CN104598962A - Active passive type double-frequency chip and RFID system - Google Patents
Active passive type double-frequency chip and RFID system Download PDFInfo
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Abstract
The invention discloses an active passive type double-frequency chip and an RFID system. The active passive type double-frequency chip comprises a passive awakening module and an active module, wherein the passive awakening module is used for receiving 125 K low-frequency activation signals, the active module is used for transmitting 2.4 G radio frequency signals, the passive awakening module comprises a first radio frequency antenna, a rectifying circuit, a demodulation circuit, a logic circuit and a power supply switch which are sequentially and electrically connected, the input end of the power supply switch receives awakening signals transmitted by the logic circuit and receives awakening feedback signals of the active module, the output end of the power supply switch is electrically connected with the awakening enabling end of a microprocessor circuit, and the output end of the microprocessor circuit is electrically connected with a second radio frequency antenna used for transmitting 2.4 G radio frequency signals. The active module is in the electricity-saving mode when the active passive type double-frequency chip is in the normal state, and therefore electricity is saved; when the 125 K low-frequency activation signals are received, the passive awakening module can awaken the active module, and the active module can transmit the 2.4 G radio frequency signals; thus, the active passive type double-frequency chip has the advantages of being large in data storage capacity, long in reading-writing distance and long in service life at the same time.
Description
Technical field
The present invention relates to dual band radio frequency technical field, particularly relate to a kind of active passive type dual-band chip and rfid system.
Background technology
No matter RFID (Radio Frequency IDentification) label is in the market active label or passive label, is mostly one working frequency.Passive label mainly contains the product of 125KHz, 13.56MHz, 915MHz, three frequency ranges, and the principal feature life-span is long, and wherein 125KHz, 13.56MHz product memory capacity is little, and reading/writing distance is short, can not adapt to read and write requirement at a distance; Although 915MHz product is greatly improved on reading/writing distance, memory capacity is also very limited, can not meet massive store demand.Active label mainly contains 2.4GHzHz product, and memory capacity is large, reading/writing distance is far away but mainly initiatively send data at present due to this series products, and power consumption is large, and the life-span is subject to certain restrictions, and is generally 3 ~ 5 years, can not meet long-life request for utilization.Recent market also there are some double frequency RFID label tag, but performance, all also there is many deficiencies, such as memory capacity is large not, and maximum 16KB, life-span are long not enough, maximum 6 years, and the present invention is integrated with 125KHz and 2.4GHzHz in a chip simultaneously, 125k signal plays activation, and only when being activated, 2.4GHz signal just can work, greatly reduce power consumption, extend serviceable life.
Summary of the invention
The first object of the present invention is to provide a kind of active passive type dual-band chip, this active passive type dual-band chip data storage capacity is large, and reading/writing distance is far away, long working life, solve the difficult problem that the active label mission life of current single-frequency is short, and the shortcoming that passive label reading/writing distance is near.
For solving the problems of the technologies described above, technical scheme of the present invention is: a kind of active passive type dual-band chip comprises the passive wake module for receiving 125K low frequency activation signal, described passive wake module comprises the first radio-frequency antenna, described first radio-frequency antenna is electrically connected with rectification circuit, described rectification circuit is electrically connected with the input end of the demodulator circuit for cracking 125K low frequency activation signal, the output terminal of described demodulator circuit is electrically connected with the input end of the logical circuit for verifying described 125K low frequency activation signal, and described logical circuit selects logical circuit low in energy consumption; Also comprise power switch, described power switch comprises first input end and the second input end, and described first input end is electrically connected with the output terminal of described logical circuit, and described power switch is electrically connected with battery; For launching the active module embedded therein of 2.4GHz radiofrequency signal, described active module embedded therein comprises microcontroller circuit, described microcontroller circuit comprises and wakes Enable Pin up, wakes enable feedback end and output terminal up, described waking up makes feedback end be electrically connected with the second input end of described power switch, described in wake Enable Pin up and be electrically connected with the output terminal of described power switch; The output terminal of described microcontroller circuit is electrically connected with the second radio-frequency antenna for launching 2.4GHz radiofrequency signal.
