MCU wake-up circuit and vehicle-mounted navigation system

Abstract

According to the MCU wake-up circuit and the vehicle-mounted navigation system provided by the utility model, when the MCU wake-up circuit detects that the level of a wake-up signal is changed through a signal acquisition loop, the emitter electrode and the collector electrode of a second triode Q2 are conducted, and at the moment, the base electrode voltage of a first triode Q1 is changed; the level change caused by the base voltage is transmitted to the wake-up interface of the MCU through the collector of the first triode Q1, so that the input wake-up signal can be quickly responded only by using a plurality of triodes and resistors, and the wake-up function of the vehicle-mounted navigation system can be realized on the premise that the cost is hardly increased; and the requirements of light weight and low cost of the product are met.

Description

TECHNICAL FIELD

[0001] The utility model relates to circuit design technical field especially, it is MCU awakening circuit and vehicle navigation system of a kind of. BACKGROUND

[0002] Vehicle navigation MCU (Microcontroller Unit, microcontroller unit) is the core component of vehicle navigation system, responsible for controlling the navigation system of vehicle, in complex automobile internal environment, need to ensure that MCU can stably and reliably run. In many applications, such MCU needs to be quickly awakened from sleep state to respond to external events or signals; the shorter the wake-up time, the faster the vehicle navigation system can recover work, thereby improving the response speed and efficiency of the system. Due to the limitation of the number of MCU wake-up interfaces, how to realize MCU wake-up at low cost is crucial for product lightweight. SUMMARY

[0003] Therefore, the utility model aims at providing a kind of MCU awakening circuit and vehicle navigation system, only using several triodes and resistance can realize the quick response to input wake-up signal, so that vehicle navigation system realizes wake-up function under the premise of almost no cost increase, realizes the requirement of product lightweight and low cost.

[0004] The first aspect, the utility model provides a kind of MCU awakening circuit, the MCU awakening circuit includes: signal acquisition circuit and control circuit;Control circuit at least includes first triode Q1 and fifth resistance R5;Signal acquisition circuit at least includes second triode Q2;

[0005] Wherein, the collector of first triode Q1 is connected with the wake-up interface of MCU, the collector of first triode Q1 is also connected with the power supply interface of MCU;The emitter of first triode Q1 is grounded;The base of first triode Q1 is connected with one end of fifth resistance R5;The other end of fifth resistance R5 is connected with the emitter of second triode Q2;The other end of fifth resistance is also connected with the power supply interface of MCU;The collector of second triode Q2 is grounded;The base of second triode Q2 is connected with first wake-up signal input end;The base of second triode Q2 is also connected with the power supply interface of MCU.

[0006] Optionally, signal acquisition circuit further includes sixth resistance R6 and seventh resistance R7;Wherein, one end of sixth resistance R6 is connected with the power supply interface of MCU;The other end of sixth resistance R6 is connected with one end of seventh resistance R7;One end of seventh resistance R7 is connected with first wake-up signal input end;The other end of seventh resistance R7 is connected with the base of second triode Q2.

[0007] Optionally, the resistance of the sixth resistor R6 is 10K ohms; the resistance of the seventh resistor R7 is 100 ohms; and the model of the second triode Q2 is PMBT3906.

[0008] Optionally, the signal acquisition circuit further comprises a third triode Q3; wherein the emitter of the third triode Q3 is connected to the other end of the fifth resistor R5, and the emitter of the third triode Q3 is also connected to the emitter of the second triode Q2; the collector of the third triode Q3 is connected to the collector of the second triode Q2 and then grounded; the base of the third triode Q3 is connected to the second wake-up signal input end; and the base of the third triode Q3 is also connected to the MCU power supply interface.

[0009] Optionally, the signal acquisition circuit further comprises an eighth resistor R8 and a ninth resistor R9; wherein one end of the eighth resistor R8 is connected to the MCU power supply interface; the other end of the eighth resistor R8 is connected to one end of the ninth resistor R9; one end of the ninth resistor R9 is connected to the second wake-up signal input end; and the other end of the ninth resistor R9 is connected to the base of the third triode Q3.

