CN212381210U

CN212381210U - Wireless module

Info

Publication number: CN212381210U
Application number: CN202020950513.XU
Authority: CN
Inventors: 朱文燕; 郑伟; 范海涛; 李建军
Original assignee: Huizhou Gaoshengda Technology Co Ltd
Current assignee: Huizhou Gaoshengda Technology Co Ltd
Priority date: 2020-05-29
Filing date: 2020-05-29
Publication date: 2021-01-19
Anticipated expiration: 2030-05-29

Abstract

The utility model discloses a wireless module, through setting up master control IC, power module, communication serial port module, antenna switching module and reset module, because DC/DC conversion unit and LDO conversion unit, for the voltage of output two kinds of values, when master control IC's type changes, the user can select the voltage of two kinds of values in a flexible way according to actual needs, let wireless module can adapt most types of radio frequency chip, improve wireless module's compatibility; in addition, the printed antenna unit and the external antenna unit are arranged, so that the wireless module integrates two modes of an internal antenna and an external antenna, a user can flexibly select and use the wireless module according to actual needs, and the flexibility of the wireless module is greatly improved; moreover, the setting of module that resets can let master control IC carry out automatic re-setting operation under the great condition of voltage fluctuation, and guarantee master control IC can normal use, improves wireless module's reliability.

Description

Wireless module

Technical Field

The utility model relates to a wireless transmission technology field especially relates to a wireless module.

Background

Along with the more and more extensive of internet of things connection demand, smart home, intelligence is dressed, the wisdom traffic, the high-speed development of internet of things applications such as smart city, the development of internet of things has been driven, we also more and more urgent needs are based on wireless technology's such as wiFi, bluetooth application support, consequently, this product of wireless module has just been extended, birth of wireless module, can let the product possess wireless communication's function, let the interaction of data not only limit at inside mutual, but extended the data interaction between product and the product.

However, the existing wireless module has the following disadvantages:

firstly, the existing wireless module is poor in compatibility because the radio frequency chips in the wireless modules on the market are selected in a single manner, namely, a circuit built by one wireless module is generally only used for one type of radio frequency chip, and if a customer proposes that the radio frequency chip needs to be replaced, the wireless module needs to redesign one type of module according to the radio frequency chip required by the customer, so that the existing wireless module is poor in compatibility;

secondly, the antenna of the existing wireless module is generally designed in a printed antenna or external antenna mode, the printed antenna and a PCB are designed into a whole, so that the performance of the printed antenna can be more stable, the printed antenna does not need to be debugged in a later period, the antenna is externally pulled, when the antenna is damaged, a user can replace the antenna in time for repairing, but the existing wireless module does not integrate the two modes, so that the existing wireless module cannot be flexibly selected according to actual needs;

third, most of the existing wireless modules do not have an automatic reset function, and if the wireless module encounters an emergency, the existing wireless module is likely to be damaged due to the fact that the existing wireless module cannot be automatically reset, resulting in poor reliability of the existing wireless module.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the weak point among the prior art, provide one kind compatible strong, can adapt most types of radio frequency chip, integrated built-in antenna and draw the antenna dual mode outward, the wireless module that the flexibility is high and possess the automatic re-setting function.

The purpose of the utility model is realized through the following technical scheme:

a wireless module, comprising:

a master control IC;

the power supply module comprises a DC/DC conversion unit and an LDO conversion unit, wherein the input end of the DC/DC conversion unit is used for being connected with an external power supply, the output end of the DC/DC conversion unit is respectively connected with the input ends of the main control IC and the LDO conversion unit, and the output end of the LDO conversion unit is used for being connected with the main control IC;

the communication serial port module comprises a communication serial port unit and a connecting terminal, wherein the communication serial port unit is respectively connected with the master control IC, the output end of the DC/DC conversion unit, the 2 nd pin of the connecting terminal and the 3 rd pin of the connecting terminal, the 1 st pin of the connecting terminal is connected with the input end of the DC/DC conversion unit, the 4 th pin of the connecting terminal is grounded, and the connecting terminal is also used for being connected with an external product;

the antenna switching module comprises a switching unit, a printed antenna unit and a pull-out antenna unit, and the switching unit is respectively connected with the main control IC, the printed antenna unit and the pull-out antenna unit; and

and the reset module is connected with the master control IC and is also connected with the output end of the DC/DC conversion unit.

