CN102110237B - Processing method for lowering power consumption of multi-interface IC (Integrated Circuit) card pin - Google Patents
Processing method for lowering power consumption of multi-interface IC (Integrated Circuit) card pin Download PDFInfo
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- CN102110237B CN102110237B CN2009102434856A CN200910243485A CN102110237B CN 102110237 B CN102110237 B CN 102110237B CN 2009102434856 A CN2009102434856 A CN 2009102434856A CN 200910243485 A CN200910243485 A CN 200910243485A CN 102110237 B CN102110237 B CN 102110237B
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Abstract
The invention discloses a processing method for lowering the power consumption of a multi-interface (joint) IC (Integrated Circuit) card pin, which is mainly applied to the field of designing the multi-interface IC card system, namely double-interface IC cards (supporting ISO/IEC (International Standardization Organization/ International Electrotechnical Commission) 7816 and radio frequency), three-interface IC cards (supporting ISO/IEC 7816, radio frequency and USB (Universal Serial Bus)) and the like. A special pin processing method is adopted by the invention, and the power consumption of the pin of the multi-interface IC card is effectively lowered.
Description
Technical field
The present invention is applied to the system design field of many interface IC cards.
Background technology
Along with the development of IC-card designing technique, IC-card application in daily life more and more widely, function is also more and more diversified.From single face (only supporting ISO/IEC 7816 interfaces or radio frequency interface), single application, to many interfaces (supporting ISO/IEC 7816 interfaces, radio frequency interface, USB interface etc.), many application developments.Therefore the system design of IC-card also becomes increasingly complex, and the quality of system design has directly determined the performance of IC-card.
Generally, many interface IC cards need carry out some special processings to pin.Such as the double-interface IC card of supporting ISO/IEC 7816 and radio frequency interface, receive fixing level (use usually draw or pull down resistor is realized) to the input pin of contact mode.These pins are outside under rf-mode does not drive, if above-mentioned processing is not carried out in inside, chip can't operate as normal, so this is the needs of rf-mode operate as normal, and this also can improve the chip reliability of contact when powering on simultaneously.But above-mentioned disposal route can be brought two problems:
(1) power consumption becomes big when contact mode is worked.
(2) resistance of drop-down (on draw) resistance is selected improperly, possibly cause the electrical characteristics (I of pin
IHOr I
IL) do not satisfy corresponding standard (such as ISO/IFC 7816 standards).
The disclosed many interface IC cards pin of the present invention low-power consumption treatment method can be good at addressing the above problem; When satisfying requirement of system design, can eliminate the unnecessary power consumption of IC-card.
Summary of the invention
The present invention is intended to reduce through a kind of many interface IC cards pin low-power consumption treatment method the power consumption of IC-card, specifically may further comprise the steps:
(1) the digital input pin of IC-card has controlled drop-down (on draw) resistance.
Numeral input pin drop-down (on draw) resistance was effective when (2) IC-card powered on.
(3) the inner mode of operation signal (mode signal that produces is surveyed in mode signal or IC-card inside according to the IC-card outside is sent into) that produces of IC-card.
(4) whether IC-card is effective according to drop-down (on draw) resistance of mode of operation signal controlling input pin.
Description of drawings
Many interface IC cards of Fig. 1 pin control flow chart
Fig. 2 pin pull-down control circuit is realized synoptic diagram; PAD is the input pin external interface among the figure, and IN is an interface inner and kernel circuitry, and EN is the control end of pull down resistor; INTER_RST is the internal reset signal of chip, and CHIP_MODE is the mode of operation signal of chip.Hardware generates pin pull-down control signal according to INTER_RST and CHIP_MODE signal.
Draw control circuit to realize synoptic diagram on Fig. 3 pin; PAD is the input pin external interface among the figure, and IN is an interface inner and kernel circuitry, and EN is the control end of pull-up resistor; INTER_RST is the internal reset signal of chip, and CHIP_MODE is the mode of operation signal of chip.Hardware generates drawing control signal on the pin according to INTER_RST and CHIP_MODE signal.
Embodiment
Be that example describes with two interfaces (supporting ISO/IEC 7816 interfaces and radio frequency interface) IC-card below, other many interface IC cards also can similarly be realized.
In when work under rf-mode, several input ports of 7816 (CLK, RST) must remain on fixing level, promptly can not be unsettled, so these pins need drop-down (on draw) resistance to control to fixed level.When 7816 patterns were worked, these are drop-down (on draw), and resistance can increase working current; Therefore this moment, there was direct driving this several ports outside, can not have drop-down (on draw) resistance.In 7816 pattern power up, drop-down (on draw) resistance of input pin can effectively improve the reliability of IC-card.Comprehensive above-mentioned situation, the reliability when powering in order to improve IC-card is eliminated the unnecessary power consumption of IC-card simultaneously, when system design, takes following a series of pin disposal measure:
(1) in design during this IC-card, input pin will be selected for use with the IO of drop-down (on draw) resistance and have a controlled port whether effectively to control it.
(2) drop-down in the initial power up of IC-card (on draw) resistance must be effectively, and this is that level for input port in power up keeps specific value, rather than unsettled vacant state.
(3) whether drop-down in order to select (on draw) resistance remains valid, and mode signal or the inner mode signal that produces of surveying of IC-card sent into according to the IC-card outside are at the inner mode of operation signal that generates IC-card of IC-card.Double-interface IC card all can have the mode detection circuit in inside generally speaking, and its principle is the source decision mode of operation of the power supply when powering on.When powering on, power supply is from the power pin of IC-card, and pattern is exactly 7816 patterns; When powering on, power supply is responded to from radio-frequency field, and pattern is exactly a rf-mode.
