CN103325409A - Memory card with smart cart function, memory card power supply control method, and memory card power supply control circuit - Google Patents
Memory card with smart cart function, memory card power supply control method, and memory card power supply control circuit Download PDFInfo
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Abstract
The invention relates to a memory card with a smart card function, a memory card power supply control method, and a memory card power supply control circuit. The memory card comprises a flash memory unit, a data processing control unit and a power supply control unit, wherein the data processing control unit is coupled to the flash memory unit, controls the flash memory unit, and encrypts/decrypts and stores smart card security data, the power supply control unit is coupled to the data processing control unit and the flash memory unit, the power supply control unit receives at least one of a first power supply input and a second power supply input, and supplies the first power supply input or the second power supply input to the data processing control unit according to at least a control signal, and one output terminal of the power supply control unit is coupled to the first power supply input. In addition, the invention provides the memory card power supply control method and the memory card power supply control circuit.
Description
Technical field
The present invention relates to a kind of power control method and power control circuit, and be particularly related to a kind of storage card and power control method and power control circuit of tool intelligent card function.
Background technology
Along with the user accepts to use stored value card and prepayment Stored Value gradually, make that the use of smart card is universal day by day.Smart card (Smart Card) is to have for example integrated circuit (IC) chip of the assembly of microprocessor, card operation system, security module and storer (IC chip), carries out scheduled operation to allow the holder.Smart card provides calculating, encryption, two-way communication and security function, makes this card can also reach the function that its data of storing are protected except the function of storage data.(Subscriber Identification Module, SIM) card is one of them exemplary applications of smart card to use employed subscriber identification module in the machine-processed cellular phone of global system for mobile communications (GSM).In general, smart card itself is subject to the standard of its integrated circuit, so memory capacity is limited.
Storage card (MEMORY CARD) is a kind of data storage device, and it generally is as storage medium with the NAND flash memory.The NAND flash memory has the advantage that still can preserve data after can writing, can erasing and cut off the power supply, in addition, along with the improvement of manufacturing technology, the NAND flash memory has that volume is little, access speed fast, with advantages such as power consumption is low.Therefore, these those skilled in the art attempt smart card is combined with jumbo storage card in recent years, with the memory capacity of amplification smart card.
In general, if the user wants the data in the accessing memory card to come access by card reader, therefore smart card is being bonded in the application of storage card, also only can is coming to read the interior data of storage card and smart card with contact (contact) by card reader.Yet (many contactless (contactless) induction technology has been widely used in the life for Near Field Communication, development NFC), for example rapid transit ticket card, gate inhibition's card etc. along with wireless near field communication.
Therefore, combined with intelligent card and the storage card that has contactless access facility concurrently just arise at the historic moment, and for example have a microampere digital storage card (Micro Secure Digital, Micro SD) of intelligent card function.When being read by the reading device in the host computer system, this kind storage card receives different power supply inputs under different situations, therefore if appoint when selecting the one power supply in different power supply inputs can't operate as normal for the smart card circuitry of storage card inside, will limit its range of application greatly.
Summary of the invention
The invention provides a kind of storage card with intelligent card function, appoint when selecting the one power supply in the input of different power supply, but its inner smart card circuitry operate as normal.
The invention provides a kind of power control method of storage card, the method can make the dual power supply of the storage card of tool intelligent card function appoint to select the one power supply, but and this moment storage card inside the smart card circuitry operate as normal.
The invention provides a kind of power control circuit, be suitable for being applied in an electronic circuit.Appoint when selecting one and importing so far electronic circuit in the input of different power supply, but this electronic circuit operate as normal.
The present invention proposes a kind of storage card of tool intelligent card function, comprises a flash memory cells, a data processing and control unit and a power control unit.The data processing and control unit is coupled to flash memory cells.Data processing and control unit controls flash memory cells, and encryption and decryption and storage one smart card security data.Power control unit is coupled to data processing and control unit and flash memory cells.Power control unit receive one first power supply input and a second source import both at least one of them.Power control unit selects to provide the input of first power supply or second source to input to the data processing and control unit according at least one control signal, and an output terminal of power control unit is coupled to the input of first power supply.
In one embodiment of this invention, above-mentioned power control unit comprises one first power supply service duct and a second source service duct.The first power supply service duct is in order to receiving first power supply input, and determines whether providing first power supply to input to the data processing and control unit according to one first control signal.The second source service duct is in order to receiving second source input, and determines whether providing second source to input to the data processing and control unit according to one second control signal.First control signal changes its state in response to the first power supply input, to control the first power supply service duct.