In one embodiment, the DC/DC conversion unit includes a voltage converter Q2, a capacitor C22, a capacitor C60, a capacitor C72, a capacitor C73, a resistor R8, a resistor R10, and an inductor L8, wherein a 1 st pin of the voltage converter Q2 is used as an input terminal of the DC/DC conversion unit, one end of the capacitor C22 is connected to the 1 st pin of the voltage converter Q2, the other end of the capacitor C22 is grounded, a 3 rd pin of the voltage converter Q2 is connected to one end of the inductor L8, the other end of the inductor L8 is connected to one end of the capacitor C60 as an output terminal of the DC/DC conversion unit, the other end of the capacitor C60 is grounded, the 1 st pin of the voltage converter Q2 is connected to one end of the capacitor C72 and the other end of the inductor L8, the other end of the capacitor C72 is grounded, and a 5 th pin of the voltage converter Q2 is connected to one end of the capacitor C73, One end of the resistor R8 is connected with one end of the resistor R10, the other end of the capacitor C73 and the other end of the resistor R8 are both connected with the other end of the inductor L8, the other end of the resistor R8 is grounded, and the 2 nd pin of the voltage converter Q2 is grounded.

In one embodiment, the LDO conversion unit includes a voltage converter U3, a capacitor C28, and a capacitor C29, a pin 3 of the voltage converter U3 serves as an input terminal of the LDO conversion unit, one end of the capacitor C28 is connected to the pin 3 of the voltage converter U3, the other end of the capacitor C28 is grounded, a pin 4 of the voltage converter U3 serves as an output terminal of the LDO conversion unit, one end of the capacitor C29 is connected to the pin 4 of the voltage converter U3, the other end of the capacitor C29 is grounded, a pin 1 of the voltage converter U3 is connected to the pin 3 of the voltage converter U3, and a pin 6 of the voltage converter U3 and a pin 7 of the voltage converter U3 are both grounded.

In one embodiment, the communication serial port unit includes a level shifter Q1, a resistor R1, a resistor R2, a resistor R5, a resistor R6, a resistor R9 and a capacitor C26, wherein a 1 st pin of the level shifter Q1 is connected to the master IC, a 2 nd pin of the level shifter Q1 is connected in series to the capacitor C26 and grounded, a 3 rd pin of the level shifter Q1 is connected to one end of the resistor R2, the other end of the resistor R2 is connected to a 2 nd pin of the connection terminal, a 4 th pin of the level shifter Q1 is connected to the master IC and one end of the resistor R5, respectively, the other end of the resistor R5 is connected to an output terminal of the DC/DC converting unit, a 5 th pin of the level shifter Q1 is connected in series to the resistor R6 and an output terminal of the DC/DC converting unit, a 6 th pin of the level shifter Q1 is connected to one end of the resistor R1, the other end of the resistor R1 is connected to the 3 rd pin of the connection terminal, one end of the resistor R9 is connected to the 6 th pin of the level shifter Q1, and the other end of the resistor R9 is connected to the input terminal of the DC/DC conversion unit.

In one embodiment, the communication serial port unit further includes an anti-static tube D2, an anti-static tube D4 and an anti-static tube D5, wherein the 1 st pin of the anti-static tube D2 is connected to the other end of the resistor R9, the 2 nd pin of the anti-static tube D2 is grounded, the 1 st pin of the anti-static tube D4 is connected to the other end of the resistor R1, the 2 nd pin of the anti-static tube D4 is grounded, the 1 st pin of the anti-static tube D5 is connected to the other end of the resistor R2, and the 2 nd pin of the anti-static tube D5 is grounded.

