Wake-up circuit

Abstract

The utility model discloses a wake-up circuit, and relates to the technical field of automobiles. The wake-up circuit comprises a processor and a target interface located on the circuit board; and a wakeup signal output line of the processor on the circuit board is connected with a device to be waken up. Due to the fact that the target interface is arranged on the circuit board, when the processor is the second processor, the empty pin of the second processor is connected with the target interface, and the function of the second processor can be achieved; and when the processor is the first processor, the empty pin of the first processor and the target interface are in a disconnected state, so that the function of the first processor can be realized. That is to say, different processors can realize corresponding functions through the same type of PCB without designing multiple types of PCBs, so that the cost is reduced; and compared with the condition that a complicated CAN chip is completely used no matter the customer needs to wake up the CAN, in the wake-up circuit provided by the utility model, the customer can use a simple CAN chip when the customer does not need to wake up the CAN, so that the cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of automobile, in particular to a kind of wake-up circuit. BACKGROUND

[0002] With the continuous improvement of intelligentization and networking of automobile electronics, Controller Area Network (CAN) bus technology, as a kind of general vehicle-mounted bus standard, has gradually become an important means to connect various module nodes inside the vehicle.

[0003] Among the related domain controller wake-up technology, there are KL15 or CAN_INH wake-up. Different types of CAN chips are selected based on the needs of different customers, and the biggest difference is whether to support CAN wake-up function. If the customer needs CAN wake-up, a CAN chip with INH function needs to be used. If the customer does not need CAN wake-up function, a relatively simple CAN chip can be selected for use. Due to the difference in pin number and layout between the INH function CAN chip and the simple CAN chip, in order to meet the needs of customers, a corresponding version of Printed Circuit Board (PCB) needs to be set for each chip, resulting in an increase in the version of hardware PCB; or regardless of whether the customer needs CAN wake-up, all complex CAN chips are used, resulting in cost waste.

[0004] Therefore, when meeting the CAN wake-up function of customers, how to reduce the version of hardware PCB and reduce cost is a technical problem that needs to be solved by personnel in the field. UTILITY MODEL CONTENT

[0005] The utility model aims to provide a kind of wake-up circuit, to solve the technical problem that when facing the wake-up needs of different customers, different function CAN chips are used, resulting in multiple PCB versions being needed;Or all complex CAN chips are used, resulting in increased cost.

[0006] To solve the above technical problems, the utility model provides a kind of wake-up circuit, including processor and target interface on circuit board;The wake-up signal output line of the processor on the circuit board is connected with the device to be woken up;

[0007] The processor is a first processor or a second processor;

[0008] The same pin as the layout of the second processor exists in the pin of the first processor;There are empty pins in the first processor and the second processor, and the empty pin of the first processor only includes the empty pin on the pin position, and the empty pin of the second processor and the corresponding pin of the target interface share the pin position;

[0009] The processor is the first processor, and the empty pin of the first processor is disconnected from the target interface;

[0010] The processor is the second processor, and the empty pin of the second processor is connected to the target interface.

[0011] Exemplarily, the circuit board further comprises a first protection circuit;

[0012] The processor is the first processor, and the first protection circuit between the empty pin of the first processor and the target interface is disconnected;

[0013] The processor is the second processor, and the empty pin of the second processor is connected to the target interface through the first protection circuit.

[0014] Exemplarily, the first protection circuit comprises a first resistance of 0 ohm.

[0015] Exemplarily, the wake-up signal output line is a differential signal output line.

[0016] Exemplarily, a first filter circuit is arranged on the differential signal output line; wherein the first filter circuit comprises a common-mode choke.

[0017] Exemplarily, a second filter circuit is arranged on the differential signal output line; the second filter circuit comprises a second resistance, a third resistance and a first capacitor;

[0018] A first end of the second resistance is connected to a first output end of the common-mode choke and the device to be woken up respectively; and a first end of the third resistance is connected to a second output end of the common-mode choke and the device to be woken up respectively.

[0019] A second end of the second resistance and a second end of the third resistance are both connected to a first end of the first capacitor, and a second end of the first capacitor is grounded.

[0020] Exemplarily, a third filter circuit is arranged on the differential signal output line; the third filter circuit comprises a second capacitor and a third capacitor;

[0021] A first end of the second capacitor is connected to the first end of the second resistance and the device to be woken up respectively.

[0022] A first end of the third capacitor is connected to the first end of the third resistance and the device to be woken up respectively.

[0023] Second ends of the second capacitor and the third capacitor are both grounded.

[0024] Exemplarily, an overvoltage protection circuit is arranged on the differential signal output line.

