CN105302319B - A kind of press key locking control circuit and portable mobile terminal - Google Patents
A kind of press key locking control circuit and portable mobile terminal Download PDFInfo
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- CN105302319B CN105302319B CN201410351184.6A CN201410351184A CN105302319B CN 105302319 B CN105302319 B CN 105302319B CN 201410351184 A CN201410351184 A CN 201410351184A CN 105302319 B CN105302319 B CN 105302319B
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Abstract
The present invention is suitable for electronic field, provides a kind of press key locking control circuit and portable mobile terminal, the circuit include：Electric power management circuit, for output steady dc voltage after the power is turned on as unlocking signal, the output end connection of input terminal and adapter；Signal control circuit, it for being unlocked to button according to the unlocking signal, and is instructed to the panel output key, the output end connection of input terminal key circuit, the output end of its power end and electric power management circuit connects, and the output end of signal control circuit and the input terminal of panel connect.The present invention locks signal control circuit after test passes of dispatching from the factory, make product keys deactivation in transit, and signal control circuit is unlocked when user first powers on use to product, the operating function for restoring button solves the product security hidden trouble caused by accident booting or operation generate heat release and battery consumes excessively in transit.
Description
Technical field
The invention belongs to electronic field more particularly to a kind of press key locking control circuit and portable mobile terminals.
Background technology
With the fast development of industry and information technology, tablet computer is with its remarkable portable performance and powerful treatability
Can, it is more and more to live an indispensable tool as us, notebook and desktop computer can be replaced in the near future.
But tablet computer all uses poly-lithium battery or high pressure polymerisation electricity to extend continuation of the journey or stand-by time as possible
Pond, existing polymer battery are overcharged and are crossed and put, it will permanent damage battery, or even set off an explosion and fire, especially storing
Or in transit, the power button of tablet computer, which is surprisingly touched, so that machine is opened, and enters working condition, what ontology generated
Heat is assembled because packaging material can not radiate, and is easy damage machine and is possible to generate fire.
Invention content
The embodiment of the present invention is designed to provide a kind of press key locking control circuit, it is intended to solve current tablet computer etc.
The problem of portable mobile terminal leads to security risk because of unexpected booting.
The embodiment of the present invention is achieved in that a kind of press key locking control circuit, the press key locking control circuit
The output end of input terminal and key circuit connects, and the output end of the press key locking control circuit and the input terminal of panel connect,
The power end of the press key locking control circuit and the output end of adapter connect, and the press key locking control circuit includes：
Electric power management circuit, for output steady dc voltage after the power is turned on as unlocking signal, the power management electricity
The input terminal on road is the power end of the press key locking control circuit；
Signal control circuit for being unlocked to button according to the unlocking signal, and is instructed to the panel output key,
The input terminal of the signal control circuit is the input terminal of the press key locking control circuit, the power supply of the signal control circuit
End is connect with the output end of the electric power management circuit, and the output end of the signal control circuit is press key locking control electricity
The output end on road.
The another object of the embodiment of the present invention is to provide a kind of portable mobile using above-mentioned press key locking control circuit
Terminal.
The embodiment of the present invention locks signal control circuit after test passes of dispatching from the factory, to make product on transport way
Middle keys deactivation, and signal control circuit is unlocked when user first powers on use to product, restore the operating work of button
Can, solve the product security risk caused by accident booting or operation generate heat release and battery consumes excessively in transit
Problem has achieved the purpose that protect Product transport safety.
Description of the drawings
Fig. 1 is the structure chart of press key locking control circuit provided in an embodiment of the present invention；
Fig. 2 is the exemplary circuit structure chart of press key locking control circuit provided in an embodiment of the present invention；
Fig. 3 is the exemplary circuit structure of clock control module in press key locking control circuit provided in an embodiment of the present invention
Figure.
Specific implementation mode
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
The embodiment of the present invention locks signal control circuit after test passes of dispatching from the factory, to make product on transport way
Middle keys deactivation, and signal control circuit is unlocked when user first powers on use to product, restore the operating work of button
Can, solve the product security risk caused by accident booting or operation generate heat release and battery consumes excessively in transit
Problem.