[0010] Optionally, the resistance of the eighth resistor R8 is 10K ohms; the resistance of the ninth resistor R9 is 100 ohms; and the model of the third triode Q3 is PMBT3906.

[0011] Optionally, the control circuit further comprises a third resistor R3 and a fourth resistor R4; wherein one end of the third resistor R3 is connected to the MCU power supply interface; the other end of the third resistor R3 is connected to the other end of the fifth resistor R5; and the other end of the third resistor R3 is also connected to the emitter of the second triode Q2 and the emitter of the third triode Q3 respectively.

[0012] One end of the fourth resistor R4 is connected to the MCU power supply interface; the other end of the fourth resistor R4 is connected to the wake-up interface of the MCU; and the other end of the fourth resistor R4 is also connected to the collector of the first triode Q1.

[0013] Optionally, the resistance of the third resistor R3 is 10K ohms; the resistance of the fourth resistor R4 is 10K ohms; and the model of the first triode Q1 is DTC114EKA.

[0014] Optionally, the control circuit further comprises a first resistor R1 and a second resistor R2; wherein the first resistor R1 and the second resistor R2 are arranged in the first triode Q1; one end of the first resistor R1 is connected to the base of the first triode Q1; one end of the first resistor R1 is also connected to one end of the second resistor R2; the other end of the first resistor R1 is connected to one end of the fifth resistor R5; one end of the second resistor R2 is connected to the base of the first triode Q1; and the other end of the second resistor R2 is connected to the emitter of the first triode Q1.

[0015] In a second aspect, the utility model discloses a vehicle navigation system, which comprises: an MCU controller and the MCU wake -up circuit mentioned in the first aspect; the MCU wake -up circuit comprises: a signal acquisition circuit and a control circuit; the control circuit comprises at least a first triode Q1 and a fifth resistance R5; the signal acquisition circuit comprises at least a second triode Q2;

[0016] Wherein, the collector of first triode Q1 is connected with the wake -up interface of MCU controller, and the collector of first triode Q1 is also connected with the power supply interface of MCU controller;The emitter of first triode Q1 is grounded;The base of first triode Q1 is connected with one end of fifth resistance R5;The other end of fifth resistance R5 is connected with the emitter of second triode Q2;The other end of fifth resistance is also connected with the power supply interface of MCU controller;The collector of second triode Q2 is grounded;The base of second triode Q2 is connected with the first wake -up signal input end;The base of second triode Q2 is also connected with the power supply interface of MCU controller.

[0017] The utility model discloses a kind of MCU wake -up circuit and vehicle navigation system, which comprises: a signal acquisition circuit and a control circuit;The control circuit comprises at least a first triode Q1 and a fifth resistance R5;The signal acquisition circuit comprises at least a second triode Q2;Wherein, the collector of first triode Q1 is connected with the wake -up interface of MCU, and the collector of first triode Q1 is also connected with the power supply interface of MCU;The emitter of first triode Q1 is grounded;The base of first triode Q1 is connected with one end of fifth resistance R5;The other end of fifth resistance R5 is connected with the emitter of second triode Q2;The other end of fifth resistance is also connected with the power supply interface of MCU;The collector of second triode Q2 is grounded;The base of second triode Q2 is connected with the first wake -up signal input end;The base of second triode Q2 is also connected with the power supply interface of MCU.This MCU wake -up circuit detects the level change of wake -up signal by signal acquisition circuit, and when the emitter and collector of second triode Q2 are turned on, the base voltage of first triode Q1 is changed at this time, and the level change caused by base voltage is transmitted to the wake -up interface of MCU by the collector of first triode Q1, so that only using several triodes and resistors realizes fast response to the input wake -up signal, so that vehicle navigation system realizes wake -up function under the premise of almost not increasing cost, realizes the requirement of product light weight and low cost.