(4) if rf-mode, for untapped 7816 pins, drop-down (on draw) resistance continues to remain valid, promptly drop-down (on draw) enables control signal EN continuously effective, guarantees that the K switch 1 of drop-down (on draw) resistance is opened (like Fig. 2, shown in Figure 3) all the time.If 7816 patterns, after electrification reset is accomplished, break off drop-down (on draw) resistance, make drop-down (on draw) resistance invalid, promptly drop-down (on draw) enables control signal EN and becomes invalidly, guarantees that the K switch 1 of drop-down (on draw) resistance is closed (like Fig. 2, shown in Figure 3).
Wherein step 1 is the selection requirement of design initial to IO, and step 2-4 is the actual mechanical process of IC-card, and the whole operation process can accomplished automatically by hardware, also can be accomplished by software-hardware synergism.
Other many interface IC cards can be handled input pin according to above-mentioned same method, to reach the low-power consumption of pin.When using with input mode, also can handle, to reach the low-power consumption of pin according to same principle for two-way IO.
Claims (3)
1. the pin low-power consumption treatment method of interface IC card more than a kind, whether the mode of operation decision after it is characterized in that powering on according to IC-card enables the pull down resistor or the pull-up resistor of digital input pin, reduces the pin power consumption with this, and step is following:
(1) the digital input pin of IC-card is provided with controlled pull down resistor or pull-up resistor;
Enable digital input pin pull down resistor or pull-up resistor when (2) IC-card powers on;
(3) mode signal or the inner mode signal that produces of surveying of IC-card sent into according to the IC-card outside, the inner mode of operation signal that produces of IC-card;
(4) whether IC-card enables the pull down resistor or the pull-up resistor of input pin according to the mode of operation signal controlling.
2. the pin low-power consumption treatment method of a kind of many interface IC cards as claimed in claim 1; It is characterized in that if the mode of operation of IC-card is a rf-mode; For the employed clock input pin of ISO/IEC 7816 interface communication protocols CLK, input pin RST resets; Continue to enable drop-down or pull-up resistor, guarantee that switch drop-down or pull-up resistor opens all the time.
3. the pin low-power consumption treatment method of a kind of many interface IC cards as claimed in claim 1; It is characterized in that if the mode of operation of IC-card is the pattern that ISO/IEC 7816 interface communication protocols communicate; After electrification reset is accomplished; Break off drop-down or pull-up resistor, make drop-down or pull-up resistor invalid, guarantee that switch drop-down or pull-up resistor is closed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009102434856A CN102110237B (en) | 2009-12-23 | 2009-12-23 | Processing method for lowering power consumption of multi-interface IC (Integrated Circuit) card pin |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102434856A CN102110237B (en) | 2009-12-23 | 2009-12-23 | Processing method for lowering power consumption of multi-interface IC (Integrated Circuit) card pin |
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| CN102110237A CN102110237A (en) | 2011-06-29 |
| CN102110237B true CN102110237B (en) | 2012-11-14 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9811145B2 (en) * | 2012-12-19 | 2017-11-07 | Intel Corporation | Reduction of idle power in a communication port |
| CN104635589B (en) * | 2015-02-03 | 2017-08-29 | 成都秦川物联网科技股份有限公司 | A kind of intersubjective low power loss communication system and method for different electrical power |
| CN109347324A (en) * | 2018-11-21 | 2019-02-15 | 晶晨半导体(上海)股份有限公司 | Power circuit and the method for reducing power supply output error |
Citations (3)
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| CN1581220A (en) * | 2003-08-12 | 2005-02-16 | 上海华虹集成电路有限责任公司 | Toutch and nou-toutch type working-mode changing-over method in double interface card |
| CN101004798A (en) * | 2006-12-30 | 2007-07-25 | 凤凰微电子（中国）有限公司 | Smart card of supporting high performance computing, large capacity storage, high-speed transmission, and new type application |
| CN101105761A (en) * | 2006-07-12 | 2008-01-16 | 上海华虹集成电路有限责任公司 | Emulator of contact type intelligent card with USB interface |
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2009
- 2009-12-23 CN CN2009102434856A patent/CN102110237B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1581220A (en) * | 2003-08-12 | 2005-02-16 | 上海华虹集成电路有限责任公司 | Toutch and nou-toutch type working-mode changing-over method in double interface card |
| CN101105761A (en) * | 2006-07-12 | 2008-01-16 | 上海华虹集成电路有限责任公司 | Emulator of contact type intelligent card with USB interface |
| CN101004798A (en) * | 2006-12-30 | 2007-07-25 | 凤凰微电子（中国）有限公司 | Smart card of supporting high performance computing, large capacity storage, high-speed transmission, and new type application |
Non-Patent Citations (1)
| Title |
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| 张子武等.《ISO/IEC7816-3串行通信协议的FPGA实现》.《现代电子技术》.2008,(第3期),164-165. * |
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Address after: 102209 Beijing, Beiqijia, the future of science and technology in the south area of China electronic network security and information technology industry base C building, Patentee after: Beijing CEC Huada Electronic Design Co., Ltd. Address before: 100102 Beijing City, Chaoyang District Lize two Road No. 2, Wangjing science and Technology Park A block five layer Patentee before: Beijing CEC Huada Electronic Design Co., Ltd. |