conjunction with attached drawing, but the invention is not limited in above-mentioned specific
Embodiment, above-mentioned specific embodiment is only schematical rather than restricted, those of ordinary skill in the art
Under the enlightenment of the present invention, present inventive concept and scope of the claimed protection are not being departed from, can also made very much
Form is belonged within the protection of the present invention.
Above-described is the preferred embodiment of the present invention, it should be pointed out that the ordinary person of the art is come
It says, several improvements and modifications can also be made under the premise of principle of the present invention is not departed from, these improvements and modifications also exist
In protection scope of the present invention.
Claims (8)
1. a kind of deck anti-static circuit, which is characterized in that including：
Deck；
Communication connections and detection circuit are equipped between processor, with the deck, wherein, on each communication connections
The switching circuit of ground connection is parallel with, the control terminal of the switching circuit is connected to the control interface of the processor；
When the processor has card-like state and during without switching between card-like state by what the detection circuit detected the deck,
The processor output drive signal controls the off-state of the switching circuit and cutting for closed state to the switching circuit
It changes.
2. deck anti-static circuit according to claim 1, which is characterized in that the deck is in when having card-like state, institute
Switching circuit is stated as off-state；Alternatively, when the deck is in no card-like state, the switching circuit is closed state.
3. deck anti-static circuit according to claim 1, which is characterized in that
The detection circuit is connect with the interrupt pin of the deck；
When the deck is by there is card-like state to switch to no card-like state, the output level of the interrupt pin is switched to by high level
Low level；Alternatively, when the deck has switched to card-like state by no card-like state, the output level of the interrupt pin is by low electricity
Truncation shifts to high level.
4. deck anti-static circuit according to any one of claims 1 to 3, which is characterized in that
When the deck has switched to card-like state by no card-like state, the processor exports control of the high level to the switching circuit
End processed, the switching circuit switch to closed state by off-state；Alternatively,
The deck is by when having the card-like state to switch to no card-like state, the processor exports control of the low level to the switching circuit
End processed, the switching circuit switch to off-state by closed state.
5. deck anti-static circuit according to claim 1, which is characterized in that
At least one contact portion for being connected with card is provided on the deck, each contact portion is by described in one group
Communication connections are connected to the processor.
6. deck anti-static circuit according to claim 1, which is characterized in that the switching circuit is NMOS tube, described
The control terminal of switching circuit is the grid of the NMOS tube.
7. deck anti-static circuit according to claim 6, which is characterized in that the grid of each NMOS tube is all connected with
Same control interface into the processor.
8. a kind of electronic equipment, which is characterized in that including deck anti-static circuit as described in any one of claim 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810096909.XA CN108173560A (en) | 2018-01-31 | 2018-01-31 | A kind of deck anti-static circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810096909.XA CN108173560A (en) | 2018-01-31 | 2018-01-31 | A kind of deck anti-static circuit and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108173560A true CN108173560A (en) | 2018-06-15 |
Family
ID=62512364
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810096909.XA Pending CN108173560A (en) | 2018-01-31 | 2018-01-31 | A kind of deck anti-static circuit and electronic equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108173560A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109068220A (en) * | 2018-09-03 | 2018-12-21 | 歌尔股份有限公司 | Earphone, earphone charging box and earphone suit |
| CN109347082A (en) * | 2018-10-31 | 2019-02-15 | Oppo广东移动通信有限公司 | A kind of anti-static device, terminal and method |
| CN111525939A (en) * | 2020-04-13 | 2020-08-11 | 重庆蓝岸通讯技术有限公司 | SD card protection system and method and protection circuit for multi-card-slot-in-one connector |
| CN112631967A (en) * | 2020-12-18 | 2021-04-09 | 北京中电华大电子设计有限责任公司 | High-capacity TF-SIM card and communication method thereof |
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| US20170179106A1 (en) * | 2015-12-16 | 2017-06-22 | Seiko Epson Corporation | Electrostatic protection circuit, semiconductor integrated circuit device, and electronic device |
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| CN101789984A (en) * | 2009-12-28 | 2010-07-28 | 宇龙计算机通信科技(深圳)有限公司 | SIM card interface circuit and mobile phone |
| US20170179106A1 (en) * | 2015-12-16 | 2017-06-22 | Seiko Epson Corporation | Electrostatic protection circuit, semiconductor integrated circuit device, and electronic device |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109068220A (en) * | 2018-09-03 | 2018-12-21 | 歌尔股份有限公司 | Earphone, earphone charging box and earphone suit |
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| CN109347082A (en) * | 2018-10-31 | 2019-02-15 | Oppo广东移动通信有限公司 | A kind of anti-static device, terminal and method |
| CN109347082B (en) * | 2018-10-31 | 2020-09-15 | Oppo广东移动通信有限公司 | Anti-static device, terminal and method |
| CN111525939A (en) * | 2020-04-13 | 2020-08-11 | 重庆蓝岸通讯技术有限公司 | SD card protection system and method and protection circuit for multi-card-slot-in-one connector |
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| CN112631967B (en) * | 2020-12-18 | 2023-12-26 | 北京中电华大电子设计有限责任公司 | High-capacity TF-SIM card and communication method thereof |
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Application publication date: 20180615 |
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