CN106292370B - A wireless sensor node - Google Patents

Abstract

The present application provides a wireless sensor node, the energy collection antenna collects the second radio frequency energy, the radio frequency energy collection circuit converts the second radio frequency energy into electric energy and stores it in the off-chip printed capacitor, and the off-chip printed A type capacitor is connected to the radio frequency and the analog front-end circuit, and transmits the electric energy to the radio frequency and the analog front-end circuit, and the radio frequency and the analog front-end circuit can be the temperature sensor, the humidity sensor interface circuit, the electric The erasable programmable read-only memory, the radio frequency and analog front-end circuit, the processing circuit and the radio frequency energy harvesting circuit are powered, the temperature sensor and the humidity sensor can collect data, and it is no longer the communication antenna that receives the first The sensor information can only be collected after the radio frequency energy is activated, which solves the problem that the sensor information cannot be collected actively.

Description

A wireless sensor node

technical field

The invention relates to the field of sensor control, more specifically, to a wireless sensor node.

Background technique

Passive UHF radio frequency identification technology has the advantages of low cost, long recognition distance and fast recognition speed. In recent years, it has been widely used in clothing, asset management, logistics, temperature, humidity measurement and other fields. In this case, the passive UHF identification tag chip and the sensor are combined, and the sensor and the passive UHF identification tag circuit are integrated on one chip. During the working process, the antenna needs to receive the RF energy of the reader before it can collect sensor information and transmit RF signals, and cannot actively collect sensor information. Therefore, there is an urgent need for a device that can actively collect sensor information.

Contents of the invention

In view of this, the present invention provides a wireless sensor node to solve the problem that sensor information cannot be actively collected.

In order to solve the problems of the technologies described above, the present invention adopts the following technical solutions:

A wireless sensor node, the wireless sensor node comprising:

Communication antenna, energy harvesting antenna, radio frequency and analog front-end circuit, processing circuit, electrically erasable programmable read-only memory, temperature sensor, humidity sensor, humidity sensor interface circuit, off-chip printed capacitor and radio frequency energy harvesting circuit; the radio frequency The analog front-end circuit, the processing circuit, the EEPROM, the temperature sensor, the humidity sensor interface circuit and the radio frequency energy collection circuit are arranged on the same chip, the communication antenna, The energy harvesting antenna, the humidity sensor and the off-chip printed capacitor are arranged on the label; the communication antenna, the off-chip printed capacitor, the processing circuit, the electrically erasable programmable read-only The memory, the humidity sensor interface circuit, the temperature sensor and the radio frequency energy collection circuit are respectively connected to the radio frequency and analog front-end circuit; the radio frequency and analog front-end circuit, the EEPROM, The temperature sensor and the humidity sensor interface circuit are respectively connected to the processing circuit; the energy collection antenna and the off-chip printed capacitor are respectively connected to the radio frequency energy collection circuit; the humidity sensor is connected to the humidity Sensor interface circuit connection;

The communication antenna is used to receive a first radio frequency energy and a radio frequency signal;

The energy collection antenna is used to collect the second radio frequency energy;

The radio frequency energy collection circuit is used to convert the second radio frequency energy into electrical energy, and transmit the electrical energy to the off-chip printed capacitor;

The off-chip printed capacitor is used to store the electrical energy and transmit the electrical energy to the radio frequency and analog front-end circuits;

The radio frequency and analog front-end circuit is used to convert the first radio frequency energy into a DC power supply, use the DC power supply or the electric energy to provide the temperature sensor, the humidity sensor interface circuit, the electrically erasable programming the read-only memory, the radio frequency and analog front-end circuit, the processing circuit and the radio frequency energy harvesting circuit; demodulating the radio frequency signal into a low-frequency digital signal, and sending the low-frequency digital signal to the processing a circuit; generating a clock signal and a reset signal, and sending the clock signal and the reset signal to the processing circuit;

The temperature sensor is used to measure the temperature information of the label, convert the temperature information into a digital signal, and send the digital signal to the processing circuit;

The humidity sensor is used to convert the humidity information of the label into a capacitance value;

The humidity sensor interface circuit is used to read the capacitance value and send the capacitance value to the processing circuit;