[0018] The other features and advantages of the present application will be described in the following description and become apparent from the description, or can be learned from practice of the present application. The objectives and other advantages of the present application can be achieved and obtained by the structure particularly pointed out in the description, claims and accompanying drawings.

[0019] In order to make the above objectives, features and advantages of the present application more apparent, the following preferred embodiments are specifically described, and the accompanying drawings are referred to for detailed description. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings described below are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0021] Figure 1 A structure diagram of an MCU wake-up circuit provided by the embodiment of the present application is shown in the figure.

[0022] Figure 2 A structure diagram of another MCU wake-up circuit provided by the embodiment of the present application is shown in the figure.

[0023] Figure 3 A structure diagram of a vehicle navigation system provided by the embodiment of the present application is shown in the figure.

[0024] Icon:

[0025] Q1-first triode; Q2-second triode; Q3-third triode;

[0026] R1-first resistor; R2-second resistor; R3-third resistor; R4-fourth resistor; R5-fifth resistor; R6-sixth resistor; R7-seventh resistor; R8-eighth resistor; R9-ninth resistor. DETAILED DESCRIPTION

[0027] In order to make the objectives, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the present application will be described clearly and completely in combination with embodiments. Obviously, the described embodiments are some embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0028] The MCU of vehicle navigation is the core component of vehicle navigation system, responsible for controlling the navigation system of vehicle, and needs to ensure that the MCU can operate stably and reliably in the complex automobile internal environment. In many applications, such MCU needs to be quickly woken up from the sleep state to respond to external events or signals; the shorter the wake-up time is, the faster the vehicle navigation system can recover work, thereby improving the response speed and efficiency of the system. Due to the limitation of the number of MCU wake-up interfaces, how to realize the MCU wake-up at low cost is crucial for product lightweight. Based on this, the utility model provides a kind of MCU wake-up circuit and vehicle navigation system, and only several triodes and resistors are used to realize the quick response to the input wake-up signal, so that the vehicle navigation system realizes the wake-up function under the premise of almost no cost increase, realizes the requirements of product lightweight and low cost.

[0029] In order to facilitate the understanding of the embodiment, first, a kind of MCU wake-up circuit disclosed in the utility model embodiment is introduced in detail, as shown in Figure 1 The MCU wake-up circuit includes: signal acquisition circuit and control circuit;Control circuit at least contains first triode Q1 and fifth resistance R5;Signal acquisition circuit at least contains second triode Q2.

[0030] Wherein, the collector of first triode Q1 is connected with the wake-up interface of MCU, and the collector of first triode Q1 is also connected with the power supply interface of MCU;The emitter of first triode Q1 is grounded;The base of first triode Q1 is connected with one end of fifth resistance R5;The other end of fifth resistance R5 is connected with the emitter of second triode Q2;The other end of fifth resistance is also connected with the power supply interface of MCU;The collector of second triode Q2 is grounded;The base of second triode Q2 is connected with first wake-up signal input end;The base of second triode Q2 is also connected with the power supply interface of MCU.

[0031] The MCU wake-up circuit detects the level change of wake-up signal through signal acquisition circuit, and the emitter and collector of second triode Q2 are turned on when the level change of wake-up signal is detected, at this time, the base voltage of first triode Q1 will be changed, and the level change caused by the base voltage of first triode Q1 is transmitted to the wake-up interface of MCU through the collector of first triode Q1, so that the input wake-up signal is quickly responded to by using several triodes and resistors, so that the vehicle navigation system realizes the wake-up function under the premise of almost no cost increase, realizes the requirements of product lightweight and low cost.

[0032] As Figure 2As shown in another MCU wake-up circuit, the signal acquisition circuit further comprises a sixth resistor R6 and a seventh resistor R7; wherein one end of the sixth resistor R6 is connected with the MCU power supply interface; the other end of the sixth resistor R6 is connected with one end of the seventh resistor R7; one end of the seventh resistor R7 is connected with the first wake-up signal input end; the other end of the seventh resistor R7 is connected with the base of the second transistor Q2.

