CN102801871B - Radio frequency smart card and control method thereof - Google Patents
Radio frequency smart card and control method thereof Download PDFInfo
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- CN102801871B CN102801871B CN201110403807.6A CN201110403807A CN102801871B CN 102801871 B CN102801871 B CN 102801871B CN 201110403807 A CN201110403807 A CN 201110403807A CN 102801871 B CN102801871 B CN 102801871B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention provides a radio frequency smart card, which comprises a micro control unit (MCU), a radio frequency module and a timer, wherein the timer is used for awakening the MCU in a suspended state at preset time or in a preset mode; and the radio frequency module outputs a varied voltage signal when receiving data, and the varied voltage signal serves as an external interrupt signal of the MCU to awaken the MCU. The invention also provides a method for controlling the radio frequency smart card. According to the method, standby power consumption can be lowered by software control over the receiving time of each radio frequency channel and the sleep mode time of the radio frequency smart card.
Description
Technical field
The present invention relates to the smart card techniques of communication technical field, relate in particular to the smart card techniques of mobile payment field band radio-frequency enabled.
Background technology
Along with the development of the development of wireless communication technology, particularly close range communication techniques, mobile phone mobile payment the short distance wireless communication technology has had the application of scale in social life.The carrier that can realize this application technology is radio frequency smart card and the reader/writer module that can identify this card.
Radio frequency smart card is combined by a radio-frequency module+sim module, consistent with traditional SIM card in profile.Sim module completes traditional telecommunication service, and radio frequency smart card can complete new business function, the function that for example access card, credit card, small amount payment card, attendance card and other smart card can complete.Radio frequency smart card, due to the RF module newly increasing (being radio-frequency module, lower same), has been expanded the business that Mobile phone card can carry greatly.Make people carry a mobile phone that radio frequency smart card is housed, just can realize the many application in the daily lifes such as gate inhibition, work attendance, consumption.
But, because radio frequency smart card has increased RF, be radio-frequency module and some other necessary electronic devices and components, when increasing product function, also increased the power consumption of product.In the situation that cell-phone battery electric-charge quantity does not increase, the cell phone standby time significantly shortens.The use inconvenience that this will cause user, even can make people refuse to use this new product.
Summary of the invention
The invention provides a kind of radio frequency smart card and control method thereof of effective reduction stand-by power consumption.
The invention provides a kind of radio frequency smart card, comprise MCU and radio-frequency module, described radio frequency smart card also comprises timer, for the MCU in halted state being waken up under Preset Time or pattern.
Preferably, described timer is integrated on MCU or radio-frequency module or is element independently.
Preferably, the voltage signal of exporting change when radio-frequency module receives data, the voltage signal of described variation wakes described MCU up as the external interrupt signal of MCU.
The present invention also provides a kind of control method of radio frequency smart card, and this method comprises the steps:
A: software sets frequency-hopping method, carries out initialization to radio-frequency devices;
B:MCU drives radio-frequency module to enter data receiver pattern, and MCU sets after outside arousal function and low-power consumption timer arousal function, enters shutdown mode;
C: if radio-frequency module receives data, wake MCU up by external interrupt wakeup function, after MCU is waken up, proceed to step e;
D: radio-frequency module does not receive data, can not wake MCU up, in such cases, after low-power consumption timer timing arrives, wakes MCU up, after MCU is waken up, proceeds to next step;
E:MCU is waken up, and according to predefined software frequency-hopping method, resets the receiving channels of next radio-frequency module, gets back to step B.
Preferably, in step B, when all default receiving channelss are all intercepted, been scanned and do not receive data, MCU resets low-power consumption timer, enters park mode, and in this pattern, radio-frequency module also enters standby mode.
Preferably, the park mode time of time of reception and the radio frequency smart card by each channel of software control.
By above radio frequency smart card and control method thereof, increase timer and control the time of reception of each channel and the park mode time of radio frequency smart card with software and neither affect the application of wireless radiofrequency function, simultaneously can be by power-dissipation-reduced in critical field, increase RF intelligent card function, the power consumption increasing is less than 5%, does not substantially affect the stand-by time of battery of mobile phone.Due to the further reduction of power consumption, can also promote mobile phone and radio frequency smart card fitting percentage.Content of the present invention can make the user satisfaction of this product of radio frequency smart card be improved.
Accompanying drawing explanation
Fig. 1 is radio frequency smart card module frame chart of the present invention;
Fig. 2 is radio frequency smart card working time slot figure;
Fig. 3 is the control method flow chart of radio frequency smart card of the present invention.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, the present invention is described in further detail.
As shown in Figure 1, be radio frequency smart card module frame chart of the present invention, wherein sim module completes traditional telecommunication service, by chip operating system, completes carried business function and the management of power consumption.The invention provides a kind of radio frequency smart card, comprise MCU, described radio frequency smart card also comprises timer, and described MCU enters shutdown mode after setting described timer arousal function, when described timer timing to after wake the MCU in shutdown mode up.The voltage signal of exporting change when radio-frequency module receives data, the voltage signal of described variation wakes described MCU up as the external interrupt signal of MCU.Wherein, described timer is integrated in MCU above or is integrated in RF module, and certainly, timer can be also an independently device.