Optimal way is, described passive wake module also comprises the amplitude limiter circuit and clock recovery circuitry that are all electrically connected with described rectification circuit, described clock recovery circuitry is also electrically connected with described demodulator circuit, described amplitude limiter circuit is electrically connected with a reference circuit, described reference circuit is also electrically connected with power-on and power-off reset circuit and mu balanced circuit respectively, and described mu balanced circuit is also electrically connected with described logical circuit.
Optimal way is, described rectification circuit comprises two PMOS and two NMOS tube.
Optimal way is, the voltage stabilized range of described mu balanced circuit is 1.9 ~ 3.6V.
Optimal way is, described microcontroller circuit comprises microprocessor, and the external memory storage be electrically connected with described microprocessor and microprocessor peripheral circuit, and described microcontroller carries out communication with described external memory storage by SPI mode and is connected.
Optimal way is, described microcontroller circuit also comprises amplifying circuit, and the input end of described amplifying circuit is electrically connected with described microprocessor, and the output terminal of described amplifying circuit is as the output terminal of described microcontroller circuit.
Optimal way is, described power switch comprises logic sum gate, two input ends of described logic sum gate are respectively as the first input end of described power switch and the second input end, the output terminal of described logic sum gate is electrically connected with the grid of a MOS switching tube, the drain electrode of described MOS switching tube connects battery, described battery is electrically connected through the grid of resistance with described MOS switching tube, and the source electrode of described MOS switching tube is as the output terminal of described power switch.
Optimal way is, described microcontroller circuit comprises the nRF24LE chip with 2.4GHz wireless transceiver, and the port P0.0 of described nRF24LE chip wakes enable feedback end up as described.
Optimal way is, LF2PAS3933 chip selected by described external memory storage.
The second object of the present invention is to provide a kind of active passive type Double-Frequency System, and this active passive type Double-Frequency System reading/writing distance is far away, and long working life, makes its applied range.
For solving the problems of the technologies described above, technical scheme of the present invention is: a kind of active passive type Double-Frequency System, comprises 125K low frequency activation device, above-mentioned active passive type dual-band chip, and 2.4GHz gateway.
After adopting technique scheme, the invention has the beneficial effects as follows: because active passive type dual-band chip of the present invention comprises the passive wake module for receiving 125K low frequency activation signal, passive wake module comprises the first radio-frequency antenna, first radio-frequency antenna is electrically connected with rectification circuit, rectification circuit is electrically connected with the input end of the demodulator circuit for cracking 125K low frequency activation signal, the output terminal of demodulator circuit is electrically connected with the input end of the logical circuit for verifying 125K low frequency activation signal, and logical circuit selects logical circuit low in energy consumption.Above-mentioned passive wake module enables the present invention receive 125K low frequency activation signal, and 125K low frequency activation signal is cracked and verified, and judges whether to export wake-up signal according to the result of verification.
The present invention also comprises the active module embedded therein for launching 2.4G radiofrequency signal, active module embedded therein comprises microcontroller circuit, microcontroller circuit comprises and wakes Enable Pin up, wakes enable feedback end and output terminal up, wherein wake up and feedback end is electrically connected with the second input end of power switch, wake Enable Pin up and be electrically connected with the output terminal of power switch; The output terminal of microcontroller circuit is electrically connected with the second radio-frequency antenna for launching 2.4G radiofrequency signal.Above-mentioned active module embedded therein is in battery saving mode under normal circumstances, and waking up after Enable Pin receives wake-up signal, microcontroller circuit is revived and started work from battery saving mode, exports 2.4G radiofrequency signal and is also launched by the second radio-frequency antenna.
The present invention is also provided with power switch between passive wake module and active module embedded therein, this power switch receives the wake-up signal from passive wake module, according to the wake-up signal wakes active module embedded therein received, active module embedded therein transmission simultaneously wakes up and feeds back signal to power switch, ensures reliability of the present invention.
