CN115940345A - Power management integrated circuit, micro control unit and vehicle body central controller - Google Patents
Power management integrated circuit, micro control unit and vehicle body central controller Download PDFInfo
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- CN115940345A CN115940345A CN202211572880.0A CN202211572880A CN115940345A CN 115940345 A CN115940345 A CN 115940345A CN 202211572880 A CN202211572880 A CN 202211572880A CN 115940345 A CN115940345 A CN 115940345A
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Abstract
The application discloses a power management integrated circuit, a micro control unit and a vehicle body central controller, the vehicle body central controller comprises a power management integrated circuit and the micro control unit, the power management integrated circuit is connected with the micro control unit, the power management integrated circuit is used for carrying out voltage conversion on the power supply voltage of the whole vehicle to obtain a target voltage, the micro control unit is powered based on the target voltage, when the power supply voltage of the whole vehicle is determined to be normal, a state switching signal is sent to the micro control unit in response to a dog feeding signal sent by the micro control unit, the state switching signal is used for indicating the micro control unit to be switched from a standby mode to a normal mode, and therefore after the micro control unit is powered based on the target voltage, the state switching signal can be sent to the micro control unit to indicate the micro control unit to be switched from the standby mode to the normal working mode, awakening of the micro control unit is achieved, the micro control unit in the normal working mode can be powered on for the whole vehicle normally, and normal operation of the whole vehicle is maintained.
Description
Technical Field
The application relates to the field of vehicles, in particular to a power management integrated circuit, a micro control unit and a vehicle body central controller.
Background
With the development of automobiles, at present, "electromotion, intellectualization, networking and sharing" becomes the mainstream trend of future development of the global automobile industry, and becomes a new place of great change in the automobile industry for hundreds of years, and the micro control unit drives into the blue sea market of the automobiles. The Central controller of the vehicle body, also called a Central Electronic Module (CEM), is a domain controller based on a micro control unit, is a core component of a low-voltage power supply system, can supply power to other functional components inside the vehicle, and plays a significant role in realizing various intelligent functions of the whole vehicle.
The vehicle body central controller comprises a Micro Controller Unit (MCU) and a Power Management integrated circuit (Power Management IC, PMIC), and the micro controller Unit has two working modes: standby (standby) and normal operation (normal) modes, so that the central controller of the vehicle body works in the standby mode and the normal operation mode. The storage battery in the automobile can supply power for the central controller of the automobile body, the power management integrated circuit can convert the voltage of the storage battery into low voltage suitable for the micro control unit, and the micro control unit can provide low voltage for other functional parts in a normal working mode.
Under the condition that the negative electrode of the storage battery is loose, the conducting wire and the negative electrode pole of the storage battery are poor in contact due to dust, foreign matters, loose installation and the like or metal oxidation and the like, so that the power supply voltage provided by the power management integrated circuit for the vehicle body central controller is insufficient, the vehicle body central controller cannot be switched from a standby mode to a normal working mode, the whole vehicle cannot be electrified, and the normal operation of the whole vehicle is influenced.
At present, even if the power supply voltage of a storage battery returns to normal, the central controller of the vehicle body cannot be switched from a standby mode to a normal operation mode.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a power management integrated circuit and a vehicle body central controller, which solve the problem that the vehicle body central controller cannot be switched from a standby mode to a normal operating mode.
The specific scheme is as follows:
in a first aspect, the present application provides a power management integrated circuit, connected to a micro control unit, configured to:
voltage conversion is carried out on the power supply voltage of the whole vehicle to obtain a target voltage, and power is supplied to the micro control unit based on the target voltage;
when the power supply voltage of the whole vehicle is determined to be normal, responding to a dog feeding signal sent by the micro control unit, and sending a state switching signal to the micro control unit, wherein the state switching signal is used for indicating the micro control unit to be switched from a standby mode to a normal working mode; when the power supply voltage of the whole vehicle is normal, the target voltage reaches a preset voltage.
Optionally, the power management integrated circuit is further configured to:
and in a preset time period after the fact that the power supply voltage of the whole vehicle is switched from the abnormal state to the normal state is determined, if the dog feeding signal from the micro control unit is not acquired, the state switching signal is sent to the micro control unit.