In one embodiment of this invention, the first above-mentioned power supply service duct comprises one first on-off element and a signal receiving unit.First on-off element has one first end, one second end and a control end.First termination is received the input of first power supply; Second end is coupled to the output terminal of power control unit.Signal receiving unit has an input end and an output terminal.Input end receives the input of first power supply and it is treated to first control signal; Output terminal is coupled to the control end of first on-off element, and exports first control signal.
In one embodiment of this invention, above-mentioned signal receiving unit comprises a reverser.Reverser has input end and output terminal.Input end receives the input of first power supply, and it is reversed first control signal.Output terminal is coupled to the control end of first on-off element, and exports first control signal.
In one embodiment of this invention, above-mentioned second source service duct comprises a second switch element.The second switch element has one first end, one second end and a control end.First termination is received the second source input; Second end is coupled to the output terminal of power control unit; Control end is in order to receive second control signal.
In one embodiment of this invention, above-mentioned power control unit also comprises a voltage limiting unit.The voltage limiting unit is coupled between first and second power supply service duct, in order to suppress a revers voltage that the first power supply service duct feeds back to the second source service duct less than a particular value, perhaps feed back to the revers voltage of the first power supply service duct less than particular value in order to suppress the second source service duct.
In one embodiment of this invention, above-mentioned voltage limiting unit comprises one first diode and one second diode.First diode has an anode and a negative electrode.Anode is coupled to the input of first power supply; Negative electrode is coupled to first on-off element.Second diode has an anode and a negative electrode.Anode is coupled to the second source input; Negative electrode is coupled to the second switch element.
In one embodiment of this invention, above-mentioned power control unit comprises a partial pressure unit.Partial pressure unit has one first end, one second end and a dividing potential drop node.First end is coupled to the input of first power supply; Second end is coupled to ground.Partial pressure unit is carried out dividing potential drop to first power supply input, and provides first power supply after the dividing potential drop to input to the output terminal of power control unit via the dividing potential drop node.
In one embodiment of this invention, above-mentioned partial pressure unit comprises one first resistance, and the one end is as first end of partial pressure unit, and is coupled to the input of first power supply.The other end of first resistance is as the dividing potential drop node, and provides first power supply after the dividing potential drop to input to the output terminal of power control unit.Second resistance and the first resistance coupled in series.One end of second resistance is coupled to the other end of first resistance, and the other end of second resistance is as second end of partial pressure unit and be coupled to ground.
In one embodiment of this invention, above-mentioned data processing and control unit comprises a memorizer control circuit and a smart card circuitry.Memorizer control circuit couples flash memory cells, and the control flash memory cells.Smart card circuitry is coupled to memorizer control circuit, and encryption and decryption and storage one smart card security data.Smart card circuitry receives the smart card security data or sends handled smart card security data to host computer system by memorizer control circuit from a host computer system.Power control unit selects to provide the input of first power supply or second source to input to smart card circuitry.
In one embodiment of this invention, above-mentioned flash memory cells is also stored the smart card security data.
In one embodiment of this invention, above-mentioned first power supply input is provided by a storage card reading device; The second source input is provided by a wireless near field communication reading device.
The present invention proposes a kind of power control method of storage card.Storage card comprises a power control unit and a data processing and control unit.Power control method comprises the steps.Receive one first power supply input and a second source import both at least one of them.According at least one control signal, select to provide the input of first power supply or second source to input to a smart card circuitry in the data processing and control unit.One output terminal of power control unit is coupled to the input of first power supply.
In one embodiment of this invention, the above-mentioned selection step that provides the input of first power supply or second source to input to smart card circuitry comprises according to one first control signal and determines whether providing first power supply to input to the data processing and control unit.First control signal changes its state in response to the first power supply input, to control the supply of first power supply input.
In one embodiment of this invention, the step that above-mentioned selection provides the input of first power supply or second source to input to smart card circuitry comprises that also reverse first power supply input is as first control signal, to control the supply of first power supply input.
In one embodiment of this invention, the above-mentioned selection step that provides the input of first power supply or second source to input to smart card circuitry also comprises according to one second control signal and determines whether providing second source to input to the data processing and control unit.The input of first power supply is as second control signal.
In one embodiment of this invention, above-mentioned power control method comprises that also suppressing the input of first power supply feeds back to a revers voltage of second source input less than a particular value.
In one embodiment of this invention, above-mentioned power control method comprises that also suppressing the second source input feeds back to the revers voltage of first power supply input less than particular value.
In one embodiment of this invention, above-mentioned power control method also comprises dividing potential drop carried out in first power supply input, and provides first power supply after the dividing potential drop to input to the output terminal of power control unit.
