CN206773464U - Signal level intelligent adaptive SIM card protection circuit system - Google Patents
Signal level intelligent adaptive SIM card protection circuit system Download PDFInfo
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- CN206773464U CN206773464U CN201720475654.9U CN201720475654U CN206773464U CN 206773464 U CN206773464 U CN 206773464U CN 201720475654 U CN201720475654 U CN 201720475654U CN 206773464 U CN206773464 U CN 206773464U
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- sim card
- microcontroller
- transferring chip
- protection circuit
- signal level
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Abstract
The utility model discloses a kind of signal level intelligent adaptive SIM card protection circuit system; including microcontroller; microcontroller connects electrical level transferring chip; electrical level transferring chip connects SIM card interface; electric power source pair of module microcontroller is powered, and microcontroller is connected into row data communication by I2C interface with host computer；SIM card Data Transport Protocol (i.e. ISO7816 agreements) is simulated by microcontroller, the data-signal exported by electrical level transferring chip to SIM card carries out Potential adapting conversion, the output of SIM varying levels is converted into fixed level and is output to microcontroller, to meet the interface requirements of microcontroller, the data communication between SIM card and host computer is finally realized.
Description
Technical field
The utility model belongs to Interface Expanding field of circuit technology, and in particular to a kind of signal level intelligent adaptive SIM
Card protection circuit system.
Background technology
Current most of general-purpose built-in type processor does not have or an only common SIM cards interface, and is used for fixation
Communicate usage scenario, supports fixed signal level；Needing to carry out special SIM card identification, detection and verification, data protection
Etc. under application of function scene, lack SIM interface support.For such a situation, also have many realize SIM card Interface Expanding on the market
Scheme, but there is limitation mostly, standard SIM card communication protocol and single SIM card signal level, multi-signal can only be realized
Level SIM card poor compatibility, functional expansionary are weak.
In addition, the data correctness of the equipment such as handheld terminal is increasingly taken seriously at present, increasing rogue program
The system file and application data in equipment can be distorted, cause system can not start or application data damage,
Equipment safety hidden danger be present, influence normal use.
Utility model content
The purpose of this utility model is overcome the deficiencies in the prior art, there is provided a kind of signal level intelligent adaptive SIM
Card protection circuit system.
The utility model is achieved through the following technical solutions：
A kind of signal level intelligent adaptive SIM card protection circuit system, including microcontroller, microcontroller connection level
Conversion chip, electrical level transferring chip connection SIM card interface, electric power source pair of module microcontroller are powered, and microcontroller passes through I2C
Interface is connected with host computer into row data communication；Simulating SIM card Data Transport Protocol by microcontroller, (i.e. ISO7816 is assisted
View), the data-signal exported by electrical level transferring chip to SIM card carries out Potential adapting conversion, and SIM varying levels are exported
Be converted to fixed level and be output to microcontroller, to meet the interface requirements of microcontroller, finally realize SIM card and host computer
Between data communication.
In the above-mentioned technical solutions, power module uses the LDO circuit MIC5319-3.3BD5 of low ripple.Power module will
The 3.3V voltages that external input power voltage is changed into a fixing-stable are supplied to microcontroller.
In the above-mentioned technical solutions, microcontroller uses ATmega8L-8MI single-chip microcomputers.
In the above-mentioned technical solutions, electrical level transferring chip uses TXS4555RGTR chips, electrical level transferring chip
TXS4555RGTR pin 5 connects 3.3V reference voltages, and electrical level transferring chip TXS4555RGTR pin 8,9,11 is connected to
SIM card interface circuit, electrical level transferring chip TXS4555RGTR pin 2,13,14,15 are connected to ATmega8L-8MI monolithics
Machine.
In the above-mentioned technical solutions, SIM card interface circuit uses model C707_10M006_512_2 clamshell SIM
Deck.
The advantages of the utility model and have the beneficial effect that：
The utility model employs microcontroller as chief component, passes through match circuit, power module and level
The combination of adaptive change-over circuit.In the case where common SIM interface can not meet requirement, there is provided a kind of new SIM
Card expanded circuit scheme, is capable of the intelligent self-adaptive of real SIM card signal level, the compatibility of enhancing different type SIM card and
Supportable, while according to user's request, customize related protection agreement, detection device system and application program when equipment starts
In critical security data, find incipient fault for data security in time, pass through recovery system and Application Backup data, ensure equipment
System and application program it is safe and reliable.
Brief description of the drawings
Fig. 1 is the structured flowchart of signal level intelligent adaptive SIM card protection circuit system.
Fig. 2 is the power circuit diagram of signal level intelligent adaptive SIM card protection circuit system.
Fig. 3 is the microcontroller governor circuit figure of signal level intelligent adaptive SIM card protection circuit system.
Fig. 4 is the Potential adapting change-over circuit figure of signal level intelligent adaptive SIM card protection circuit system.
Fig. 5 is the SIM card interface circuit figure of signal level intelligent adaptive SIM card protection circuit system.
Embodiment
The technical solution of the utility model is further illustrated with reference to specific embodiment.
