CN219287492U - Circuit for realizing low-power consumption awakening by using integrated CAN chip - Google Patents
Circuit for realizing low-power consumption awakening by using integrated CAN chip Download PDFInfo
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- CN219287492U CN219287492U CN202320349259.1U CN202320349259U CN219287492U CN 219287492 U CN219287492 U CN 219287492U CN 202320349259 U CN202320349259 U CN 202320349259U CN 219287492 U CN219287492 U CN 219287492U
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Abstract
The utility model provides a circuit for realizing low-power consumption awakening by using an integrated CAN chip, which comprises an electrostatic protection circuit, a filter circuit, a terminal matching circuit, a CAN reading circuit and a power supply activating circuit which are connected in sequence; the CAN signal is output after the electrostatic protection circuit performs electrostatic treatment on a CAN line connected with a vehicle body, the CAN signal is filtered by the filter circuit, clutter interference is restrained, the filtered CAN signal is matched by the terminal matching circuit, the recessive level on the bus is stabilized, the CAN signal output by the terminal matching circuit is read by the CAN reading circuit, when the high-level signal is read, a power supply activating signal is sent to the power supply activating circuit to activate the power supply, and the vehicle-mounted equipment CAN start to work. The utility model has higher circuit integration level, fewer peripheral components, fewer wire harnesses and simpler circuit, thus having higher reliability and stability and smaller occupied area of the PCB; adopts a domestic chip SIT1043 or NCA1043 to realize domestic substitution.
Description
Technical Field
The utility model relates to the technical field of automobile circuit control, in particular to a circuit for realizing low-power consumption wake-up by using an integrated CAN chip.
Background
Along with the development of automobile electronics, the types of vehicle-mounted electric appliances on each automobile are more and more, and the electronic equipment must enter a dormant or shutdown mode after the automobile is flameout, otherwise, the storage battery is charged without ignition for a long time, and the storage battery can be fed and needs to be electrified to be started again. In order to enable the electronic equipment to have a dormancy/awakening function, the existing method is to use KL_15 (ignition wire) for control, such as a finished automobile CAN awakening circuit based on a TJA1041AT interface chip of a patent CN204659637U, and the ignition signal KL_15 is used as a trigger signal to be connected with a wakeup pin of the TJA1041AT interface chip, but the method has a large number of wire harnesseand loads on installation and cost, and some vehicle-mounted equipment CAN be started only after ignition, so that the vehicle-using experience is affected;
therefore, there is a need to develop a new circuit to solve the above-mentioned problems.
Disclosure of Invention
Aiming at the problems existing in the prior art, the utility model provides a circuit for realizing low-power consumption wake-up by using an integrated CAN chip.
In order to achieve the above object, the present utility model is specifically as follows:
the utility model provides a circuit for realizing low-power consumption awakening by using an integrated CAN chip, which comprises an electrostatic protection circuit, a filter circuit, a terminal matching circuit, a CAN reading circuit and a power supply activating circuit which are connected in sequence;
the CAN signal is output after the electrostatic protection circuit performs electrostatic treatment on a CAN line connected with a vehicle body, the CAN signal is filtered by the filter circuit, clutter interference is restrained, the filtered CAN signal is matched by the terminal matching circuit, the recessive level on the bus is stabilized, the CAN signal output by the terminal matching circuit is read by the CAN reading circuit, when the high-level signal is read, a power supply activating signal is sent to the power supply activating circuit to activate the power supply, and the vehicle-mounted equipment CAN start to work;
the CAN reading circuit is realized by adopting an integrated chip U1.
Further, the electrostatic protection circuit includes: an antistatic tube ED1;
two wires CAN_ H, CAN _L of the CAN signal are respectively connected with a pin 1 and a pin 2 of the antistatic tube ED1, and a pin 3 of the antistatic tube ED1 is grounded.
Further, the filter circuit includes: a common mode inductance L1;
the pin 1 and the pin 4 of the common-mode inductor L1 are respectively connected with the pin 1 and the pin 2 of the anti-static tube ED 1.
Further, the terminal matching circuit includes: a resistor R1 and a resistor R2;
one end of the resistor R1 is simultaneously connected with the pin 2 of the common mode inductor L1 and the pin 13 of the chip U1, and the other end of the resistor R1 is connected with one end of the resistor R2;
one end of the resistor R2 connected with the resistor R1 is also connected with the pin 11 of the chip U1 and one end of the capacitor C4, and the other end of the capacitor C4 is grounded;
the other end of the resistor R2 is connected with the pin 12 of the chip U1 and the pin 3 of the common mode inductor L1 at the same time.
Further, the CAN reading circuit includes: a chip U1;
the pin 10 of the chip U1 is connected with the power supply VBAT and is simultaneously connected with one end of the resistor R3, and the other end of the resistor R3 is connected with the pin 9 of the chip U1.