The processing circuit is configured to receive the digital signal and the capacitance value, read the temperature value in the digital signal, and store the temperature value and the capacitance value in the electrically erasable programmable only Read memory; read the temperature value and the capacitance value in the EEPROM, convert the capacitance value into a relative humidity value, and compare the relative humidity value and the temperature value to perform temperature compensation to obtain a corrected relative humidity value and a corrected temperature value, and store the corrected relative humidity value and the corrected temperature value in the electrically erasable programmable read-only memory ; Receive the low-frequency digital signal, and perform information read and write operations; receive the clock signal and the reset signal;

The EEPROM is used to store the temperature value, the capacitance value, the corrected relative humidity value and the corrected temperature value.

Preferably, the RF and analog front-end circuits include:

Bias circuit, radio frequency matching network circuit, clock and reset control signal generation circuit, radio frequency rectification circuit and wireless data transceiver circuit;

The radio frequency rectification circuit and the wireless data transceiver circuit are respectively connected to the radio frequency matching network circuit; the bias circuit is connected to the radio frequency matching network circuit, the clock and reset control signal generation circuit, and the radio frequency rectification circuit , the wireless data transceiver circuit, the EEPROM, the processing circuit, the temperature sensor, the humidity sensor interface circuit, and the radio frequency energy collection circuit are respectively connected; the wireless data transceiver The circuit, the clock and reset control signal generation circuit are respectively connected to the processing circuit;

The radio frequency matching network circuit is used to connect with the communication antenna and receive the first radio frequency energy and the radio frequency signal;

The radio frequency rectification circuit is configured to receive the first radio frequency energy output by the radio frequency matching network circuit and convert the first radio frequency energy into DC power, and transmit the DC power to the bias circuit;

The bias circuit is used to receive the DC power supply, and is used for the temperature sensor, the humidity sensor interface circuit, the electrically erasable programmable read-only memory, the radio frequency and analog front-end circuit, the processing The circuit and the radio frequency energy harvesting circuit are powered;

The wireless data transceiver circuit is configured to receive the radio frequency signal output by the radio frequency matching network circuit, demodulate the radio frequency signal into a low frequency digital signal, and send the low frequency digital signal to the processing circuit;

The clock and reset control signal generating circuit is used to generate a clock signal and a reset signal, and send the clock signal and the reset signal to the processing circuit.

Preferably, the energy harvesting antenna includes an off-chip printed GSM-900 frequency band antenna.

Preferably, the radio frequency energy harvesting circuit includes:

GSM-900 frequency band radio frequency matching network circuit and rectification boost charging circuit; the GSM-900 frequency band radio frequency matching network circuit is connected to the rectification boost charging circuit;

The GSM-900 frequency band radio frequency matching network circuit is used to connect with the off-chip printed GSM-900 frequency band antenna, receive the second radio frequency energy, and send it to the rectification boost charging circuit;

The rectifying and boosting charging circuit is used to connect with the off-chip printed capacitor, receive the second radio frequency energy, convert the second radio frequency energy into electrical energy, and send the electrical energy to the chip external printed capacitors.

Preferably, the processing circuit is also used for:

controlling the EEPROM, the temperature sensor and the humidity sensor to start.

Preferably, the processing circuit controls the startup of the EEPROM, specifically for:

Sending a read memory command or a write memory command to the EEPROM.

Preferably, the processing circuit controls the startup of the temperature sensor and the humidity sensor, specifically for:

An activation signal is sent to the temperature sensor and the humidity sensor.

Preferably, the processing circuit includes a digital communication protocol and data processing circuit.

Preferably, the humidity sensor comprises an off-chip printed humidity sensor.

Preferably, the communication antenna includes an off-chip printed UHF communication antenna.

