CN216057052U - LoRa gateway and control circuit - Google Patents

Abstract

The utility model provides a LoRa gateway and a control circuit, which comprises a LoRa control circuit, a radio frequency module, a master control singlechip and an Ethernet drive module, wherein the LoRa control circuit is connected with the radio frequency module through a LoRa communication module; the master control single chip microcomputer is electrically connected with the radio frequency module through the MODEM bus; the master control single chip microcomputer is electrically connected with the Ethernet drive module through the SPI bus and the Ethernet control bus; the master control singlechip is electrically connected with the LoRa communication module through the STATE bus, the ACK bus, the LM bus and the data transceiving bus. Through above-mentioned master control singlechip and integrated loRa communication module, radio frequency module and ethernet module, fix communication frequency for 470MHz, solve the not enough problem of transmission distance among the prior art, realize 470MHz frequency remote communication to the low power dissipation, the interference killing feature is strong, improves system job stabilization nature simultaneously.

Description

LoRa gateway and control circuit

Technical Field

The utility model relates to the technical field of LoRa communication, in particular to a LoRa gateway and a control circuit.

Background

The Internet of things (IoT), i.e., "Internet of things," is an extended and expanded network based on the Internet, and combines various information sensing devices with the network to form a huge network, thereby realizing the interconnection and intercommunication of people, machines and things at any time and any place.

LoRa (Long Range) is an ultra-long distance wireless transmission scheme based on spread spectrum technology adopted and popularized by Semtech corporation in America. The LoRa network mainly comprises a terminal (which can be internally provided with a LoRa module), a gateway (or called a base station), a Server and a cloud, and application data can be transmitted in a two-way mode.

At present, the major design in the LoRa gateway product is the compatibility thereof, so that the stability of the long-distance communication and the cost are neglected, and the designed product cannot have the long-distance communication and the better anti-interference capability at the same time, and the cost is lower.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention has been made to provide an LoRa gateway and a control circuit that overcome or at least partially solve the above problems.

In order to solve the above problem, the present invention discloses a LoRa control circuit, which is used for controlling an LoRa gateway to perform data acquisition, and includes:

the system comprises a LoRa communication module, a radio frequency module, a master control singlechip and an Ethernet drive module;

the master control single chip microcomputer is electrically connected with the radio frequency module through a MODEM bus;

the master control single chip microcomputer is electrically connected with the Ethernet drive module through an SPI bus and an Ethernet control bus respectively;

the master control single chip microcomputer is electrically connected with the LoRa communication module through a STATE bus, an ACK bus, an LM bus and a data transceiving bus.

Preferably, the LoRa communication module includes:

the first display unit, the first filtering unit and the isolation unit;

one end of the first display unit is connected with a power supply end of the LoRa communication module, and the other end of the first display unit is connected with a STATE indication pin of the LoRa communication module through the STATE bus;

one end of the first filtering unit is connected with the power supply end of the LoRa communication module, and the other end of the first filtering unit is connected with the grounding end;

the grounding ends comprise an analog ground AGND and a reference ground GND; the analog ground AGND and the ground reference GND are connected through the isolation unit.

Preferably, the first display unit includes a first resistor and a first light emitting diode;

one end of the first resistor is connected with the power supply end of the LoRa communication module, and the other end of the first resistor is connected with the anode of the first light-emitting diode; and the cathode of the first light-emitting diode is connected with a STATE indication pin of the LoRa communication module through the STATE bus.

Preferably, the voltage of the power supply end of the LoRa communication module is 3.3V.

Preferably, the isolation unit is a 0 Ω resistor.

Preferably, the master control singlechip is a singlechip using a Cortex-M framework singlechip chip.