In one embodiment, the switching unit includes a single-pole double-throw switch SW1, an inductor L3, a capacitor C20 and a capacitor C21, a 1 st pin of the single-pole double-throw switch SW1 is connected to one end of the inductor L3, the other end of the inductor L3 is connected to the main control IC, the capacitor C20, a 2 nd pin of the single-pole double-throw switch SW1 is connected to the printed antenna unit, a 3 rd pin of the single-pole double-throw switch SW1 is connected to the pull-out antenna unit, one end of the capacitor C20 is connected to one end of the inductor L3, the other end of the capacitor C20 is grounded, one end of the capacitor C21 is connected to the other end of the inductor L3, and the other end of the capacitor C21 is grounded.

In one embodiment, the printed antenna unit includes a printed antenna ANT1, an inductor L2, and a capacitor C18, wherein a 1 st pin of the printed antenna ANT1 is connected in series with the inductor L2 and a 2 nd pin of the single-pole double-throw switch SW1, a 2 nd pin of the printed antenna ANT1 is grounded, one end of the capacitor C18 is connected with a 1 st pin of the printed antenna ANT1, and the other end of the capacitor C18 is grounded.

In one embodiment, the pull-out antenna unit includes a resistor R11 and a connection terminal CON1, one end of the resistor R11 is connected to the 3 rd pin of the single-pole double-throw switch SW1, the other end of the resistor R11 is connected to the 1 st pin of the connection terminal CON1, and the 2 nd pin and the 3 rd pin of the connection terminal CON1 are both grounded.

In one embodiment, the reset module includes a reset Q7 and a capacitor C74, the 2 nd pin of the reset Q7 is connected to the master IC, the 1 st pin of the reset is grounded, the 3 rd pin of the reset Q7 is respectively connected to the output terminal of the DC/DC conversion unit and one end of the capacitor C74, and the other end of the capacitor C74 is grounded.

The utility model discloses compare in prior art's advantage and beneficial effect as follows:

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic block diagram of a wireless module according to an embodiment of the present invention;

fig. 2 is a schematic circuit diagram of a DC/DC conversion unit according to an embodiment of the present invention;

fig. 3 is a schematic circuit diagram of an LDO switching unit according to an embodiment of the present invention;

fig. 4 is a schematic circuit diagram of a communication serial port module according to an embodiment of the present invention;

fig. 5 is a schematic circuit diagram of an antenna switching module according to an embodiment of the present invention;

fig. 6 is a schematic circuit diagram of a reset module according to an embodiment of the present invention.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1, a wireless module 10 includes a main control IC100, a power module 200, a communication serial port module 300, an antenna switching module 400, and a reset module 500.

Thus, it should be noted that the main control IC100 is a core unit of the wireless module 10, and plays a role in processing signals and controlling; the power module 200 is used for converting an externally input voltage; the communication serial port module 300 plays a role in connection, and connects the wireless module 10 with an external product for data interaction; the antenna switching module 400 is configured to switch between the internal antenna and the external antenna; the reset module 500 functions to automatically reset the master IC.

Referring to fig. 1, the power module 200 includes a DC/DC conversion unit 210 and an LDO conversion unit 220, an input end of the DC/DC conversion unit 210 is configured to be connected to an external power source, an output end of the DC/DC conversion unit 210 is respectively connected to input ends of the main control IC100 and the LDO conversion unit 220, and an output end of the LDO conversion unit 220 is configured to be connected to the main control IC 100.

Thus, it should be noted that, because the DC/DC conversion unit 210 and the LDO conversion unit 220 output voltages with two values, when the type of the main control IC100 changes, a user can flexibly select voltages with two values according to actual needs, so that the wireless module 10 can adapt to most types of radio frequency chips, and the compatibility of the wireless module 10 is improved.

