CN113986262A - Upgrading interface management and mutual reset supporting circuit for MCU and IOT sub-equipment - Google Patents

Upgrading interface management and mutual reset supporting circuit for MCU and IOT sub-equipment Download PDF

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Publication number
CN113986262A
CN113986262A CN202111224214.3A CN202111224214A CN113986262A CN 113986262 A CN113986262 A CN 113986262A CN 202111224214 A CN202111224214 A CN 202111224214A CN 113986262 A CN113986262 A CN 113986262A
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resistor
internet
pin
sub
things
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张备战
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SHANGHAI SHUNDE INFORMATION TECHNOLOGY Co.,Ltd.
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Shanghai Kitking Electronic Co ltd
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Priority to CN202111224214.3A priority Critical patent/CN113986262A/en
Publication of CN113986262A publication Critical patent/CN113986262A/en
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F8/00—Arrangements for software engineering
    • G06F8/60—Software deployment
    • G06F8/61—Installation
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/24—Resetting means

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  • Theoretical Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Software Systems (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
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Abstract

The invention relates to an upgrade interface management and mutual reset supporting circuit for an MCU and an Internet of things sub-device, wherein the MCU adopts a Ruisarl 78 series MCU chip, and the upgrade interface management and mutual reset supporting circuit is characterized by comprising: the PMOS tube V1 is electrically connected between a VDD _5V pin of the Ralssa RL78 series MCU chip and a power supply port 5V _ B of the Internet of things sub-equipment; the isolation diode D20 is electrically connected between the TOOL0 pin of the Ralssa RL78 series MCU chip and an I/O port I/O _1 of the object linking sub-device; and the NMOS tube V2 is electrically connected between the RESET pin of the Ralssa RL78 series MCU chip and the I/O port II I/O _2 of the physical connection sub-device. The invention realizes that only the necessary program upgrading interface of the Ryssa RL78 series chip is used for resetting the Internet of things sub-equipment, and the Ryssa RL78 series chip can be reset and OTA upgraded through the Internet of things sub-system.

