CN102930327A

CN102930327A - Intelligent power supply method for SIM (Subscriber Identity Module) card with sticker card

Info

Publication number: CN102930327A
Application number: CN2012103431626A
Authority: CN
Inventors: 张玉禄; 李艳华
Original assignee: WISE SECURITY TECHNOLOGY (BEIJNG) Co Ltd
Current assignee: WISE SECURITY TECHNOLOGY (BEIJNG) Co Ltd
Priority date: 2012-09-14
Filing date: 2012-09-14
Publication date: 2013-02-13
Anticipated expiration: 2032-09-14
Also published as: CN102930327B

Abstract

The invention discloses an intelligent power supply method for SIM (Subscriber Identity Module) card with a sticker card, relating to the technical field of NFC (Near Field Communication). According to the method, the power supply mode of the sticker card is determined by determining the pin voltage level of CLK, RST and I/O (Input/Output) pins from 7816 interfaces on the sticker card and the maintenance time of consistent low level so as to determine whether to switch off an SIM card power supply, the SIM card power supply can be automatically controlled, the SIM energy consumption is reduced, and the working time of a CLF (Contactless Front end) power supply is facilitated to prolong.

Description

SIM card intelligent power supply method with pasting card

Technical field

The present invention relates to the NFC communication technical field, be specifically related to a kind of SIM card intelligent power supply method with pasting card.

Background technology

Pasting card is not in the market also supported NFC(Near Field Communication, near-field communication) uses, but the market environment of using along with NFC is ripe gradually, require pasting card can support the application of NFC, as shown in Figure 1, namely need the protocol with SWP(single wire) pasting card of interface.The NFC application requirements is as CLF(contactless front end, non-contact front-end, also be called the field) when pasting card is powered, need to turn off the power supply of common SIM card and save power consumption, so pasting card need to judge that the working power of himself is to be provided or provided by CLF by baseband chip.

Summary of the invention

The invention provides a kind of SIM card intelligent power supply method with pasting card, can accurately judge the power supply source of pasting card, and the power supply of control SIM card.

The invention provides a kind of SIM card intelligent power supply method with pasting card, comprise step:

A: detect on the pasting card from CLK, the RST of 7816 interfaces, the pin voltage of I/O pin;

B: whether the pin voltage of judging described CLK, RST, I/O pin is low level, and if so, then execution in step C if not, then keeps the SIM card power supply and returns steps A;

C: judge whether holding time greater than 100ms of low level voltage on described CLK, RST, the I/O pin, if so, then execution in step D if not, then keeps the SIM card power supply and returns steps A;

D: turn-off the SIM card power supply and return steps A.

Preferably, be 500KHZ from CLK, the RST of 7816 interfaces, the detection clock that the pin voltage of I/O pin adopts on the described detection pasting card.

Technique scheme can be found out, pass through to detect CLK, the RST of 7816 interfaces on the pasting card, the pin level of I/O pin in the embodiment of the invention, thereby judge the power supply source of the pasting card that links to each other with SIM card, in case pasting card is powered by CLF, then can disconnect the power supply of SIM card, realize the automatic control of SIM card power supply, saved the SIM energy resource consumption, be conducive to prolong the working time of CLF power supply.

Description of drawings

In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.

Fig. 1 is the NFC communication structure with the SIM card of pasting card;

Fig. 2 is with the process flow diagram of the SIM card intelligent power supply method of pasting card in the embodiment of the invention;

Fig. 3 is when pasting card is powered by baseband chip in the embodiment of the invention, CLK from 7816 interfaces, RST, the level sequential chart on the I/O pin.

Embodiment

Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making all other embodiment that obtain under the creative work prerequisite.

Embodiment:

The embodiment of the invention provides a kind of SIM card intelligent power supply method with pasting card, as shown in Figure 2, comprises step:

101: detect on the pasting card from CLK, the RST of 7816 interfaces, the pin voltage of I/O pin.

By among Fig. 1 with the NFC communication structure of the SIM card of pasting card as can be known, SIM card links to each other with pasting card by master's 7816 interfaces of pasting card, pasting card is by linking to each other with baseband module from 7816 interfaces, the power supply of SIM card is provided indirectly by pasting card, be that pasting card receives CLF power supply or baseband module power supply and exports to and make SIM card work on the SIM card, pasting card self detects its CLK from 7816 interfaces in this step, the pin level of RST and I/O pin, the control module of pasting card inside can detect described CLK by clock scan, RST, the pin voltage of I/O pin provides preparation so that the power supply mode of coupled SIM card (power supply source) made a decision.