Preferably, the radio frequency module includes:

the 4G chip unit, the second display unit and the 4G level conversion unit;

the second display unit comprises a second light-emitting diode, the anode of which is connected with a NET _ SATUS pin of the 4G chip unit; the cathode of the second light emitting diode is connected with one end of a second resistor, and the other end of the second resistor is connected with a reference ground;

the MODEM _ TX pin and the MODEM _ RX pin of the 4G level conversion unit are correspondingly connected to a MODEM _ TX end and a MODEM _ RX end of the master control single chip microcomputer; the MAIN _ RXD pin and the MAIN _ TXD pin of the 4G level conversion unit are correspondingly connected to the MAIN _ RXD terminal and the MAIN _ TXD terminal of the 4G chip unit.

Preferably, the radio frequency module further comprises a 4G power switch unit and a 4G reset unit;

the 4G POWER switch unit comprises a first triode, a third resistor and a fourth resistor which are connected in series, wherein one end of the third resistor is connected to the MODEM _ POWER end of the master control single chip microcomputer; one end of the fourth resistor is connected with the reference ground; the series connection position of the third resistor and the fourth resistor is connected to the B pole of the first triode;

the C pole of the first triode is connected to the PWRKEY end of the 4G chip unit, and the E pole of the first triode is connected with the reference ground;

the 4G reset unit comprises a second triode, a fifth resistor and a sixth resistor which are connected in series, wherein one end of the fifth resistor is connected to the MODEM _ RST end of the master control singlechip; one end of the sixth resistor is connected with the reference ground; the series connection position of the fifth resistor and the sixth resistor is connected to the B pole of the second triode;

the C pole of the second triode is connected to the RESET end of the 4G chip unit, and the E pole of the second triode is connected with the reference ground.

Preferably, the ethernet driving module comprises an ethernet chip unit and an oscillation generating unit;

the oscillation generating unit comprises a crystal oscillator, two resonance capacitors and a seventh resistor;

the frequency of the crystal oscillator is 25 MHz; the capacity of the two resonance capacitors is 10 pF;

one end of the crystal oscillator is connected to the XO end of the Ethernet chip unit, and the other end of the crystal oscillator is connected to the XI end of the Ethernet chip unit.

The utility model discloses an LoRa gateway, which supports multi-mode data acquisition and comprises a shell and a PCBA arranged in the shell;

the PCBA is provided with the LoRa control circuit.

The utility model has the following advantages:

through LoRa communication module, radio frequency module, master control singlechip and Ethernet drive module; the master control single chip microcomputer is electrically connected with the radio frequency module through a MODEM bus; the master control single chip microcomputer is electrically connected with the Ethernet drive module through an SPI bus and an Ethernet control bus; the master control singlechip is electrically connected with the LoRa communication module through a STATE bus, an ACK bus, an LM bus and a data transceiving bus. Through above-mentioned master control singlechip and integrated loRa communication module, radio frequency module and ethernet module, fix communication frequency for 470MHz, solve the not enough problem of transmission distance among the prior art, realize 470MHz frequency remote communication to the low power dissipation, the interference killing feature is strong, improves system job stabilization nature simultaneously.

Drawings

Fig. 1 is a block diagram of a LoRa control circuit according to the present invention;

fig. 2 is a schematic circuit diagram of an LoRa communication module of an LoRa control circuit according to the present invention;

fig. 3 is a schematic circuit diagram of a master control single chip of the LoRa control circuit according to the present invention;

fig. 4 is a schematic circuit diagram of a radio frequency module of a LoRa control circuit according to the present invention;

fig. 5 is a schematic circuit diagram of an ethernet driver module of a LoRa control circuit according to the present invention.

The drawings illustrate the following:

1. a LoRa communication module; 2. a master control singlechip; 3. a radio frequency module; 4. an Ethernet drive module; 11. a first display unit; 12. an isolation unit; 13. a first filtering unit; 21. a second filtering unit; 31. 4G chip units; 32. a second display unit; 33. a 4G power switch unit; 34. a 4G level conversion unit; 35. a 4G reset unit; 41. an oscillation generating unit.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, the present application is described in further detail with reference to the accompanying drawings and the detailed description. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that LoRa is Long Range Radio (Long Range Radio), and its greatest characteristic is that the distance of propagation is longer than that of other Radio modes under the same power consumption condition, so that the unification of low power consumption and Long distance is realized.

