CN215642296U - IOT device - Google Patents

Abstract

The utility model is applied to the technical field of Internet of things, and provides an IOT device, which comprises: the wake-up circuit comprises a control chip, wherein the control chip comprises a universal asynchronous transmitter (UART) sending pin; IOT module, IOT module includes that first level conversion module, baseband chip, UART receive pin and power saving mode PSM awaken the pin up, the baseband chip with the first end of first level conversion module is connected, the second end of first level conversion module with the PSM awakens the pin up and connects, the PSM awaken the pin up with the UART sends the pin and connects. Thereby enabling switching of the wake-up logic.

Description

IOT device

Technical Field

The present invention relates to the field of internet of things technology, and more particularly, to an IOT device.

Background

The Internet of Things (IOT) device has the advantages of low power consumption, wide coverage, low cost, large capacity and the like, can be widely applied to various industries, and can be applied to the fields of remote meter reading, intelligent smoke sensing, intelligent traffic and the like. The IOT device includes wake-up circuit and IOT module, includes the baseband chip in the IOT module, under the Power Saving Mode (Power Saving Mode, PSM) of IOT module, only the real-time clock chip work in the baseband chip can save stand-by Power consumption to a great extent to can prolong the life of IOT module. However, the wake-up logic of the baseband chip in the IOT module may be different from that of the baseband chip in the IOT module, and how to implement the switching of the wake-up logic is an urgent technical problem to be solved.

SUMMERY OF THE UTILITY MODEL

Embodiments of the present invention provide an IOT device to solve a problem how to implement switching of wake-up logic.

In a first aspect, an embodiment of the present invention provides an IOT device, including:

the wake-up circuit comprises a control chip, wherein the control chip comprises a universal asynchronous transmitter (UART) sending pin;

IOT module, IOT module includes that first level conversion module, baseband chip, UART receive pin and power saving mode PSM awaken the pin up, the baseband chip with the first end of first level conversion module is connected, the second end of first level conversion module with the PSM awakens the pin up and connects, the PSM awaken the pin up with the UART sends the pin and connects.

Optionally, the wake-up circuit further includes a second level shift module, and the UART transmit pin is connected to a first end of the second level shift module;

the IOT module also comprises a UART receiving pin, and the UART receiving pin is connected with the second end of the second level conversion module.

Optionally, the second level shifter module includes a first switch tube, a first resistor, and a first capacitor;

the first end of the first switch tube is connected with the UART transmitting pin, the second end of the first switch tube is connected with the UART receiving pin, the control end of the first switch tube is connected with one end of the first resistor, the other end of the first resistor is connected with a first power supply end, and the first capacitor is connected with the first resistor in parallel.

Optionally, the power supply voltage of the control chip is less than the power supply voltage of the I/O port of the IOT module, and the output voltage of the first power supply end is the power supply voltage of the control chip.

Optionally, the power supply voltage of the control chip is greater than or equal to the power supply voltage of the I/O port of the IOT module, and the output voltage of the first power supply end is the power supply voltage of the I/O port.

Optionally, the second level conversion module further includes a second resistor, one end of the second resistor is connected to the second end of the first switch tube, the other end of the second resistor is connected to a third power supply end, and an output voltage of the third power supply end is an I/O port power supply voltage of the IOT module.

Optionally, the wake-up circuit further includes a third level conversion module, the power supply voltage of the control chip is less than the real-time clock RTC power supply voltage of the baseband chip, and the PSM wake-up pin is connected to the UART transmission pin through the third level conversion module.

Optionally, the third level shifter module includes a second switch tube, a third resistor, and a second capacitor;

the first end of the second switch tube is connected with the UART sending pin, the second end of the second switch tube is connected with the PSM awakening pin, the control end of the second switch tube is connected with one end of a third resistor, the other end of the third resistor is connected with a second power supply end, the second capacitor is connected with the third resistor in parallel, and the output voltage of the second power supply end is the power supply voltage of the control chip.