A kind of signal level intelligent adaptive SIM card protection circuit system involved by the utility model, including microcontroller
Device, microcontroller connection electrical level transferring chip, electrical level transferring chip connection SIM card interface, electric power source pair of module microcontroller are carried out
Power supply, microcontroller enter row data communication by I2C interface and host computer.ISO7816 agreements are simulated by microcontroller, with symbol
SIM card data transport standard is closed, the data-signal for being exported SIM card using electrical level transferring chip carries out Potential adapting conversion,
To meet the SIM card use demand of varying level, the data communication between different SIM card and host computer is finally realized.
Referring to accompanying drawing 2, power module：Using the LDO circuit MIC5319-3.3BD5 of low ripple.Power module will be outside defeated
Enter supply voltage and be changed into the 3.3V voltages of a fixing-stable to be supplied to micro controller system.
Referring to accompanying drawing 3, microcontroller governor circuit：Using core of the ATmega8L-8MI single-chip microcomputers as whole system,
By ATmega8L-8MI single-chip simulation standard SIM card agreements, the extension of SIM card interface is carried out.Simultaneously, additionally it is possible to according to making
With demand, related protocol is formulated, critical security data is protected, finds incipient fault for data security in time, pass through recovery system and application
Program backup data, ensure device data safety.
Referring to accompanying drawing 4, using electrical level transferring chip TXS4555RGTR as Potential adapting change-over circuit, level conversion
Chip TXS4555RGTR pin 5 connects 3.3V reference voltages, and electrical level transferring chip TXS4555RGTR pin 8,9,11 connects
It is connected to SIM card interface circuit, it is mono- that electrical level transferring chip TXS4555RGTR pin 2,13,14,15 is connected to ATmega8L-8MI
Piece machine.The data-signal that electrical level transferring chip TXS4555RGTR exports SIM card carries out Potential adapting conversion, can be by SIM
Varying level output (1.8V or 3V) is converted to fixed 3.3V level and is output to ATmega8L-8MI single-chip microcomputers, to meet
The interface requirements of ATmega8L-8MI single-chip microcomputers.
Referring to accompanying drawing 5, SIM card interface circuit：Using model C707_10M006_512_2 clamshell SIM card holder, energy
It is enough to adapt to mobile phone on the market and the general standard SIM card of handheld terminal, increase anti-static precautions on circuit, can effectively protect and
From in electrostatic caused by dismounting card, protection SIM card is without damage, ensures that circuit stability is reliable.
The utility model is to carry out innovation improvement on the basis of standard SIM card expanded circuit, and first, microcontroller is made
For the core of whole system, increase electric power source pair of module whole system is powered, and SIM card standard agreement is simulated using microcontroller
Interface Expanding is carried out, Potential adapting change-over circuit is further added by, can adapt to the level demand of different SIM card.
Exemplary description is done to the utility model above, it should explanation, do not departing from core of the present utility model
In the case of the heart, any simple deformation, modification or other skilled in the art can not spend creative work etc.
The scope of protection of the utility model is each fallen within replacing.
Claims (5)
- A kind of 1. signal level intelligent adaptive SIM card protection circuit system, it is characterised in that：Including microcontroller, microcontroller Device connects electrical level transferring chip, electrical level transferring chip connection SIM card interface, and power module connection microcontroller is supplied it Electricity, microcontroller are connected by I2C interface with host computer.
- A kind of 2. signal level intelligent adaptive SIM card protection circuit system according to claim 1, it is characterised in that： Power module uses the LDO circuit MIC5319-3.3BD5 of low ripple, and external input power voltage is changed into one by power module The 3.3V voltages of individual fixing-stable are supplied to microcontroller.
- A kind of 3. signal level intelligent adaptive SIM card protection circuit system according to claim 1, it is characterised in that： Microcontroller uses ATmega8L-8MI single-chip microcomputers.
- A kind of 4. signal level intelligent adaptive SIM card protection circuit system according to claim 3, it is characterised in that： Electrical level transferring chip uses TXS4555RGTR chips, and electrical level transferring chip TXS4555RGTR pin 5 connects 3.3V benchmark electricity Pressure, electrical level transferring chip TXS4555RGTR pin 8,9,11 are connected to SIM card interface circuit, electrical level transferring chip TXS4555RGTR pin 2,13,14,15 is connected to ATmega8L-8MI single-chip microcomputers.
- A kind of 5. signal level intelligent adaptive SIM card protection circuit system according to claim 1, it is characterised in that： SIM card interface circuit uses model C707_10M006_512_2 clamshell SIM card holder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720475654.9U CN206773464U (en) | 2017-05-02 | 2017-05-02 | Signal level intelligent adaptive SIM card protection circuit system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720475654.9U CN206773464U (en) | 2017-05-02 | 2017-05-02 | Signal level intelligent adaptive SIM card protection circuit system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206773464U true CN206773464U (en) | 2017-12-19 |
Family
ID=60648959
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720475654.9U Active CN206773464U (en) | 2017-05-02 | 2017-05-02 | Signal level intelligent adaptive SIM card protection circuit system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206773464U (en) |
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2017
- 2017-05-02 CN CN201720475654.9U patent/CN206773464U/en active Active
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