Referring to fig. 1 to 5, an LoRa control circuit according to the present invention is shown, where the LoRa control circuit is configured to control an LoRa gateway to support multimode data acquisition, and specifically may include:

the system comprises a LoRa communication module 1, a radio frequency module 3, a master control singlechip 2 and an Ethernet drive module 4; the master control single chip microcomputer 2 is electrically connected with the radio frequency module 3 through a MODEM bus; the main control single chip microcomputer 2 is electrically connected with the Ethernet drive module 4 through an SPI bus and an Ethernet control bus; the master control single chip microcomputer 2 is electrically connected with the LoRa communication module 1 through a STATE bus, an ACK bus, an LM bus and a data transceiving bus; the communication frequency of the LoRa communication module 1 is 470 MHz.

In the embodiment of the application, the LoRa communication module 1, the radio frequency module 3, the master control singlechip 2 and the Ethernet drive module 4 are used; the master control single chip microcomputer 2 is electrically connected with the radio frequency module 3 through a MODEM bus; the main control single chip microcomputer 2 is electrically connected with the Ethernet drive module 4 through an SPI bus and an Ethernet control bus; the master control single chip microcomputer 2 is electrically connected with the LoRa communication module 1 through a STATE bus, an ACK bus, an LM bus and a data transceiving bus; the communication frequency of the LoRa communication module 1 is 470 MHz. Through above-mentioned master control singlechip 2 and integrated loRa communication module 1, radio frequency module 3 and ethernet module 4, fix communication frequency for 470MHz, solve the not enough problem of transmission distance among the prior art, realize 470MHz frequency telecommunication, and during the work, through radio frequency module 3 or ethernet drive module 4 networking support multi-mode communication, when choosing a communication mode, with another communication mode of automatic shutdown, thereby reduce the communication power consumption, the interference killing feature is strong, improve system job stabilization nature simultaneously.

Next, a LoRa control circuit in the present exemplary embodiment will be further described.

In an embodiment of the present application, the LoRa control circuit includes: the system comprises a LoRa communication module 1, a radio frequency module 3, a master control singlechip 2 and an Ethernet drive module 4; the master control single chip microcomputer 2 is electrically connected with the radio frequency module 3 through a MODEM bus; the main control single chip microcomputer 2 is electrically connected with the Ethernet drive module 4 through an SPI bus and an Ethernet control bus; the master control single chip microcomputer 2 is electrically connected with the LoRa communication module 1 through a STATE bus, an ACK bus, an LM bus and a data receiving and transmitting bus, wherein the data receiving and transmitting bus comprises TXD and RXD communication ends for full-duplex communication; the communication frequency of the LoRa communication module 1 is 470 MHz; as shown in fig. 2, the LoRa communication module 1 includes: a first display unit 11 and a first filtering unit 12 and an isolation unit 13; one end of the first display unit 11 is connected to the power supply terminal LoRa _3V3 of the LoRa communication module 1 set, and the other end is connected to the STATE bus of the LoRa communication module 1; one end of the first filtering unit 12 is connected to the power supply end LoRa _3V3 of the LoRa communication module, and the other end is connected to the ground end of the power supply end of the LoRa communication module; the grounding ends comprise an analog ground AGND and a reference ground GND; the analog ground AGND and the ground reference GND are connected 13 through the isolation unit.

In the above embodiment, the first display unit 11 is used for displaying the working state of the LoRa communication module 1; the first filtering unit 12 is configured to filter the power supply noise of the power supply terminal LoRa _3V3, reduce power supply noise interference occurring at the power supply terminal LoRa _3V3, communicate the analog ground AGND and the ground reference GND through the isolation unit 13, and isolate ripple interference between the analog ground AGND and the ground reference GND.