Optionally, the third level conversion module further includes a fourth resistor, one end of the fourth resistor is connected to the second end of the second switching tube, the other end of the fourth resistor is connected to a fourth power supply end, and an output voltage of the fourth power supply end is a power supply voltage of the IOT module.

Optionally, the baseband chip includes an RTC power pin and a chip wake-up pin, and the first level conversion module includes a third switching tube, a fourth switching tube, a fifth resistor, a third capacitor, a sixth resistor, and a seventh resistor;

the first end of the third switching tube is connected with the PSM wake-up pin, the second end of the third switching tube is connected with one end of a sixth resistor, the other end of the sixth resistor is connected with the RTC power pin, the control end of the third switching tube is connected with one end of a fifth resistor, the other end of the fifth resistor is connected with one end of a third capacitor, and the other end of the third capacitor is grounded;

the first end of the fourth switch tube is connected with the RTC power pin, the second end of the fourth switch tube is connected with the chip awakening pin, the control end of the fourth switch tube is connected with one end of the seventh resistor, and the other end of the seventh resistor is connected with the second end of the third switch tube.

In an embodiment of the present application, the IOT device includes: the wake-up circuit comprises a control chip, wherein the control chip comprises a universal asynchronous transmitter (UART) sending pin; IOT module, IOT module includes that first level conversion module, baseband chip, UART receive pin and power saving mode PSM awaken the pin up, the baseband chip with the first end of first level conversion module is connected, the second end of first level conversion module with the PSM awakens the pin up and connects, the PSM awaken the pin up with the UART sends the pin and connects. Thus, the switching of the wake-up logic can be realized by arranging the first level conversion module in the IOT module.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.

Fig. 1 is a schematic structural diagram of an IOT device according to an embodiment of the present invention;

fig. 2 is a second schematic structural diagram of an IOT device according to an embodiment of the present invention;

fig. 3 is a third schematic structural diagram of an IOT device according to an embodiment of the present invention;

FIG. 4 is a fourth schematic structural diagram of an IOT device according to an embodiment of the present invention;

fig. 5 is a fifth schematic structural diagram of an IOT device according to an embodiment of the present invention;

fig. 6 is a sixth schematic structural diagram of an IOT device according to an embodiment of the present invention;

fig. 7 is a seventh schematic structural diagram of an IOT device according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of a simulation of an IOT device according to an embodiment of the present invention;

FIG. 9 is a graph illustrating the simulation results of FIG. 8;

FIG. 10 is a second simulation diagram of an IOT device according to the second embodiment of the present invention;

fig. 11 is an eighth schematic structural diagram of an IOT device according to an embodiment of the present invention;

FIG. 12 is a third simulation diagram of an IOT device according to an embodiment of the present invention;

FIG. 13 is a graph illustrating the simulation results of FIG. 12;

fig. 14 is a fourth simulation diagram of an IOT device according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. 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 invention.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an IOT device according to an embodiment of the present invention, and as shown in fig. 1, the IOT device includes:

the wake-up circuit 1 comprises a control chip 11, wherein the control chip 11 comprises a universal asynchronous transmitter (UART) sending pin;

IOT module 2, IOT module 2 includes that first level conversion module 21, baseband chip 22, UART receive pin and power saving mode PSM awaken the pin up, baseband chip 22 with the first end of first level conversion module 21 is connected, the second end of first level conversion module 21 with the PSM awakens the pin up and connects, PSM awaken the pin up with the UART sends the pin and connects.

The IOT may be a Narrow-Band Internet of Things (NB-IOT). As shown in fig. 2, the PSM WAKE-up pin NB _ PSM _ WAKE may be directly connected to the UART transmit pin, or the PSM WAKE-up pin may be connected to the UART transmit pin through a third level shift module 13. For example, in a case that the power supply voltage of the control chip 11 is less than the real-time clock RTC power supply voltage of the baseband chip 22, the PSM wake-up pin may be connected to the UART transmit pin through the third level shift module 13; in the case that the power voltage of the control chip 11 is greater than or equal to the real-time clock RTC power voltage of the baseband chip 22, the PSM wake-up pin may be directly connected to the UART transmit pin.