Further, the power supply activation circuit includes: capacitance C1, capacitance C2, capacitance C3, magnetic bead FB1;
the pin 2 of the chip U1 is grounded, the pin 3 of the chip U1 is connected with one end of the capacitor C1, the capacitor C2 and the magnetic bead FB1,
the other ends of the capacitor C1 and the capacitor C2 are grounded, the other end of the magnetic bead FB1 is simultaneously connected with a 5V power supply and one end of the capacitor C3, and the other end of the capacitor C3 is grounded;
the pin 5 of the chip U1 is connected with a 3.3V power supply;
the pin 7 of the chip U1 is used for being connected to an enabling pin of an external power supply, outputting a low level when no CAN signal is active on the vehicle, closing all external power supplies, and only the CAN transceiver chip keeps standby current at the moment to realize low-power standby; when the CAN message is arranged on the CAN bus, the pin 7 outputs high level, and activates the power supply to start the vehicle-mounted equipment.
Further, the model number of the chip U1 is as follows: SIT1043 or NCA1043.
The technical scheme of the utility model has the following beneficial effects:
1. compared with the prior art, the integrated circuit has the advantages of higher circuit integration level, fewer peripheral components, fewer wire harnesses, simpler circuit, higher reliability and stability, and smaller occupied area of the PCB;
2. adopts a domestic chip SIT1043 or NCA1043 to realize domestic substitution.
Drawings
FIG. 1 is a functional block diagram of the present utility model;
fig. 2 is a circuit diagram of the present utility model.
In the figure: 1. an electrostatic protection circuit; 2. a filter circuit; 3. a terminal matching circuit; 4. a CAN reading circuit; 5. the power supply activates the circuit.
Detailed Description
The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.
In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "front", "rear", "left", "right", and the like are orientation or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.
As shown in fig. 1-2, the utility model provides a circuit for realizing low-power consumption wake-up by using an integrated CAN chip, which comprises an electrostatic protection circuit 1, a filter circuit 2, a terminal matching circuit 3, a CAN reading circuit 4 and a power supply activation circuit 5 which are connected in sequence; the CAN reading circuit is realized by adopting an integrated chip U1. The model number of the chip U1 is as follows: SIT1043 or NCA1043.
The static protection circuit 1 outputs CAN signals after carrying out static treatment on CAN lines connected with a vehicle body, the filter circuit 2 filters the CAN signals to inhibit clutter interference, the terminal matching circuit 3 matches the filtered CAN signals and stabilizes the recessive level on a bus, the CAN reading circuit 4 reads the CAN signals output by the terminal matching circuit 3, and when the high-level signals are read, a power supply activating signal is sent to the power supply activating circuit 5 to activate a power supply, and the vehicle-mounted equipment CAN start to work;
the electrostatic protection circuit 1 includes: an antistatic tube ED1; two wires CAN_ H, CAN _L of the CAN signal are respectively connected with a pin 1 and a pin 2 of the antistatic tube ED1, and a pin 3 of the antistatic tube ED1 is grounded.
The filter circuit 2 includes: a common mode inductance L1; the pin 1 and the pin 4 of the common-mode inductor L1 are respectively connected with the pin 1 and the pin 2 of the anti-static tube ED 1.
The terminal matching circuit 3 includes: a resistor R1 and a resistor R2; one end of the resistor R1 is simultaneously connected with the pin 2 of the common mode inductor L1 and the pin 13 of the chip U1, and the other end of the resistor R1 is connected with one end of the resistor R2;
one end of the resistor R2 connected with the resistor R1 is also connected with the pin 11 of the chip U1 and one end of the capacitor C4, and the other end of the capacitor C4 is grounded; the other end of the resistor R2 is connected with the pin 12 of the chip U1 and the pin 3 of the common mode inductor L1 at the same time.
The CAN read circuit includes: a chip U1; the pin 10 of the chip U1 is connected with the power supply VBAT and is simultaneously connected with one end of the resistor R3, and the other end of the resistor R3 is connected with the pin 9 of the chip U1.
The power supply activation circuit 5 includes: capacitance C1, capacitance C2, capacitance C3, magnetic bead FB1; the pin 2 of the chip U1 is grounded, the pin 3 of the chip U1 is connected with one end of the capacitor C1, the capacitor C2 and the magnetic bead FB 1at the same time, the other ends of the capacitor C1 and the capacitor C2 are grounded, the other ends of the magnetic bead FB1 are connected with a 5V power supply and one end of the capacitor C3 at the same time, and the other ends of the capacitor C3 are grounded; the pin 5 of the chip U1 is connected with a 3.3V power supply;
the pin 7 of the chip U1 is used for being connected to an enabling pin of an external power supply, outputting a low level when no CAN signal is active on the vehicle, closing all external power supplies, and only the CAN transceiver chip keeps standby current at the moment to realize low-power standby; when the CAN message is arranged on the CAN bus, the pin 7 outputs high level, and activates the power supply to start the vehicle-mounted equipment.
The principle of the utility model is as follows:
the utility model comprises the following steps: the device comprises an electrostatic protection circuit 1, a filter circuit 2, a terminal matching circuit 3, a CAN reading circuit 4 and a power supply activation circuit 5 which are connected in sequence;
the CAN line connected with the vehicle body is subjected to electrostatic protection and then is supplied to a signal filtering part, clutter interference is suppressed, then the filtered CAN signal terminal is matched, the hidden level on the bus is stabilized, the CAN signal is read after the processing steps, an effective signal is read, a power supply activating signal is sent to activate a power supply, and the vehicle-mounted equipment CAN start to work.