Optionally, the power management integrated circuit is further configured to:
when the power supply voltage of the whole vehicle is maintained within a normal range for a preset time, determining that the power supply voltage of the whole vehicle is normal;
when the power supply voltage of the whole vehicle is not in a normal range or the maintaining time length in the normal range is less than the preset time length, determining that the power supply voltage of the whole vehicle is abnormal;
after the fact that the power supply voltage of the whole vehicle is abnormal is determined, if the power supply voltage of the whole vehicle is maintained within a normal range for a preset time, the fact that the power supply voltage of the whole vehicle is switched from abnormal to normal is determined.
Optionally, the state switching signal includes a bit reset signal, where the bit reset signal is used to instruct the micro control unit to restart, so that the micro control unit is switched from a standby mode to a normal operating mode after being restarted.
Optionally, the state switching signal includes a flag bit clearing signal, and the flag bit clearing signal is used to instruct the micro control unit to clear the first flag bit corresponding to the standby mode, so that the micro control unit is switched from the standby mode to the normal operating mode.
Optionally, the power management integrated circuit obtains the dog feeding signal from the micro control unit through a serial peripheral interface bus.
In a second aspect, an embodiment of the present application further provides a micro control unit, connected to a power management integrated circuit, where the power management integrated circuit is configured to provide a target voltage for the micro control unit, and the micro control unit is configured to:
when a switching instruction is acquired, if the target voltage is smaller than a preset voltage, waiting for the target voltage to reach the preset voltage;
if the target voltage reaches the preset voltage, sending a dog feeding signal to the power management integrated circuit according to the switching instruction in a standby mode;
and switching from a standby mode to a normal working mode according to a state switching signal returned by the power management integrated circuit.
Optionally, the state switching signal includes a bit reset signal, where the bit reset signal is used to instruct the micro control unit to restart, so that the micro control unit is switched from a standby mode to a normal operating mode after being restarted.
Optionally, the state switching signal includes a flag clearing signal, where the flag clearing signal is used to instruct the micro control unit to clear the first flag corresponding to the standby mode, so that the micro control unit is switched from the standby mode to the normal operating mode.
In a third aspect, an embodiment of the present application further provides a vehicle body central controller, which includes the power management integrated circuit and the micro control unit.
The embodiment of the application provides a power management integrated circuit, a micro control unit and a vehicle body central controller, wherein the vehicle body central controller comprises the power management integrated circuit and the micro control unit, the power management integrated circuit is connected with the micro control unit, the power management integrated circuit is used for carrying out voltage conversion on the power supply voltage of a whole vehicle to obtain a target voltage, and supplying power to the micro control unit based on the target voltage, when the power supply voltage of the whole vehicle is determined to be switched from abnormal to normal, a state switching signal is sent to the micro control unit in response to a dog feeding signal sent by the micro control unit, and the state switching signal is used for indicating the micro control unit to be switched from a standby mode to a normal mode.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a vehicle body central controller provided by an embodiment of the application;
FIG. 2 is a schematic diagram illustrating an interaction between a power management integrated circuit and a micro control unit according to an embodiment of the present application;
fig. 3 is a schematic diagram illustrating an interaction between another power management integrated circuit and a micro control unit according to an embodiment of the present application.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, but the present application may be practiced in other ways than those described herein, and it will be appreciated by those skilled in the art that the present application may be practiced without departing from the spirit and scope of the present application, and that the present application is not limited to the specific embodiments disclosed below.
As described in the background, the mcu may provide low voltage to other functional components in the normal operating mode to power up the entire vehicle, which requires the mcu to switch from the standby mode to the normal operating mode when it is necessary to power up the entire vehicle. Under the condition that the cathode of the storage battery is loose, the storage battery provides insufficient power supply voltage for the power management integrated circuit (referred to as the whole vehicle power supply voltage for short), so that the power supply voltage provided by the power management integrated circuit for the micro control unit is insufficient, the micro control unit cannot be switched from the standby mode to the normal working mode, the whole vehicle cannot be powered on, and the normal operation of the whole vehicle is influenced.
At present, after the power supply voltage of the whole vehicle is recovered to be normal, the power supply voltage provided by the power management integrated circuit for the micro control unit is recovered correspondingly, and normally, the control unit can be automatically switched from a standby mode to a normal working mode.
Based on the above technical problem, an embodiment of the present application provides a power management integrated circuit, a micro control unit and a central controller of a vehicle body, wherein the central controller of the vehicle body includes the power management integrated circuit and the micro control unit, the power management integrated circuit is connected with the micro control unit, the power management integrated circuit is configured to perform voltage conversion on a power supply voltage of the entire vehicle to obtain a target voltage, and supply power to the micro control unit based on the target voltage, and when it is determined that the power supply voltage of the entire vehicle is normal, a state switching signal is sent to the micro control unit in response to a dog feeding signal sent from the micro control unit, and the state switching signal is used to instruct the micro control unit to switch from a standby mode to a normal mode.