Description

Upgrading interface management and mutual reset supporting circuit for MCU and IOT sub-equipment
Technical Field
The invention relates to a circuit for performing upgrade interface management and mutual reset between a terminal main control unit and an Internet of things sub-device by taking a Ruisa RL78 series chip as an MCU (microprogrammed control Unit).
Background
The wide application of the internet of things technology deeply changes the living habits of people, from the vending cabinet to the sharing bicycle, from the urban traffic management to the production of the modern farming and pasturing industry, and from the production to the life, the heat tide of the internet of things technology is promoted.
The modern internet of things technology generally comprises control terminals, an internet of things sub-device connected to each control terminal and a cloud server. The cloud server is generally connected with the Internet of things sub-equipment through a wireless network, and the Internet of things sub-equipment is in serial port communication with the control terminal through a serial port. And the cloud server issues an instruction to the control terminal through the Internet of things sub-equipment to operate. Meanwhile, the control terminal uploads the acquired data and the execution result to the cloud server through the Internet of things sub-equipment. Because the internet of things sub-equipment needs to bear a large amount of data communication services and the application environments are also very different, many internet of things sub-equipment often encounter the phenomenon of unexpected crash due to problems of programs in work and need to be reset frequently. Meanwhile, the terminal of the internet of things needs to update the original system from time to upgrade the system. The resetting of the internet of things sub-equipment and the stability and efficiency of the upgrading of the internet of things terminal system seriously affect the working state stability and efficiency of the whole system, so how to realize the stable and efficient resetting of the internet of things sub-equipment and the upgrading (OTA) of the terminal remote system is a problem that each internet of things project needs to be solved vigorously.
Disclosure of Invention
The invention aims to provide a circuit for realizing the functions of upgrading interface management and mutual resetting of a Raisaka MCU and an Internet of things sub-device.
In order to achieve the above object, the technical solution of the present invention is to provide an upgrade interface management and mutual RESET support circuit for an end controller and an internet of things sub-device based on a rassa RL78 series MCU, the MCU has a rassa RL78 series MCU chip having a VDD _5V pin, a tol 0 pin, a RESET pin, a TX pin, an RX pin, and a GND pin, the internet of things sub-device has a power supply port 5V _ B, I/O port one I/O _1, an I/O port two I/O _2, a serial communication line receiving port RX, a serial communication line transmitting port TX, and a ground port GND, the TX pin of the rassa RL78 series MCU chip is electrically connected to the serial communication line receiving port RX of the internet of things sub-device, the RX pin of the rassa RL78 series MCU chip is electrically connected to the GND communication line transmitting port TX of the serial communication line of the internet of things sub-device, the GND pin of the rassa 78 series MCU chip is electrically connected to the ground port of the internet of things sub-device, the upgrade interface management and mutual reset support circuit comprises:
the PMOS tube V1 is electrically connected between a VDD _5V pin of the Ruisarl 78 series MCU chip and a power supply port 5V _ B of the Internet of things sub-equipment, the PMOS tube V1 is controlled by a PMOS tube switch control network, and the PMOS tube switch control network comprises a PMOS tube cut-off network and a PMOS tube conduction and maintenance network; the power supply voltage output by the VDD _5V pin of the RysaRL 78 series MCU chip is supplied to a power supply port 5V _ B of the object connection sub-equipment through a conducted PMOS tube V1; when the TOOL0 pin of the Ryssa RL78 series MCU chip outputs low level, the state of the PMOS tube V1 is switched from on to off by the PMOS tube cut-off network, so that the power supply port 5V _ B of the Internet of things sub-equipment is powered off; when an I/O port I/O _1 of the thing connection sub-equipment outputs a low level signal to a TOOL0 pin of an MCU chip of the Rysa RL78 series, a PMOS tube conduction and maintenance network enables a PMOS tube V1 to be always kept in a conduction state;
the isolation diode D20 is electrically connected between the TOOL0 pin of the RysaRL 78 series MCU chip and the I/O port I/O _1 of the object linking sub-device, the anode of the isolation diode D20 is connected with the TOOL0 pin of the RysaRL 78 series MCU chip, and the cathode is connected with the I/O port I/O _1 of the object linking sub-device;
