CN106358179A - SIM (Subscriber Identification Module) card switching circuit and SIM card switching method - Google Patents

Abstract

The present invention provides a SIM card switching circuit and a SIM card switching method, wherein the SIM card switching circuit is applied to an intelligent terminal, the intelligent terminal has multiple SIM cards, and the multiple SIM cards have NFC functions, and the features are: The switching circuit includes: a power input module, a button input module, a main chip, an NFC chip, a control signal module, and a switch chip; the NFC chip includes an interrupt control interface; the switch chip includes: a power input interface, a button input interface, and a first output interface , the second output interface, the control signal input interface; the power input is connected to the power input interface of the switch chip, the key input module is connected to the key input interface, the interrupt control interface is connected to the first output interface, the main chip is connected to the second output interface, and the control signal module is connected to Control signal input interface. Through the switching circuit of the SIM card provided by the invention, the switching of the SIM card can be performed in the shutdown state.

Description

A kind of switching circuit and switching method of customer identification module SIM card

technical field

The invention relates to the field of mobile communication, more specifically, to a switching circuit and a switching method of a customer identification module SIM card.

Background technique

At present, there are more and more smart terminals with Near Field Communication (NFC) technology, and NFC functions are divided into card simulation mode, card reader mode, and peer-to-peer mode.

1. Card emulation mode: In this mode, the mobile phone is equivalent to an integrated circuit (IC) card using radio frequency identification (Radio Frequency Identification, RFID) technology. It can replace a large number of IC cards, including credit cards, shopping mall shopping cards, bus cards, subway cards, access control, bus tickets, tickets and so on.

2. Peer-to-peer mode (P2P mode): This mode is similar to infrared, and can be used for data exchange, but the transmission distance is shorter, the transmission creation speed is faster, the transmission speed is faster, and the power consumption is low. Linking two NFC-enabled devices can realize point-to-point data transmission, such as downloading music, exchanging pictures or synchronizing device address books. Therefore, through NFC, multiple devices such as digital cameras, handheld computers, computers and smart terminals can exchange data or services.

3. Reader/writer mode: Used as a non-contact card reader, such as reading relevant information from posters or electronic tags for exhibition information.

Smart terminal NFC supports the above three functions when the screen is on, but only supports card emulation mode when the screen is off or powered off.

At present, mobile companies have launched SIM (Subscriber Identification Module, customer identification module) cards with NFC functions. The SIM card mentioned in the present invention refers to a special card with NFC function, and the current application is more to utilize the SIM card to replace the bus card. The bus card function can be realized by inserting a smart terminal with a SIM card with bus card function, and the smart terminal can swipe the card when it is turned on or off. When the two inserted cards have NFC function, and one card has abnormal function (including not being able to swipe the card or the balance is insufficient in the application), you can switch to another card for payment.

Existing smart terminals already have a solution that can support dual SIM cards, but the current dual-card solution only supports the SIM card switching function in the power-on state. After the shutdown, it can only default to the SIM card selected before shutdown. SIM cards are selected and switched, severely limiting user choice.

Contents of the invention

The invention provides a SIM card switching circuit and switching method to solve the problem in the prior art that the SIM card cannot be switched after the smart terminal is turned off.

In order to solve the above problems, the present invention discloses a switching circuit of a SIM card, which is applied to an intelligent terminal. The intelligent terminal has multiple SIM cards, and the multiple SIM cards have NFC functions. The switching circuit includes: power input Module, button input module, main chip, NFC chip, control signal module and switch chip; The NFC chip includes an interrupt control interface; The switch chip includes: a power input interface, a button input interface, a first output interface, a second output interface, control signal input interface; the power input is connected to the power input interface of the switch chip, the button input module is connected to the button input interface, the interrupt control interface is connected to the first output interface, and the The main chip is connected to the second output interface, and the control signal module is connected to the control signal input interface.

In order to solve the above problems, the present invention also discloses a method for switching SIM cards of customer identification modules, which is applied in the SIM card switching circuit of intelligent terminals, and the intelligent terminals have multiple SIM cards, and the multiple SIM cards have NFC Function, the method includes: the control signal input interface of the switch chip receives the control signal; the switch chip determines the working state of the switch chip output interface according to the control signal; the key input interface of the switch chip receives A key signal triggered by an external key; according to the working state of the output interface, the key signal is output to the corresponding chip; when the NFC chip receives the key signal, the working mode of the SIM card is switched.