For the convenience of understanding, a power management integrated circuit, a micro control unit and a body central controller provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.
Referring to fig. 1, a schematic structural diagram of a vehicle body central Controller (CEM) provided in an embodiment of the present invention is shown, where the vehicle body central Controller (CEM) includes a Micro Control Unit (MCU) 10 and a Power Management Integrated Circuit (PMIC) 20, and the vehicle body central controller is a core component of a low-voltage power supply system, and may supply power to other functional components inside an automobile, so as to implement power-on of the entire automobile.
The power management integrated circuit 20 may perform voltage conversion on a power supply voltage of the storage battery (hereinafter, referred to as a vehicle power supply voltage) to obtain a target voltage, and supply power to the micro control unit based on the target voltage. The voltage of the whole vehicle power supply is usually a fixed value, and the voltage range is 9-16V, for example 12V. Under the condition that the negative electrode of the storage battery is loose, the power supply voltage of the whole vehicle is lower, for example, lower than 6V, and the target voltage converted by the corresponding power management integrated circuit 20 is also lower, for example, lower than 3.3V, that is, the target voltage provided by the power management integrated circuit 20 for the micro control unit 10 is lower.
There are two modes of operation of the micro control unit 10: standby (standby) and normal operation (normal) modes, so that the central controller of the vehicle body works in the standby mode and the normal operation mode. In the standby mode of the micro control unit 10, only part of the functional components operate normally, which may also be referred to as a corelet mode; accordingly, in the normal operation mode of the mcu 10, most of the functional components are operating normally, which may also be referred to as big core mode. In the standby mode, the micro control unit 10 cannot power on the entire vehicle, and in the normal operating mode, the entire vehicle can be powered on, so that when the entire vehicle needs to be powered on, the micro control unit 10 needs to be switched from the standby mode to the normal operating mode.
The micro control unit 10 cannot be switched from the standby mode to the normal operation mode at a lower supply voltage, because the lower supply voltage is not sufficient to support the power consumption in the normal operation mode. Therefore, when the power management integrated circuit 20 is required to provide a normal voltage, the mcu 10 switches from the standby mode to the normal operating mode, but in actual operation, the mcu 10 cannot switch to the standby mode when it receives a switching command at a low power supply voltage, and the mcu 10 cannot automatically switch from the standby mode to the normal operating mode when the power supply voltage of the mcu 10 is normal. The switching instruction may be sent to the micro control unit 10 by another component, or may be generated by the micro control unit 10 according to a signal sent by another component, where the switching instruction is used to wake up the central controller of the vehicle body, so that the central controller of the vehicle body performs mode switching.
In this embodiment, when the micro control unit 10 obtains the switching instruction, it indicates that the micro control unit 10 needs to perform mode switching, and at this time, if the power supply voltage (i.e., the target voltage provided by the power management integrated circuit) of the micro control unit 10 is lower, for example, smaller than a preset voltage, the mode switching condition is not met, and it may wait for the power supply voltage to recover to normal, i.e., wait for the target voltage to reach the preset voltage. When the power supply voltage of the mcu 10 returns to normal, the mcu 10 can automatically switch from the standby mode to the normal operating mode according to the switching command. Correspondingly, when the power supply voltage of the micro control unit 10 is normal, it indicates that the power supply voltage of the entire vehicle is also recovered to be normal, the power management integrated circuit 20 performs voltage conversion and provides the voltage of the micro control unit 10 based on the normal power supply voltage of the entire vehicle, that is, when the power supply voltage of the entire vehicle is normal, the target voltage reaches the preset voltage.
If the power supply voltage of the mcu 10 returns to normal and is not switched from the standby mode to the normal operating mode, a dog feeding signal may be sent to the power control ic 20 according to the switching command in the standby mode, which indicates that the mcu 10 needs to switch modes and has a mode switching condition, but does not complete the mode switching. The power management integrated circuit 20 may send a state switching signal to the micro control unit 10 in response to the dog feeding signal of the micro control unit 10, and instruct the micro control unit 10 to switch from the standby mode to the normal operating mode through the state switching signal, so as to wake up the outside of the micro control unit 10, and further enable the whole vehicle to be powered up normally. After acquiring the state switching signal returned by the power management integrated circuit 20, the micro control unit 10 may switch from the standby mode to the normal operating mode according to the state switching signal.