The realization of the present invention is described in detail below in conjunction with specific embodiment：
Fig. 1 shows that the structure of press key locking control circuit provided in an embodiment of the present invention is only shown for convenience of description
Part related to the present invention.
As an embodiment of the present invention, which can be arranged the master in any portable mobile terminal
On plate, such as tablet computer or mobile phone.
The input terminal of the press key locking control circuit 1 is connect with the output end of key circuit 2, press key locking control circuit 1
Output end connect with the input terminal of panel 3, the power end of press key locking control circuit 1 is connect with the output end of adapter 4, is pressed
Key lock control circuit 1 includes：
Electric power management circuit 11, for output steady dc voltage after the power is turned on as unlocking signal, power management electricity
The input terminal on road 11 is the power end of press key locking control circuit 1；
Signal control circuit 12 for being unlocked to button according to unlocking signal, and instructs, the signal to panel output key
The input terminal of control circuit 12 is the input terminal of press key locking control circuit 1, power end and the power supply pipe of signal control circuit 12
The output end connection of circuit 11 is managed, the output end of signal control circuit 12 is the output end of press key locking control circuit 1.
In embodiments of the present invention, after product is in factory testing qualification, pass through DDC (Direct Digital
Control) command control signal control circuit 12 enters press key locking state, or shuts down after manually exiting factory mode, makes to put down
Plate computer enters user's pattern, and the microcontroller of signal control circuit 12 shields the control letter of its input terminal by instruction at this time
Number, any touching instruction that key circuit sends out is not handled, has blocked operation of the key circuit to panel, i.e. tablet computer at this time
Button will lose operating function.
It is worth noting that press key locking shape can be entered by command control signal control circuit 12 (such as microcontroller)
State that is, it is only necessary to shield push button signalling acquisition of the microcontroller for input pin, and shields the specific of a certain pin of microcontroller
Operation belongs to technical means commonly used by such a person skilled in the art, and details are not described herein again.
After signal control circuit 12 is locked, Product transport on the way, it is aobvious even if the button of product be in triggering state
Display screen and other function modules also do not work, and avoid product in transit because unexpected booting or operation generate heat release and battery
It consumes caused security hidden trouble excessively, has achieved the purpose that protect Product transport safety.
Also, product is first powered in user in use, alternating voltage is converted into DC voltage by adapter, then
By further decompression, the voltage stabilizing of electric power management circuit 11, output steady dc voltage is exported as unlocking signal gives signal control
Circuit 12 processed, signal control circuit 12 are released after receiving unlocking signal to input terminal (such as a certain input pin of microcontroller)
Locking, obtain push button signalling from the port again, to restore the operating function of button, ensure user's normal use.
In embodiments of the present invention, the status switch data (locking or unlocking for button) of button can be stored in processor
Memory in.
Fig. 2 shows the exemplary circuit structures of press key locking control circuit provided in an embodiment of the present invention, for the ease of saying
Bright, only the parts related to the present invention are shown.
As an embodiment of the present invention, electric power management circuit 11 is power management chip PMIC.
As a preferred embodiment of the present invention, electric power management circuit 11 can also be connected by first interface CN1 and adapter 4
It connects, signal control circuit 12 can be connect by second interface CN2 with panel 3.
Mini USB (Universal Serial Bus) or Mini DC (Direct may be used in first interface CN1
Current) interface, second interface CN2 may be used MIPI (Mobile Industry Processor Interface),
The interfaces such as LVDS (Low-Voltage Differential Signaling) or RGB (Red Green Blue).
As an embodiment of the present invention, which includes：
Button detection module 121, for receiving key command, the input terminal of button detection module 121 is signal control electricity
The input terminal on road 12；
Processor MCU, the output for shielding button detection module 121 in lock-out state, after receiving unlocking signal
Cancel the shielding to button detection module 121, and switch control letter is generated according to the key command that button detection module 121 exports
Number, the button test side of processor MCU is connect with the output end of button detection module 121, and the power end of processor MCU is signal
The power end of control circuit 12；
Clock control module 123, for providing clock signal, clock control module 123 and processor for processor MCU
MCU connections；
Switch control module 122, for controlling output key instruction, switch control module 122 according to switch control signal
Control terminal connect with the switch order end of processor MCU, the output end of switch control module 122 is signal control circuit 12
Output end.