As shown in fig. 1, the control chip 11 includes a UART transmit pin MCU _ UART _ TX, the wake-up circuit 1 may further include a second level shift module 12 and a third level shift module 13, the IOT module 2 may further include a power pin VBAT of the IOT module 2, and the power pin VBAT of the IOT module 2 may output a power voltage of the IOT module 2. The IOT module 2 may further include a UART receive pin NB _ UART _ RX and an I/O port power pin VDD _ EXT, the I/O port power pin VDD _ EXT may output an I/O port power voltage, and the I/O port level of the IOT module 2 may be led out from the VDD _ EXT pin. The baseband chip 22 may include a chip WAKE-up pin BB _ PSM _ WAKE and an RTC power supply pin BB _ V _ RTC. The chip WAKE-up pin BB _ PSM _ WAKE may be used to receive a chip WAKE-up signal to WAKE up the baseband chip 22. The RTC supply pin may output an RTC supply voltage. The voltage of the RTC power pin BB _ V _ RTC is the RTC internal power output of the baseband chip 22, and the power is generated by the LDO inside the baseband chip 22 and the power is still normally supplied in the PSM state.

It should be noted that, currently, the IOT device requires low-level wake-up, and different baseband chips 22 in the industry adopt different wake-up logics, for example, the RDA platform RDA8908A adopts high-level wake-up, and the MTK platform MT2625 adopts low-level wake-up, if the baseband chip 22 itself adopts high-level wake-up service logic, the interior of the IOT device needs to adopt a certain mode to realize the switching of the wake-up logics, otherwise, the IOT device cannot normally work after being woken up.

IOT is based on advantages such as self low-power consumption, wide coverage, low cost, large capacity and is applied to multiple trades in a large number, for example remote meter reading, wisdom agriculture and intelligent parking etc.. The IOT introduces an Extended Discontinuous Reception (eDRX) Power Saving technology and a Power Saving Mode (PSM) state, thereby further reducing Power consumption and prolonging the battery service time. In the PSM mode, the universal asynchronous receiver/transmitter (UART) of the IOT module 2 cannot communicate normally, and the UART can communicate normally only after the IOT module 2 wakes up and exits from the PSM mode. For an application scenario where it is expected to wake up the IOT module 2 directly from the UART, the prior art needs to ensure that the IOT module 2 wake-up logic is woken up with a low level, and if the IOT module 2 is woken up with a high level, the current leakage in the PSM state is increased to the IOT device. In addition, the wake-up logics of different baseband chips 22 are different, and if the baseband chip 22 adopts the high-level wake-up logic, the switch of the wake-up logics needs to be realized in a certain manner, in the embodiment of the present application, the first level conversion module 21 is adopted, so that the switch of the wake-up logics of the IOT module 2 can be realized, and one baseband chip 22 wakened up at a high level can be realized as low-level wake-up outside the IOT module 2; and at present, when the IOT device is woken up by a high level, the IOT device maintains the PSM state and needs a UART to output a low level, and the additional power consumption of the IOT device is increased in the PSM state. The level conversion module 102 is added for controlling the conversion between the chip 11UART interface level and the IOT module 2UART interface level, and because the mode I/O power is in the off state in the PSM state, the level conversion module does not bring extra power consumption to the device in the PSM mode.