the NMOS tube V2 is electrically connected between a RESET pin of the Ruisarl 78 series MCU chip and the second I/O _2 of the I/O port of the Internet of things sub-equipment, and the NMOS tube V2 is controlled by an NMOS tube switch control network; when the physical connection sub-equipment works normally, the NMOS tube V2 is in a conducting state, and the physical connection sub-equipment can send a RESET signal to a RESET pin of a Ruisarl 78 series MCU chip through an I/O port II I/O _ 2; when the power supply port 5V _ B of the equipment of the Internet of things loses power, the state of the NMOS tube V2 is switched from on to off by the NMOS tube switch control network.
Preferably, the source of the PMOS transistor V1 is connected to the VDD _5V pin of the rassa RL78 series MCU chip, and the drain is connected to the power supply port 5V _ B of the electronic device.
Preferably, the PMOS transistor cut-off network comprises a resistor R11, a resistor R10, a resistor R12 and a triode V10, wherein the base of the triode V10 is connected with one end of a resistor R11, and the other end of the resistor R11 is connected with a tol 0 pin of a lissah RL78 series MCU chip; the collector of the triode V10 is connected with one ends of a resistor R10 and a resistor R12, the other end of the resistor R10 is connected with the source electrode of a PMOS tube V1, and the other end of the resistor R12 is connected with the grid electrode of a PMOS tube V1; the emitter set of transistor V10 is connected to ground.
Preferably, the PMOS transistor on-hold network includes a transistor V20, a resistor R20, a resistor R21, a capacitor C20, and a capacitor C10, a collector of the transistor V20 is connected to a gate of the PMOS transistor V1 and one end of the capacitor C20, the other end of the capacitor C20 is connected to a drain of the PMOS transistor V1, and the drain of the PMOS transistor V1 is further grounded via the capacitor C10; the emission set of the triode V20 is connected with an I/O port I/O _1 of the Internet of things sub-device; a resistor R21 is connected across the emitter and base of transistor V20.
Preferably, the drain of the NMOS tube V2 is connected with a RESET pin of a Ralsa RL78 series MCU chip, and the source is connected with an I/O port II I/O _2 of the object linking sub-device.
Preferably, the NMOS transistor switch control network includes a resistor R30, a transistor V30, a resistor R31, a resistor R32, a capacitor C30, a transistor V31, and a resistor R33, an emitter of the transistor V30 is connected to one end of the resistor R30, and the other end of the resistor R30 is connected to a RESET pin of a lissarl 78 series MCU chip; the base electrode of the triode V30 is connected with one end of the resistor R31, and the other end of the resistor R31 is connected with a power supply port 5V _ B of the Internet of things sub-equipment; the collector of the triode V30 is connected with the base of the triode V31 through a resistor R33; the emitter of the triode V31 is grounded; the collector of the triode V31 is connected with the gate of the NMOS transistor V2, one end of the capacitor C30 and one end of the resistor R32, the other end of the capacitor C30 is grounded, and the other end of the resistor R32 is connected with the power supply port 5V _ B of the Internet of things sub-device.
The invention realizes that only the RysaRL 78 series MCU chip is originally used for adding a control network to a program upgrading interface of the MCU to reset the Internet of things sub-equipment, and simultaneously, the RysaRL 78 series chip can be reset and OTA upgraded by the Internet of things sub-system. Compared with the prior art, the invention completes the functions of upgrading interface management and mutual reset for the Ryssa MCU and the Internet of things sub-equipment under the condition of not increasing other pins of the Ryssa RL78 series MCU chip and only using the pins necessary for 6 burning programs.
Drawings
Fig. 1 is an electrical schematic diagram of an upgrade interface management and mutual reset supporting circuit for an MCU and an internet of things subset disclosed in this embodiment;
fig. 2 is a timing diagram of upgrade of an MCU chip of rassa RL78 series.
Detailed Description
The invention is further illustrated by the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
The invention provides an upgrade interface management and mutual reset supporting circuit for an MCU and an Internet of things sub-device, which is connected between 6 pins related to a burning program in all pins of an MCU chip of a Ruisarl 78 series and the Internet of things sub-device. Referring to a data manual DataShet, 6 pins related to a burning program in all pins of a Ruisarl 78 series MCU chip are a VDD _5V pin, a TOOL0 pin, a RESET pin, a TX pin, an RX pin and a GND pin respectively. The 6 pins of the Ryssa RL78 series MCU chip are connected with a power supply port 5V _ B, I/O port I/O _1, an I/O port II I/O _2, a serial communication line receiving port RX, a serial communication line transmitting port TX and a ground port GND of the Internet of things sub-equipment through the circuit provided by the invention.