The micro control unit 10 and the power control integrated circuit 20 may communicate with each other through a Serial Peripheral Interface (SPI) bus, which is a high-speed, full-duplex, and synchronous communication bus, and occupies only four wires on the pins of the chip, thereby saving the pins of the chip, and simultaneously saving space on the layout of the PCB and providing convenience. Little the control unit 10 can send the dog feeding signal to power control integrated circuit 20 through SPI, realizes the dog feeding to power control integrated circuit 20, and power control integrated circuit 20 can obtain the dog feeding signal that comes from little the control unit 10 through SPI, and is concrete, and little the control unit 10 control dog feeding passes through SPI and sends the dog feeding signal, and power control integrated circuit 20 control watchdog passes through SPI monitoring dog feeding signal.
As a possible implementation manner, the state switching signal may be a bit Reset (RSTB) signal, which is used to instruct the mcu to restart, so that the mcu 10 can switch from the standby mode to the normal operation mode after restarting. The bit reset signal is a low level signal of the RSTB pin until the mcu 10 exits the reset state, indicating that the mcu 10 has successfully restarted.
As another possible implementation manner, the state switching signal is a flag clearing signal for clearing a first flag of the micro control unit 10 corresponding to the standby mode, so that the micro control unit 10 switches from the standby mode to the normal operation mode. The mcu 10 has a first flag bit corresponding to the standby mode in the standby mode, and the microcontroller 10 can be forced to switch from the standby mode to the normal operating mode by clearing the first flag bit. The flag clearing signal may be used to instruct the micro control unit 10 to clear the first flag, or the first flag may be cleared directly by the level signal. When the mcu 10 is in the normal operating mode, it has the second flag bit corresponding to the normal operating mode and does not have the first flag bit corresponding to the standby mode.
In order to ensure that the micro control unit 10 has the switching condition, the power management integrated circuit 20 may further determine that the power supply voltage of the entire vehicle is normal before sending the state switching signal, that is, when determining that the power supply voltage of the entire vehicle is normal, send the state switching signal to the micro control unit 10 in response to a dog feeding signal sent from the micro control unit. In addition, in order to ensure that the micro control unit has a switching requirement, the power management integrated circuit 20 may determine that the switching instruction is acquired before sending the state switching signal, that is, after acquiring the switching instruction, the state switching signal is sent to the micro control unit 10 in response to a dog feeding signal sent from the micro control unit 10.
The micro control unit 10 may monitor the reliability of the target voltage provided by the power control integrated circuit 20 before sending a dog feeding signal to the power control integrated circuit 20. Specifically, whether the target voltage is maintained within a normal range for a preset time period or not can be determined, if yes, the target voltage is determined to be recovered to be normal, the dog feeding signal can be sent, and if not, the target voltage is determined not to be recovered to be normal, and the dog feeding signal is not sent.
Accordingly, the power control integrated circuit 20 may also monitor the reliability of the power supply voltage of the entire vehicle before sending the state switching signal. Specifically, whether the power supply voltage of the whole vehicle is maintained within a normal range for a preset time length can be determined, if yes, the power supply voltage of the whole vehicle is determined to be recovered to be normal, the state switching signal can be sent, and if not, the power supply voltage is determined not to be recovered to be normal, and the dog feeding signal is not sent. That is, the power control integrated circuit 20 may determine that the power supply voltage of the entire vehicle is normal when the power supply voltage of the entire vehicle is maintained within the normal range for a preset time duration; when the power supply voltage of the whole vehicle is not in a normal range or the maintaining time length in the normal range is less than the preset time length, determining that the power supply voltage of the whole vehicle is abnormal; after the power supply voltage of the whole vehicle is determined to be abnormal, if the power supply voltage of the whole vehicle is maintained within a normal range for a preset time, the power supply voltage of the whole vehicle is determined to be switched from abnormal to normal.
The preset duration used in the reliability monitoring of the micro control unit 10 and the power control integrated circuit 20 may be duration corresponding to multiple times of dog feeding, and if the duration of one time of dog feeding is the first duration, the preset duration may be a product of the number of dog feeding times and the first duration, for example, the number of dog feeding times is 5 times, and the first duration is 256ms, and the preset duration may be the duration of 5 times of dog feeding, and total 256 × 5=1280ms. Of course, the preset time period may also be other preset time periods.