In an embodiment of the present application, the first display unit 11 includes a first resistor R1 and a first light emitting diode LED 1; one end of the first resistor R1 is connected to the power supply terminal LoRa _3V3 of the LoRa communication module 1, and the other end is connected to the anode of the first light emitting diode LED 1; the cathode of the first light emitting diode LED1 is connected to the STATE bus; the first resistor R1 can be a 0-1K omega resistor, and in this embodiment, a 1K omega resistor is preferred. The LED1 and the STATE bus connected with the LED1 are used for displaying the STATE, so that the working STATE of the LoRa module 1 can be reflected in real time.

In an embodiment, as shown in fig. 2, the LoRa module 1 adopts an LM400T as a main unit, the 1 st pin and the 2 nd pin are connected to the power supply terminal LoRa _3V3, and the voltage of the power supply terminal LoRa _3V3 of the LoRa communication module 1 is dc 3.3V; pins 3, 41, 42, 46 and 48 are ground reference GND pins which are connected with a ground reference GND in the circuit, a pin 24 is an analog ground AGND pin which is connected with an analog ground AGND in the circuit, a 0 omega resistor R2 is connected between the ground reference GND and the analog ground, and a 0 omega resistor R2 is used as an isolation unit to isolate the ground reference GND and the analog ground AGND; it should be noted that AGND (analog ground), which is connected to GND (reference ground) using magnetic beads of a specific filtering band under strict requirements; the application uses a 0 omega resistor as an isolation unit; a large number of experiments verify that the 0 omega resistor has an inhibiting effect on ripples of almost all frequency bands, and the 0 omega resistor replaces magnetic beads for connection, so that the cost is lower, and the technical effect of inhibiting the ripples of almost all frequency bands is achieved;

the LoRa module 1 is connected to one end of a capacitor C1 through a 16 pin RST of the LM400T, and the other end of the capacitor C1 is connected to a ground GND for enabling reset of the LoRa module 1, wherein the capacitor C1 is preferably 0.1 μ F; the first filter unit 12 at least comprises two filter capacitors of a capacitor C2 and a capacitor C3, wherein C2 is connected between the analog ground AGND and the power supply terminal LoRa _3V3, preferably a 1 μ F filter capacitor; the capacitor C3 is connected between the ground reference GND and the power supply end LoRa _3V3, and is preferably a 0.1 muF filter capacitor; the communication ends TXD and RXD are connected with the master control single chip microcomputer 2, and particularly, the communication ends TXD _ LM400T and RXD _ LM400T are connected with the master control single chip microcomputer 2 for communication; the LM _ IO5 communication end is connected with the main control single chip microcomputer 2 through an IO5 pin of the 30 th, and the main control single chip microcomputer is used for ad hoc network configuration; through the SLEEP pin 31, when the pin is at low level, the LoRa module 1 enters into deep SLEEP state; through 34 th pin WAKE (awaken pin), when this pin level is to the falling edge, awaken the module the loRa module 1 to can make the loRa module 1 get into dormancy state when not communicating, realize the communication that fixed communication frequency is 470MHz when working, carry out the energy-conserving of sleep when not working.

In an embodiment of the present application, the master control single chip 2 is a single chip that uses a Cortex-M architecture single chip; the Cortex-M architecture single chip is an STM32L412CBT6 main control chip;

as an example, the master singlechip is a singlechip using a Cortex-M architecture singlechip chip; the Cortex-M architecture single chip is an STM32L412CBT6 main control chip; compared with the current similar products, the STM32L412CBT6 master control chip which is used as a low-cost Cortex-M series inner core single chip microcomputer greatly reduces the cost of the LoRa gateway; the gateway has the functions of remote configuration parameters, system upgrading and the like, is provided with an Ethernet port, and can transmit data wirelessly or by using the Ethernet port; supporting the configuration of parameters such as gateway IP address, port and the like; the utility model uses Cortex-M series single chip microcomputer, thereby greatly reducing the equipment cost.