The TX pin of the Ryssa RL78 series MCU chip is directly and electrically connected with a serial port communication line receiving port RX of the object connection sub-equipment, the RX pin of the Ryssa RL78 series MCU chip is directly and electrically connected with a serial port communication line transmitting port TX of the object connection sub-equipment, and the GND pin of the Ryssa RL78 series MCU chip is directly and electrically connected with a grounding port GND of the object connection sub-equipment.
A PMOS tube V1 is electrically connected between a VDD _5V pin of the Ruisarl 78 series MCU chip and a power supply port 5V _ B of the Internet of things sub-equipment, the PMOS tube V1 is controlled by a PMOS tube switch control network, and the PMOS tube switch control network further comprises a PMOS tube cut-off network and a PMOS tube conduction and maintenance network. The power supply voltage output by the VDD _5V pin of the Ralssa RL78 series MCU chip is supplied to the power supply port 5V _ B of the object sub-equipment through the conducted PMOS tube V1. When the TOOL0 pin of the RysaRL 78 series MCU chip outputs low level, the state of the PMOS tube V1 is switched from on to off by the PMOS tube cut-off network, so that the power supply port 5V _ B of the Internet of things sub-equipment is powered off. When an I/O port I/O _1 of the Ionic sub-device outputs a low-level signal to a TOOL0 pin of an MCU chip of the RysaRL 78 series, the PMOS tube V1 is always kept in a conducting state by the PMOS tube conducting and maintaining network.
In this embodiment, the source of the PMOS transistor V1 is connected to the VDD _5V pin of the rassa RL78 MCU chip, and the drain is connected to the power supply port 5V _ B of the physical sub-device.
The PMOS tube cut-off network consists of a resistor R11, a resistor R10, a resistor R12 and a triode V10, and the connection relationship is described as follows: the base electrode of the triode V10 is connected with one end of a resistor R11, and the other end of the resistor R11 is connected with a TOOL0 pin of a Ralssa RL78 series MCU chip; the collector of the triode V10 is connected with one ends of a resistor R10 and a resistor R12, the other end of the resistor R10 is connected with the source electrode of a PMOS tube V1, and the other end of the resistor R12 is connected with the grid electrode of a PMOS tube V1; the emitter set of transistor V10 is connected to ground.
The PMOS tube conduction and holding network consists of a triode V20, a resistor R20, a resistor R21, a capacitor C20 and a capacitor C10, and the connection relationship is described as follows: the collector of the triode V20 is connected with the grid of the PMOS tube V1 and one end of the capacitor C20, the other end of the capacitor C20 is connected with the drain of the PMOS tube V1, and the drain of the PMOS tube V1 is grounded through the capacitor C10; the emission set of the triode V20 is connected with an I/O port I/O _1 of the Internet of things sub-device; a resistor R21 is connected across the emitter and base of transistor V20.
An isolation diode D20 is electrically connected between the TOOL0 pin of the RysaRL 78 series MCU chip and the I/O port I/O _1 of the object linking sub-device, wherein the anode of the isolation diode D20 is connected with the TOOL0 pin of the RysaRL 78 series MCU chip, and the cathode is connected with the I/O port I/O _1 of the object linking sub-device.
An NMOS tube V2 is electrically connected between a RESET pin of the Ruisarl 78 series MCU chip and the I/O port II I/O _2 of the physical connection sub-equipment, and the NMOS tube V2 is controlled by an NMOS tube switch control network. The drain electrode of the NMOS tube V2 is connected with a RESET pin of a Ralsa RL78 series MCU chip, and the source electrode is connected with an I/O port II I/O _2 of the object linking sub-device. When the physical connection sub-equipment works normally, the NMOS tube V2 is in a conducting state, and the physical connection sub-equipment can send a RESET signal to a RESET pin of a Ralsa RL78 series MCU chip through an I/O port II I/O _ 2. When the power supply port 5V _ B of the equipment of the Internet of things loses power, the state of the NMOS tube V2 is switched from on to off by the NMOS tube switch control network.