Thus, the power control integrated circuit 20 may start monitoring of the dog feeding signal when it is determined that the power supply voltage of the entire vehicle is normal, and may send a state switching signal to the micro control unit if the dog feeding signal is monitored, and instruct the micro control unit 10 to switch from the standby mode to the normal operating mode through the state switching signal. Or, the power control integrated circuit 20 may start monitoring the dog feeding signal when it is determined that the power supply voltage of the entire vehicle is switched from abnormal to normal, and if the dog feeding signal is monitored, may send a state switching signal to the micro control unit 10 to instruct the micro control unit 10 to switch from the standby mode to the normal operating mode.
In addition, in a preset time period after the power control integrated circuit 20 determines that the power supply voltage of the entire vehicle is switched from the abnormal state to the normal state, if the dog feeding signal from the micro control unit 10 is not acquired, a state switching signal is sent to the micro control unit 10, and the micro control unit 10 is instructed to be switched from the standby mode to the normal operating mode by the state switching signal. Before sending the state switching signal, it may also be determined whether the micro control unit 10 is in the standby mode, if so, it is indicated that the micro control unit 10 fails to automatically switch the state and fails to send the dog feeding signal, at this time, the state switching signal may be sent to the micro control unit 10, the micro control unit 10 is instructed to switch from the standby mode to the normal operating mode by the state switching signal, if not, the state switching signal may not be sent, and since the state switching signal is used to instruct the micro control unit 10 to switch from the standby mode to the normal operating mode, even if the micro control unit 10 acquires the state switching signal in the normal operating mode, the function implementation of the micro control unit 10 is not affected. The state switching signal may be a bit reset signal or a flag bit clear signal.
Determining whether the mcu 10 is in the standby mode may be implemented by determining whether the mcu 10 has a first flag bit corresponding to the standby mode, wherein if the first flag bit corresponding to the standby mode is present, it indicates that the mcu 10 is in the standby mode, and if the first flag bit is absent, it indicates that the mcu 10 is not in the standby mode. It can also be implemented by determining whether the control unit 10 has a second flag bit corresponding to the normal operating mode, if the second flag bit corresponding to the normal operating mode is present, it indicates that the micro control unit 10 is in the normal operating mode but not in the standby mode, and if the second flag bit is absent, it indicates that the micro control unit 10 is not in the normal operating mode but in the standby mode.
The duration of the preset time period may be duration corresponding to multiple times of dog feeding, and if the duration of one time of dog feeding is the first duration, the duration of the preset time period may be a product of the number of dog feeding times and the first duration, for example, the number of dog feeding times is 5 times, and the first duration is 256ms, the duration of the preset time period may be duration of 5 times of dog feeding, and 256 × 5=1280ms is total. Of course, the duration of the preset time period may also be other preset durations.
Referring to fig. 2, for an interaction schematic diagram between a power management integrated circuit and a micro control unit provided in this embodiment of the present application, the micro control unit 10 determines that a target voltage maintains a preset duration within a normal range, determines that the target voltage is normal, and may send a dog feeding signal to the power control integrated circuit 20, the power control integrated circuit 20 determines that a whole vehicle power supply voltage maintains the preset duration within the normal range, and then determines that the micro control unit 10 has a switching condition, and may send a state switching signal to the micro control unit 10 according to the dog feeding signal, and the micro control unit 10 may switch from a standby mode to a normal operating mode according to the state switching signal.
Referring to fig. 3, for another schematic interaction diagram between a power management integrated circuit and a micro control unit provided in this embodiment of the application, when the micro control unit 10 determines that a target voltage maintains a preset time duration within a normal range, it determines that the target voltage is normal, and may send a dog feeding signal or not send the dog feeding signal, when the power control integrated circuit 20 determines that a supply voltage of a whole vehicle maintains the preset time duration within the normal range, it determines that the micro control unit 10 has a switching condition, and may send a state switching signal to the micro control unit 10 when the dog feeding signal is not acquired within the predetermined time duration, and the micro control unit 10 may switch from a standby mode to a normal operating mode according to the state switching signal. The power control integrated circuit 20 does not acquire the dog feeding signal, which may be caused by the fact that the micro control unit 10 does not transmit the dog feeding signal, or may be caused by the fact that the dog feeding signal between the micro control unit 10 and the power control integrated circuit 20 is lost.