[0033] Optionally, the resistance value of the sixth resistor R6 is 10K ohms; the resistance value of the seventh resistor R7 is 100 ohms; the model of the second transistor Q2 is PMBT3906.

[0034] Optionally, the signal acquisition circuit further comprises a third transistor Q3; wherein the emitter of the third transistor Q3 is connected with the other end of the fifth resistor R5, and the emitter of the third transistor Q3 is also connected with the emitter of the second transistor Q2; the collector of the third transistor Q3 is connected with the collector of the second transistor Q2 and then grounded; the base of the third transistor Q3 is connected with the second wake-up signal input end; the base of the third transistor Q3 is also connected with the MCU power supply interface.

[0035] Optionally, the signal acquisition circuit further comprises an eighth resistor R8 and a ninth resistor R9; wherein one end of the eighth resistor R8 is connected with the MCU power supply interface; the other end of the eighth resistor R8 is connected with one end of the ninth resistor R9; one end of the ninth resistor R9 is connected with the second wake-up signal input end; the other end of the ninth resistor R9 is connected with the base of the third transistor Q3.

[0036] Optionally, the resistance value of the eighth resistor R8 is 10K ohms; the resistance value of the ninth resistor R9 is 100 ohms; the model of the third transistor Q3 is PMBT3906.

[0037] Optionally, the control circuit further comprises a third resistor R3 and a fourth resistor R4; wherein one end of the third resistor R3 is connected with the MCU power supply interface; the other end of the third resistor R3 is connected with the other end of the fifth resistor R5; the other end of the third resistor R3 is also connected with the emitter of the second transistor Q2 and the emitter of the third transistor Q3 respectively;

[0038] One end of the fourth resistor R4 is connected with the MCU power supply interface; the other end of the fourth resistor R4 is connected with the wake-up interface of the MCU; the other end of the fourth resistor R4 is also connected with the collector of the first transistor Q1.

[0039] Optionally, the resistance value of the third resistor R3 is 10K ohms; the resistance value of the fourth resistor R4 is 10K ohms; the model of the first transistor Q1 is DTC114EKA.

[0040] Optionally, the control circuit further comprises: a first resistor R1 and a second resistor R2; wherein the first resistor R1 and the second resistor R2 are arranged in the first transistor Q1; one end of the first resistor R1 is connected with the base of the first transistor Q1; the other end of the first resistor R1 is connected with one end of the second resistor R2; the other end of the first resistor R1 is connected with one end of the fifth resistor R5; one end of the second resistor R2 is connected with the base of the first transistor Q1; the other end of the second resistor R2 is connected with the emitter of the first transistor Q1.

[0041] Figure 2 The MCU wake-up circuit in the above embodiment is also composed of several transistors and resistors, when the level of the input wake-up signal INT1 / INT2 changes, for example, the level is pulled low, at this time, the base of the second transistor Q2 / third transistor Q3 of the PNP transistor is pulled low, the current flowing direction of the transistor from the emitter to the collector is turned on, the base voltage of the first transistor Q1 of the NPN transistor is pulled low, thereby controlling the first transistor Q1 to be turned off. Therefore, the output signal INT_WAKE can generate high-low level change through the interaction of the first transistor Q1 and the MCU_3V3, and the level change can be recognized as I / 0 data by the MCU controller at the back end, thereby achieving the purpose of waking up the MCU.

[0042] As can be seen from the MCU wake-up circuit mentioned in the above embodiment, the MCU wake-up circuit only uses several transistors and resistors to quickly respond to the input wake-up signal, so that the vehicle navigation system realizes the wake-up function under the premise of almost no cost increase, and realizes the requirements of product light weight and low cost.