Compared with the prior art, the present invention has the following advantages:

The embodiment of the present invention provides a SIM card switching circuit and switching method. Through the SIM card switching circuit provided by the embodiment of the present invention, the smart terminal can detect the key signal triggered by the external key in the shutdown state, and use this signal to The SIM is switched, so as to realize the switching of the SIM card in the shutdown state.

Description of drawings

FIG. 1 is a schematic structural diagram of a SIM card switching circuit according to Embodiment 1 of the present invention;

Fig. 2 is a flow chart of the steps of a SIM card switching method according to Embodiment 3 of the present invention;

FIG. 3 is a flow chart of steps of a SIM card switching method according to Embodiment 4 of the present invention.

detailed description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

Embodiment one

Referring to FIG. 1 , it shows a schematic structural diagram of a switching circuit of a SIM card according to Embodiment 1 of the present invention.

The switching circuit of the SIM card in the embodiment of the present invention is applied to a smart terminal, and the smart terminal has multiple SIM cards, and the multiple SIM cards have NFC functions, and the switching circuit includes:

Power input 101 , key input module 102 , main chip 103 , NFC chip 104 , control signal module 105 and switch chip 106 .

The NFC chip 104 includes an interrupt control interface 1041 ; the switch chip includes 106 : a power input interface 1061 , a key input interface 1062 , a first output interface 1063 , a second output interface 1604 , and a control signal input interface 1065 .

Preferably, the control signal module includes a GPIO signal interface 1051 and a voltage dividing resistor 1052 .

The power input 101 is connected to the power input interface 1061 of the switch chip 106, the key input module 102 is connected to the key input interface 1062, the interrupt control interface 1041 is connected to the first output interface 1063, the main chip 103 is connected to the second output interface 1064, and the control signal module 105 is connected to the control Signal input interface 1065 .

Through the SIM card switching circuit provided by the embodiment of the present invention, the smart terminal can detect the key signal triggered by the external key in the shutdown state, and switch the SIM through this signal, thereby realizing the switching of the SIM card in the shutdown state.

Embodiment two

Still referring to FIG. 1 , it shows a schematic structural diagram of a switching circuit of a SIM card according to Embodiment 2 of the present invention.

The switching circuit of the SIM card in the embodiment of the present invention is applied to a smart terminal, and the smart terminal has multiple SIM cards, and the multiple SIM cards have NFC functions, and the switching circuit includes:

Power input 101 , key input module 102 , main chip 103 , near field communication NFC chip 104 , control signal module 105 and switch chip 106 .

The NFC chip 104 includes an interrupt control interface 1041 ; the switch chip includes 106 : a power input interface 1061 , a key input interface 1062 , a first output interface 1063 , a second output interface 1604 , and a control signal input interface 1065 .

Preferably, the control signal module includes a GPIO signal interface 1051 and a voltage dividing resistor 1052 .

The power input 101 is connected to the power input interface 1061 of the switch chip 106, the key input module 102 is connected to the key input interface 1062, the interrupt control interface 1041 is connected to the first output interface 1063, the main chip 103 is connected to the second output interface 1064, and the control signal module 105 is connected to the control Signal input interface 1065 .

The key input module 102 includes: an external key 1021 for triggering a key signal.

Preferably, the external keys include: a volume up key and/or a volume down key.

The control signal generated by the control signal module 105 is the general input/output GPIO signal of the intelligent terminal processor. The GPIO signal is a high-level signal when the power is turned on, and the GPIO is powered off when the power is turned off. The control signal is pulled to a low power level by the voltage dividing resistor 1052. level signal; the switch chip 106 selects the first output interface 1063 or the second output interface 1064 as the output interface according to the control signal.

When the smart terminal is in the power-off state, the control signal input interface 1065 receives a low-level signal, and the switch chip 106 selects the first output interface 1063 as the output interface; when the smart terminal is in the power-on state, the control signal input interface 1065 receives a high-level signal, and the switch The chip 106 selects the second output interface 1064 as the output interface.

When the interrupt control interface 1041 detects the signal input by the first output interface 1063, it performs SIM card switching on the NFC chip according to the received signal.