Compared with the prior art, the present invention has the following beneficial effects:

The present invention provides a wireless sensor node. An energy collection antenna collects second radio frequency energy. A radio frequency energy collection circuit converts the second radio frequency energy into electrical energy and stores it in the off-chip printed capacitor. The off-chip printed A type capacitor is connected to the radio frequency and the analog front-end circuit, and transmits the electric energy to the radio frequency and the analog front-end circuit, and the radio frequency and the analog front-end circuit can be the temperature sensor, the humidity sensor interface circuit, the electric The erasable programmable read-only memory, the radio frequency and analog front-end circuit, the processing circuit and the radio frequency energy harvesting circuit are powered, the temperature sensor and the humidity sensor can collect data, and it is no longer the communication antenna that receives the first The sensor information can only be collected after the radio frequency energy is activated, which solves the problem that the sensor information cannot be collected actively.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention, and those skilled in the art can also obtain other drawings according to the provided drawings without creative work.

FIG. 1 is a schematic structural diagram of a wireless sensor node provided by Embodiment 1 of the present invention;

Fig. 2 is the structural representation of radio frequency and analog front-end circuit provided by the present invention;

FIG. 3 is a schematic structural diagram of a wireless sensor node provided by Embodiment 2 of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The present invention provides a wireless sensor node. Referring to FIG. 1, the wireless sensor node includes:

Communication antenna 106, energy harvesting antenna 107, radio frequency and analog front-end circuit 105, processing circuit 104, EEPROM 103, temperature sensor 102, humidity sensor 101, humidity sensor interface circuit 110, off-chip printed capacitor 109 And radio frequency energy acquisition circuit 108; Radio frequency and analog front-end circuit 105, processing circuit 104, EEPROM 103, temperature sensor 102, humidity sensor interface circuit 110 and radio frequency energy acquisition circuit 108 are arranged on the same chip 1, The communication antenna 106, the energy harvesting antenna 107, the humidity sensor 101 and the off-chip printed capacitor 109 are arranged on the label.

It should be noted that the working frequency of the chip 1 is compatible with the international UHF radio frequency identification standard ISO18000-6C and EPCClass-1Generation-2.

Communication antenna 106, off-chip printed capacitor 109, processing circuit 104, EEPROM 103, humidity sensor interface circuit 110, temperature sensor 102 and radio frequency energy collection circuit 108 are respectively connected to radio frequency and analog front end circuit 105; RF and analog front-end circuit 105, EEPROM 103, temperature sensor 102 and humidity sensor interface circuit 110 are respectively connected with processing circuit 104; energy harvesting antenna 107 and off-chip printed capacitor 109 are respectively connected with radio frequency energy harvesting circuit 108 is connected; the humidity sensor 101 is connected with the humidity sensor interface circuit 110;

a communication antenna 106, configured to receive a first radio frequency energy and a radio frequency signal;

It should be noted that the communication antenna 106 is connected to the chip 1 by flip-chip bonding, and the communication antenna 106 receives the first radio frequency energy and radio frequency signal sent by the reader.

Optionally, in another embodiment of the present invention, the communication antenna 106 includes an off-chip printed UHF communication antenna.

Specifically, the communication antenna 106 includes a printed 915MHZ ultra-high frequency antenna.

An energy collection antenna 107, configured to collect second radio frequency energy;

Optionally, in another embodiment of the present invention, the energy harvesting antenna 107 includes an off-chip printed GSM-900 frequency band antenna.

Specifically, the energy harvesting antenna 107 can collect radio frequency energy whose frequency band is GSM-900. The energy harvesting antenna 107 is connected to the chip 1 by flip-chip welding.

A radio frequency energy collection circuit 108, configured to convert the second radio frequency energy into electrical energy, and transmit the electrical energy to an off-chip printed capacitor 109;

An off-chip printed capacitor 109 is used to store the electrical energy and transmit the electrical energy to the radio frequency and analog front-end circuit 105;

It should be noted that the off-chip printed capacitor 109 is made by a printed antenna process, and the capacitance value can be processed according to specific requirements. The off-chip printed capacitor 109 is connected to the chip 1 by flip-chip welding.

The radio frequency and analog front-end circuit 105 is used to convert the first radio frequency energy into a DC power supply, use the DC power supply or the electric energy as a temperature sensor 102, a humidity sensor interface circuit 110, and an electrically erasable programmable read-only memory 103 , radio frequency and analog front-end circuit 105, processing circuit 104 and radio frequency energy acquisition circuit 108 power supply; Described radio frequency signal is demodulated into low-frequency digital signal, and described low-frequency digital signal is sent to processing circuit 104; Produce clock signal and reset signal , and sending the clock signal and the reset signal to the processing circuit 104;

The temperature sensor 102 is used to measure the temperature information of the label, convert the temperature information into a digital signal, and send the digital signal to the processing circuit 104;

It should be noted that the temperature sensor 102 is designed and manufactured in a silicon chip, and the temperature sensor 102 and the processing circuit 104 are connected through an interface circuit.