As a preferred embodiment of the present invention, the button detection module 121 includes：
Resistance R1, resistance R2, capacitance C1, diode D1 and diode D2；
One end of resistance R1 and the cathode of diode D2 are connect with supply voltage simultaneously, and the other end of resistance R1 is examined for button
The input terminal for surveying module 121 is grounded by capacitance C1, the anode of diode D2 simultaneously with the cathode of diode D1 and resistance R2
One end connects, and one end of resistance R2 is also connect with one end of capacitance C1, and the other end of resistance R2 is the defeated of button detection module 121
Outlet, the plus earth of diode D1.
The switch control module 122 includes：
Resistance R3, resistance R4, resistance R5, capacitance C2, capacitance C3, capacitance C4, diode D3, diode D4 and first open
Close pipe Q1；
One end of resistance R3 is connect with supply voltage, the other end of resistance R3 be switch control module 122 control terminal with
One end of resistance R4 connects, and the other end of resistance R4 connects with the control terminal of the anode of diode D3 and first switch pipe Q1 simultaneously
It connects, the other end of resistance R4 is also grounded by capacitance C2, the cathode of diode D3 one end with resistance R5 and first switch simultaneously
The input terminal of pipe Q1 connects, and the other end of resistance R5 is connect with supply voltage, the input terminal of first switch pipe Q1 also with diode
The cathode of D4 connects, and the output end of the anode and first switch pipe Q1 of diode D4 is grounded simultaneously, and the cathode of diode D4 is to open
Close control module 122 output end also simultaneously connect with one end of one end of capacitance C3 and capacitance C4, the other end of capacitance C3 with
The other end of capacitance C4 is grounded simultaneously.
As a preferred embodiment of the present invention, NPN type triode may be used in first switch pipe Q1, N can also be used
Channel mosfet is realized；
First switch pipe Q1 is N-channel MOS FET, and the drain electrode of N-channel MOS FET is the input terminal of first switch pipe Q1, N ditches
The source electrode of road MOSFET is the output end of first switch pipe Q1, and the grid of N-channel MOS FET is the control terminal of first switch pipe Q1.
In embodiments of the present invention, supply voltage VCC can be provided by power management chip PMIC or other power supplys.
After adapter 4 is inserted into first interface CN1 and the DC voltage of stability criterion is provided gives power management chip PMIC,
Power management chip PMIC is activated, and exports power supply signal SY_VDD to each function module, which believes as unlock
Number control processor MCU after the power is turned on, adapter detection port ACIO sets high potential, and processor MCU restores to key circuit
By key control signal receive.
In embodiments of the present invention, resistance R1 is the key-press input end PW_KEY pull-up resistors of processor MCU, to provide drive
Kinetic force, capacitance C1 are filter capacitor, and diode D1, D2 are two pole of protection at PW_KEY mouthfuls of the key-press input end of processor MCU
Pipe, Electro-static Driven Comb (ESD, Electro-Static discharge) circuit for protecting processor MCU, to protect processor
MCU safety, resistance R2 are the current-limiting resistance at PW_KEY mouthfuls of the key-press input end of processor MCU, and resistance R3 is pressing for processor MCU
The pull-up resistor that PW_KEY mouthfuls of key input end, resistance R4 are the current-limiting resistance of first switch pipe Q1, and capacitance C2 is first switch pipe
The filter capacitor of Q1, diode D3, D4 are the protection diode of first switch pipe Q1, and resistance R5 is the pull-up of first switch pipe Q1
Resistance provides power supply, and capacitance C3, C4 are used to stablize the out-put supply of first switch pipe Q1.
Wherein, capacitance C2, capacitance C3, capacitance C4 and diode D3, diode D4 constitute protection circuit, to protect switch
Regular event.