In this embodiment, the NMOS switch control network is composed of a resistor R30, a transistor V30, a resistor R31, a resistor R32, a capacitor C30, a transistor V31, and a resistor R33, and the connection relationship is described as follows: an emitter of the triode V30 is connected with one end of the resistor R30, and the other end of the resistor R30 is connected with a RESET pin of a Ralssa RL78 series MCU chip; the base electrode of the triode V30 is connected with one end of the resistor R31, and the other end of the resistor R31 is connected with a power supply port 5V _ B of the Internet of things sub-equipment; the collector of the triode V30 is connected with the base of the triode V31 through a resistor R33; the emitter of the triode V31 is grounded; the collector of the triode V31 is connected with the gate of the NMOS transistor V2, one end of the capacitor C30 and one end of the resistor R32, the other end of the capacitor C30 is grounded, and the other end of the resistor R32 is connected with the power supply port 5V _ B of the Internet of things sub-device.
(1) Resetting the Internet of things sub-equipment by the RysaRL 78 series MCU chip:
when the rassa RL78 series MCU chips do not receive the heartbeat packet sent by the Internet of things sub-device for three minutes, the operation of the Internet of things sub-device is abnormal, and the rassa RL78 series MCU chips need to reset the Internet of things sub-device. The reset operation is completed by powering on the power supply port 5V _ B of the internet of things subset again after powering off for 3 seconds, and the process is specifically described as follows:
the TOOL0 pin of the RysaRL 78 series MCU chip is changed from an input state to an output state, and 3-second low level is output, and at the moment, the PMOS tube cut-off network cuts off the PMOS tube V1. Since the power supply port 5V _ B of the physical sub-device is supplied by the VDD _5V pin of the MCU chip of the Ruisarl 78 series through the PMOS tube V1, in the 3 seconds, the PMOS tube V1 is cut off, which is equivalent to that the physical sub-device is powered off for 3 seconds. Meanwhile, the power supply of the power supply port 5V _ B of the physical connection sub-equipment to the NMOS tube switch control network disappears, and the NMOS tube switch control network also enables the NMOS tube V2 to be cut off, so that the error resetting of the I/O port II I/O _2 of the physical connection sub-equipment to the Ryssa RL78 series MCU chips caused by the power failure of the physical connection sub-equipment is prevented. And after the RysaRL 78 series MCU chip cuts off the power supply to the Internet of things sub-equipment for 3 seconds, the power supply is supplied to the Internet of things sub-equipment again, so that the resetting of the Internet of things sub-equipment is realized.
(2) Resetting the Rysa RL78 series MCU chip by the Internet of things sub-equipment:
when the internet of things sub-equipment cannot receive the acquisition signals or feedback information of the rassa RL78 series MCU chips, the rassa RL78 series MCU chips are abnormal in work, and the rassa RL78 series MCU chips need to be reset by the internet of things sub-equipment. At this time, the internet of things subset only needs to send a RESET signal to the RESET pin of the rassa RL78 series MCU chip through the I/O port ii I/O _ 2. After the RESET pin of the Ruisarl 78 series MCU chip receives the RESET signal, the RESET of the MCU can be realized.
(3) The cloud server performs OTA upgrade on the Rysa RL78 series MCU chips through the Internet of things sub-equipment:
the timing sequence specified in fig. 2 must be satisfied when upgrading the rassa RL78 series MCU chip, and it can be seen from the timing diagram shown in fig. 2 that: in the upgrading process, under the condition of keeping power supply of the Ralsa RL78 series MCU chip, the Internet of things sub-device needs to set the level of the RESET pin and the TOOL0 pin of the Ralsa RL78 series MCU chip from low to high respectively through an I/O port II I/O _2 and an I/O port I/O _ 1. Since these processes are all performed by the internet of things subset, the internet of things subset needs to be kept in an operating state all the time during the period, that is, normal power supply to the power supply port 5V _ B of the internet of things subset is maintained. Therefore, in order to prevent the abnormal power supply of the power supply port 5V _ B of the internet of things subset caused by the fact that the PMOS transistor V1 is cut off by the PMOS transistor cut-off network when the I/O port I/O _1 of the internet of things subset is set to be low level to the tol 0 pin of the rasa RL78 series MCU chip, the PMOS transistor conduction maintaining network is added to keep the PMOS transistor V1 in a conducting state all the time, that is, the power supply of the power supply port 5V _ B exists all the time. Meanwhile, due to the fact that power supply of the power supply port 5V _ B always exists, the NMOS tube V2 is always kept in a conducting state, and the fact that the change level from low to high is normally applied to the RESET pin of the Raisarl 78 series MCU chip through the I/O port II I/O _2 is guaranteed, therefore, the fact that the Internet of things sub-device can transmit the upgrading program obtained from the cloud server to the Raisarl 78 series MCU chip through the serial communication line receiving port RX and the serial communication line sending port TX is guaranteed, and OTA upgrading work is completed.