The present invention proposes a kind of power control circuit, comprises one first power supply service duct, one first power supply service duct and a voltage limiting unit.The first power supply service duct is in order to receiving one first power supply input, and determines whether providing first power supply to input to a data processing and control unit according to one first control signal.The second source service duct is in order to receiving second source input, and determines whether providing second source to input to the data processing and control unit according to one second control signal.The voltage limiting unit is coupled between first and second power supply service duct, in order to suppress a revers voltage that the first power supply service duct feeds back to the second source service duct less than a particular value, perhaps suppress the second source service duct and feed back to the revers voltage of the first power supply service duct less than particular value.
In one embodiment of this invention, the input of above-mentioned first power supply or the second source voltage turn-on that inputs to the data processing and control unit loses less than 0.15 volt.
In one embodiment of this invention, above-mentioned particular value is not more than 60% or 1 volt that corresponding power supply is imported.
Based on above-mentioned, storage card provided by the present invention has intelligent card function, can carry out wireless near field communication.And the power control method that provides can make this storage card appoint under the situation of selecting the one power supply at dual power supply, and its inner smart card circuitry all can operate as normal.
For above-mentioned feature and advantage of the present invention can be become apparent, embodiment cited below particularly, and conjunction with figs. is described in detail below.
Description of drawings
Fig. 1 is one exemplary embodiment illustrates according to the present invention storage card and the summary calcspar of its host computer system.
Fig. 2 is the summary calcspar of the power control unit that one exemplary embodiment illustrates according to the present invention.
Fig. 3 is the summary circuit diagram of the power control unit that one exemplary embodiment illustrates according to the present invention.
Fig. 4 is the flow chart of steps of power control method of the storage card of one embodiment of the invention.
Fig. 5 is the flow chart of steps of power control method of the storage card of another embodiment of the present invention.
[main element symbol description]
100: host computer system
110: the storage card reading device
120: the wireless near field communication reading device
200: storage card
210: flash memory cells
220: the data processing and control unit
222: memorizer control circuit
224: smart card circuitry
230,330: power control unit
232,332: the first power supply service ducts
234,334: the second source service duct
236,336: the voltage limiting unit
238,338: partial pressure unit
333: signal receiving unit
Ctrl1: first control signal
Ctrl2: second control signal
P1: first power supply input
P1 ': first power supply input after the dividing potential drop
P2: second source input
OUT: the output terminal of power control unit
Q1: first on-off element
Q2: second switch element
D1: first diode
D2: second diode
N: dividing potential drop node
R1: first resistance
R2: second resistance
S400, S402, S404, S406, S408, S500, S502, S504: the step of power control method
Embodiment
Fig. 1 is one exemplary embodiment illustrates according to the present invention storage card and the summary calcspar of its host computer system.Please refer to Fig. 1, the host computer system 100 of this exemplary embodiment comprises a storage card reading device 110 and a radio communication reading device 120.At this, host computer system 100 for example is a portable electronic communications device (for example mobile phone, flat computer), but the present invention is not limited to this.In this exemplary embodiment, storage card 200 comprises a flash memory cells 210, a data processing and control unit 220 and a power control unit 230.Data processing and control unit 220 comprises a memorizer control circuit 222 and a smart card circuitry 224.Memorizer control circuit 222 couples flash memory cells 210.Smart card circuitry 224 couples memorizer control circuit 222.Storage card 200 for example is one microampere of digital (Micro SD) storage card, and its combined with intelligent card also has contactless access facility concurrently.Therefore, the storage card reading device 110 of this exemplary embodiment for example is one microampere of digital storage card reading device.In addition, in this exemplary embodiment, flash memory cells 210, data processing and control unit 220 and power control unit 230 can be implemented with one chip individually, perhaps also all functions can be incorporated in the one chip and realize.
Storage card reading device 110 meets SD specification data form in order to identification and converts 100 forms that can identify of host computer system to.Specifically, the storage card reading device 110 of present embodiment is in order to connect storage card 200, storage card 200 for example is to be inserted in the storage card reading device 110 in separable mode, so that host computer system 100 can be carried out access by 110 pairs of storage cards that insert of storage card reading device 200.In this exemplary embodiment, the user can be inserted into storage card reading device 110 with storage card 200, to be connected with host computer system 100, meets contact (contact) communication of ISO 7816-3 standard.For example, user's paying behavior that the storage card 200 with financial smart card secure data can be inserted into storage card reading device 110 and be undertaken by host computer system 100 and internet (Internet) doing shopping on the line.