The embodiment of the present invention locks signal control circuit after test passes of dispatching from the factory, to make product on transport way
Middle keys deactivation, and signal control circuit is unlocked when user first powers on use to product, restore the operating work of button
Can, solve the product security risk caused by accident booting or operation generate heat release and battery consumes excessively in transit
Problem has achieved the purpose that protect Product transport safety.
Fig. 3 shows the exemplary circuit knot of clock control module in press key locking control circuit provided in an embodiment of the present invention
Structure, for convenience of description, only the parts related to the present invention are shown.
As an embodiment of the present invention, clock control module 123 includes：
Resistance R6, resistance R7, resistance R8, resistance R10, capacitance C6, capacitance C7, voltage-stabiliser tube ZD1 and clock control chip
RTC；
One end of resistance R6 is connect with supply voltage, the programmable letter of the other end and clock control chip RTC of resistance R6
Number output pin SQW/OUT connections, the programmable signal output pin SQW/OUT of clock control chip RTC also with processor MCU
Clock end CLK__O connections, the serial data clock input pin SCL's and processor MCU of clock control chip RTC is serial
Data hour hands input terminal RTC_SCL connections, the serial number of the serial data pin SDA and processor MCU of clock control chip RTC
According to end RTC_SDA connections, the ground terminal GND ground connection of clock control chip RTC, the alarm interrupt pin of clock control chip RTC
INT is connect with broken ends of fractured bone RTC_INT in the alarm of processor MCU, and the alarm interrupt pin INT of clock control chip RTC is also simultaneously
It is connect with one end of one end of resistance R10 and capacitance C7, the other end of resistance R10 connects supply voltage, the other end of capacitance C7
Ground connection, the power end VDD of clock control chip RTC are connect with supply voltage, and the power end VDD of clock control chip RTC is also same
When connect with one end of one end of resistance R7 and resistance R8, the other end of resistance R7 is grounded by capacitance C6, and resistance R8's is another
End is connect with the enabled pin CLKen of the hour hands of clock control chip RTC, the power end VDD of clock control chip RTC also with voltage stabilizing
The cathode of pipe ZD1 connects, and the anode of voltage-stabiliser tube is connect with 5V power supplys.
In embodiments of the present invention, clock control module 123 provides clock frequency, clock control using power frequency quartz crystal
The super low-power consumption of chip RTC can extend the stand-by time of complete machine, be converted by power down detecting and power supply, realize external power supply with
The detection of battery, and the temperature applicability of circuit can be improved by temperature-compensating, reduce influence of the temperature to frequency deviation, clock
Control chip RTC can also program the output of wave row, and be internally integrated oscillating capacitance and optional reset circuit, to avoid system outside
Influence of portion's interference source to hour hands circuit, to enhance the compatibility of processor MCU, raising complete machine is standby to be stablized with system
Property and precision.
The another object of the embodiment of the present invention is to provide a kind of portable mobile using above-mentioned press key locking control circuit
Terminal.
The embodiment of the present invention locks signal control circuit after test passes of dispatching from the factory, to make product on transport way
Middle keys deactivation, and signal control circuit is unlocked when user first powers on use to product, restore the operating work of button
Can, solve the product security risk caused by accident booting or operation generate heat release and battery consumes excessively in transit
Problem has achieved the purpose that protect Product transport safety.
The above is merely preferred embodiments of the present invention, be not intended to limit the invention, it is all the present invention spirit and
All any modification, equivalent and improvement made by within principle etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of press key locking control circuit, which is characterized in that the input terminal and key circuit of the press key locking control circuit
Output end connection, the input terminal of the output end of the press key locking control circuit and panel connects, the press key locking control
The power end of circuit and the output end of adapter connect, and the press key locking control circuit includes：
Electric power management circuit, for output steady dc voltage after the power is turned on as unlocking signal, the electric power management circuit
Input terminal is the power end of the press key locking control circuit；
Signal control circuit for being unlocked to button according to the unlocking signal, and is instructed to the panel output key, described
The input terminal of signal control circuit be the press key locking control circuit input terminal, the power end of the signal control circuit with
The output end of the electric power management circuit connects, and the output end of the signal control circuit is the press key locking control circuit
Output end.