In an embodiment of the present application, as shown in fig. 4, the rf module 3 includes: a 4G chip unit 31, a second display unit 32, a 4G level conversion unit 34, a 4G power switch unit 33, and a 4G reset unit 35; the second display unit 32 includes a second light emitting diode LED2 having an anode connected to the NET _ SATUS pin of the 4G chip unit 31; the cathode of the second light emitting diode LED2 is connected with one end of a second resistor R7, and the other end of the second resistor R7 is connected with the ground GND; the second resistor R7 can be a 0-1K omega resistor, and in the embodiment, a 0 omega resistor is preferred; the 34-unit MODEM _ TX pin and the MODEM _ RX pin of the 4G level conversion unit are correspondingly connected to a transmitting end MODEM _ TX and a receiving end MODEM _ RX of a MODEM bus of the master control single-chip microcomputer 2; the MAIN _ RXD pin and the MAIN _ TXD pin of the 4G level shifter unit 34 are connected to the receiving terminal MAIN _ RXD and the transmitting terminal MAIN _ TXD of the 4G chip unit 31, respectively.

In a specific embodiment, as shown in fig. 3, the main control single chip 2 includes a second filtering unit 21, the second filtering unit 21 is configured to filter a power supply loop of the main control single chip power supply end MCU _ VCC to the ground GND, and the second filtering unit includes a capacitor C4, a capacitor C5, a capacitor C6, and a capacitor C7, and the capacities thereof are selected from 0.1 μ F to 10 μ F, and particularly, preferably, the capacity of the capacitor C4 is 10 μ F, the capacity of the capacitor C5 is 1 μ F, the capacity of the capacitor C6 is 1 μ F, and the capacity of the capacitor C7 is 0.1 μ F;

as an example, the main control single chip microcomputer 2 is connected to the memory chip through a 14 th pin FLASH _ CS of the main control chip, and is used for chip selection of the memory chip; the SPI1_ SCK, the SPI1_ MISO and the SPI1_ MOSI are connected to the Ethernet drive module 4 for communication; the Ethernet control bus is connected with and controls the Ethernet drive module 4, specifically, the W5500RST end of the Ethernet control bus controls the reset of the Ethernet drive module 4, the W5500INT end of the Ethernet control bus controls the initialization of the Ethernet drive module 4 during working, and the W5500SCS end of the Ethernet control bus controls the chip selection of a main control chip of the Ethernet module 4; the LM _ ACK end is connected with the LoRa module 1 and used for acquiring the communication state of the LoRa module 1; connect to LoRa module 1 through LM _ DEF terminal, when the user needs to restore the configuration status of LoRa module 1 to factory value.

In an embodiment of the present application, as shown in fig. 4, the 4G POWER switch unit 33 includes a first transistor Q1, a third resistor R9 and a fourth resistor R10 connected in series, where one end of the third resistor R9 is connected to a MODEM _ POWER end of the master single chip microcomputer; one end of the fourth resistor R10 is connected with the ground GND; the serial connection position of the third resistor R9 and the fourth resistor R10 is connected to the B pole of the first triode Q1; the C pole of the first triode Q1 is connected to the PWRKEY end of the 4G chip unit 31, and the E pole of the first triode Q1 is connected to the ground GND; the 4G chip unit 31 is used for controlling power supply through the master control singlechip 2;

the 4G reset unit 35 includes a second triode Q2, a fifth resistor R11 and a sixth resistor R12 connected in series, wherein one end of the fifth resistor R11 is connected to the MODEM _ RST end of the master control single chip microcomputer 3; one end of the sixth resistor R12 is connected with the ground GND; the serial connection position of the fifth resistor R11 and the sixth resistor R12 is connected to the B pole of the second triode Q2; the C pole of the second triode Q2 is connected to the RESET end of the 4G chip unit 31, and the E pole of the second triode Q2 is connected to the ground GND; wherein, the resistors R9 and R11 are preferably 1K omega resistors, and the resistors R10 and R12 are preferably 10K omega resistors;