The humidity sensor 101 is used to convert the humidity information of the label into a capacitance value;

A humidity sensor interface circuit 110, configured to read the capacitance value and send the capacitance value to the processing circuit 104;

Optionally, in another embodiment of the present invention, the humidity sensor 101 includes an off-chip printed humidity sensor.

It should be noted that the humidity sensor 101 is connected to the chip 1 through flip-chip bonding, and the humidity sensor 101 and the processing circuit 104 are connected through the humidity sensor interface circuit 110 . Part of the humidity sensor 101 has holes to facilitate air circulation and ensure the accuracy of the data measured by the humidity sensor 101 .

Specifically, the humidity sensor 101 is a metal interdigitated capacitor, and the dielectric layer of the humidity sensor 101 is a polyimide humidity-sensitive film material. Changes in the humidity of the external environment can change the dielectric constant of the medium layer, thereby changing the capacitance value of the humidity sensor 101 .

The temperature sensor 102 and the humidity sensor 101 respectively include: a printed capacitor lower plate, a printed interdigitated capacitor upper plate and a polyimide humidity-sensitive film medium layer.

The processing circuit 104 is configured to receive the digital signal and the capacitance value, read the temperature value in the digital signal, and store the temperature value and the capacitance value in the EEPROM 103 In; read the temperature value and the capacitance value in the EEPROM 103, convert the capacitance value into a relative humidity value, and perform temperature calculation on the relative humidity value and the temperature value Compensate, obtain the corrected relative humidity value and the corrected temperature value, and store the corrected relative humidity value and the corrected temperature value in the EEPROM 103; receive the Low-frequency digital signals, and read and write information operations; receive the clock signal and the reset signal;

Optionally, in another embodiment of the present invention, the processing circuit 104 includes a digital communication protocol and data processing circuit.

It should be noted that the processing circuit 104 may implement an anti-collision mechanism.

The EEPROM 103 is used for storing the temperature value, the capacitance value, the corrected relative humidity value and the corrected temperature value.

It should be noted that the EEPROM 103 can save data after power off to avoid loss. The storage capacity of the EEPROM 103 is configured according to actual application requirements. The EEPROM 103 is connected to the processing circuit 104 through an interface circuit.

Wherein, the temperature sensor 102, the humidity sensor 101 and the EEPROM 103 work alternately, so as to reduce chip loss.

The working process of each circuit in the present embodiment is as follows:

The energy collection antenna 107 collects the second radio frequency energy, the radio frequency energy collection circuit 108 converts the second radio frequency energy into electric energy, and transmits the electric energy to the off-chip printed capacitor 109, the off-chip printed capacitor 109 stores the electric energy, and The power is transmitted to the RF and analog front-end circuit 105 . After the communication antenna 106 receives the first radio frequency energy and the radio frequency signal, the radio frequency and analog front-end circuit 105 converts the first radio frequency energy into a DC power supply, utilizes the DC power supply or the electric energy as the temperature sensor 102, the humidity sensor interface Circuit 110, EEPROM 103, RF and analog front-end circuit 105, processing circuit 104 and RF energy acquisition circuit 108 are powered; the RF signal is demodulated into a low-frequency digital signal, and the low-frequency digital signal is Send to the processing circuit 104 ; generate a clock signal and a reset signal, and send the clock signal and the reset signal to the processing circuit 104 .

The temperature sensor 102 measures the temperature information of the label, converts the temperature information into a digital signal, and sends the digital signal to the processing circuit 104; the humidity sensor interface circuit 110 reads the capacitance value, and sends the capacitance value to the processing circuit 104 ; The processing circuit 104 receives the digital signal and the capacitance value, reads the temperature value in the digital signal, and stores the temperature value and the capacitance value in the EEPROM 103; reading the temperature value and the capacitance value in the EEPROM 103, converting the capacitance value into a relative humidity value, and performing temperature compensation on the relative humidity value and the temperature value, Obtain the corrected relative humidity value and the corrected temperature value, and store the corrected relative humidity value and the corrected temperature value in the EEPROM 103; the processing circuit 104 can also receiving the low-frequency digital signal, and performing information read and write operations; receiving the clock signal and the reset signal.