2. press key locking control circuit as described in claim 1, which is characterized in that the electric power management circuit is power management
Chip.
3. press key locking control circuit as described in claim 1, which is characterized in that the electric power management circuit connects by first
Mouth is connect with the adapter, and the signal control circuit is connect by second interface with the panel.
4. press key locking control circuit as claimed in claim 3, which is characterized in that the first interface be Mini USB or
Mini DC interfaces, the second interface are MIPI, LVDS or rgb interface.
5. press key locking control circuit as described in claim 1, which is characterized in that the signal control circuit includes：
Button detection module, for receiving key command, the input terminal of the button detection module is the signal control circuit
Input terminal；
Processor, the output for shielding the button detection module in lock-out state take after receiving the unlocking signal
The shielding to disappear to the button detection module, and switch control letter is generated according to the key command of button detection module output
Number, the button test side of the processor is connect with the output end of the button detection module, and the power end of the processor is
The power end of the signal control circuit；
Clock control module, for providing clock signal for the processor, the clock control module is connect with processor；
Switch control module, for controlling output key instruction according to the switch control signal, the switch control module
Control terminal is connect with the switch order end of the processor, and the output end of the switch control module is the defeated of signal control circuit
Outlet.
6. press key locking control circuit as claimed in claim 5, which is characterized in that the button detection module includes：
Resistance R1, resistance R2, capacitance C1, diode D1 and diode D2；
The cathode of one end of the resistance R1 and the diode D2 are connect with supply voltage simultaneously, the other end of the resistance R1
Be grounded by the capacitance C1 for the input terminal of the button detection module, the anode of the diode D2 simultaneously with two pole
The cathode of pipe D1 is connected with one end of the resistance R2, and one end of the resistance R2 is also connect with one end of the capacitance C1, institute
The other end for stating resistance R2 is the output end of the button detection module, the plus earth of the diode D1.
7. press key locking control circuit as claimed in claim 5, which is characterized in that the switch control module includes：
Resistance R3, resistance R4, resistance R5, capacitance C2, capacitance C3, capacitance C4, diode D3, diode D4 and first switch
Pipe；
One end of the resistance R3 is connect with supply voltage, and the other end of the resistance R3 is the control of the switch control module
End is connect with one end of the resistance R4, the other end of the resistance R4 and meanwhile with the anode of the diode D3 and described first
The control terminal of switching tube connects, and the other end of the resistance R4 is also grounded by the capacitance C2, the cathode of the diode D3
It is connect simultaneously with the input terminal of one end of the resistance R5 and the first switch pipe, the other end and the power supply electricity of the resistance R5
Pressure connection, the input terminal of the first switch pipe also connect with the cathode of the diode D4, the anode of the diode D4 and
The output end of the first switch pipe is grounded simultaneously, the cathode of the diode D4 be the output end of the switch control module also
It is connect simultaneously with one end of one end of the capacitance C3 and the capacitance C4, the other end of the capacitance C3 and the capacitance C4's
The other end is grounded simultaneously.
8. press key locking control circuit as claimed in claim 7, which is characterized in that the first switch pipe is N-channel
The drain electrode of MOSFET, the N-channel MOS FET are the input terminal of the first switch pipe, and the source electrode of the N-channel MOS FET is
The output end of the first switch pipe, the grid of the N-channel MOS FET are the control terminal of the first switch pipe.