[0025] Exemplarily, the overvoltage protection circuit comprises a first TVS tube and a second TVS tube.

[0026] An anode of the first TVS tube is connected with a first end of the second capacitor and the device to be woken up respectively.

[0027] An anode of the second TVS tube is connected with a first end of the third capacitor and the device to be woken up respectively.

[0028] A cathode of the first TVS tube and a cathode of the second TVS tube are grounded.

[0029] Exemplarily, the circuit board further comprises a resistor for working mode configuration; one end of the resistor for working mode configuration is connected with a mode control pin of the processor, and the other end of the resistor for working mode configuration is grounded.

[0030] The utility model provides a wake -up circuit, including processor and target interface on circuit board, wake -up signal output line of processor on circuit board is connected with the device to be woken up. The pin of first processor exists with the pin of second processor layout same pin, and the pin of first processor empty pin only includes empty pin, and the pin of second processor empty pin and target interface corresponding pin share pin. Because setting up target interface on circuit board, when the processor is second processor, through connecting the empty pin of second processor with target interface, can realize the function of second processor, when the processor is first processor, the empty pin of first processor and target interface are in the disconnected state, can realize the function of first processor. That is, through same kind of PCB makes different processor realize corresponding function, need not to design many kinds of PCB, reduces the cost, and compared with not matter customer needs CAN wake -up, all use complex CAN chip, the utility model provides a wake -up circuit, when customer does not need CAN wake -up, then can use simple CAN chip, thereby reduces the cost. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the utility model, the following will be a brief introduction to the drawings needed to be used in the embodiment, obviously, the drawings in the following description only some embodiments of the utility model, for those skilled in the art, under the premise of not paying creative labor, still can obtain other drawings according to these drawings.

[0032] Figure 1 It is a schematic diagram of a wake -up circuit provided by the utility model embodiment;

[0033] Figure 2 A front view integrated machine wake-up topology schematic diagram provided by the embodiment of the utility model;

[0034] Figure 3 A CAN wake-up schematic diagram provided by the embodiment of the utility model;

[0035] Figure 4 A KL15 wake-up schematic diagram provided by the embodiment of the utility model;

[0036] Figure 5 A CAN wake-up and KL15 wake-up simultaneous support circuit schematic diagram provided by the embodiment of the utility model;

[0037] Figure 6 A PCB effect diagram provided by the embodiment of the utility model. DETAILED DESCRIPTION

[0038] The technical scheme in the embodiments of the utility model will be described clearly and completely below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0039] The core of the utility model is to provide a wake-up circuit to solve the technical problem that different CAN chips are used to meet the wake-up requirements of different customers, resulting in the need for multiple PCB versions; or complex CAN chips are used, resulting in increased costs.

[0040] In order to make the personnel in the technical field better understand the utility model scheme, the utility model will be further described in detail below with reference to the drawings and specific embodiments. Figure 1 A wake-up circuit schematic diagram provided by the embodiment of the utility model, as shown in Figure 1 The wake-up circuit includes a processor and a target interface on a circuit board; the processor is connected with a wake-up device through a wake-up signal output line on the circuit board.

[0041] The wake-up signal output line of the processor is connected with the wake-up device.

[0042] The processor is a first processor or a second processor;

[0043] The first processor has the same pin layout as the second processor; both the first processor and the second processor have empty pins, and the empty pin of the first processor only includes an empty pin on the pin position, and the empty pin of the second processor and the corresponding pin of the target interface share the pin position;

[0044] The processor is a first processor, and the empty pin of the first processor is in a disconnected state with the target interface;

[0045] The processor is a second processor, and the empty pin of the second processor is connected with the target interface.

[0046] With the continuous improvement of the intelligence and networking of automobile electronics, the CAN bus technology, as a general vehicle-mounted bus standard, has gradually become an important means of connecting various module nodes in the vehicle. The current market mainstream front view all-in-one machine has demand for the CAN interface, which is mainly used for communication connection between the all-in-one machine module and other positions of the vehicle body, such as chassis, instruments and radar, etc. The common signals of the current market automobile domain controller are KL30 and KL15, wherein the KL30 is connected to the storage battery and belongs to the normal power, the types of the signal for waking up the controller can be high-low level wake-up, edge signal and CAN bus signal, etc., and the device to be woken up can be a power supply chip or a single-chip microcomputer. Common wake-up sources are KL15, CAN controller wake-up and Ethernet, etc.