Radio communication reading device 120 can be in order to receive and dispatch the RF signal, with with reading device (RF reader for example, do not illustrate) carry out data transmission, data transmission manner for example be meet the wireless near field communication standard (Near Field Communication, NFC) or other kind radio communication standards.That is to say, in this exemplary embodiment, the user can be inserted into storage card reading device 110 with storage card 200 and utilize wireless near field communication reading device 120 and other contactless reading devices to meet contactless (contactless) wireless near field communication of ISO14443 standard.For example, the user can be inserted into storage card reading device 110 with the storage card 200 with rapid transit ticket smart card security data.When taking rapid transit, communicate by letter with the reading device that is configured in the rapid transit station and pay in contactless mode, perhaps the user can be inserted into the storage card 200 with financial smart card secure data storage card reading device 110 and communicate by letter with the reading device that is configured in the hotel owner when doing shopping relevant hotel owner (for example, refuelling station, convenience store) and pay in contactless mode.
Data processing and control unit 220 is in order to the running of control store card 200, and it utilizes memorizer control circuit 222 control flash memory cells 210, and utilizes smart card circuitry 224 encryption and decryption and storage one smart card security data.In this exemplary embodiment, smart card circuitry 224 for example is that (Universal Integrated Circuit Card, UICC), storage comprises information such as user profile, golden key password, way of paying to a Universal Integrated Circuit Card.Smart card circuitry 224 receives the smart card security data or sends handled smart card security data to host computer system 110 (or send main frame by a wireless messages transmitting element) by memorizer control circuit 222 from host computer system 100.In general, because the data security of smart card circuitry 224 is quite high, therefore use smart card circuitry 224 handled smart card security data to can be used as application such as authentication, small amount payment.For example, these smart card security data are public transportation ticket data, finance data etc.In exemplary embodiment of the present invention, the interface of smart card circuitry 224 (interface) is to meet ISO 7816-3 and ISO14443 standard.Yet, the invention is not restricted to this, smart card circuitry 224 also can be the higher data protection mechanism of other safe classes.What deserves to be mentioned is, smart card circuitry 224 employed encryptions, decryption method are for meeting advanced encryption standard (Advanced Encryption Standard, AES), data encryption standards (Data Encryption Standard, DES), three-phase data encryption standard (Triple Data Encryption Standard, 3DES), rivest, shamir, adelman (Rivest Shamir Adleman, RSA).
For example, in this exemplary embodiment, but memorizer control circuit 222 comprises in order to the microprocessor unit of controlling overall operation, in order to the memory buffer of temporal data, in order to the flash memory interface module of access flash memory cell 210, in order to interface module and (not the illustrating) such as bug check and correction modules of the digital interface module access smartcard circuit 224 of microampere of communicating by letter with storage card reading device 110.
In this exemplary embodiment, it is will directly be sent to the general instruction of flash memory cells 210 and data or the smart card instruction and smart card security data that must be handled by smart card circuitry 224 that the microprocessor unit of memorizer control circuit 222 can be identified the instruction that receives via storage card reading device 110 and data, and carries out according to judged result and to write that data to flash memory cells 210 maybe will instruct and data are assigned to the running of smart card circuitry 224.In addition, as previously mentioned, make its memory capacity limited down in smart card circuitry 224 because of its standard, in this exemplary embodiment, but the smart card security data of intelligent cards chip 224 can be stored in memory capacity than in the big flash memory cells 210 of intelligent cards chip 224 itself under the management of memorizer control circuit 222.
Particularly, when if host computer system 100 is in normal manipulation mode, be to provide first power supply input P1 to smart card circuitry 224 by storage card reading device 110, first power supply input this moment P1 for example is 3.3 volts, the design of the power control unit 230 of this exemplary embodiment of arranging in pairs or groups, but smart card circuitry 224 operate as normal.Another kind of operator scheme is to read host computer system 100 with the wireless near field communication reading device.In this kind operator scheme, providing of P2 of second source input is near the wireless near field communication dispensing device time, and host computer system 100 detects the signal of wireless near field communication reading device and determines to receive second source input P2.Second source input this moment P2 for example is 1.8 volts, the design of the power control unit 230 of this exemplary embodiment of arranging in pairs or groups, but also operate as normal of smart card circuitry 224.In other words, in this exemplary embodiment, when storage card reading device 110 or 120 one of them power supply of wireless near field communication reading device, smart card circuitry 224 can both operate as normal.
Furthermore, Fig. 2 is the summary calcspar of the power control unit that one exemplary embodiment illustrates according to the present invention.Please refer to Fig. 2, the power control unit 230 of this exemplary embodiment comprises one first power supply service duct 232, a second source service duct 234, a voltage limiting unit 236 and a partial pressure unit 238.