9. press key locking control circuit as claimed in claim 5, which is characterized in that the clock control module includes：
Resistance R6, resistance R7, resistance R8, resistance R10, capacitance C6, capacitance C7, voltage-stabiliser tube ZD1 and clock control chip；
One end of the resistance R6 is connect with supply voltage, the other end of the resistance R6 and compiling for the clock control chip
Journey signal output pin (SQW/OUT) connects, the programmable signal output pin (SQW/OUT) of the clock control chip also with
The clock end (CLK_O) of the processor connects, the serial data clock input pin (SCL) of the clock control chip and institute
State serial data clock input terminal (RTC_SCL) connection of processor, the serial data pin (SDA) of the clock control chip
It is connect with the serial data end (RTC_SDA) of the processor, ground terminal (GND) ground connection of the clock control chip is described
The alarm interrupt pin (INT) of clock control chip is connect with broken ends of fractured bone RTC_INT in the alarm of the processor, clock when described
The alarm interrupt pin (INT) of coremaking piece is also connect with one end of one end of the resistance R10 and the capacitance C7 simultaneously, described
The other end of resistance R10 connects supply voltage, the other end ground connection of the capacitance C7, the power end of the clock control chip
(VDD) it is connect with supply voltage, the power end (VDD) of the clock control chip goes back one end with the resistance R7 and institute simultaneously
State one end connection of resistance R8, the other end of the resistance R7 be grounded by the capacitance C6, the other end of the resistance R8 and
The clock of the clock control chip enables pin (CLKen) connection, the power end (VDD) of the clock control chip also with institute
The cathode connection of voltage-stabiliser tube ZD1 is stated, the anode of the voltage-stabiliser tube is connect with 5V power supplys.
10. a kind of portable mobile terminal, which is characterized in that the mainboard of the portable mobile terminal includes such as claim 1 to 9 times
Press key locking control circuit described in one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410351184.6A CN105302319B (en) | 2014-07-22 | 2014-07-22 | A kind of press key locking control circuit and portable mobile terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410351184.6A CN105302319B (en) | 2014-07-22 | 2014-07-22 | A kind of press key locking control circuit and portable mobile terminal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105302319A CN105302319A (en) | 2016-02-03 |
| CN105302319B true CN105302319B (en) | 2018-08-07 |
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|---|---|---|---|
| CN201410351184.6A Active CN105302319B (en) | 2014-07-22 | 2014-07-22 | A kind of press key locking control circuit and portable mobile terminal |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109190419B (en) * | 2018-09-03 | 2020-06-16 | 深圳福鸽科技有限公司 | Key encryption circuit and method |
| CN110955153A (en) * | 2019-12-10 | 2020-04-03 | 杭州行至云起科技有限公司 | Multi-way switch control device and method |
| CN112256120A (en) * | 2020-10-20 | 2021-01-22 | 维沃移动通信有限公司 | Protection circuit and electronic device |
| CN113064478A (en) * | 2021-03-11 | 2021-07-02 | Oppo广东移动通信有限公司 | Power adapter, power receiving device, and communication control system |
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| CN102467241A (en) * | 2010-11-12 | 2012-05-23 | 珠海全志科技股份有限公司 | Keyboard of mobile terminal and method for realizing keying and keyboard lock for same |
| CN102981717A (en) * | 2012-11-12 | 2013-03-20 | 东莞宇龙通信科技有限公司 | Terminal and touch key-press locking method |
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| CN204129663U (en) * | 2014-07-22 | 2015-01-28 | 中国长城计算机深圳股份有限公司 | A kind of press key locking control circuit and portable mobile terminal |
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|---|---|---|---|---|
| US8432196B2 (en) * | 2010-08-10 | 2013-04-30 | Samsung Electronics Co., Ltd. | Method and apparatus of resetting mobile device |
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| CN102467241A (en) * | 2010-11-12 | 2012-05-23 | 珠海全志科技股份有限公司 | Keyboard of mobile terminal and method for realizing keying and keyboard lock for same |
| CN102981717A (en) * | 2012-11-12 | 2013-03-20 | 东莞宇龙通信科技有限公司 | Terminal and touch key-press locking method |
| CN103529725A (en) * | 2013-07-29 | 2014-01-22 | 南京熊猫电子股份有限公司 | Startup and shutdown circuit capable of realizing zero-power consumption shutdown |
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| CN105302319A (en) | 2016-02-03 |
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| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: 518000 computer building of the Great Wall, Nanshan District science and Technology Park, Shenzhen, Guangdong Applicant after: China the Great Wall science and technology group Limited by Share Ltd Address before: 518000 the Great Wall computer building, 3 FA FA Road, Nanshan District science and Technology Park, Guangdong, Shenzhen Applicant before: China Changcheng Computer Shenzhen Co., Ltd. |
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| GR01 | Patent grant | ||
| GR01 | Patent grant |