It should be noted that the processing circuit 104 receives the low-frequency digital signal mainly for reading the received information and writing the information and then sending it to the communication antenna 106 and then sending it to the reader through the communication antenna 106 . The RF and analog front-end circuit 105 provides a clock signal and a reset signal for the processing circuit 104 to ensure that the processing circuit 104 works normally.

In this embodiment, when the electric energy stored in the off-chip printed capacitor 109 is sufficient to ensure the normal operation of the chip 1, the electric energy stored in the off-chip printed capacitor 109 is preferentially used for power supply, and when the electric energy stored in the off-chip printed capacitor 109 When the normal operation of the chip 1 cannot be guaranteed, the DC power converted by the radio frequency and the analog front-end circuit 105 is also required to power the chip 1 at this time.

In this embodiment, the energy collection antenna 107 collects the second radio frequency energy, and the radio frequency energy collection circuit 108 converts the second radio frequency energy into electrical energy and stores it in the off-chip printed capacitor 109, and the off-chip printed capacitor 109 is connected with the radio frequency and the analog The front-end circuit 105 is connected, and the electric energy is transmitted to the radio frequency and the analog front-end circuit 105. The radio frequency and the analog front-end circuit 105 can be the temperature sensor 102, the humidity sensor interface circuit 110, the electrically erasable programmable read-only memory 103, the radio frequency and the analog front-end circuit 105. The analog front-end circuit 105, the processing circuit 104 and the radio frequency energy acquisition circuit 108 are powered, the temperature sensor 102 and the humidity sensor 101 can collect data, and the sensor information can no longer be collected until the communication antenna 106 receives the first radio frequency energy, which solves the problem of not being able to actively collect Problems with sensor information.

In addition, when the electric energy in the off-chip printed capacitor 109 enables each module on the chip 1 to work, the processing circuit 104 can also send the information to be sent to the communication antenna 106, and then transmit it to the reader to realize active signal transmission function.

Optionally, in another embodiment of the present invention, referring to FIG. 2, the radio frequency and analog front-end circuit 105 includes:

Bias circuit 1054, radio frequency matching network circuit 1051, clock and reset control signal generation circuit 1055, radio frequency rectification circuit 1052 and wireless data transceiver circuit 1053;

The radio frequency rectification circuit 1052 and the wireless data transceiver circuit 1053 are respectively connected to the radio frequency matching network circuit 1051; the bias circuit 1054 is connected to the radio frequency matching network circuit 1051, the clock and reset control signal generation circuit 1055, the radio frequency rectification circuit 1052, the wireless data transceiver circuit 1053, Electrically erasable programmable read-only memory 103, processing circuit 104, temperature sensor 102, humidity sensor interface circuit 110 and radio frequency energy acquisition circuit 108 are connected respectively; 104 connection;

a radio frequency matching network circuit 1051, configured to be connected to the communication antenna 106, and receive the first radio frequency energy and the radio frequency signal;

It should be noted that the radio frequency matching network circuit 1051 can receive the first radio frequency energy and the radio frequency signal to the maximum extent. At the same time, only when the radio frequency matching network circuit 1051 receives enough radio frequency energy, the chip 1 can start to work.

A radio frequency rectification circuit 1052, configured to receive the first radio frequency energy output by the radio frequency matching network circuit 1051 and convert the first radio frequency energy into DC power, and transmit the DC power to the bias circuit 1054;

The bias circuit 1054 is used to receive the DC power supply, and is used for the temperature sensor 102, the humidity sensor interface circuit 110, the electrically erasable programmable read-only memory 103, the radio frequency and analog front-end circuit 105, the processing circuit 104 and the radio frequency energy collection circuit 108 power supply;

It should be noted that the operating voltages of different circuits may be different, and in this case, the bias circuit 1054 needs to perform boosting or stepping down operations to meet the requirements of operating voltages of different circuits.