The SIM card switching circuit provided by the embodiment of the present invention, in addition to the beneficial effects of the SIM card switching circuit in Embodiment 1, also controls the output of the switching chip through the GPIO signal of the terminal CPU and according to the terminal's on-off state. The on and off state of the interface, so that the terminal can transmit the button signal to different chips for corresponding operations according to the power on and off state.

Embodiment three

Referring to FIG. 2 , it shows a flowchart of a SIM card switching method according to Embodiment 3 of the present invention.

The SIM card switching method of the embodiment of the present invention is applied in a SIM card switching circuit of an intelligent terminal, the intelligent terminal has multiple SIM cards, and the multiple SIM cards have NFC functions, and the method includes the following steps:

Step 301: The control signal input interface of the switch chip receives the control signal.

In the shutdown state, the power input always supplies power to the switch chip, so that the switch chip can still realize the SIM card switching function when the switch chip is turned off.

Step 302: The switch chip determines the working state of the output interface of the switch chip according to the control signal.

Wherein, the control signal is a GPIO (General Purpose Input Output, general purpose input/output) signal of the terminal processor.

When the smart terminal is in the power-on state, the GPIO signal is a high-level signal, the first output interface is disconnected, and the second output interface outputs the button signal to be input to the main chip; when the smart terminal is in the power-off state, the GPIO signal is a low-level signal, and the second The first output interface is turned on, and the second output interface is turned off; wherein, the first output interface is used to output the key signal to the NFC chip interrupt control interface.

Step 303: The key input interface of the switch chip receives a key signal triggered by an external key.

Preferably, the external keys include: a volume up key and/or a volume down key.

Step 304: Output the button signal to the corresponding chip according to the working status of the output interface.

When the smart terminal is in the power-on state, the SIM is switched through the terminal's built-in application program, and when the main chip receives the key signal, it executes the original function of the external key; when the smart terminal is in the power-off state, the NFC chip interrupts the control interface to detect the key signal, switch the SIM card according to the button signal.

Step 305: When the NFC chip receives the key signal, switch the working mode of the SIM card.

When the smart terminal is in the off state, the NFC chip receives the key signal through the first output interface, and switches the SIM according to this signal; when the smart terminal is in the power-on state, the main chip also receives the key signal through the second output interface, at this time The terminal executes the original functions of the external keys through its own application software.

Through the SIM card switching method provided by the embodiment of the present invention, the smart terminal can detect the key signal triggered by the external key in the shutdown state, and switch the SIM through this signal, thereby realizing the switching of the SIM card in the shutdown state.

Embodiment four

Referring to FIG. 3 , it shows a flowchart of a SIM card switching method according to Embodiment 4 of the present invention.

In the embodiment of the present invention, the SIM card switching method of the present invention is described by taking the SIM card switching of the smart terminal in the shutdown state as an example. The SIM card switching method of the embodiment of the present invention specifically includes the following steps:

Step 401: The control signal input interface of the switch chip receives the control signal.

After the switch chip receives the control signal, it determines the working state of the output interface of the switch chip according to the state of the smart terminal. For the specific determination method, refer to the description in step 402 .

Wherein, the working state of the output interface is to determine the first output interface for inputting signals to the NFC chip and the second output interface for inputting signals to the main chip, and the on or off status of these two interfaces.

Step 402: When the smart terminal is in a power-off state, turn on the first output interface and turn off the second output interface.

The first output interface is used to output the button signal to the NFC chip interrupt control interface. The control signal is the general input/output GPIO signal of the terminal processor. When the smart terminal is in the shutdown state, the GPIO signal is a low level signal.

In addition, when the smart terminal is in the power-on state, the GPIO signal is a high-level signal, the first output interface is disconnected, and the second output interface outputs a key signal to be input to the main chip.

Step 403: The key input interface of the switch chip receives a key signal triggered by an external key.

Preferably, the external keys include: a volume up key and/or a volume down key.

Step 404: When the smart terminal is in the power-off state, the NFC chip interrupts the control interface to detect the button signal.

Step 405: The NFC chip performs card switching on the SIM according to the button signal.

When the smart terminal is in a power-off state, the first output interface is turned on, and the second output interface is turned off. The interrupt port of the NFC chip passes through the first output interface of the switch chip. When the interrupt port of the NFC chip detects the key signal, the SIM card is switched. When the NFC chip detects the button signal, the SIM card that is currently in the working state stops working, and the SIM card that is currently in the non-working state starts to work.