The first power supply service duct 232 receives first power supply input P1, and determines whether providing first power supply input P1 to smart card circuitry 224 according to one first control signal Ctrl1.In this exemplary embodiment, the first control signal Ctrl1 changes its state in response to first power supply input P1, to control the first power supply service duct 232.At this, the first control signal Ctrl1 for example is by the reverse gained of first power supply input P1, but the present invention is not limited to this.In another exemplary embodiment, it can judge that first power supply input P1 provides one in order to first power supply is imported P1 to the first control signal Ctrl1 of smart card circuitry 224 when being higher than a predetermined voltage level by power control unit.On the other hand, second source service duct 234 receives second source input P2, and determines whether providing second source input P2 to smart card circuitry 224 according to one second control signal Ctrl2.In this exemplary embodiment, whether first power supply input P1 controls 234 conductings of second source service duct as the second control signal Ctrl2, but the present invention is not limited to this.In another exemplary embodiment, it can judge that second source input P2 provides one in order to second source being imported the second control signal Ctrl2 that P2 inputs to smart card circuitry 224 when being higher than a predetermined voltage level by power control unit, and the first control signal Ctrl1 that the first power supply service duct 232 is ended.
Voltage limiting unit 236 is coupled between the first power supply service duct 232 and the second source service duct 234, in order to suppressing a revers voltage that the first power supply service duct 232 feeds back to second source service duct 234 less than a particular value, and suppress second source service duct 234 and feed back to the revers voltage of the first power supply service duct 232 less than particular value.In the present embodiment, this particular value is not more than 60% or 1 volt that corresponding power supply is imported.For example, when the first power supply service duct 232 provided first power supply input P1, this particular value was not more than 60% of first power supply input P1, namely 0.6 times.Furthermore, when 110 power supplies of storage card reading device, 3.3 first power supply of volt input P1 exports smart card circuitry 224 to via the first power supply service duct 232, at the same time, the first power supply service duct 232 also can provide revers voltage to feed back to second source service duct 234, and then influences second source input P2.Therefore, in this exemplary embodiment, for example be the UICC codes and standards of smart card circuitry 224 in order to meet, the revers voltage that this exemplary embodiment collocation voltage limiting unit 236 can suppress the first power supply service duct, 232 feedbacks is about 0.3 volt, it is less than 0.5 volt, but the present invention is not limited to this, and the requirement for restriction of the feedback revers voltage between this power supply service duct can be ordered according to deviser's demand.In this example, actual providing to first power supply of smart card circuitry 224 input P1 is about 3.28 volts, so first power supply of this exemplary embodiment input P1 inputs to the voltage turn-on loss of data processing and control unit 220 less than 0.15 volt.
Otherwise, when wireless near field communication reading device 120 provides 1.8 volts second source input P2, second source service duct 234 also can provide revers voltage to feed back to the first power supply service duct 232, the voltage limiting unit 236 of this exemplary embodiment of arranging in pairs or groups also can suppress the revers voltage of second source service duct 234 feedbacks less than 0.5 volt.In other words, the design architecture of this exemplary embodiment is selected the purpose of a power supply except reaching dual power supply, and when the input of either party's power supply did not exist, the revers voltage that feeds back was about 0.3 volt, less than 0.5 volt, meets the codes and standards of UICC.In this example, actual providing to the second source of smart card circuitry 224 input P2 is about 1.78 volts, so the second source of this exemplary embodiment input P2 inputs to the voltage turn-on loss of data processing and control unit 220 also less than 0.15 volt.
238 pairs of first power supplys of partial pressure unit input P1 carries out dividing potential drop, and provides first power supply input P1 ' after the dividing potential drop to the output terminal OUT of power control unit 230 via its dividing potential drop node.In other words, first power supply input P1 is coupled to the output terminal OUT of power control unit 230 after the dividing potential drop, therefore, the output voltage of power control unit 230 can be imported the P1 interlock with first power supply, namely when first power supply input P1 is 3.3 volts, be output as 3.3 volts, otherwise then be 1.8 volts.The design of this exemplary embodiment by this kind interlock in the time of can avoiding switching to first power supply input P1 by second source input P2, causes the voltage of first power supply input P1 to drop to the faulty operation of 1.8 volts or 0 volt.In this exemplary embodiment, power control unit 230 comprises partial pressure unit 238, and in other exemplary embodiment, partial pressure unit 238 can optionally dispose according to the actual design demand, that is power control unit optionally comprises or do not comprise partial pressure unit.