the radio frequency module 3 further comprises a 4G level conversion unit 34, wherein the 4G level conversion unit 34 is connected to a MODEM bus of the master control single-chip microcomputer and an MANI bus of the radio frequency module and is used for converting a bus communication level of the MODEM into an MANI communication level of the radio frequency module 3, and specifically, communication levels of a MODEM _ TX end and a MODEM _ RX end of the MODEM bus are converted into communication levels of a MANI _ RXD end and a MANI _ TXD end; wherein, the 4G level conversion unit 34 is further connected to a filter capacitor C8 and a PWRKEY terminal of the 4G chip unit 31, and level conversion is triggered by a level of the PWRKEY terminal, wherein the capacitor C8 preferably has a filter capacitor of 0.1 μ F capacity; the PWRKEY level is filtered through a filter capacitor C8, clutter interference in the signal is removed, and the signal is more stable; the power supply of the 4G level conversion unit 34 is connected to the power supply end MCU _ VCC of the main control single chip microcomputer 2 and the filter capacitor C9, and is used for converting the power supply of the power supply end MCU _ VCC of the 3 main control single chip microcomputer 2 into the PWRKEY level of the PWRKEY end of the 4G chip unit 31 of the radio frequency module 3; the filter capacitor C9 is used for filtering power supply noise waves input to the 4G level conversion unit 34 from the power supply end MCU _ VCC of the main control single chip microcomputer 2; among them, the capacitor C9 is preferably a filter capacitor with the capacity of 1 muF;

as an example, the 4G chip unit 3 is further connected with a USIM unit (not shown in the figure) through a USIM bus, and is configured to perform 4G data transmission through a 4G network chip card of the internet of things; specifically, a USIM _ VDD end supplies power to a USIM unit, a USIM _ DET end is connected with the USIM unit and grounded through a resistor R8 and used for detecting whether a USIM chip card exists in the USIM, a USIM _ DATA end is used for carrying out DATA transmission with the USIM unit, and a USIM _ CLK end is used for providing an operation clock of the USIM unit; the USIM _ RST end is used for providing a USIM unit reset signal, and the USIM _ GND end is used for connecting a grounding loop of the USIM unit.

In an embodiment of the present application, as shown in fig. 5, the ethernet driving module 4 includes an ethernet chip unit and an oscillation generating unit 41; the oscillation generating unit 41 comprises a crystal oscillator Y1, two resonant capacitors CY1, CY2 and a seventh resistor R17, wherein the resonant capacitors CY1 and CY2 are the same and preferably have 1pF capacity, and the seventh resistor R17 is preferably a 1M Ω resistor; the frequency of the crystal oscillator is 25MHz and is used for the working frequency of the Ethernet chip; the capacity of the two resonance capacitors is 10 pF; one end of the crystal oscillator is connected to the XO end of the Ethernet chip unit, and the other end of the crystal oscillator is connected to the XI end of the Ethernet chip unit.

As an example, the ethernet driver module 4 further includes a TXN terminal, a TXP terminal, an RXN terminal, and an RXP terminal, and is configured to receive and transmit network data of ethernet number; the power supply end of the Ethernet driving module 4 is preferably connected with VCC3.3V direct current power supply; the VCC3V3A is analog 3.3V power supply, and the VCC3V3D is 3.3V digital power supply.

In an embodiment of the present application, a LoRa gateway is further disclosed, where the LoRa gateway supports multi-mode data acquisition, and the LoRa gateway includes a housing and a PCBA disposed in the housing; the PCBA includes the LoRa control circuit.

Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.

The LoRa gateway and the control circuit provided by the present invention are described in detail above, and a specific example is applied in the present document to explain the principle and the implementation of the present invention, and the description of the above embodiment is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims (10)

1. The utility model provides a loRa control circuit, its characterized in that, the circuit is used for controlling the loRa gateway and carries out data acquisition, includes:

the system comprises a LoRa communication module, a radio frequency module, a master control singlechip and an Ethernet drive module;

the master control single chip microcomputer is electrically connected with the radio frequency module through a MODEM bus;

the master control single chip microcomputer is electrically connected with the Ethernet drive module through an SPI bus and an Ethernet control bus respectively;

the master control single chip microcomputer is electrically connected with the LoRa communication module through a STATE bus, an ACK bus, an LM bus and a data transceiving bus.