In addition, when the smart terminal is turned on, the SIM is switched through the terminal's built-in application program, and the main chip receives the key signal to execute the original function of the external key.

The SIM card switching method of the embodiment of the present invention can achieve the effect achieved by the corresponding SIM card switching circuit in the first embodiment and the second embodiment, and has the beneficial effects of the corresponding embodiments, which will not be repeated here.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other. As for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and for the related parts, please refer to the part of the description of the method embodiment.

Above, the switching circuit and switching method of a kind of SIM card provided by the present invention have been introduced in detail. In this paper, specific examples have been used to illustrate the implementation steps and implementation devices of the present invention. The description of the above embodiments is only used to help Understand the method of the present invention and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation and scope of application. In summary, the content of this specification is not It should be understood as a limitation of the present invention. It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention can be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In a unit claim enumerating several means, several of these means can be embodied by one and the same item of hardware. The use of the words first, second, etc. does not indicate any order. These words can be interpreted as names.

Claims (10)

1. a kind of switching circuit of sim card, is applied to intelligent terminal, and described intelligent terminal has multiple sim cards, described multiple Sim card has nfc function it is characterised in that described switching circuit includes:

Power Entry Module, keyboard input module, master chip, nfc chip, control signal module and switch chip；

Described nfc chip includes interrupting control interface；Described switch chip includes: power input interface, key-press input interface, One output interface, the second output interface, control signal input interface；

Described power input connects the described power input interface of described switch chip, presses described in described keyboard input module connection Key input interface, described interruption control interface connects described first output interface, and described master chip connects described second output and connects Mouthful, described control signal module connects described control signal input interface.

2. the switching circuit of sim card according to claim 1 is it is characterised in that described keyboard input module includes: outside Button, described external key is used for triggering push button signalling.

3. sim card according to claim 1 switching circuit it is characterised in that:

The control signal that described control signal module produces is the gpio signal of intelligent terminal's processor, and described gpio signal is being opened It is high level signal during machine, be low level signal in shutdown；

Described switch chip, according to described control signal, selects by described first output interface or described second output interface conduct Output interface.

4. sim card according to claim 3 switching circuit it is characterised in that:

When described intelligent terminal is in off-mode, described control signal input interface receives low level signal, described switch core Piece selects described first output interface as output interface；

When described intelligent terminal is in open state, described control signal input interface receives high level signal, described switch core Piece selects described second output interface as output interface.

5. sim card according to claim 4 switching circuit it is characterised in that:

When described interruption control interface detects the signal of described first output interface input, according to the signal receiving to institute State nfc chip and carry out the switching of sim card.

6. a kind of changing method of client identification module sim card, is applied in the sim card switching circuit of intelligent terminal, described intelligence Terminal can have multiple sim cards, multiple sim cards described have nfc function, and methods described includes:

The control signal input interface of described switch chip receives control signal；

Described switch chip determines the working condition of described switch chip output interface according to described control signal；

The key-press input interface of described switch chip, receives the push button signalling being triggered by external key；

According to the working condition of described output interface, described push button signalling is exported to corresponding chip；

When nfc chip receives described push button signalling, the mode of operation of sim card is switched over.

7. sim card changing method according to claim 6 is it is characterised in that described external key includes: volume plus key And/or volume down key.

8. the switching circuit of client identification module card according to claim 6 is it is characterised in that described control signal is eventually The gpio signal of end processor.

9. sim card changing method according to claim 8 is it is characterised in that described switch chip controls letter according to described Number determine described switch chip output interface working condition step, comprising:

When described intelligent terminal is in open state, described gpio signal is high level signal, and described first output interface disconnects, Described second output interface is opened；Wherein, described second output interface is used for exporting described push button signalling to master chip；

When described intelligent terminal is in off-mode, described gpio signal is low level signal, and described first output interface is opened, Described second output interface disconnects；Wherein, described first output interface is used for exporting described push button signalling to nfc chip interrupt control Interface processed.

10. sim card switching circuit according to claim 9 it is characterised in that: described according to described output mode and described Push button signalling, the step that sim card is switched over, comprising:

When described intelligent terminal is in open state, application program is carried by terminal sim is switched over, described master chip When receiving described push button signalling, execute described external key original function；

When described intelligent terminal is in off-mode, when described nfc chip interrupt control interface detects described push button signalling, Switch sim card according to described push button signalling.