Claims (6)

1. An upgrade interface management and mutual reset support circuit for an MCU and an IOT sub-device, the MCU adopts a Ruisarl 78 series MCU chip with a VDD-5V pin, a TOOL0 pin, a RESET pin, a TX pin, an RX pin and a GND pin, the Internet of things sub-device is provided with a power supply port 5V _ B, I/O port I/O _1, an I/O port II I/O _2, a serial communication line receiving port RX, a serial communication line transmitting port TX and a ground port GND, a TX pin of a RysaRL 78 series MCU chip is directly and electrically connected with the serial communication line receiving port RX of the Internet of things sub-device, an RX pin of the RysaRL 78 series MCU chip is directly and electrically connected with the serial communication line transmitting port TX of the Internet of things sub-device, and a GND pin of the RysaRL 78 series MCU chip is directly and electrically connected with the ground port GND of the Internet of things sub-device, and the upgrading interface management and mutual reset supporting circuit is characterized by comprising:
the PMOS tube V1 is electrically connected between a VDD _5V pin of the Ruisarl 78 series MCU chip and a power supply port 5V _ B of the Internet of things sub-equipment, the PMOS tube V1 is controlled by a PMOS tube switch control network, and the PMOS tube switch control network comprises a PMOS tube cut-off network and a PMOS tube conduction and maintenance network; the power supply voltage output by the VDD _5V pin of the RysaRL 78 series MCU chip is supplied to a power supply port 5V _ B of the object connection sub-equipment through a conducted PMOS tube V1; when the TOOL0 pin of the Ryssa RL78 series MCU chip outputs low level, the state of the PMOS tube V1 is switched from on to off by the PMOS tube cut-off network, so that the power supply port 5V _ B of the Internet of things sub-equipment is powered off; when an I/O port I/O _1 of the thing connection sub-equipment outputs a low level signal to a TOOL0 pin of an MCU chip of the Rysa RL78 series, a PMOS tube conduction and maintenance network enables a PMOS tube V1 to be always kept in a conduction state;
the isolation diode D20 is electrically connected between the TOOL0 pin of the RysaRL 78 series MCU chip and the I/O port I/O _1 of the object linking sub-device, the anode of the isolation diode D20 is connected with the TOOL0 pin of the RysaRL 78 series MCU chip, and the cathode is connected with the I/O port I/O _1 of the object linking sub-device;
the NMOS tube V2 is electrically connected between a RESET pin of the Ruisarl 78 series MCU chip and the second I/O _2 of the I/O port of the Internet of things sub-equipment, and the NMOS tube V2 is controlled by an NMOS tube switch control network; when the physical connection sub-equipment works normally, the NMOS tube V2 is in a conducting state, and the physical connection sub-equipment can send a RESET signal to a RESET pin of a Ruisarl 78 series MCU chip through an I/O port II I/O _ 2; when the power supply port 5V _ B of the equipment of the Internet of things loses power, the state of the NMOS tube V2 is switched from on to off by the NMOS tube switch control network.
2. The upgrade interface management and mutual reset support circuit for the MCU and the internet of things subset according to claim 1, wherein the source of the PMOS transistor V1 is connected to VDD _5V pin of the rassa RL78 series MCU chip, and the drain is connected to the power supply port 5V _ B of the internet of things subset.
3. The upgrade interface management and mutual reset support circuit for the MCU and the internet of things subset according to claim 2, wherein the PMOS transistor cut-off network comprises a resistor R11, a resistor R10, a resistor R12 and a transistor V10, wherein the base of the transistor V10 is connected to one end of a resistor R11, and the other end of the resistor R11 is connected to the tol 0 pin of the rusa RL78 series MCU chip; the collector of the triode V10 is connected with one ends of a resistor R10 and a resistor R12, the other end of the resistor R10 is connected with the source electrode of a PMOS tube V1, and the other end of the resistor R12 is connected with the grid electrode of a PMOS tube V1; the emitter set of transistor V10 is connected to ground.
4. The upgrade interface management and mutual reset support circuit for the MCU and the internet of things subset according to claim 3, wherein the PMOS transistor on-hold network comprises a transistor V20, a resistor R20, a resistor R21, a capacitor C20 and a capacitor C10, wherein a collector of the transistor V20 is connected to a gate of a PMOS transistor V1 and one end of the capacitor C20, the other end of the capacitor C20 is connected to a drain of a PMOS transistor V1, and a drain of the PMOS transistor V1 is further grounded via a capacitor C10; the emission set of the triode V20 is connected with an I/O port I/O _1 of the Internet of things sub-device; a resistor R21 is connected across the emitter and base of transistor V20.
5. The upgrade interface management and mutual RESET support circuit for the MCU and the internet of things subset according to claim 1, wherein the drain of the NMOS transistor V2 is connected to the RESET pin of the rassa RL78 series MCU chip, and the source is connected to the I/O port two I/O _2 of the internet of things subset.
6. The upgrade interface management and mutual RESET support circuit for the MCU and the internet of things subset according to claim 5, wherein the NMOS switching control network comprises a resistor R30, a transistor V30, a resistor R31, a resistor R32, a capacitor C30, a transistor V31, and a resistor R33, an emitter of the transistor V30 is connected to one end of the resistor R30, and the other end of the resistor R30 is connected to a RESET pin of an MCU chip of the sariral 78 series; the base electrode of the triode V30 is connected with one end of the resistor R31, and the other end of the resistor R31 is connected with a power supply port 5V _ B of the Internet of things sub-equipment; the collector of the triode V30 is connected with the base of the triode V31 through a resistor R33; the emitter of the triode V31 is grounded; the collector of the triode V31 is connected with the gate of the NMOS transistor V2, one end of the capacitor C30 and one end of the resistor R32, the other end of the capacitor C30 is grounded, and the other end of the resistor R32 is connected with the power supply port 5V _ B of the Internet of things sub-device.
CN202111224214.3A 2021-10-20 2021-10-20 Upgrading interface management and mutual reset supporting circuit for MCU and IOT sub-equipment Pending CN113986262A (en)

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CN202111224214.3A CN113986262A (en) 2021-10-20 2021-10-20 Upgrading interface management and mutual reset supporting circuit for MCU and IOT sub-equipment

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CN113986262A true CN113986262A (en) 2022-01-28

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