In an embodiment of the present application, the IOT device includes: the wake-up circuit 1 comprises a control chip 11, wherein the control chip 11 comprises a universal asynchronous transmitter (UART) sending pin; IOT module 2, IOT module 2 includes that first level conversion module 21, baseband chip 22, UART receive pin and power saving mode PSM awaken the pin up, baseband chip 22 with the first end of first level conversion module 21 is connected, the second end of first level conversion module 21 with the PSM awakens the pin up and connects, PSM awaken the pin up with the UART sends the pin and connects. In this way, by providing the first level conversion module 21 in the IOT module 2, switching of the wake-up logic can be realized.

Optionally, as shown in fig. 1, the wake-up circuit 1 further includes a second level shift module 12, and the UART transmit pin is connected to a first end of the second level shift module 12;

the IOT module 2 further includes a UART receiving pin, and the UART receiving pin is connected to the second end of the second level shifter module 12.

It should be noted that, in the embodiment of the present application, the second level shift module 12 is added to control the conversion between the UART interface level of the chip 11 and the UART interface level of the IOT module 2, and because the I/O power of the IOT module 2 is in the off state in the PSM state, the second level shift module 12 does not bring extra power consumption to the apparatus in the PSM mode.

Optionally, as shown in fig. 3, the second level shift module 12 includes a first switching transistor VT1, a first resistor R1, and a first capacitor C1;

a first end of the first switch tube VT1 is connected to the UART transmit pin, a second end of the first switch tube VT1 is connected to the UART receive pin, a control end of the first switch tube VT1 is connected to one end of the first resistor R1, the other end of the first resistor R1 is connected to a first power supply end, and the first capacitor C1 is connected in parallel to the first resistor R1.

The first switching transistor VT1 may be a transistor, for example, an NPN transistor.

In this embodiment, the second level shift module 12 is configured by the first switching transistor VT1, the first resistor R1, and the first capacitor C1, so that level shifting can be preferably realized.

Optionally, the power supply voltage of the control chip 11 is smaller than the power supply voltage of the I/O port of the IOT module 2, and the output voltage of the first power supply end is the power supply voltage of the control chip 11.

The first power end may be connected to a power supply pin VIO _ MCU of the control chip 11, the power supply pin VIO _ MCU of the control chip 11 may output a power supply voltage of the control chip 11, and a power domain of the VIO _ MCU may be consistent with the MCU _ UART _ TX.

In this embodiment, the resistance of the first resistor R1 may be 4.7K Ω, the capacitance of the first capacitor C1 may be 10nF, and the resistance of the second resistor R2 may be 10K Ω.

Optionally, as shown in fig. 4, the power voltage of the control chip 11 is greater than or equal to the power voltage of the I/O port of the IOT module 2, and the output voltage of the first power end is the power voltage of the I/O port.

The first power terminal can be connected with an I/O port power pin VDD _ EXT, and the I/O port power pin VDD _ EXT can output an I/O port power voltage.

In this embodiment, the resistance of the first resistor R1 may be 4.7K Ω, the capacitance of the first capacitor C1 may be 10pF, and the resistance of the second resistor R2 may be 10K Ω.

Optionally, the second level shift module 12 further includes a second resistor R2, one end of the second resistor R2 is connected to the second end of the first switch tube, the other end of the second resistor R2 is connected to a third power supply terminal, and an output voltage of the third power supply terminal is an I/O port power supply voltage of the IOT module 2.

The resistance value of the second resistor R2 may be 10K Ω.

Optionally, the wake-up circuit 1 further includes a third level conversion module 13, the power voltage of the control chip 11 is less than the real-time clock RTC power voltage of the baseband chip 22, and the PSM wake-up pin is connected to the UART sending pin through the third level conversion module 13.

The third level shift module 13 may be configured to perform level shift on a level signal output by the UART transmit pin, so as to wake up the IOT module 2 to exit the PSM mode through the level-shifted signal.

It should be noted that, if the power voltage of the control chip 11 is greater than or equal to the real-time clock RTC power voltage of the baseband chip 22, the third level conversion module 13 may be omitted, as shown in fig. 2, the UART sending pin may be directly connected to the PSM wakeup pin. Because the internal first level conversion module 21 that has used of IOT module 2, when the power supply level of control chip 11 was higher than the internal RTC clock power supply level of IOT module 2, UART send pin can directly awaken the pin with PSM and be connected, can improve the space utilization of IOT device.