[0043] The utility model embodiment provides a kind of vehicle navigation system, as shown in Figure 3 The vehicle navigation system includes: MCU controller and the MCU wake-up circuit mentioned in the above embodiment;The MCU wake-up circuit includes: signal acquisition circuit and control circuit;Control circuit at least includes first transistor Q1 and fifth resistor R5;Signal acquisition circuit at least includes second transistor Q2;

[0044] Wherein, the collector of the first transistor Q1 is connected with the wake-up interface of the MCU controller, and the collector of the first transistor Q1 is also connected with the power supply interface of the MCU controller;The emitter of the first transistor Q1 is grounded;The base of the first transistor Q1 is connected with one end of the fifth resistor R5;The other end of the fifth resistor R5 is connected with the emitter of the second transistor Q2;The other end of the fifth resistor is also connected with the power supply interface of the MCU controller;The collector of the second transistor Q2 is grounded;The base of the second transistor Q2 is connected with the first wake-up signal input end;The base of the second transistor Q2 is also connected with the power supply interface of the MCU controller.

[0045] The vehicle navigation system provided by the embodiment of the utility model, in the wake-up process by using the built-in MCU wake-up circuit, the principle realized and the technical effect produced are same with the aforementioned MCU wake-up circuit embodiment, for brief description, the part of device embodiment not mentioned can refer to the corresponding content in the aforementioned embodiment.

[0046] In several embodiments provided in the present application, it should be understood that the disclosed system and device can be implemented in other ways. The device embodiments described above are only schematic. For example, the division of the units is only a logical function division, and there can be another division manner in actual implementation. For example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some communication interfaces, devices or units, and can be electrical, mechanical or other forms.

[0047] The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, i.e. they can be located in one place, or can be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.

[0048] In addition, each functional unit in each embodiment of the utility model can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit.

[0049] If the functions are realized in the form of software function units and sold or used as independent products, they can be stored in a non-volatile computer readable storage medium executable by a processor. Based on this understanding, the technical solutions of the utility model essentially or the part that contributes to the prior art or part of the technical solutions can be embodied in the form of software products, and the computer software product is stored in a storage medium, including a plurality of instructions for making a computer device (which can be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the method described in each embodiment of the utility model. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disk and various program code storage media.

[0050] Finally, it should be noted that the above-described embodiments are merely specific embodiments of the present application, which are used to illustrate the technical solutions of the present application, but not to limit the same, and the protection scope of the present application is not limited thereto. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can modify or easily think of changes to the technical solutions recorded in the foregoing embodiments, or make equivalent replacements to some of the technical features within the technical range disclosed by the present application; and these modifications, changes or replacements do not cause the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An MCU wake-up circuit, characterized by The MCU wake-up circuit comprises a signal acquisition circuit and a control circuit; the control circuit comprises at least a first transistor (Q1) and a fifth resistor (R5); the signal acquisition circuit comprises at least a second transistor (Q2); The collector of the first transistor (Q1) is connected with the wake-up interface of the MCU, and the collector of the first transistor (Q1) is also connected with the power supply interface of the MCU; the emitter of the first transistor (Q1) is grounded; the base of the first transistor (Q1) is connected with one end of the fifth resistor (R5); the other end of the fifth resistor (R5) is connected with the emitter of the second transistor (Q2); the other end of the fifth resistor is also connected with the power supply interface of the MCU; the collector of the second transistor (Q2) is grounded; the base of the second transistor (Q2) is connected with the first wake-up signal input end; the base of the second transistor (Q2) is also connected with the power supply interface of the MCU.

2. The MCU wake-up circuit of claim 1, wherein, The signal acquisition circuit further comprises a sixth resistor (R6) and a seventh resistor (R7); one end of the sixth resistor (R6) is connected with the power supply interface of the MCU; the other end of the sixth resistor (R6) is connected with one end of the seventh resistor (R7); one end of the seventh resistor (R7) is connected with the first wake-up signal input end; the other end of the seventh resistor (R7) is connected with the base of the second transistor (Q2).