Referring to fig. 1, the communication serial port module 300 includes a communication serial port unit 310 and a connection terminal 320, the communication serial port unit 310 is connected to the main control IC100, the output terminal of the DC/DC conversion unit 210, the 2 nd pin of the connection terminal 320, and the 3 rd pin of the connection terminal 320, respectively, the 1 st pin of the connection terminal 320 is connected to the input terminal of the DC/DC conversion unit 210, the 4 th pin of the connection terminal 320 is grounded, and the connection terminal 320 is further used for being connected to an external product.

Thus, it should be noted that the communication serial port unit 310 plays a role of level conversion; the connection terminal 320 is used for connecting the wireless module 10 with an external product, and completing corresponding data interaction.

Referring to fig. 1, the antenna switching module 400 includes a switching unit 410, a printed antenna unit 420 and a pull-out antenna unit 430, and the switching unit 410 is connected to the main control IC100, the printed antenna unit 420 and the pull-out antenna unit 430, respectively.

Thus, it should be noted that, the printed antenna unit 420 and the pull-out antenna unit 430 are arranged to integrate two modes of the built-in antenna and the pull-out antenna into the wireless module 10, so that a user can flexibly select the mode according to actual needs, that is, the mode of the built-in antenna or the mode of the pull-out antenna is flexibly switched by the switching unit 410, thereby greatly improving the flexibility of the wireless module 10.

Referring to fig. 1, the reset module 500 is connected to the main control IC100, and the reset module 500 is further connected to an output terminal of the DC/DC conversion unit 210.

In this way, it should be noted that the reset module 500 is configured to perform an automatic reset operation when the main control IC100 fails, so as to ensure that the main control IC100 can be normally used, and improve the reliability of the wireless module 10.

Further, referring to fig. 2, in an embodiment, the DC/DC conversion unit 210 includes a voltage converter Q2, a capacitor C22, a capacitor C60, a capacitor C72, a capacitor C73, a resistor R8, a resistor R10, and an inductor L8, a 1 st pin of the voltage converter Q2 is used as an input terminal of the DC/DC conversion unit 210, one end of the capacitor C22 is connected to the 1 st pin of the voltage converter Q2, the other end of the capacitor C22 is grounded, a 3 rd pin of the voltage converter Q2 is connected to one end of the inductor L8, the other end of the inductor L8 is used as an output terminal of the DC/DC conversion unit 210 and is connected to one end of the capacitor C60, the other end of the capacitor C9 is grounded, a 1 st pin of the voltage converter Q2 is connected to one end of the capacitor C72 and the other end of the inductor L8, the other end of the capacitor C72 is grounded, a 5 th pin of the voltage converter Q2 is connected to one end of the capacitor C36 73, one end of the resistor R, the other end of the capacitor C73 and the other end of the resistor R8 are both connected with the other end of the inductor L8, the other end of the resistor R8 is grounded, and the 2 nd pin of the voltage converter Q2 is grounded.

As described above, the voltage converter Q2 functions as a voltage converter; the capacitor C22 is a filter capacitor, and is used for filtering the voltage input by the external power supply to eliminate clutter; the inductor L8 and the capacitor C60 form a matching network according to the voltage converter Q2; the capacitor C72 plays a role in filtering; the resistor R8, the resistor R10 and the capacitor C73 form a negative feedback network, so that the voltage converter Q2 can stably output the converted voltage.

Further, referring to fig. 3, in an embodiment, the LDO conversion unit 220 includes a voltage converter U3, a capacitor C28 and a capacitor C29, a pin 3 of the voltage converter U3 serves as an input terminal of the LDO conversion unit 220, one end of the capacitor C28 is connected to the pin 3 of the voltage converter U3, the other end of the capacitor C28 is grounded, a pin 4 of the voltage converter U3 serves as an output terminal of the LDO conversion unit 220, one end of the capacitor C29 is connected to the pin 4 of the voltage converter U3, the other end of the capacitor C29 is grounded, a pin 1 of the voltage converter U3 is connected to the pin 3 of the voltage converter U3, and a pin 6 of the voltage converter U3 and a pin 7 of the voltage converter U3 are both grounded.