[0047] Figure 2 A front view all-in-one machine wake-up topology schematic diagram is provided for the embodiment of the utility model. The KL30 obtains a pure input source after DC-LINK filtering, and inputs power supply for the first-stage power supply, and the first-stage power supply can be started through different wake-up modes, so as to output the first-stage power supply and supply power for the rear-stage MCU or PMIC. The current schematic diagram supports the following wake-up modes: KL15 or CAN_INH wake-up.

[0048] Different types of CAN chips are selected based on the wake-up requirements of different customers, and the biggest difference is whether the CAN wake-up function needs to be supported. If the customer requires the CAN wake-up, the CAN chip with the INH function needs to be used, and if the customer does not require the CAN wake-up function, the CAN chip with relatively simple function can be selected for use.

[0049] In order to meet the wake-up requirements of different customers, reduce the number of PCB versions and reduce the cost, the utility model sets the target interface on the circuit board. The empty pin exists in the first processor and the second processor, and the pin position of the empty pin of the first processor only includes the empty pin, and the empty pin of the second processor and the corresponding pin of the target interface share the pin position. Therefore, the target interface set on the circuit board is another interface corresponding to the function realized on the shared pin position of the empty pin of the second processor. If the NC pin position and the VIO power supply pin position share one pin position, the target interface is the VIO interface.

[0050] The processor is a first processor, and a null pin of the first processor is in a disconnected state with the target interface; the processor is a second processor, and a null pin of the second processor is connected with the target interface. That is, the functions of the first processor and the second processor can be realized through one circuit board, thereby meeting different wake-up requirements of customers.

[0051] In some embodiments, in order to protect the processor, the circuit board further comprises a first protection circuit;

[0052] The processor is a first processor, and a null pin of the first processor is disconnected with the first protection circuit between the first processor and the target interface;

[0053] The processor is a second processor, and a null pin of the second processor is connected with the target interface through the first protection circuit.

[0054] The first protection circuit comprises a resistor. The second processor is protected by connecting the resistor in series between the null pin of the second processor and the target interface. The resistor in series is not limited, for example, the first protection circuit comprises a first resistor with 0 ohm.

[0055] In order to improve the quality and reliability of the signal, in some embodiments, the wake-up signal output line of the wake-up circuit is a differential signal output line. For example, the CANH signal output line and the CANL signal output line. When there is noise interference in the external environment, the noise will be loaded on the two signal lines at the same time, but since the two signals are opposite in phase, the difference is 0, that is, the noise has no effect on the logic meaning of the signal, thereby effectively improving the quality and reliability of the signal.

[0056] In addition, the first filter circuit is arranged on the differential signal output line; wherein the first filter circuit comprises a common mode choke. The inductance is connected in series on the differential signal output line, which reduces the influence of common mode noise and power supply noise on the signal. By connecting the inductance in series on the differential signal line, high-frequency noise can be effectively suppressed, signal distortion can be reduced, and signal integrity can be improved.

[0057] In some embodiments, a second filter circuit is arranged on the differential signal output line; the second filter circuit comprises a second resistor, a third resistor and a first capacitor;

[0058] The first end of the second resistor is connected with the first output end of the common mode choke and the device to be woken up respectively; the first end of the third resistor is connected with the second output end of the common mode choke and the device to be woken up respectively;

[0059] The second end of the second resistor and the second end of the third resistor are both connected with the first end of the first capacitor, and the second end of the first capacitor is grounded.

[0060] In some embodiments, a third filtering circuit is arranged on the differential signal output line; the third filtering circuit comprises a second capacitor and a third capacitor;

[0061] The first end of the second capacitor is connected with the first end of the second resistor and the device to be woken up respectively;

[0062] The first end of the third capacitor is connected with the first end of the third resistor and the device to be woken up respectively;

[0063] The second end of the second capacitor and the second end of the third capacitor are grounded.

[0064] In some embodiments, an overvoltage protection circuit is arranged on the differential signal output line. The overvoltage protection circuit comprises a first TVS tube and a second TVS tube;

[0065] The anode of the first TVS tube is connected with the first end of the second capacitor and the device to be woken up respectively;

[0066] The anode of the second TVS tube is connected with the first end of the third capacitor and the device to be woken up respectively;

[0067] The cathode of the first TVS tube and the cathode of the second TVS tube are grounded.

[0068] In some embodiments, the circuit board further comprises a resistor for work mode configuration. One end of the resistor for work mode configuration is connected with a mode control pin (nSTB) of the processor, and the other end of the resistor for work mode configuration is grounded.

[0069] In order to make the person skilled in the art better understand the technical scheme of the present application, the present application will be further described in detail below in combination with the drawings and specific embodiments.

[0070] The first wake-up mode is introduced as follows: only CAN wake-up is needed.