3. The MCU wake-up circuit of claim 2, wherein, The resistance value of the sixth resistor (R6) is 10K ohms; the resistance value of the seventh resistor (R7) is 100 ohms; the model of the second transistor (Q2) is PMBT3906.

4. The MCU wake-up circuit of claim 1, wherein, The signal acquisition circuit further comprises a third transistor (Q3); The emitter of the third transistor (Q3) is connected with the other end of the fifth resistor (R5), and the emitter of the third transistor (Q3) is also connected with the emitter of the second transistor (Q2); the collector of the third transistor (Q3) is connected with the collector of the second transistor (Q2) and then grounded; the base of the third transistor (Q3) is connected with the second wake-up signal input end; the base of the third transistor (Q3) is also connected with the power supply interface of the MCU.

5. The MCU wake-up circuit of claim 4, wherein, The signal acquisition circuit further comprises an eighth resistor (R8) and a ninth resistor (R9); one end of the eighth resistor (R8) is connected with the power supply interface of the MCU; the other end of the eighth resistor (R8) is connected with one end of the ninth resistor (R9); one end of the ninth resistor (R9) is connected with the second wake-up signal input end; the other end of the ninth resistor (R9) is connected with the base of the third transistor (Q3).

6. The MCU wake-up circuit of claim 5, wherein, The resistance value of the eighth resistor (R8) is 10K ohms; the resistance value of the ninth resistor (R9) is 100 ohms; the model of the third transistor (Q3) is PMBT3906.

7. The MCU wake-up circuit of claim 4, wherein, The control circuit further comprises a third resistor (R3) and a fourth resistor (R4); One end of the third resistor (R3) is connected with the MCU power supply interface; the other end of the third resistor (R3) is connected with the other end of the fifth resistor (R5); the other end of the third resistor (R3) is also connected with the emitter of the second triode (Q2) and the emitter of the third triode (Q3) respectively; One end of the fourth resistor (R4) is connected with the MCU power supply interface; the other end of the fourth resistor (R4) is connected with the MCU wake-up interface; the other end of the fourth resistor (R4) is also connected with the collector of the first triode (Q1).

8. The MCU wake-up circuit of claim 7, wherein, The resistance value of the third resistor (R3) is 10K ohms; the resistance value of the fourth resistor (R4) is 10K ohms; the model of the first triode (Q1) is DTC114EKA.

9. The MCU wake-up circuit of claim 1, wherein, The control circuit further comprises a first resistor (R1) and a second resistor (R2); wherein the first resistor (R1) and the second resistor (R2) are arranged in the first triode (Q1); One end of the first resistor (R1) is connected with the base of the first triode (Q1); one end of the first resistor (R1) is also connected with one end of the second resistor (R2); the other end of the first resistor (R1) is connected with one end of the fifth resistor (R5); One end of the second resistor (R2) is connected with the base of the first triode (Q1); the other end of the second resistor (R2) is connected with the emitter of the first triode (Q1).

10. An in-vehicle navigation system characterized by comprising: The vehicle-mounted navigation system comprises an MCU controller and an MCU wake-up circuit according to any one of claims 1 to 9; the MCU wake-up circuit comprises a signal acquisition circuit and a control circuit; the control circuit at least comprises a first triode (Q1) and a fifth resistor (R5); the signal acquisition circuit at least comprises a second triode (Q2); One end of the first triode (Q1) is connected with the wake-up interface of the MCU controller, and the collector of the first triode (Q1) is also connected with the power supply interface of the MCU controller; the emitter of the first triode (Q1) is grounded; the base of the first triode (Q1) is connected with one end of the fifth resistor (R5); the other end of the fifth resistor (R5) is connected with the emitter of the second triode (Q2); the other end of the fifth resistor is also connected with the power supply interface of the MCU controller; the collector of the second triode (Q2) is grounded; the base of the second triode (Q2) is connected with the first wake-up signal input end; the base of the second triode (Q2) is also connected with the power supply interface of the MCU controller.

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