2. The LoRa control circuit of claim 1, wherein the LoRa communication module comprises:

the first display unit, the first filtering unit and the isolation unit;

one end of the first display unit is connected with a power supply end of the LoRa communication module, and the other end of the first display unit is connected with a STATE indication pin of the LoRa communication module through the STATE bus;

one end of the first filtering unit is connected with the power supply end of the LoRa communication module, and the other end of the first filtering unit is connected with the grounding end;

the grounding ends comprise an analog ground AGND and a reference ground GND; the analog ground AGND and the ground reference GND are connected through the isolation unit.

3. The LoRa control circuit of claim 2, wherein the first display unit includes a first resistor and a first light emitting diode;

one end of the first resistor is connected with the power supply end of the LoRa communication module, and the other end of the first resistor is connected with the anode of the first light-emitting diode; and the cathode of the first light-emitting diode is connected with a STATE indication pin of the LoRa communication module through the STATE bus.

4. The LoRa control circuit of claim 2 or 3, characterized in that, the voltage of the power supply end of LoRa communication module is direct current 3.3V.

5. The LoRa control circuit of claim 2, wherein the isolation unit is a 0 Ω resistor.

6. The LoRa control circuit of claim 1, wherein the master singlechip is a singlechip using a Cortex-M architecture singlechip chip.

7. The LoRa control circuit of claim 1, wherein the rf module comprises:

the 4G chip unit, the second display unit and the 4G level conversion unit;

the second display unit comprises a second light-emitting diode, the anode of which is connected with a NET _ SATUS pin of the 4G chip unit; the cathode of the second light emitting diode is connected with one end of a second resistor, and the other end of the second resistor is connected with a reference ground;

the MODEM _ TX pin and the MODEM _ RX pin of the 4G level conversion unit are correspondingly connected to a MODEM _ TX end and a MODEM _ RX end of the master control single chip microcomputer; the MAIN _ RXD pin and the MAIN _ TXD pin of the 4G level conversion unit are correspondingly connected to the MAIN _ RXD terminal and the MAIN _ TXD terminal of the 4G chip unit.

8. The LoRa control circuit of claim 7, wherein the RF module further comprises a 4G power switch unit and a 4G reset unit;

the 4G POWER switch unit comprises a first triode, a third resistor and a fourth resistor which are connected in series, wherein one end of the third resistor is connected to the MODEM _ POWER end of the master control single chip microcomputer; one end of the fourth resistor is connected with the reference ground; the series connection position of the third resistor and the fourth resistor is connected to the B pole of the first triode;

the C pole of the first triode is connected to the PWRKEY end of the 4G chip unit, and the E pole of the first triode is connected with the reference ground;

the 4G reset unit comprises a second triode, a fifth resistor and a sixth resistor which are connected in series, wherein one end of the fifth resistor is connected to the MODEM _ RST end of the master control singlechip; one end of the sixth resistor is connected with the reference ground; the series connection position of the fifth resistor and the sixth resistor is connected to the B pole of the second triode;

the C pole of the second triode is connected to the RESET end of the 4G chip unit, and the E pole of the second triode is connected with the reference ground.

9. The LoRa control circuit of claim 1, wherein the ethernet driver module comprises an ethernet chip unit and an oscillation generating unit;

the oscillation generating unit comprises a crystal oscillator, two resonance capacitors and a seventh resistor;

the frequency of the crystal oscillator is 25 MHz; the capacity of the two resonance capacitors is 10 pF;

one end of the crystal oscillator is connected to the XO end of the Ethernet chip unit, and the other end of the crystal oscillator is connected to the XI end of the Ethernet chip unit.

10. An LoRa gateway, wherein the LoRa gateway supports multi-mode data acquisition, the LoRa gateway comprising a housing and a PCBA disposed within the housing;

the PCBA is provided with a LoRa control circuit as claimed in any one of claims 1-9.

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