The wireless data transceiving circuit 1053 is configured to receive the radio frequency signal output by the radio frequency matching network circuit 1051, demodulate the radio frequency signal into a low frequency digital signal, and send the low frequency digital signal to the processing circuit 104;

The clock and reset control signal generating circuit 1055 is configured to generate a clock signal and a reset signal, and send the clock signal and the reset signal to the processing circuit 104 .

The specific working process of each circuit in this embodiment is as follows:

The radio frequency matching network circuit 1051 receives the first radio frequency energy and the radio frequency signal sent by the communication antenna 106, and the radio frequency rectification circuit 1052 receives the first radio frequency energy output by the radio frequency matching network circuit 1051 and converts the first radio frequency energy into a DC power supply, And transmit the DC power to the bias circuit 1054; the bias circuit 1054 receives the DC power, and provides temperature sensor 102, humidity sensor interface circuit 110, EEPROM 103, radio frequency and analog front-end circuit 105. The processing circuit 104 and the radio frequency energy acquisition circuit 108 supply power; the wireless data transceiver circuit 1053 receives the radio frequency signal output by the radio frequency matching network circuit 1051, demodulates the radio frequency signal into a low-frequency digital signal, and sends the low-frequency digital signal to processing circuit 104 . The clock and reset control signal generation circuit 1055 generates a clock signal and a reset signal, and sends the clock signal and the reset signal to the processing circuit 104 .

In this embodiment, the radio frequency energy and the radio frequency signal sent by the communication antenna 106 are received through the radio frequency matching network circuit 1051, and the radio frequency rectification circuit 1052 converts the radio frequency energy into DC power, and the bias circuit 1054 is used as a temperature sensor 102. Humidity sensor interface circuit 110, EEPROM 103, radio frequency and analog front-end circuit 105, processing circuit 104 and radio frequency energy acquisition circuit 108 provide power supply, which can save costs without using batteries for power supply.

Optionally, in another embodiment of the present invention, referring to FIG. 3 , the radio frequency energy collection circuit 108 includes:

GSM-900 frequency band radio frequency matching network circuit 1081 and rectification boost charging circuit 1082; GSM-900 frequency band radio frequency matching network circuit 1081 is connected with rectification boost charging circuit 1082;

The GSM-900 frequency band radio frequency matching network circuit 1081 is used to connect with the off-chip printed GSM-900 frequency band antenna, receive the second radio frequency energy, and send it to the rectification boost charging circuit 1082;

The rectification boost charging circuit 1082 is used to connect with the off-chip printed capacitor 109, receive the second radio frequency energy, convert the second radio frequency energy into electric energy, and send the electric energy to the off-chip printed capacitor 109.

In this embodiment, the working process of each circuit is as follows:

The GSM-900 frequency band radio frequency matching network circuit 1081 receives the second radio frequency energy sent by the off-chip printed GSM-900 frequency band antenna, and sends it to the rectification boost charging circuit 1082, and the rectification boost charging circuit 1082 receives the second radio frequency energy , and convert the second radio frequency energy into electrical energy, and store the electrical energy in the off-chip printed capacitor 109 .

In this embodiment, the rectifying and boosting charging circuit 1082 converts the second radio frequency energy into electrical energy, and stores the electrical energy in the off-chip printed capacitor 109. When the power in the off-chip printed capacitor 109 is sufficient, the The function of actively collecting sensor information and transmitting radio frequency signals.

Optionally, in another embodiment of the present invention, the processing circuit 104 is also used to:

Control the EEPROM 103, the temperature sensor 102 and the humidity sensor 101 to start.

The processing circuit 104 controls the EEPROM 103 to start, specifically for:

A read memory command or a write memory command is sent to the EEPROM 103 .

Specifically, according to the timing requirements of the EEPROM 103, the processing circuit 104 will generate a read memory command or a write memory command, and send the read memory command or write memory command to the EEPROM memory 103.

The processing circuit 104 controls the temperature sensor 102 and the humidity sensor 101 to start, specifically for:

An activation signal is sent to the temperature sensor 102 and the humidity sensor 101 .