From the above, active passive type dual-band chip of the present invention has the function of 125K chip and 2.4G chip simultaneously, and when being applied in double-frequency electronic label, by particular communication agreement, the present invention can read 125K low frequency signal, sends 2.4G radiofrequency signal.Therefore present invention incorporates the feature of low frequency high precision and high frequency large coverage, also there is data storage capacity large, the advantage of the far away and long working life of reading/writing distance, solves the difficult problem that the active label mission life of current single-frequency is short, and the shortcoming that passive label reading/writing distance is near.Apply the active passive type rfid system of dual-band chip of the present invention, because using the bright dual-band chip of this law, making rfid system also have the advantage of the far away and long working life of reading/writing distance, and making its range of application very wide.Can be applicable to high-precision asset management (as gun off-location system, critical asset material management) and accurate garden personnel positioning management (as kindergarten, campus, home for destitute, Prison staff location) be applicable to fixed capital management, logistics, national defense safety, the fields such as personnel positioning management.
Because active module embedded therein also comprises amplifying circuit, the input end of amplifying circuit is electrically connected with microprocessor, the output terminal of amplifying circuit is as the output terminal of microcontroller circuit, the 2.4G radiofrequency signal that microcontroller circuit exports by this amplifying circuit is amplified, and makes 2.4G radiofrequency signal be reinforced the transmitting being beneficial to the second radio-frequency antenna.
Accompanying drawing explanation
Fig. 1 is the chip pin schematic diagram of active passive type dual-band chip of the present invention;
Fig. 2 is the memory control module block diagram of active passive type dual-band chip of the present invention;
Fig. 3 is the theory diagram of active passive type dual-band chip of the present invention;
Fig. 4 is the demodulator circuit of active passive type dual-band chip of the present invention;
Fig. 5 is the microcontroller block diagram of active passive type dual-band chip of the present invention;
Fig. 6 is the on-off circuit figure of active passive type dual-band chip of the present invention;
In figure: 1-CE, 2-XI, 3-XO, 4-RFP, 5-RFN, 6-GND, 7-VCC, 8-SCK, 9-MOSI, 10-MISO, 11-LRF, 12-IREE.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
As depicted in figs. 1 and 2, a kind of active passive type dual-band chip comprises passive wake module and active module embedded therein, wherein passive wake module can receive 125K low frequency activation signal by particular communication agreement, after this low frequency activation signal is received by the first radio-frequency antenna of passive wake module, the first radio-frequency antenna by 125K low frequency activation Signal transmissions to rectification circuit.Rectification circuit is transferred to demodulator circuit by after the signal shaping of 125K low frequency activation, the signal received cracks by demodulator circuit, when signal reaches threshold requirement, demodulator circuit exports the electric signal of corresponding 125K low frequency activation signal to the low energy logic be connected electrically, this low energy logic, after verification, judges whether to export wake-up signal (pulse) to power switch according to check results.After power switch receives wake-up signal, assign to the microcontroller circuit of active module embedded therein and wake electric signal up, microcontroller circuit receives and wakes electric signal up, wake enable feedback end after being waken up up and transmit feedback electric signal again to the input end of power switch, after power switch receives feedback signal, active module embedded therein and battery link together by output terminal reliably.After the microcontroller circuit of active module embedded therein receives wake-up signal, work of reviving from battery saving mode, and transmit 2.4G radiofrequency signal to the second radio-frequency antenna, allow dual-band chip of the present invention launch high frequency radio signals and go response.
Comprise 12 pins after dual-band chip of the present invention encapsulation, be specially that pin one is CE, pin two is XI, pin 3 is XO, pin 4 is RFP, pin 5 is RFN, pin 6 is GND, pin 7 is VCC, pin 8 is SCK, pin 9 is MOSI, pin one 0 is MISO, pin one 1 for LRF and pin one 2 be IREE.