In this way, the voltage converter U3 functions as a voltage converter for converting the voltage input by the voltage converter Q2; the capacitor C28 and the capacitor C29 are both filter capacitors and play a role in filtering clutter signals.

It should be noted that, for example, the voltage converter Q2 converts a 5V voltage into a 3.3V voltage, the voltage converter U3 converts a 3.3V voltage into a 1.8V voltage, and when the main control IC is a 8710CM chip and a 8720CM chip, the 3.3V voltage and the 1.8V voltage need to be input into the main control IC100 at the same time; when the master control IC is 8720CF chip, 8710CX chip, or 8720CN chip, the LDO conversion unit 220 is stopped, and only the DC/DC conversion unit 210 is started to operate, which is to enable the wireless module 10 to adapt to most types of master control ICs 100 because two voltages can be converted in the wireless module 10, thereby greatly improving the compatibility of the wireless module 10.

Further, referring to fig. 4, in an embodiment, the communication serial port unit 310 includes a level shifter Q1, a resistor R1, a resistor R2, a resistor R5, a resistor R6, a resistor R9, and a capacitor C26, a pin 1 of the level shifter Q1 is connected to the master IC, a pin 2 of the level shifter Q1 is connected to ground, a pin 3 of the level shifter Q1 is connected to one end of the resistor R2, the other end of the resistor R2 is connected to a pin 2 of the connection terminal, a pin 4 of the level shifter Q1 is connected to the master IC100 and one end of the resistor R5, respectively, the other end of the resistor R5 is connected to the output terminal of the DC/DC conversion unit 210, a pin 5 of the level shifter Q1 is connected to the output terminal of the DC/DC conversion unit, a pin 6 of the level shifter Q1 is connected to one end of the resistor R1, the other end of the resistor R6342 is connected to the pin 3, and a pin R68628 is connected to the pin 6 of the level shifter Q1, the other end of the resistor R9 is connected to the input of the DC/DC conversion unit.

As such, the level shifter Q1 plays a role of level shifting; the resistor R1, the resistor R2 and the resistor R6 are all matched resistors; the resistor R5 and the resistor R9 are pull-up resistors; the capacitor C26 is a filter capacitor for filtering out clutter signals.

Further, referring to fig. 4, in an embodiment, the communication serial port unit 310 further includes an anti-static tube D2, an anti-static tube D4, and an anti-static tube D5, wherein a 1 st pin of the anti-static tube D2 is connected to the other end of the resistor R9, a 2 nd pin of the anti-static tube D2 is grounded, a 1 st pin of the anti-static tube D4 is connected to the other end of the resistor R1, a 2 nd pin of the anti-static tube D4 is grounded, a 1 st pin of the anti-static tube D5 is connected to the other end of the resistor R2, and a 2 nd pin of the anti-static tube D5 is grounded.

In this way, the anti-static tube D2, the anti-static tube D4, and the anti-static tube D5 all play a role of anti-static, and effectively prevent the wireless module 10 from being damaged by excessive static current.

Note also that the connection terminal 320 is a J1 component identified in fig. 4.

Further, referring to fig. 5, in an embodiment, the switching unit 410 includes a single-pole double-throw switch SW1, an inductor L3, a capacitor C20 and a capacitor C21, a 1 st pin of the single-pole double-throw switch SW1 is connected to one end of the inductor L3, the other end of the inductor L3 is connected to the main control IC100, a 2 nd pin of the capacitor C20 and the single-pole double-throw switch SW1 is connected to the printed antenna unit 420, a 3 rd pin of the single-pole double-throw switch SW1 is connected to the pull-out antenna unit 430, one end of the capacitor C20 is connected to one end of the inductor L3, the other end of the capacitor C20 is grounded, one end of the capacitor C21 is connected to the other end of the inductor L3, and the other end of the capacitor C21 is grounded.