It should be noted that the temperature sensor 102 and the humidity sensor 101 are CMOS low power consumption sensors, and the temperature sensor 102 and the humidity sensor 101 can be started by using the write command, and the control words of the temperature sensor 102 and the humidity sensor 101 are stored in In the first byte of the user data area in the EEPROM 103, the control word includes information such as the type and measurement accuracy of the sensor that needs to be started, when the temperature sensor 102 and the humidity sensor 101 need to be started , the chip 1 receives the write command signal, and writes the specified data in the second byte of the user area in the electric erasable programmable read-only memory 103 circuit, and when the processing circuit 104 receives the write command signal, writes the specified data to the temperature The sensor 102 and the humidity sensor 101 send a start signal, and then send a control word to control the temperature sensor 102 and the humidity sensor 101 to work.

In this embodiment, the processing circuit 104 can control the EEPROM 103, the temperature sensor 102 and the humidity sensor 101 to start, and then control the above three circuits to work.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. a kind of wireless sensor node, which is characterized in that the wireless sensor node includes:

Communication antenna, energy acquisition antenna, radio frequency and analog front circuit, processing circuit, Electrically Erasable Programmable Read-Only Memory, The outer printing-type capacitor of temperature sensor, humidity sensor, humidity sensor interface circuit, piece and RF energy Acquisition Circuit；Institute State radio frequency and analog front circuit, the processing circuit, the Electrically Erasable Programmable Read-Only Memory, the temperature sensor, The humidity sensor interface circuit and the RF energy Acquisition Circuit are arranged on the same chip, the communication antenna, institute Energy acquisition antenna, the humidity sensor and described outer printing-type capacitor is stated to be arranged on label；The communication antenna, institute State the outer printing-type capacitor of piece, the processing circuit, the Electrically Erasable Programmable Read-Only Memory, humidity sensor interface electricity Road, the temperature sensor and the RF energy Acquisition Circuit are connect with the radio frequency with analog front circuit respectively；It is described Radio frequency and analog front circuit, the Electrically Erasable Programmable Read-Only Memory, the temperature sensor and the humidity sensor Interface circuit is connect with the processing circuit respectively；The energy acquisition antenna and described outer printing-type capacitor respectively with it is described The connection of RF energy Acquisition Circuit；The humidity sensor is connect with the humidity sensor interface circuit；

The communication antenna, for receiving the first RF energy and radiofrequency signal；

The energy acquisition antenna, for acquiring the second RF energy；

The RF energy Acquisition Circuit for second RF energy to be converted to electric energy, and the electric energy is transferred to Described outer printing-type capacitor；

Described outer printing-type capacitor is transferred to the radio frequency and AFE(analog front end) for storing the electric energy, and by the electric energy Circuit；

The radio frequency and analog front circuit, for first RF energy to be converted to DC power supply, utilizes the direct current Power supply or the electric energy, which are the temperature sensor, the humidity sensor interface circuit, the electric erazable programmable is read-only deposits Reservoir, the radio frequency and analog front circuit, the processing circuit and RF energy Acquisition Circuit power supply；By the radio frequency Signal is demodulated into low-frequency digital signal and the low-frequency digital signal is sent to the processing circuit；Generate clock signal and The clock signal and the reset signal are simultaneously sent to the processing circuit by reset signal；Wherein, when printing-type electricity outside piece It the use of the electric energy stored in printing-type capacitor outside piece is described when the electric energy stored in appearance can guarantee that the chip works normally Chip power supply needs radio frequency when the electric energy stored in printing-type capacitor outside piece cannot be guaranteed that the chip works normally at this time It is simultaneously that the chip is powered with the electric energy stored in printing-type capacitor outside the DC power supply and piece of analog front circuit conversion；

Temperature information is converted into digital signal for measuring the temperature information of label by the temperature sensor, and by the number Word signal is sent to the processing circuit；

The humidity sensor, for the humidity information of label to be converted into capacitance；

The humidity sensor interface circuit is sent to the processing electricity for reading the capacitance, and by the capacitance Road；

The processing circuit, for receiving the digital signal and the capacitance, reading temperature value in the digital signal, And the temperature value and the capacitance are stored in the Electrically Erasable Programmable Read-Only Memory；Reading the electrically erasable can The capacitance is converted to rh value and to institute by the temperature value and the capacitance in program read-only memory It states rh value and the temperature value and carries out temperature-compensating, the temperature value after rh value and correction after being corrected, And the rh value after the correction and the temperature value after the correction are stored in the read-only storage of the electric erazable programmable In device；It receives the low-frequency digital signal and carries out read and write information operation；Receive the clock signal and reset letter Number；

The Electrically Erasable Programmable Read-Only Memory, it is opposite after the temperature value, the capacitance, the correction for storing Temperature value after humidity value and the correction.