Optionally, as shown in fig. 5, the third level shift module 13 includes a second switching tube VT2, a third resistor R3, and a second capacitor C2;

the first end of the second switch tube VT2 is connected to the UART sending pin, the second end of the second switch tube VT2 is connected to the PSM wake-up pin, the control end of the second switch tube VT2 is connected to one end of the third resistor R3, the other end of the third resistor R3 is connected to a second power supply terminal, the second capacitor C2 is connected in parallel to the third resistor R3, and the output voltage of the second power supply terminal is the power supply voltage of the control chip 11.

The resistance of the third resistor R3 may be 4.7K Ω, and the capacitance of the second capacitor C2 may be 10 pF. The second switching transistor VT2 may be a transistor, for example, an NPN transistor.

It should be noted that, by using the first level shift module 21 inside the IOT module 2 and the third level shift module 13 in the wake-up circuit 1, the risk of failure when the level standard of the PSM wake-up interface of the IOT module is lower than the power voltage of the IOT module can be avoided.

Optionally, the third level shift module 13 further includes a fourth resistor R4, one end of the fourth resistor R4 is connected to the second end of the second switch tube, the other end of the fourth resistor R4 is connected to a fourth power supply terminal, and an output voltage of the fourth power supply terminal is a power supply voltage of the IOT module 2.

It should be noted that, because the IOT module 2 turns off the output of the I/O port power VDD _ EXT in the PSM state, in order to ensure that the IOT module 2 wakes up in the PSM state, the switching level of the third level shifter module 13 may use the power voltage VBAT of the IOT module 2.

Optionally, as shown in fig. 6, the baseband chip 22 includes an RTC power pin BB _ V _ RTC and a chip WAKE-up pin BB _ PSM _ WAKE, and the first level shift module 21 includes a third switching tube VT3, a fourth switching tube VT4, a fifth resistor R5, a third capacitor C3, a sixth resistor R6 and a seventh resistor R7;

a first end of the third switching tube VT3 is connected to the PSM wake-up pin, a second end of the third switching tube VT3 is connected to one end of the sixth resistor R6, the other end of the sixth resistor R6 is connected to the RTC power pin, a control end of the third switching tube VT3 is connected to one end of the fifth resistor R5, the other end of the fifth resistor R5 is connected to one end of the third capacitor C3, and the other end of the third capacitor C3 is grounded;

the first end of the fourth switching tube VT4 is connected to the RTC power pin, the second end of the fourth switching tube VT4 is connected to the chip wake-up pin, the control end of the fourth switching tube VT4 is connected to one end of the seventh resistor R7, and the other end of the seventh resistor R7 is connected to the second end of the third switching tube VT 3.

The third switching transistor VT3 may be a transistor, for example, an NPN transistor. The fourth switching transistor VT4 may be a triode, and may be a PNP triode, for example. The chip wake-up pin may be connected to one end of the eighth resistor, and the other end of the eighth resistor is grounded, so that the eighth resistor Rin in the baseband chip 22 is pulled down and grounded, and the baseband chip 22 is a baseband chip 22 woken up by a high level. The resistance of the fifth resistor R5 may be 100K Ω, the resistance of the sixth resistor R6 may be 100K Ω, the resistance of the seventh resistor R7 may be 10K Ω, the capacitance of the third capacitor C3 may be 100pF, and the resistance of the eighth resistor Rin may be 700K Ω.