The rectification circuit of the present embodiment comprises two PMOS and two NMOS tube, and wherein two NMOS tube are defined as n1 and n2 respectively, and two PMOS are defined as p1 and p2 respectively.N1, p1, n2, p2 cross connection, the wherein source ground of n1 and n2, two grids connect the first radio-frequency antenna, and these the first radio-frequency antenna two ends also connect an electric capacity, form capacitor and inductor resonant tank.The drain electrode of n1 connects the grid of p1 source electrode and p2, and the drain electrode of n2 connects the source electrode of p2 and the grid of p1.The drain electrode of P1 and the drain electrode of p2 export Vc.This Vc is that whole passive wake module is powered, thus saves electricity and ensure that serviceable life.
The demodulator circuit of the present embodiment as shown in Figure 4, in demodulator circuit, input signal is through P21 low-pass filtering, its signal exported in the hysteresis comparator circuit formed at P22, P23, P24, P25, P26, N21, N22, N23 and N24 compares, and realizes envelope detection and exports.R1 and R2 realizes sampling to the output of rectification circuit, and demodulation exports as demod_out.
The passive wake module of the present embodiment also comprises the amplitude limiter circuit and clock recovery circuitry that are all electrically connected with rectification circuit, wherein clock recovery circuitry is also electrically connected with demodulator circuit, amplitude limiter circuit is electrically connected with a reference circuit, reference circuit is also electrically connected with power-on and power-off reset circuit and mu balanced circuit respectively, mu balanced circuit is also electrically connected with logical circuit, and the voltage stabilized range of this mu balanced circuit is 1.9 ~ 3.6V.Because amplitude limiter circuit, clock recovery circuitry and mu balanced circuit are prior art, be not described in detail at this.
As shown in Figure 6, the power switch of the present embodiment comprises logic sum gate, two input ends of logic sum gate, one is electrically connected with the output terminal of logical circuit, another is electrically connected with the P0.0 port of microprocessor, and the output terminal of logic sum gate is electrically connected with the grid of a MOS switching tube, and the drain electrode of MOS switching tube connects battery, battery is electrically connected through the grid of resistance with MOS switching tube, and the source electrode of MOS switching tube is electrically connected with the Enable Pin WAKE that wakes up of microprocessor.
As shown in Figure 2, microcontroller circuit comprises microprocessor, and the external memory storage to be electrically connected with microprocessor and microprocessor peripheral circuit, wherein microprocessor peripheral circuit is correlated with according to the microprocessor selected, after have selected microprocessor, microprocessor peripheral circuit also discloses, and is not described in detail at this.Its external memory carries out communication by SPI (Serial Peripheral interface) mode with microprocessor and is connected.Microcontroller circuit also comprises amplifying circuit in addition, and the input end of this amplifying circuit is electrically connected with microprocessor, and the output terminal of amplifying circuit is electrically connected with the second radio-frequency antenna.
As shown in Figure 2 and Figure 5, nRF24LE chip selected by the microcontroller of the present embodiment, nRF24LE chip has 2.4G wireless transceiver, and itself there is the SRAM (Static RAM) of 4K and the ROM of 512 bytes, there is an independent SPI, containing three Serial Port Lines, related register is configured, nRF24LE chip can be set to battery saving mode by programmed control simultaneously, and when battery saving mode, nRF24LE chip quits work.
Microcontroller is connected by P0.2 and P0.0 with power switch simultaneously, WAKE wake-up signal is sent to power switching module by P0.2, wake enable port P0.0 connection power supply up by microcontroller and accept feedback signal WAKE_UP signal, microcontroller is waken up from battery saving mode, carries out work.Microprocessor connects amplifying circuit by ANT1, ANT2, VDD_PA pin, and amplifying circuit is electrically connected with the second radio-frequency antenna again.