102: whether the pin voltage of judging described CLK, RST, I/O pin is low level.

After in previous step, pasting card being made detection from the pin voltage of CLK, the RST of 7816 interfaces, I/O pin, need in this step the pin voltage of described CLK, RST, I/O pin is judged, relation between the power supply source of the combination of the state of NFC terminal device (for example NFC mobile phone) and pasting card and corresponding pasting card, (card in the table is pasting card) as shown in the table:

Can find out that in conjunction with Fig. 1 and upper table in the NFC mobile phone, the linking to each other with baseband chip (baseband chip the baseband module) from 7816 interfaces of pasting card, the VCC pin of pasting card links to each other with the CLF chip.When mobile phone had electricity, the power supply of pasting card came from the baseband chip of mobile phone, and also being driven by baseband chip from 7816 interfaces of pasting card controlled.When mobile phone does not have electricity, if this moment pasting card (CLF) on the scene inner (being that pasting card is in the induction range of CLF), the power supply of pasting card comes from the field, pasting card do not have driven from 7816 interfaces; If in pasting card was absent from the scene at this moment, pasting card did not have electricity.

When pasting card was not driven by cellular phone power supplies, also not having from 7816 interfaces of linking to each other with pasting card was driven, on the pasting card from the CLK of 7816 interfaces, RST, the pin voltage of I/O pin is low level entirely, as shown in Figure 3.And when described when being driven control from 7816 interfaces by baseband chip, only in cold reset, described CLK, RST, the voltage of I/O pin just entirely be low level a period of time (≤100ms), remaining the time can not be low level entirely.Therefore, in case the control module in the pasting card detects from the above CLK of 7816 interfaces, RST, when the pin voltage of I/O pin is low level, then can further judge described CLK by step 103, RST, holding time whether greater than 100ms of low level voltage on the I/O pin, if in the step 103, control module in the pasting card detects described CLK, RST, holding time greater than 100ms of low level voltage on the I/O pin, the power supply mode that then can determine pasting card this moment is the CLF power supply, so can enter into step 105: turn-off the SIM card power supply, namely pasting card is not powered indirectly for SIM card.Turn-off the SIM card power supply this moment and can make the CLF power supply reduce output, save the consumption of CLF power supply.

Be understandable that so, in step 102, if the control module in the pasting card detects described CLK, RST, the pin voltage of I/O pin is not that all (part is high level for low level, part is low level) time, perhaps in step 103, control module in the pasting card detects described CLK, RST, when being the holding time of low level voltage≤100ms on the I/O pin, can determine that then pasting card powers by baseband chip, therefore, need to enter into step 104 this moment: keep the SIM card power supply, be that pasting card continues as SIM card and indirectly powers, guarantee the SIM card normal operation.

Be 500KHZ from CLK, the RST of 7816 interfaces, the detection clock frequency that the pin voltage of I/O pin adopts on the described detection pasting card.Detect according to the power supply mode of the clock frequency in the pasting card (clock frequency in the pasting card is 500KHZ) to pasting card, whether there is switching (baseband chip power supply and a switching of power supply) with the power supply mode of determining pasting card, therefore, no matter be to keep in the step 104 to turn-off the SIM card power supply in SIM power supply or the step 105 and all need to turn back to after carrying out in the step 101 rescaning detection from 7816 interfaces on the pasting card.

In the embodiment of the invention take pasting card as core the power supply mode to himself judge, different power supply modes according to pasting card, select the duty of SIM card power supply, thereby reduced the energy resource consumption of SIM, save the energy resource consumption of CLF power supply, increased the working time of NFC terminal device.

One of ordinary skill in the art will appreciate that all or part of step in the whole bag of tricks of above-described embodiment is to come the relevant hardware of instruction finish by program, this program can be stored in the computer-readable recording medium, storage medium can comprise: ROM (read-only memory) (ROM, Read Only Memory), random access memory (RAM, Random Access Memory), disk or CD etc.

More than a kind of SIM card intelligent power supply method with pasting card that the embodiment of the invention is provided be described in detail, used specific case herein principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.

Claims

1. with the SIM card intelligent power supply method of pasting card, it is characterized in that, comprise step:

D: turn-off the SIM card power supply and return steps A.

2. the SIM card intelligent power supply method with pasting card as claimed in claim 1 is characterized in that: be 500KHZ from CLK, the RST of 7816 interfaces, the detection clock that the pin voltage of I/O pin adopts on the described detection pasting card.