In a specific embodiment, as shown in fig. 7, the baseband chip 22 of the IOT device uses RDA8908A of the RDA platform, and the baseband chip 22 uses high-level wake-up logic and has the same voltage domain as the RTC power domain. The designed power voltage VDD _ EXT of the I/O port of the IOT module is 1.8V, the power voltage BB _ V _ RTC of the RTC inside the baseband chip 22 is 1.08V, and the power voltage VIO _ MCU of the control chip 11 is 3.3V. A Multisim simulation model may be designed, and a simulation diagram is shown in fig. 8, where R _ UART is a pull-up resistor inside the control chip 11, the resistance value is 10K Ω, R5 ═ R6 ═ 100K Ω, R7 ═ 10K Ω, C3 ═ 100pF, Rin pull-down resistor is 700K Ω, the NPN transistor VT1 uses BC846BW in village, the NPN transistor VT3 and the PNP transistor VT4 use BC846BPDW1T1G in village, and the BC846BPDW1T1G integrates 1 NPN transistor and 1 PNP transistor. The function generator XFG1 may simulate data transmission when VPP is 3.3V and frequency is 600Hz, and UART _ TX is 0x 00. XSC1 is an oscilloscope.

The simulation results obtained by the simulation of fig. 8 are shown in fig. 9. As shown in the simulation data of fig. 9, when the MCU _ UART _ TX is at high level 3.3V, the internal WAKE-up signal BB _ PSM _ WAKE of the baseband chip 22 is at low level, and the IOT module 2 keeps PSM sleep state. When the MCU _ UART _ TX is low, the chip internal wake-up signal remains high, and the IOT module 2 is woken up from PSM.

The additional power consumption of the IOT device in the PSM state may be simulated using the simulation diagram shown in fig. 10. The IOT module 2 in PSM state is required to maintain low power consumption, and the peripheral wake-up circuit 1 and the internal level shifter module are required to not increase extra power consumption in PSM state. When the IOT module 2 is in PSM, the I/O power voltage VDD _ EXT is turned off, and the MCU _ UART _ TX maintains 3.3V high, both the transistors VT3 and VT4 are turned off, so that the first level shifter 21 does not bring extra power consumption to the IOT device. Simulation results show that by using the external wake-up circuit 1 and the first level conversion module 21 inside the IOT module 2, when the IOT module 2 is in the PSM state, no extra power consumption is brought to the IOT device, and the IOT device can directly use the UART interface of the control chip 11 to wake up on the premise of ensuring the low power consumption characteristic of the PSM state.

As another specific embodiment, a circuit shown in fig. 11 is simulated, where BB _ V _ RTC of the IOT module 2 is 2.5V, VBAT is 3.0-4.2V, VIO _ MCU of the control chip 11 is 1.8V, VDD _ EXT of the IOT module I/O port is 2.8V, and a Multisim simulation model may be designed, where R1R 3.7K Ω, C1C 2 is 10pF, R2R 4 is 10K Ω, R5R 6 is 100K Ω, R7 is 10K 737, C633 is 100pF, Rin pull-down resistor is 700K, and transistors 63 1, VT2 are based on cun, BW 84, BC84, NPN BC 1 and PNP 39 bpt 36 integrated with PNP 6314, PNP 1 VT 1. XSC2 is an oscilloscope.

The simulation results obtained by the simulation of fig. 12 are shown in fig. 13. The result shows that when the UART interface of the control chip 11 outputs a high level, the baseband chip 22 WAKEs up the BB _ PSM _ WAKE to a low level, and when the UART interface outputs a low level, the baseband chip 22 WAKEs up the BB _ PSM _ WAKE to a high level, which WAKEs up the module from the PSM state.

The additional power consumption of the IOT device in the PSM state may be simulated using the simulation diagram shown in fig. 14. When the IOT device maintains the PSM state, the UART interface of the control chip maintains high level output, and at the moment, because the triodes VT 2-VT 4 are all in a cut-off state, the level conversion module can not bring extra power consumption to the device.