The nRF24LE chip internal of the present embodiment, with the RAM of ROM and the 4K byte of 512 bytes, stores the boot of producer's solidification in ROM, power on the automatic RAM from loading procedure in the middle of external memory storage to 4Kbyte initially.RAM, except for storing except master routine that external load comes in, is also the memory block of inter-process data.After power-off, content in RAM will be lost, and therefore in order to avoid using the programming all will carrying out program to it at every turn, has carried out the expansion of external memory storage to nRF24LE chip, data processing master routine is stored, i.e. the LF2PAS3933 chip of the present embodiment by external memory storage.
The P1.4 port of nRF24LE chip, P1.5 port, P1.6 port is as SPI data communication interface, be configured with LF2PAS3933 chip, the wake-up signal of the P0.0 port accepts power switch of nRF24LE chip, p0.3 port receives CL-DAT (clock data) output signal of LF2PAS3933 chip, according to the rule of clock signal, receive LF2PAS3933 chip DAT with p1.4 port and hold the data message exported, be combined into corresponding data frame format, held by the ANT1 of nRF24LE chip end and ANT2 and be modulated into 2.4G radio signal transmission to amplifying circuit.
In sum, the function of the 125K chip that active passive type dual-band chip of the present invention has simultaneously and 2.4G chip, is mainly used in double-frequency electronic label.During application, passive wake module of the present invention reads 125K low frequency activation signal, and by particular communication agreement, active module embedded therein sends 2.4G high frequency radio signals.Dual-band chip of the present invention combines the feature of low frequency high precision and high frequency large coverage, accomplish high-precision asset management, such as gun off-location system, critical asset material management, also accomplish the personnel positioning management of accurate garden, such as: as kindergarten, campus, home for destitute, Prison staff location; Be applicable to fixed capital management, logistics, national defense safety, the fields such as personnel positioning management.
When active passive type dual-band chip of the present invention is applied to rfid system, rfid system forms primarily of 125K low frequency activation device, 125K+2.4G dual-frequency label and 2.4G gateway.125K low frequency activation device: have multiple radio-frequency transmissions antenna with unique ID in a set of equipment; 125K+2.4G dual-frequency label: be made up of dual-band chip, after chip in label receives 125K activation signal, activate 2.4G signal, the unique encodings information of the id information activated and 2.4G and corresponding RSSI (Received Signal Strength Indication) value are sent by 2.4G radio frequency; 2.4G gateway: receive 2.4G radiofrequency signal, and reach server by RJ45 netting twine.
The concrete principle of dual-band chip of the present invention is: adopt digital modulation and demodulation techniques, work under being supported in 125K and 2.4G simultaneously.Message transmission rate can regulate, and support 1Mbps, 1.5Mbps two kinds of message transmission rates, high data rate can complete same data transmit-receive in the shorter time, therefore can have lower power consumption.
Dual-band chip of the present invention has carried out special optimization for low-power consumption application scenario, and in the shutdown mode, all register values and FIFO (First Input First Output) value remain unchanged, and cut-off current is 0.7uA; In stand-by mode, clock maintenance work, electric current is 15uA, and can start the transmitting-receiving of data within the longest 130uS time.
Dual-band chip mode of operation of the present invention is very convenient, only needs microcontroller namely can be realized the transceive communications of data to a few register configuration of chip by SPI interface.
Dual-band chip of the present invention has low-down system application cost, only needs a microcontroller and a small amount of peripheral passive device namely can form a wireless data transceiving system.The LDO power supply of inner integrated high PSRR (PowerSupply Rejection Ratio), ensures steady operation within the scope of 1.9-3.6V wide power; The multiple standards I/O voltages such as the compatible 2.5V/3.3V/5V of numeral I/O, directly can be connected with various microcontroller ports.
The above preferred embodiment of the present invention; not in order to limit the present invention; all any amendments done within the spirit and principles in the present invention, etc. the improvement etc. of same active passive type dual-band chip structure, all should be included within protection scope of the present invention.