Fig. 3 is the summary circuit diagram of the power control unit that one exemplary embodiment illustrates according to the present invention.Please refer to Fig. 3, the first power supply service duct 332 of this exemplary embodiment comprises one first on-off element Q1 and a signal receiving unit 333.In this exemplary embodiment, the first on-off element Q1 for example is with a transistor unit, and (P-MOSFET) realizes as the P-type mos field-effect transistor, but the present invention is not limited to this.The first on-off element Q1 has one first end, one second end and a control end, therefore source electrode, drain electrode and the grid of first end of the first on-off element Q1, second end and the corresponding P-type mos field-effect transistor of control end difference.First termination of the first on-off element Q1 is received first power supply input P1; Second end of the first on-off element Q1 is coupled to the output terminal OUT of power control unit; The control end of the first on-off element Q1 is coupled to signal receiving unit 333, to receive the first control signal Ctrl1.Signal receiving unit 333 has an input end and an output terminal.Input end receives first power supply input P1 and it is treated to the first control signal Ctrl1; Output terminal is coupled to the control end of the first on-off element Q1, and exports first control signal Ctrl1 to the first on-off element Q1, to control its conducting state.In this example, signal receiving unit 333 comprises a reverser, so signal receiving unit 333 is reverse with first power supply input P1, and as the first control signal Ctrl1.
Second source service duct 334 comprises a second switch element Q2.In this exemplary embodiment, second switch element Q2 realizes with a P-type mos field-effect transistor, but the present invention is not limited to this.Second switch element Q2 has one first end, one second end and a control end, so source electrode, drain electrode and the grid of first end of second switch element Q2, second end and the corresponding P-type mos field-effect transistor of control end difference.First termination of second switch element Q2 is received second source input P2; Second end of second switch element Q2 is coupled to the output terminal OUT of power control unit; Control end receives first power supply input P1 as the second control signal Ctrl2.
In this exemplary embodiment, the first on-off element Q1 and second switch element Q2 realize with the P-type mos field-effect transistor, this kind design architecture, its voltage turn-on loss is about 0.02 volt, P1 is 3.3 volts in the input of first power supply, second source input P2 is in 1.8 volts the embodiment, the magnitude of voltage that can guarantee first power supply input P1 that the first power supply service duct 332 is exported is about 3.28 volts, the magnitude of voltage of guaranteeing the second source input P2 that second source service duct 334 is exported simultaneously is about 1.78 volts, meets the codes and standards of UICC.Magnitudes of voltage such as above-mentioned 0.02 volt, 3.3 volts, 3.28 volts, 1.8 volts and 1.78 volts are only in order to illustrate, and the present invention is not limited to this.
In this exemplary embodiment, partial pressure unit 338 has one first end, one second end and a dividing potential drop node N.First end is coupled to first power supply input P1; Second end is coupled to ground.338 pairs of first power supplys of partial pressure unit input P1 carries out dividing potential drop, and provides first power supply input P1 after the dividing potential drop to the output terminal OUT of power control unit via dividing potential drop node N.The partial pressure unit 338 of this exemplary embodiment is to be implemented by first resistance R 1 of coupled in series and second resistance R 2.One end of first resistance R 1 is as first end of partial pressure unit 338, and is coupled to first power supply input P1.The other end of first resistance R 1 is as dividing potential drop node N1, to provide first power supply input P1 ' after the dividing potential drop to the output terminal OUT of power control unit 330.One end of second resistance R 2 is coupled to the other end of first resistance R 1, and the other end of second resistance is as second end of partial pressure unit 338 and be coupled to ground.Partial pressure unit 338 will provide first power supply after the dividing potential drop to import P1 ' to the output terminal OUT of power control unit 330, this exemplary embodiment is by the design of this kind interlock, in the time of can avoiding switching to first power supply input P1 by second source input P2, cause the voltage of first power supply input P1 to drop to the faulty operation of 1.8 volts or 0 volt.
Fig. 4 is the flow chart of steps of power control method of the storage card of one embodiment of the invention.Please be simultaneously with reference to Fig. 1, Fig. 2 and Fig. 4, the power control method of present embodiment is applicable to the illustrated storage card of Fig. 1 to Fig. 3 at least, it comprises the steps.In step S400, receive first power supply input P1 at least.In this exemplary embodiment, host computer system 100 for example is to be in normal manipulation mode, provides first power supply input P1 to power control unit 230 by storage card reading device 110, and first power supply input this moment P1 for example is 3.3 volts.In other exemplary embodiment, step S400 can comprise that also receiving second source imports P2.Then, in step S402, P1 carries out dividing potential drop to the input of first power supply, and provides first power supply after the dividing potential drop to import P1 ' to output terminal OUT and the first power supply service duct 232 of power control unit 230.Afterwards, in step S404, oppositely first power supply input P1 ' after the dividing potential drop is as the first control signal Ctrl1, to control the supply of first power supply input P1.In this step, if power control unit 230 does not optionally dispose partial pressure unit 238, then be not reversed the person and be first power supply input P1.Continue it, in step S406, according to the first control signal Ctrl1, select to provide first power supply input P1 to the data processing and control unit smart card circuitry 224 in 220.Then, in step S408, suppress first power supply input P1 and feed back to the revers voltage of second source input P2 less than particular value.In step S400, if the recipient of institute comprises second source input P2, then step S408 comprises that also suppressing second source input P2 feeds back to the revers voltage of first power supply input P1 less than this particular value.