The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

In the description of the present invention, it is to be understood that the terms "longitudinal", "radial", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it is to be noted that the terms "mounted," "disposed," and "connected" are to be construed broadly unless otherwise explicitly stated or limited. For example, the connection can be fixed, detachable or integrated; may be directly connected or indirectly connected through an intermediate. The fixed connection can be common technical schemes such as welding, threaded connection and clamping. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. An IOT device, the IOT device comprising:

the wake-up circuit comprises a control chip, wherein the control chip comprises a universal asynchronous transmitter (UART) sending pin;

IOT module, IOT module includes that first level conversion module, baseband chip, UART receive pin and power saving mode PSM awaken the pin up, the baseband chip with the first end of first level conversion module is connected, the second end of first level conversion module with the PSM awakens the pin up and connects, the PSM awaken the pin up with the UART sends the pin and connects.

2. The IOT device of claim 1, wherein the wake-up circuit further comprises a second level shift module, the UART transmit pin coupled to a first end of the second level shift module;

the IOT module also comprises a UART receiving pin, and the UART receiving pin is connected with the second end of the second level conversion module.

3. The IOT device of claim 2, wherein the second level shifter module comprises a first switch, a first resistor and a first capacitor;

the first end of the first switch tube is connected with the UART transmitting pin, the second end of the first switch tube is connected with the UART receiving pin, the control end of the first switch tube is connected with one end of the first resistor, the other end of the first resistor is connected with a first power supply end, and the first capacitor is connected with the first resistor in parallel.

4. The IOT device according to claim 3, wherein the power voltage of the control chip is lower than the power voltage of the I/O port of the IOT module, and the output voltage of the first power terminal is the power voltage of the control chip.

5. The IOT device according to claim 3, wherein the power voltage of the control chip is greater than or equal to the I/O port power voltage of the IOT module, and the output voltage of the first power terminal is the I/O port power voltage.

6. The IOT device of claim 3, wherein the second level shifter module further comprises a second resistor, one end of the second resistor is connected to the second end of the first switch, the other end of the second resistor is connected to a third power supply terminal, and an output voltage of the third power supply terminal is an I/O port power supply voltage of the IOT module.

7. The IOT device of claim 1, wherein the wake-up circuit further comprises a third level shift module, wherein the power supply voltage of the control chip is less than the RTC power supply voltage of the baseband chip, and wherein the PSM wake-up pin is connected to the UART transmit pin through the third level shift module.

8. The IOT device of claim 7, wherein the third level shift module comprises a second switch, a third resistor and a second capacitor;

the first end of the second switch tube is connected with the UART sending pin, the second end of the second switch tube is connected with the PSM awakening pin, the control end of the second switch tube is connected with one end of a third resistor, the other end of the third resistor is connected with a second power supply end, the second capacitor is connected with the third resistor in parallel, and the output voltage of the second power supply end is the power supply voltage of the control chip.

9. The IOT device of claim 8, wherein the third level shifting module further comprises a fourth resistor, one end of the fourth resistor is connected to the second end of the second switch, the other end of the fourth resistor is connected to a fourth power supply terminal, and an output voltage of the fourth power supply terminal is a power supply voltage of the IOT module.

10. The IOT device of claim 1, wherein the baseband chip comprises an RTC power pin and a chip wake-up pin, and the first level shifter module comprises a third switch transistor, a fourth switch transistor, a fifth resistor, a third capacitor, a sixth resistor and a seventh resistor;

the first end of the third switching tube is connected with the PSM wake-up pin, the second end of the third switching tube is connected with one end of a sixth resistor, the other end of the sixth resistor is connected with the RTC power pin, the control end of the third switching tube is connected with one end of a fifth resistor, the other end of the fifth resistor is connected with one end of a third capacitor, and the other end of the third capacitor is grounded;

the first end of the fourth switch tube is connected with the RTC power pin, the second end of the fourth switch tube is connected with the chip awakening pin, the control end of the fourth switch tube is connected with one end of the seventh resistor, and the other end of the seventh resistor is connected with the second end of the third switch tube.

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