Claims (10)
1. an active passive type dual-band chip, is characterized in that, comprise
For receiving the passive wake module of 125K low frequency activation signal, described passive wake module comprises the first radio-frequency antenna, described first radio-frequency antenna is electrically connected with rectification circuit, described rectification circuit is electrically connected with the input end of the demodulator circuit for cracking 125K low frequency activation signal, the output terminal of described demodulator circuit is electrically connected with the input end of the logical circuit for verifying described 125K low frequency activation signal, and described logical circuit selects logical circuit low in energy consumption; Also comprise power switch, described power switch comprises first input end and the second input end, and described first input end is electrically connected with the output terminal of described logical circuit, and described power switch is electrically connected with battery;
For launching the active module embedded therein of 2.4G radiofrequency signal, described active module embedded therein comprises microcontroller circuit, described microcontroller circuit comprises and wakes Enable Pin up, wakes enable feedback end and output terminal up, described waking up makes feedback end be electrically connected with the second input end of described power switch, described in wake Enable Pin up and be electrically connected with the output terminal of described power switch; The output terminal of described microcontroller circuit is electrically connected with the second radio-frequency antenna for launching 2.4GHz radiofrequency signal.
2. active passive type dual-band chip according to claim 1, it is characterized in that, described passive wake module also comprises the amplitude limiter circuit and clock recovery circuitry that are all electrically connected with described rectification circuit, described clock recovery circuitry is also electrically connected with described demodulator circuit, described amplitude limiter circuit is electrically connected with a reference circuit, described reference circuit is also electrically connected with power-on and power-off reset circuit and mu balanced circuit respectively, and described mu balanced circuit is also electrically connected with described logical circuit.
3. active passive type dual-band chip according to claim 2, is characterized in that, described rectification circuit comprises two PMOS and two NMOS tube.
4. active passive type dual-band chip according to claim 3, is characterized in that, the voltage stabilized range of described mu balanced circuit is 1.9 ~ 3.6V.
5. active passive type dual-band chip according to claim 1, it is characterized in that, described microcontroller circuit comprises microprocessor, and the external memory storage to be electrically connected with described microprocessor and microprocessor peripheral circuit, described microcontroller carries out communication with described external memory storage by SPI mode and is connected.
6. active passive type dual-band chip according to claim 5, it is characterized in that, described microcontroller circuit also comprises amplifying circuit, and the input end of described amplifying circuit is electrically connected with described microprocessor, and the output terminal of described amplifying circuit is as the output terminal of described microcontroller circuit.
7. the active passive type dual-band chip according to any one of claim 1 to 6, it is characterized in that, described power switch comprises logic sum gate, two input ends of described logic sum gate are respectively as the first input end of described power switch and the second input end, the output terminal of described logic sum gate is electrically connected with the grid of a MOS switching tube, the drain electrode of described MOS switching tube connects battery, described battery is electrically connected through the grid of resistance with described MOS switching tube, and the source electrode of described MOS switching tube is as the output terminal of described power switch.
8. active passive type dual-band chip according to claim 7, is characterized in that, the nRF24LE chip with 2.4GHz wireless transceiver selected by described microprocessor, and the port P0.0 of described nRF24LE chip wakes enable feedback end up as described.
9. active passive type dual-band chip according to claim 8, it is characterized in that, LF2PAS3933 chip selected by described external memory storage.
10. an active passive type Double-Frequency System, is characterized in that, comprises the active passive type dual-band chip described in 125K low frequency activation device, any one of claim 1 to 9, and 2.4GHz gateway.
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| CN107577189B (en) * | 2017-10-20 | 2023-12-19 | 中国电建集团成都勘测设计研究院有限公司 | Accurate timing wake-up method of automatic monitoring system |
| CN108199732A (en) * | 2018-02-08 | 2018-06-22 | 北京智芯微电子科技有限公司 | Radio frequency transmission chip |
| CN108199732B (en) * | 2018-02-08 | 2024-01-23 | 北京智芯微电子科技有限公司 | Radio frequency transmission chip |
| CN108828572A (en) * | 2018-08-24 | 2018-11-16 | 杭州物必连科技有限公司 | A kind of Internet of Things Web robot, articles from the storeroom positioning system and localization method |
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