In this way, when the internal antenna of the wireless module 10 needs to be enabled, the 1 st pin and the 2 nd pin of the single-pole double-throw switch SW1 are connected; when the antenna needs to be pulled out, the 1 st pin and the 3 rd pin of the single-pole double-throw switch SW1 are connected; the inductor L3, the capacitor C20, and the capacitor C21 form a matching network of the master IC100 for adjusting the RF performance of the master IC.

Further, referring to fig. 5, in an embodiment, the printed antenna unit 420 includes a printed antenna ANT1, an inductor L2, and a capacitor C18, wherein a 1 st pin of the printed antenna ANT1 is connected in series with the inductor L2 and a 2 nd pin of the single-pole double-throw switch SW1, a 2 nd pin of the printed antenna ANT1 is grounded, one end of the capacitor C18 is connected with the 1 st pin of the printed antenna ANT1, and the other end of the capacitor C18 is grounded.

As such, it should be noted that the printed antenna ANT1 plays a role of transmitting and receiving signals; the inductor L2 and the capacitor C18 are a matching network of the printed antenna ANT 1.

Further, referring to fig. 5, in an embodiment, the pull-out antenna unit 430 includes a resistor R11 and a connection terminal CON1, one end of the resistor R11 is connected to the 3 rd pin of the single-pole double-throw switch SW1, the other end of the resistor R11 is connected to the 1 st pin of the connection terminal CON1, and the 2 nd pin and the 3 rd pin of the connection terminal CON1 are both grounded.

In this way, when the external antenna needs to be connected, the external antenna may be plugged into the plug terminal CON 1.

Further, referring to fig. 6, in an embodiment, the reset module 500 includes a reset Q7 and a capacitor C74, a 2 nd pin of the reset Q7 is connected to the main control IC, a 1 st pin of the reset is grounded, a 3 rd pin of the reset Q7 is connected to the output terminal of the DC/DC conversion unit 210 and one end of the capacitor C74, respectively, and the other end of the capacitor C74 is grounded.

In this way, it should be noted that the resetter Q7 plays a role of resetting, so as to prevent the main control IC100 from being halted and the like under the condition of large voltage fluctuation, and the resetter Q7 can ensure the normal start and use of the main control IC 100.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A wireless module, comprising:

a master control IC;

2. The wireless module of claim 1, wherein the DC/DC converting unit comprises a voltage converter Q2, a capacitor C22, a capacitor C60, a capacitor C72, a capacitor C73, a resistor R8, a resistor R10 and an inductor L8, wherein the 1 st pin of the voltage converter Q2 is used as the input terminal of the DC/DC converting unit, one end of the capacitor C22 is connected with the 1 st pin of the voltage converter Q2, the other end of the capacitor C22 is grounded, the 3 rd pin of the voltage converter Q2 is connected with one end of the inductor L8, the other end of the inductor L8 is used as the output terminal of the DC/DC converting unit and is connected with one end of the capacitor C60, the other end of the capacitor C60 is grounded, the 1 st pin of the voltage converter Q2 is respectively connected with one end of the capacitor C72 and the other end of the inductor L8, the other end of the capacitor C72 is grounded, the 5 th pin of the voltage converter Q2 is respectively connected to one end of the capacitor C73, one end of the resistor R8 and one end of the resistor R10, the other end of the capacitor C73 and the other end of the resistor R8 are both connected to the other end of the inductor L8, the other end of the resistor R8 is grounded, and the 2 nd pin of the voltage converter Q2 is grounded.

3. The wireless module of claim 1, wherein the LDO conversion unit comprises a voltage converter U3, a capacitor C28 and a capacitor C29, wherein a pin 3 of the voltage converter U3 serves as an input terminal of the LDO conversion unit, one end of the capacitor C28 is connected to the pin 3 of the voltage converter U3, the other end of the capacitor C28 is grounded, a pin 4 of the voltage converter U3 serves as an output terminal of the LDO conversion unit, one end of the capacitor C29 is connected to the pin 4 of the voltage converter U3, the other end of the capacitor C29 is grounded, a pin 1 of the voltage converter U3 is connected to the pin 3 of the voltage converter U3, and a pin 6 of the voltage converter U3 and a pin 7 of the voltage converter U3 are both grounded.