Based on described radio frequency smart card, in this card, there are main following 2 devices and corresponding mode of operation:
A: control the MCU of radio-frequency module, have 2 kinds of mode of operations, general mode and shutdown modes at least.When MCU is operated in general mode, control the data transmit-receive work of radio-frequency module, now MCU current drain is in mA level; When MCU is operated in shutdown mode, radio-frequency module is not controlled, self entered the state that power consumption is extremely low, CPU core and all peripheral hardwares all quit work, and only leave external interrupt wakeup function and low-power consumption timer arousal function.Now, MCU current drain is in tens uA ranks.
B: radio-frequency module has 2 kinds of mode of operations, data transmit-receive pattern and standby mode.Data transmit-receive pattern belongs to normal mode of operation, and power consumption is in mA rank; Standby mode, radio-frequency module stops data transmit-receive work, and power consumption is in tens uA ranks.
C: in above-mentioned steps A, external interrupt wakeup function refers to, when radio-frequency module data send or receive, radio-frequency module, by an IO pin level upset on MCU, wakes MCU up; Low-power consumption timer arousal function refers to, a frequency is set very low, thereby also extremely low timer of power consumption wakes MCU up from shutdown mode, thereby controls the work such as frequency hopping, data transmit-receive of radio-frequency devices.Pay special attention to, this low-power consumption timer is generally all integrated in MCU the inside, also can be integrated in RF device the inside, can also be an independently timer.In one embodiment, this timer is inner at MCU, RC running clock source, and frequency range 32K～80KHz, typical frequencies 40KHz, can be referred to as LSI, i.e. Low Speed InternalRC Oscillator.When this timer work, typical current drain is 0.65uA 40KHz, and maximum is no more than 1.2uA80KHz.In above-mentioned steps B, the mode of operation of radio-frequency module is controlled by MCU completely.As shown in Figure 2, for radio frequency smart card working time slot figure, within the operating time of radio-frequency module, MCU be divided into the operating time and downtime 2 kinds of patterns.Within the operating time, consume larger electric current; Within downtime, MCU current drain is very low.Than the operating time, negligible.Wherein, the single channel of described MCU refers on a channel work-downtime, and MCU is waken up rear work and reenters the one-period of shutdown mode, comprises single channel operating time of MCU and the single channel of MCU downtime.The single channel operating time of described MCU referred in the time of intercepting at a channel, the time that MCU is in running order; The single channel of MCU refers in the time of intercepting at a channel time of MCU in shutting down, now to only have the operating state of RF in intercepting downtime.On same channel, refer to: radio-frequency module is operated in frequency-hopping mode, so-called frequency hopping, radio-frequency module receives at a fixed time on a channel, if time is up, changes a channel and continues to receive.So circulation.Such as, RF being set and in 5 channels, working, each channel evenly receives 1mS.Be that channel 1 receives 1mS, then channel 2 receives 1mS... channel 5 and receives 1mS, and then RF device dormancy, after dormancy time arrives, starts the reception work of a new round from channel 1.
As shown in Figure 3, be the control method flow chart of radio frequency smart card of the present invention, a kind of control method of radio frequency smart card is provided, this method comprises the steps:
A: software sets frequency-hopping method, carries out initialization to radio-frequency devices;
B:MCU drives radio-frequency module to enter data receiver pattern, and MCU sets after outside arousal function and low-power consumption timer arousal function, enters shutdown mode;
C: if radio-frequency module receives data, wake MCU up by outside arousal function, after MCU is waken up, proceed to step e;
D: radio-frequency module does not receive data, can not wake MCU up, in such cases, after low-power consumption timer timing arrives, wakes MCU up, after MCU is waken up, proceeds to next step;
E:MCU is waken up, and according to predefined software frequency-hopping method, resets the receiving channels of next radio-frequency module, gets back to step B.
In step B, when all default receiving channelss are all intercepted, been scanned and do not receive data, MCU resets low-power consumption timer, enters long shutdown mode, is called park mode, and in this pattern, radio-frequency devices also enters standby mode.Now, the current drain of radio frequency smart card is extremely low, greatly about 20uA left and right.
In above-mentioned steps B and step e, MCU is in mode of operation, but because MCU only need to reset RF device working channel and reset low-power consumption timer, thereby the operating time is very short, in 1mS, thereby the power consumption of MCU is also very low.The park mode time of time of reception and radio frequency smart card by each channel of software control, can control the size of average stand-by power consumption.By software, arranged, this timer timing length has 2: single channel receives the timing of duration, refer to that MCU is operated in frequency modulation pattern, the time of reception of each channel is fixed, within at a fixed time, RF device is not received data, and this timer wakes MCU up, after MCU wakes up, RF is set and enters another channel reception data; The timing of radio-frequency module sleep time, refers to that and RF device is not received any data, at MCU, RF is set to enter park mode, self enters shutdown mode, to save current drain simultaneously yet if all channels are intercepted completely successively.