2. wireless sensor node according to claim 1, which is characterized in that the radio frequency and analog front circuit, packet It includes:

Biasing circuit, radio frequency matching network circuit, clock and reseting controling signal generation circuit, radio frequency rectification circuit and without line number According to transmission circuit；

The radio frequency rectification circuit, the wireless data transceiving circuit respectively with the radio frequency matching network circuit connection；It is described Biasing circuit and the radio frequency matching network circuit, the clock and reseting controling signal generation circuit, the radio frequency rectified current Road, the wireless data transceiving circuit, the Electrically Erasable Programmable Read-Only Memory, the processing circuit, the temperature sensing Device, the humidity sensor interface circuit, the RF energy Acquisition Circuit are separately connected；The wireless data transceiving circuit, The clock is connect with the processing circuit respectively with reseting controling signal generation circuit；

The radio frequency matching network circuit reception first RF energy and described is penetrated for connect with the communication antenna Frequency signal；

The radio frequency rectification circuit, for receiving first RF energy of the radio frequency matching network circuit output and by institute It states the first RF energy and is converted into DC power supply, and give the transmitting DC to the biasing circuit；

The biasing circuit for receiving the DC power supply, and is the temperature sensor, humidity sensor interface electricity Road, the Electrically Erasable Programmable Read-Only Memory, the radio frequency and analog front circuit, the processing circuit and the radio frequency energy Measure Acquisition Circuit power supply；

The wireless data transceiving circuit, for receiving the radiofrequency signal of the radio frequency matching network circuit output, by institute It states radiofrequency signal and is demodulated into low-frequency digital signal, and the low-frequency digital signal is sent to the processing circuit；

The clock and reseting controling signal generation circuit, believe for generating clock signal and reset signal, and by the clock Number and the reset signal be sent to the processing circuit.

3. wireless sensor node according to claim 1, which is characterized in that the energy acquisition antenna includes printing outside piece Brush GSM-900 band antenna.

4. wireless sensor node according to claim 3, which is characterized in that the RF energy Acquisition Circuit, comprising:

GSM-900 frequency range radio frequency matching network circuit and rectifier boost charging circuit；The GSM-900 frequency range radio frequency matching network Circuit is connect with the rectifier boost charging circuit；

The GSM-900 frequency range radio frequency matching network circuit receives institute for connecting with printing GSM-900 band antenna outside piece The second RF energy is stated, and is sent to the rectifier boost charging circuit；

The rectifier boost charging circuit, for described outer printing-type capacitance connection, reception second RF energy, and Electric energy is converted by second RF energy, and the electric energy is sent to described outer printing-type capacitor.

5. wireless sensor node according to claim 1, which is characterized in that the processing circuit is also used to:

Control the Electrically Erasable Programmable Read-Only Memory, the temperature sensor and humidity sensor starting.

6. wireless sensor node according to claim 5, which is characterized in that electrically erasable described in the processing circuit controls Programmable read only memory starting, is specifically used for:

Read memory command or memory write order are sent to the Electrically Erasable Programmable Read-Only Memory.

7. wireless sensor node according to claim 5, which is characterized in that temperature described in the processing circuit controls passes Sensor and humidity sensor starting, are specifically used for:

Enabling signal is sent to the temperature sensor and the humidity sensor.

8. wireless sensor node according to claim 1, which is characterized in that the processing circuit includes digital communication association View and data processing circuit.

9. wireless sensor node according to claim 1, which is characterized in that the humidity sensor includes printing outside piece Formula humidity sensor.

10. wireless sensor node according to claim 1, which is characterized in that the communication antenna includes printing outside piece SHF communication antenna.