Fig. 5 is the flow chart of steps of power control method of the storage card of another embodiment of the present invention.Please be simultaneously with reference to Fig. 1, Fig. 2 and Fig. 5, the power control method of present embodiment is applicable to the illustrated storage card of Fig. 1 to Fig. 3 at least, it comprises the steps.In step S500, receive second source input P2.In this exemplary embodiment, providing of P2 of second source input is near the wireless near field communication dispensing device time, and host computer system 100 detects the signal of wireless near field communication reading device and determines to receive second source input P2.At this moment, provide second source input P2 to power control unit 230 by wireless near field communication reading device 120, storage card reading device 110 is not powered, and the P1 of first power supply input in other words system is in low level state.Then, in step S502, according to the second control signal Ctrl2, select to provide second source input P2 to the data processing and control unit smart card circuitry 224 in 220.In this step, first power supply input P1 comes conducting second source service duct 234 as the second control signal Ctrl2.Afterwards, in step S504, suppress second source input P2 and feed back to the revers voltage of first power supply input P1 less than particular value.
In addition, the power control method of embodiments of the invention can be obtained enough teachings, suggestion and implementation in the narration by Fig. 1 to Fig. 3 embodiment, therefore repeats no more.
In sum, in exemplary embodiment of the present invention, storage card has intelligent card function, can carry out wireless near field communication.And the power control method that provides can make this storage card appoint under the situation of selecting the one power supply at dual power supply, and its inner smart card circuitry all can operate as normal.In addition, utilize the design architecture of voltage limiting unit, the revers voltage that can suppress to feed back when not existing when either party's power supply input less than particular value to meet design specifications.Simultaneously, by the design of power supply input with the output terminal interlock of power control unit, the faulty operation that the voltage that causes in the time of can avoiding the power supply input to switch descends.
Though the present invention with embodiment openly as above; so it is not in order to limit the present invention; those skilled in the art when doing a little change and retouching, are as the criterion so protection scope of the present invention ought be looked the appended claims person of defining without departing from the spirit and scope of the present invention.
Claims (22)
1. the storage card of a tool intelligent card function comprises:
One flash memory cells;
One data processing and control unit is coupled to this flash memory cells, controls this flash memory cells, and encryption and decryption and storage one smart card security data; And
One power control unit is coupled to this data processing and control unit and this flash memory cells, receive one first power supply input and a second source import both at least one of them,
Wherein this power control unit selects to provide this first power supply input or this second source to input to this data processing and control unit according at least one control signal, and an output terminal of this power control unit is coupled to this first power supply input.
2. storage card as claimed in claim 1, wherein this power control unit comprises:
One first power supply service duct in order to receiving the input of this first power supply, and determines whether providing this first power supply to input to this data processing and control unit according to one first control signal; And
One second source service duct in order to receiving the input of this second source, and determines whether providing this second source to input to this data processing and control unit according to one second control signal,
Wherein this first control signal changes its state in response to this first power supply input, to control this first power supply service duct.
3. storage card as claimed in claim 2, wherein this first power supply service duct comprises:
One first on-off element has one first end, one second end and a control end, and this first termination is received this first power supply input, and this second end is coupled to this output terminal of this power control unit; And
One signal receiving unit has an input end and an output terminal, and this input end receives this first power supply input, and it is treated to this first control signal, and this output terminal is coupled to this control end of this first on-off element, and exports this first control signal.
4. storage card as claimed in claim 3, wherein this signal receiving unit comprises:
One reverser has this input end and this output terminal, and this input end receives this first power supply input, and it is reversed this first control signal, and this output terminal is coupled to this control end of this first on-off element, and exports this first control signal.
5. storage card as claimed in claim 2, wherein this second source service duct comprises:
One second switch element, have one first end, one second end and a control end, this first termination is received this second source input, and this second end is coupled to this output terminal of this power control unit, and this control end of this second switch element is in order to receive this second control signal.
6. storage card as claimed in claim 2, wherein this power control unit also comprises:
One voltage limiting unit, be coupled in this first and this second source service duct between, in order to suppress a revers voltage that this first power supply service duct feeds back to this second source service duct less than a particular value, perhaps suppress this second source service duct and feed back to this revers voltage of this first power supply service duct less than this particular value.
7. storage card as claimed in claim 6, wherein this voltage limiting unit comprises:
One first diode has an anode and a negative electrode, and this anode is coupled to this first power supply input, and this negative electrode is coupled to this first on-off element; And
One second diode has an anode and a negative electrode, and this anode is coupled to this second source input, and this negative electrode is coupled to this second switch element.