By the control method of above step, neither affect the application of wireless radiofrequency function, can by power-dissipation-reduced in critical field, increase RF intelligent card function simultaneously, the power consumption of increase approximates greatly the RF device operating time.The electric current that RF device is operated in receiving mode is generally 15mA left and right, and with RF device work in 1 second 4 times, each operating time is that 5mS calculates: average current=(4*5*15)/1000=0.3mA=300uA that RF device consumes.The mobile phone of selling on open market, standby current is generally all in 10mA, if take average standby current calculates as 6mA, radio frequency smart card has increased after RF smart card module, the current drain increasing is less than 5% of former stand-by power consumption, does not substantially affect the stand-by time of battery of mobile phone.Due to the further reduction of power consumption, can also promote mobile phone and radio frequency smart card fitting percentage.Content of the present invention can make the user satisfaction of this product of radio frequency smart card be improved.
Be understandable that, for the person of ordinary skill of the art, can make other various corresponding changes and distortion by technical conceive according to the present invention, and all these change and distortion all should belong to the protection range of the claims in the present invention.
Claims (3)
1. a control method for radio frequency smart card, is characterized in that: this method comprises the steps:
A: software sets frequency-hopping method, carries out initialization to radio-frequency module;
B:MCU drives radio-frequency module to enter data receiver pattern, and MCU sets after outside arousal function and low-power consumption timer arousal function, enters shutdown mode;
C: if radio-frequency module receives data, wake MCU up by external interrupt wakeup function, after MCU is waken up, proceed to step e;
D: radio-frequency module does not receive data, can not wake MCU up, in such cases, after low-power consumption timer timing arrives, wakes MCU up, after MCU is waken up, proceeds to next step;
E:MCU is waken up, and according to predefined software frequency-hopping method, resets the next receiving channels of radio-frequency module, gets back to step B.
2. the control method of radio frequency smart card as claimed in claim 1, it is characterized in that: in step B, when all default receiving channelss are all intercepted, been scanned and do not receive data, MCU resets low-power consumption timer, enter park mode, in this pattern, radio-frequency module also enters standby mode.
3. the control method of radio frequency smart card as claimed in claim 2, is characterized in that: the park mode time of time of reception and radio frequency smart card by each channel of software control.
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| CN201110403807.6A CN102801871B (en) | 2011-12-07 | 2011-12-07 | Radio frequency smart card and control method thereof |
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| CN201110403807.6A CN102801871B (en) | 2011-12-07 | 2011-12-07 | Radio frequency smart card and control method thereof |
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| CN102801871B true CN102801871B (en) | 2014-01-22 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105322977B (en) * | 2015-11-10 | 2017-08-29 | 上海十贝电子科技有限公司 | A kind of active RFID tag low power consumption data reception device and its method |
| CN105307251B (en) * | 2015-11-13 | 2019-05-31 | 蓝燕 | A kind of low-power consumption Internet of Things module and its control method |
| CN105511345B (en) * | 2015-11-30 | 2019-02-26 | 惠州爱镝威电气有限公司 | A kind of Zigbee Internet of Things module and its Low-power-consumptiocontrol control method |
| CN106228098A (en) * | 2016-07-12 | 2016-12-14 | 华立科技股份有限公司 | Electric energy meter radio-frequency module low-power consumption inspection X 2 method |
| CN112055404A (en) * | 2020-10-15 | 2020-12-08 | 力同科技股份有限公司 | Communication device and standby method thereof |
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| EP1677424A2 (en) * | 2005-01-04 | 2006-07-05 | Samsung Electronics Co., Ltd. | Apparatus and method for reducing electric power consumption in mobile communication terminal |
| CN101727599A (en) * | 2008-10-30 | 2010-06-09 | 国民技术股份有限公司 | Software method for reducing standby power consumption of radio frequency SIM card |
| CN101742619A (en) * | 2008-11-06 | 2010-06-16 | 国民技术股份有限公司 | Method for reducing stand-by power consumption of radio-frequency SIM (subscriber identity module) card by sequential trigger |
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| US5794137A (en) * | 1995-07-17 | 1998-08-11 | Ericsson Inc. | Method for increasing stand-by time in portable radiotelephones |
| EP1677424A2 (en) * | 2005-01-04 | 2006-07-05 | Samsung Electronics Co., Ltd. | Apparatus and method for reducing electric power consumption in mobile communication terminal |
| CN101727599A (en) * | 2008-10-30 | 2010-06-09 | 国民技术股份有限公司 | Software method for reducing standby power consumption of radio frequency SIM card |
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Address after: 518055 1407 floor, 14 floor, Fuguang business building, 1 Nanshan District Road, Taoyuan, Shenzhen, Guangdong Patentee after: Shenzhen Bureau of Polytron Technologies Inc Address before: 301401, building six, building B, No.1 building, No.1 Industrial Road, Nanshan District, Guangdong, Shenzhen, 518055 Patentee before: Shenzhen Zhongke Xunlian Technology Co., Ltd |