The pin 7 power supply enable output pin of the chip U1 in the circuit is used for being connected to an enable pin of an external power supply, when no CAN signal is active on the vehicle, a low level is output, all external power supplies are closed, and only the CAN transceiver chip has very weak standby current at the moment, so that ultra-low power consumption standby is realized; only when CAN message is provided on the CAN bus, the pin 7 outputs high level, and activates the power supply to start the vehicle-mounted equipment.
The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the description of the present utility model and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the present utility model.
Claims (6)
1. The circuit for realizing low-power consumption wake-up by using the integrated CAN chip is characterized by comprising an electrostatic protection circuit (1), a filter circuit (2), a terminal matching circuit (3), a CAN reading circuit (4) and a power supply activating circuit (5) which are connected in sequence;
the static protection circuit (1) outputs CAN signals after carrying out static treatment on CAN lines connected with a vehicle body, the filter circuit (2) filters the CAN signals to inhibit clutter interference, the terminal matching circuit (3) matches the filtered CAN signals and stabilizes the hidden level on a bus, the CAN reading circuit (4) reads the CAN signals output by the terminal matching circuit (3), and when the CAN signals are read to high level signals, a power supply activating signal is sent to the power supply activating circuit (5) to activate a power supply, and vehicle-mounted equipment CAN start to work;
the CAN reading circuit (4) is realized by adopting an integrated chip U1;
the power supply activation circuit (5) includes: capacitance C1, capacitance C2, capacitance C3, magnetic bead FB1;
the pin 2 of the chip U1 is grounded, the pin 3 of the chip U1 is connected with one end of the capacitor C1, the capacitor C2 and the magnetic bead FB1,
the other ends of the capacitor C1 and the capacitor C2 are grounded, the other end of the magnetic bead FB1 is simultaneously connected with a 5V power supply and one end of the capacitor C3, and the other end of the capacitor C3 is grounded;
the pin 5 of the chip U1 is connected with a 3.3V power supply;
the pin 7 of the chip U1 is used for being connected to an enabling pin of an external power supply, outputting a low level when no CAN signal is active on the vehicle, closing all external power supplies, and only the CAN transceiver chip keeps standby current at the moment to realize low-power standby; when the CAN message is arranged on the CAN bus, the pin 7 outputs high level, and activates the power supply to start the vehicle-mounted equipment.
2. Circuit for realizing low power consumption wake-up using an integrated CAN chip according to claim 1, characterized in that the electrostatic protection circuit (1) comprises: an antistatic tube ED1;
two wires CAN_ H, CAN _L of the CAN signal are respectively connected with a pin 1 and a pin 2 of the antistatic tube ED1, and a pin 3 of the antistatic tube ED1 is grounded.
3. Circuit for realizing low power consumption wake-up using an integrated CAN chip according to claim 1, characterized in that the filter circuit (2) comprises: a common mode inductance L1;
the pin 1 and the pin 4 of the common-mode inductor L1 are respectively connected with the pin 1 and the pin 2 of the anti-static tube ED 1.
4. The circuit for realizing low power consumption wake-up using an integrated CAN chip according to claim 1, wherein the terminal matching circuit (3) comprises: a resistor R1 and a resistor R2;
one end of the resistor R1 is simultaneously connected with the pin 2 of the common mode inductor L1 and the pin 13 of the chip U1, and the other end of the resistor R1 is connected with one end of the resistor R2;
one end of the resistor R2 connected with the resistor R1 is also connected with the pin 11 of the chip U1 and one end of the capacitor C4, and the other end of the capacitor C4 is grounded;
the other end of the resistor R2 is connected with the pin 12 of the chip U1 and the pin 3 of the common mode inductor L1 at the same time.
5. The circuit for realizing low-power consumption wake-up by using the integrated CAN chip according to claim 1, wherein the pin 10 of the chip U1 is connected with a power supply VBAT and is simultaneously connected with one end of a resistor R3, and the other end of the resistor R3 is connected with the pin 9 of the chip U1.
6. The circuit for realizing low power consumption wake-up using an integrated CAN chip of claim 1, wherein the chip U1 model is: SIT1043 or NCA1043.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320349259.1U CN219287492U (en) | 2023-02-17 | 2023-02-17 | Circuit for realizing low-power consumption awakening by using integrated CAN chip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320349259.1U CN219287492U (en) | 2023-02-17 | 2023-02-17 | Circuit for realizing low-power consumption awakening by using integrated CAN chip |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219287492U true CN219287492U (en) | 2023-06-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320349259.1U Active CN219287492U (en) | 2023-02-17 | 2023-02-17 | Circuit for realizing low-power consumption awakening by using integrated CAN chip |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219287492U (en) |
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2023
- 2023-02-17 CN CN202320349259.1U patent/CN219287492U/en active Active
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