[0071] The vehicle architecture has a demand for CAN wake-up, and a chip supporting CAN wake-up needs to be selected, and an INH pin needs to be provided. Figure 3 A schematic diagram of CAN wake-up provided by the embodiments of the present application is shown in FIG. 1. Figure 3The first processor supporting CAN wake-up, i.e., CAN chip U2, is shown, and U2 is provided with an INH function. A first filter circuit is arranged on a differential signal output line; the first filter circuit comprises a common-mode choke coil L1. A second filter circuit is arranged on the differential signal output line; the second filter circuit comprises a second resistor R2, a third resistor R3 and a first capacitor C1; a first end of the second resistor R2 is connected with a first output end of the common-mode choke coil L1 and a to-be-woken-up device respectively; a first end of the third resistor R3 is connected with a second output end of the common-mode choke coil L1 and the to-be-woken-up device respectively; a second end of the second resistor R2 and a second end of the third resistor R3 are both connected with a first end of the first capacitor C1, and a second end of the first capacitor C1 is grounded. A third filter circuit is arranged on the differential signal output line. The third filter circuit comprises a second capacitor C2 and a third capacitor C3; a first end of the second capacitor C2 is connected with the first end of the second resistor R2 and the to-be-woken-up device respectively; a first end of the third capacitor C3 is connected with the first end of the third resistor R3 and the to-be-woken-up device respectively; a second end of the second capacitor C2 and a second end of the third capacitor C3 are both grounded. An overvoltage protection circuit is arranged on the differential signal output line. The overvoltage protection circuit comprises a first TVS tube and a second TVS tube. The first TVS tube and the second TVS tube are a TVS tube array D1.

[0072] The anode of the first TVS tube is connected with the first end of the second capacitor C2 and the to-be-woken-up device respectively;

[0073] The anode of the second TVS tube is connected with the first end of the third capacitor C3 and the to-be-woken-up device respectively;

[0074] The cathode of the first TVS tube and the cathode of the second TVS tube are both grounded.

[0075] The circuit board further comprises a resistor R4 for working mode configuration. One end of the resistor R4 for working mode configuration is connected with a mode control pin (nSTB) of U2, and the other end of the resistor R4 for working mode configuration is grounded.

[0076] The second wake-up mode is introduced as follows: only KL15 wake-up is needed.

[0077] The whole vehicle framework has no demand for CAN wake-up and only KL15 wake-up is needed, at this time, a relatively simple CAN chip can be selected. Figure 4 A KL15 wake-up schematic diagram provided by the utility model embodiment is shown as follows, Figure 4As shown, only the second processor supporting KL15 wake-up, namely CAN chip U3. By comparing the above two schemes, it can be concluded that if the PCB compatible design is to be achieved, the difference between the two is mainly in U2_PIN11 and U3_PIN5. U2_PIN11 is an NC pin and has no actual function, so it is not externally connected. U3_PIN5 needs to be externally connected to the VIO power supply. If U3 is directly replaced by U2, it will cause U3 to not work normally. Because the two types of CAN chips have different numbers of pins, and the main function pins can be designed as multiplexing. And the mainstream packaging of current CAN chips has three forms of small outline transistor-23 (Small Outline Transistor-23, SOT-23), very small outline no-lead (Very Small Outline No-lead, VSON), and silicon on insulator (Silicon on Insulator, SOIC), which are divided into 14PIN and 8PIN, and the pin pitch and width of the 14PIN and 8PIN of the same packaging form are the same, so the 14PIN packaging can also be adapted to the 8PIN. For the platform design of the product, from the interface compatibility of the hardware design to meet the different needs of customers, the same PCB hardware can be used to realize the needs, and only the corresponding bill of material (Bill of Material, BOM) needs to be modified, while the cost optimization of the all-in-one machine is considered. For this modification on the circuit, when the customer does not need CAN wake-up, U2 can be replaced by U3, which is convenient for cost saving.

[0078] The third wake-up mode is introduced below: that is, the CAN wake-up and KL15 wake-up provided by the embodiment of the utility model need at the same time. Figure 5 The schematic diagram of the circuit provided by the embodiment of the utility model for supporting CAN wake-up and KL15 wake-up at the same time is compared Figure 3 and Figure 5 , Figure 5 In the NC pin of U2, the VIO power supply is connected. The circuit board also includes a first protection circuit. For example, the first resistor R1 is connected in series between the NC pin and the VIO power supply. U2 and U3 can be used interchangeably on the same PCB. Figure 5 In the NC pin of U2, the VIO power supply is connected. The circuit board also includes a first protection circuit. For example, the first resistor R1 is connected in series between the NC pin and the VIO power supply. U2 and U3 can be used interchangeably on the same PCB.