8. storage card as claimed in claim 1, wherein this power control unit comprises:
One partial pressure unit, have one first end, one second end and a dividing potential drop node, this first end is coupled to this first power supply input, this second end is coupled to ground, this partial pressure unit to this first power supply input carry out dividing potential drop, and provide this first power supply after the dividing potential drop to input to this output terminal of this power control unit via this dividing potential drop node.
9. storage card as claimed in claim 8, wherein this partial pressure unit comprises:
One first resistance, one end is as this first end of this partial pressure unit, and is coupled to this first power supply input, and the other end of this first resistance is as this dividing potential drop node, and provides this first power supply after the dividing potential drop to input to this output terminal of this power control unit; And
One second resistance, with this first resistance coupled in series, an end of this second resistance is coupled to this other end of this first resistance, and the other end of this second resistance is as this second end of this partial pressure unit and be coupled to ground.
10. storage card as claimed in claim 1, wherein this data processing and control unit comprises:
One memorizer control circuit couples this flash memory cells, and controls this flash memory cells; And
One smart card circuitry is coupled to this memorizer control circuit, and encryption and decryption and these smart card security data of storage,
Wherein this smart card circuitry receives these smart card security data or sends handled these smart card security data to this host computer system by this memorizer control circuit from a host computer system; And this power control unit selects to provide this first power supply input or this second source to input to this smart card circuitry.
11. storage card as claimed in claim 1, wherein this flash memory cells is also stored this smart card security data.
12. storage card as claimed in claim 1, wherein this first power supply input is provided by this storage card reading device, and this second source input is provided by a wireless near field communication reading device.
13. the power control method of a storage card, this storage card comprise a power control unit and a data processing and control unit, this power control method comprises:
Receive one first power supply input and a second source import both at least one of them; And
According at least one control signal, select to provide this first power supply input or this second source to input to a smart card circuitry this data processing and control unit in, wherein an output terminal of this power control unit is coupled to the input of this first power supply.
14. power control method as claimed in claim 13, the step of wherein selecting to provide this first power supply input or this second source to input to this smart card circuitry comprises:
Determine whether providing this first power supply to input to this data processing and control unit according to one first control signal, wherein this first control signal changes its state in response to this first power supply input, to control the supply of this first power supply input.
15. power control method as claimed in claim 14, the step of wherein selecting to provide this first power supply input or this second source to input to this smart card circuitry also comprises:
Oppositely this first power supply input is as this first control signal, to control the supply of this first power supply input.
16. power control method as claimed in claim 14, the step of wherein selecting to provide this first power supply input or this second source to input to this smart card circuitry also comprises:
Determine whether providing this second source to input to this data processing and control unit according to one second control signal, wherein this first power supply input is as this second control signal.
17. power control method as claimed in claim 13 also comprises:
Suppress this first power supply input and feed back to a revers voltage of this second source input less than a particular value; And
18. power control method as claimed in claim 17 also comprises:
Suppress this second source input and feed back to this revers voltage of this first power supply input less than this particular value.
19. power control method as claimed in claim 13 also comprises:
Dividing potential drop is carried out in input to this first power supply, and provides this first power supply after the dividing potential drop to input to this output terminal of this power control unit.
20. a power control circuit comprises:
One first power supply service duct in order to receiving one first power supply input, and determines whether providing this first power supply to input to a data processing and control unit according to one first control signal;
One second source service duct in order to receiving second source input, and determines whether providing this second source to input to this data processing and control unit according to one second control signal; And
One voltage limiting unit, be coupled in this first and this second source service duct between, in order to suppress a revers voltage that this first power supply service duct feeds back to this second source service duct less than a particular value, perhaps suppress this second source service duct and feed back to this revers voltage of this first power supply service duct less than this particular value.
21. power control circuit as claimed in claim 20, wherein this first power supply input or this second source input to the voltage turn-on loss of this data processing and control unit less than 0.15 volt.
22. power control circuit as claimed in claim 20, wherein this particular value is not more than 60% or 1 volt that this corresponding power supply is imported.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210077599.XA CN103325409B (en) | 2012-03-22 | 2012-03-22 | The storage card of tool intelligent card function and power control method thereof and power control circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210077599.XA CN103325409B (en) | 2012-03-22 | 2012-03-22 | The storage card of tool intelligent card function and power control method thereof and power control circuit |
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| CN103325409B CN103325409B (en) | 2016-03-23 |
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| US20020075048A1 (en) * | 1999-07-02 | 2002-06-20 | Yoshikazu Miyamoto | Timing signal generating circuit |
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| CN103325409B (en) | 2016-03-23 |
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