4. The wireless module as claimed in claim 1, wherein the communication serial port unit includes a level shifter Q1, a resistor R1, a resistor R2, a resistor R5, a resistor R6, a resistor R9 and a capacitor C26, wherein a 1 st pin of the level shifter Q1 is connected to the master IC, a 2 nd pin of the level shifter Q1 is connected in series to the capacitor C26 in ground, a 3 rd pin of the level shifter Q1 is connected to one end of the resistor R2, the other end of the resistor R2 is connected to a 2 nd pin of the connection terminal, a 4 th pin of the level shifter Q1 is connected to the master IC and one end of the resistor R5, the other end of the resistor R5 is connected to an output terminal of the DC/DC converting unit, a 5 th pin of the level shifter Q1 is connected in series to the resistor R6 and the output terminal of the DC/DC converting unit, a 6 th pin of the level shifter Q1 is connected to one end of the resistor R1, the other end of the resistor R1 is connected to the 3 rd pin of the connection terminal, one end of the resistor R9 is connected to the 6 th pin of the level shifter Q1, and the other end of the resistor R9 is connected to the input terminal of the DC/DC conversion unit.

5. The wireless module of claim 4, wherein the communication serial port unit further comprises an anti-static tube D2, an anti-static tube D4 and an anti-static tube D5, wherein the 1 st pin of the anti-static tube D2 is connected to the other end of the resistor R9, the 2 nd pin of the anti-static tube D2 is grounded, the 1 st pin of the anti-static tube D4 is connected to the other end of the resistor R1, the 2 nd pin of the anti-static tube D4 is grounded, the 1 st pin of the anti-static tube D5 is connected to the other end of the resistor R2, and the 2 nd pin of the anti-static tube D5 is grounded.

6. The wireless module of claim 1, wherein the switching unit comprises a single-pole double-throw switch SW1, an inductor L3, a capacitor C20 and a capacitor C21, wherein a 1 st pin of the single-pole double-throw switch SW1 is connected with one end of the inductor L3, the other end of the inductor L3 is connected with the main control IC, the capacitor C20 is connected with a 2 nd pin of the single-pole double-throw switch SW1 and the printed antenna unit, a 3 rd pin of the single-pole double-throw switch SW1 is connected with the pull-out antenna unit, one end of the capacitor C20 is connected with one end of the inductor L3, the other end of the capacitor C20 is grounded, one end of the capacitor C21 is connected with the other end of the inductor L3, and the other end of the capacitor C21 is grounded.

7. The wireless module of claim 6, wherein the printed antenna unit comprises a printed antenna ANT1, an inductor L2 and a capacitor C18, wherein the 1 st pin of the printed antenna ANT1 is connected in series with the inductor L2 and the 2 nd pin of the single-pole double-throw switch SW1, the 2 nd pin of the printed antenna ANT1 is grounded, one end of the capacitor C18 is connected with the 1 st pin of the printed antenna ANT1, and the other end of the capacitor C18 is grounded.

8. The wireless module of claim 6, wherein the pull-out antenna unit comprises a resistor R11 and a connection terminal CON1, one end of the resistor R11 is connected to the 3 rd pin of the single-pole double-throw switch SW1, the other end of the resistor R11 is connected to the 1 st pin of the connection terminal CON1, and the 2 nd pin and the 3 rd pin of the connection terminal CON1 are both grounded.

9. The wireless module of claim 1, wherein the reset module comprises a reset Q7 and a capacitor C74, the 2 nd pin of the reset Q7 is connected to the master IC, the 1 st pin of the reset is grounded, the 3 rd pin of the reset Q7 is respectively connected to the output terminal of the DC/DC conversion unit and one end of the capacitor C74, and the other end of the capacitor C74 is grounded.