The embodiment of the application provides a power management integrated circuit, a micro control unit and a vehicle body central controller, wherein the vehicle body central controller comprises the power management integrated circuit and the micro control unit, the power management integrated circuit is connected with the micro control unit, the power management integrated circuit is used for carrying out voltage conversion on the power supply voltage of the whole vehicle to obtain a target voltage, and supplying power to the micro control unit based on the target voltage.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is merely a preferred embodiment of the present application and, although the present application has been described with reference to the preferred embodiments, it is not intended to limit the present application. Those skilled in the art can now make numerous possible variations and modifications to the disclosed embodiments, or modify equivalent embodiments, using the methods and techniques disclosed above, without departing from the scope of the claimed embodiments. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application are still within the protection scope of the technical solution of the present application without departing from the content of the technical solution of the present application.
Claims (10)
1. A power management integrated circuit, connected to a micro-control unit, for:
voltage conversion is carried out on the power supply voltage of the whole vehicle to obtain a target voltage, and power is supplied to the micro control unit based on the target voltage;
when the power supply voltage of the whole vehicle is determined to be normal, responding to a dog feeding signal sent by the micro control unit, and sending a state switching signal to the micro control unit, wherein the state switching signal is used for indicating the micro control unit to be switched from a standby mode to a normal working mode; when the power supply voltage of the whole vehicle is normal, the target voltage reaches a preset voltage.
2. The power management integrated circuit of claim 1, wherein the power management integrated circuit is further configured to:
and in a preset time period after the power supply voltage of the whole vehicle is determined to be switched from abnormal to normal, if a dog feeding signal from the micro control unit is not acquired, the state switching signal is sent to the micro control unit.
3. The power management integrated circuit of claim 2, wherein the power management integrated circuit is further configured to:
when the power supply voltage of the whole vehicle is maintained within a normal range for a preset time, determining that the power supply voltage of the whole vehicle is normal;
when the power supply voltage of the whole vehicle is not in a normal range or the maintaining time length in the normal range is less than the preset time length, determining that the power supply voltage of the whole vehicle is abnormal;
after the fact that the power supply voltage of the whole vehicle is abnormal is determined, if the power supply voltage of the whole vehicle is maintained within a normal range for a preset time, the fact that the power supply voltage of the whole vehicle is switched from abnormal to normal is determined.
4. The power management integrated circuit of any of claims 1-3, wherein the state switching signal comprises a bit reset signal, the bit reset signal being used to instruct the mcu to restart, so that the mcu can switch from the standby mode to the normal operating mode after restarting.
5. The power management integrated circuit of any of claims 1-3, wherein the state switching signal comprises a flag clear signal, the flag clear signal being used to instruct the micro-control unit to clear a first flag corresponding to the standby mode for switching the micro-control unit from the standby mode to the normal operating mode.
6. The power management integrated circuit of any one of claims 1-3, wherein the power management integrated circuit obtains the dog feeding signal from the micro control unit via a serial peripheral interface bus.
7. A micro-control unit connected to a power management integrated circuit for providing a target voltage to the micro-control unit, the micro-control unit being configured to:
when a switching instruction is acquired, if the target voltage is smaller than a preset voltage, waiting for the target voltage to reach the preset voltage;
if the target voltage reaches the preset voltage, sending a dog feeding signal to the power management integrated circuit according to the switching instruction in a standby mode;
and switching from a standby mode to a normal working mode according to a state switching signal returned by the power management integrated circuit.
8. The mcu of claim 7, wherein the state switching signal comprises a bit reset signal, the bit reset signal being configured to instruct the mcu to restart for switching the mcu from the standby mode to the normal operating mode after the restart.
9. The mcu of claim 7, wherein the state switching signal comprises a flag clearing signal, the flag clearing signal being used to instruct the mcu to clear the first flag corresponding to the standby mode so that the mcu can switch from the standby mode to the normal operation mode.
10. A body central controller comprising a power management integrated circuit as claimed in any one of claims 1 to 6 and a micro control unit as claimed in any one of claims 7 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211572880.0A CN115940345A (en) | 2022-12-08 | 2022-12-08 | Power management integrated circuit, micro control unit and vehicle body central controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211572880.0A CN115940345A (en) | 2022-12-08 | 2022-12-08 | Power management integrated circuit, micro control unit and vehicle body central controller |
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| Publication Number | Publication Date |
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| CN115940345A true CN115940345A (en) | 2023-04-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211572880.0A Pending CN115940345A (en) | 2022-12-08 | 2022-12-08 | Power management integrated circuit, micro control unit and vehicle body central controller |
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| Country | Link |
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| CN (1) | CN115940345A (en) |
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- 2022-12-08 CN CN202211572880.0A patent/CN115940345A/en active Pending
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