[0079] Requirement 1: If only CAN wake-up is implemented, select U2, R4, L1, R2, R3, C1, C12, C3, D1, R1, and U3 are not mounted.

[0080] To achieve requirement 2: as only KL15 wake-up is achieved, select U3, R1, R4, L1, R2, R3, C1, C12, C3, D1 patches, and U2 is not a patch.

[0081] Figure 6 The utility model provides a PCB effect picture. When the customer only needs KL15 wake-up or CAN wake-up, the use cost of CAN chip is reduced, because the hardware PCB of incompatible design can not be shared, and two versions of hardware PCBs are needed. Through the wake-up circuit provided by the utility model, if the customer needs only KL15 wake-up or CAN wake-up after compatible design, different BOMs are generated in different ways, so that different needs can correspond to use the same PCB, and it is not necessary to design two or more PCBs, thereby reducing the cost. Compared with using complex CAN chips regardless of whether the customer needs CAN wake-up, different CAN chips can be used in the wake-up circuit provided by the utility model, thereby reducing the cost.

[0082] The wake-up circuit provided by the utility model is described in detail above. The embodiments in the specification are described in a progressive manner, and each embodiment mainly describes the differences from other embodiments. The same or similar parts of each embodiment can be referred to. It should be pointed out that, for ordinary skilled persons in the technical field, without departing from the principle of the utility model, the utility model can be improved and modified in many ways, and these improvements and modifications also fall within the protection scope of the utility model.

[0083] It should be further noted that, in the specification, relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to the process, method, article or equipment. Without more limitations, the element defined by the statement "including a" does not exclude the presence of another identical element in the process, method, article or equipment including the element.

Claims

1. A wake-up circuit, characterized by, The processor is connected with a target interface on a circuit board; the processor is connected with a wake-up signal output line on the circuit board and a device to be woken up; The processor is a first processor or a second processor; The first processor has pins with the same layout as the second processor; both the first processor and the second processor have empty pins, and the empty pins of the first processor only include the empty pins on the pin positions; the empty pins of the second processor and the corresponding pins of the target interface share the pin positions; The processor is the first processor, and the empty pins of the first processor are in a disconnected state with the target interface; The processor is the second processor, and the empty pins of the second processor are connected with the target interface.

2. The wake-up circuit of claim 1, wherein, The circuit board further comprises a first protection circuit; The processor is the first processor, and the first protection circuit is disconnected between the empty pins of the first processor and the target interface; The processor is the second processor, and the empty pins of the second processor are connected with the target interface through the first protection circuit.

3. The wake-up circuit of claim 2, wherein, The first protection circuit comprises a first resistor with a resistance of 0 ohm.

4. The wake-up circuit according to any one of claims 1 to 3, characterized in that, The wake-up signal output line is a differential signal output line.

5. The wake-up circuit of claim 4, wherein, A first filter circuit is arranged on the differential signal output line; the first filter circuit comprises a common-mode choke.

6. The wake-up circuit of claim 5, wherein, A second filter circuit is arranged on the differential signal output line; the second filter circuit comprises a second resistor, a third resistor and a first capacitor; The first end of the second resistor is connected with the first output end of the common-mode choke and the device to be woken up respectively; the first end of the third resistor is connected with the second output end of the common-mode choke and the device to be woken up respectively; The second end of the second resistor and the second end of the third resistor are both connected with the first end of the first capacitor, and the second end of the first capacitor is grounded.

7. The wake-up circuit of claim 6, wherein, A third filter circuit is arranged on the differential signal output line; the third filter circuit comprises a second capacitor and a third capacitor; The first end of the second capacitor is connected with the first end of the second resistor and the device to be woken up respectively; The first end of the third capacitor is connected with the first end of the third resistor and the device to be woken up respectively; The second end of the second capacitor and the second end of the third capacitor are both grounded.

8. The wake-up circuit of claim 7, wherein, An overvoltage protection circuit is arranged on the differential signal output line.

9. The wake-up circuit of claim 8, wherein, The overvoltage protection circuit comprises a first TVS tube and a second TVS tube; The anode of the first TVS tube is connected with the first end of the second capacitor and the device to be woken up respectively; The anode of the second TVS tube is connected with the first end of the third capacitor and the device to be woken up respectively; The cathode of the first TVS tube and the cathode of the second TVS tube are both grounded.

10. The wake-up circuit of claim 4, wherein, The circuit board further comprises a resistor for work mode configuration; one end of the resistor for work mode configuration is connected with a mode control pin of the processor, and the other end of the resistor for work mode configuration is grounded.

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