A wake-up circuit based on FPD-LINK

Abstract

The present invention discloses a wake-up circuit based on FPD-LINK, comprising: an ACC signal generating circuit, an FPDLINK source end, a source end DC-isolating capacitor, an ACC signal receiving circuit, an FPDLINK receiving end, a receiving end DC-isolating capacitor, and a transmission line. The FPDLINK source end is connected to the source end DC-isolating capacitor, and the ACC signal generating circuit is connected to the source end DC-isolating capacitor and the transmission line; the FPDLINK receiving end is connected to the receiving end DC-isolating capacitor, and the ACC signal receiving circuit is connected to the receiving end DC-isolating capacitor and the transmission line. After the FPDLINK source end finishes data transmission, the ACC signal generating circuit pulls down the ACC signal and transmits it to the ACC signal receiving circuit through the transmission line, so that the circuit control system enters a dormant state; after the FPDLINK source end wakes up from the dormant state, the ACC signal generating circuit pulls up the ACC signal and transmits the signal to the ACC signal receiving circuit through the transmission line, so that the circuit control system enters a normal working state. The present invention can reduce system power consumption, save the number of data interface pins, and reduce hardware costs.

Description

Technical Field

[0001] The present invention relates to the field of vehicle-mounted applications, and in particular to a wake-up circuit based on FPD-LINK. Background Art

[0002] In vehicle applications, especially front-end vehicle applications, the FPD LINK device will stop data transmission after the system goes into sleep mode, especially after the vehicle is turned off. To solve this problem, an ACC line (KL15 line) or a CAN data interface is generally added. However, this will bring new problems, namely, the number of interface pins will increase, and the hardware cost will also increase. Summary of the invention

[0003] The embodiment of the present invention provides a wake-up circuit based on FPD-LINK, which can save the number of data interface pins and reduce hardware costs while solving the problem that the FPD-LINK device stops data transmission after the system goes into sleep mode.

[0004] An embodiment of the present invention provides a wake-up circuit based on FPD-LINK, which may include: an FPD-LINK source circuit, a transmission line and an FPD-LINK receiving circuit; the FPD-LINK source circuit and the FPD-LINK receiving circuit are respectively connected to two ends of the transmission line.

[0005] Further, the FPD-LINK source circuit includes an ACC signal generating circuit, an FPD-LINK source terminal and a source terminal DC blocking capacitor;

[0006] The ACC signal generating circuit is respectively connected to one end of the source end DC blocking capacitor and one end of the transmission line; the FPD-LINK source end is connected to the other end of the source end DC blocking capacitor; one end of the source end DC blocking capacitor is connected to the FPD-LINK source end, and the other end is respectively connected to the ACC signal generating circuit and one end of the transmission line.

[0007] Further, the FPD-LINK receiving circuit includes an ACC signal receiving circuit, an FPD-LINK receiving end and a receiving end DC blocking capacitor;

[0008] The ACC signal receiving circuit is respectively connected to one end of the receiving end DC blocking capacitor and one end of the transmission line; the FPD-LINK receiving end is connected to the other end of the receiving end DC blocking capacitor; one end of the receiving end DC blocking capacitor is connected to the FPD-LINK receiving end, and the other end is respectively connected to the ACC signal receiving circuit and one end of the transmission line.

[0009] Furthermore, after the FPD-LINK source ends data transmission, the ACC signal generating circuit pulls down the ACC signal to obtain ACC sleep information, and transmits the ACC sleep information to the ACC signal receiving circuit through the transmission line.

[0010] Furthermore, after the ACC signal receiving circuit receives the ACC sleep information, the control system enters a sleep state.

[0011] Furthermore, when the FPD-LINK source end wakes up from the sleep state, the ACC signal generating circuit pulls up the ACC signal to obtain ACC start information, and transmits the ACC start information to the ACC signal receiving circuit through the transmission line.

[0012] Furthermore, after the ACC signal receiving circuit receives the ACC startup information, the control system enters a working state.

[0013] Furthermore, the transmission line is a differential line or a coaxial line.

[0014] Further, when the transmission line is a differential line, the ACC signal generating circuit and the ACC signal receiving circuit implement single-ended coupling or double-ended coupling through the differential line.

[0015] Further, when the transmission line is a coaxial line, the ACC signal generating circuit and the ACC signal receiving circuit are on a signal line of the coaxial line.

[0016] The beneficial effects of the present invention are as follows: through a wake-up circuit used in conjunction with FPD-LINK, after the vehicle enters sleep mode, that is, after the ACC signal is low, the existing data line of FPD LINK is reused to control the system to enter sleep mode, thereby achieving the purpose of reducing power consumption. While solving the problem that the FPD LINK device stops data transmission after the system enters sleep mode, the number of data interface pins is saved and the hardware cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 1 is a schematic diagram of a wake-up circuit based on FPD-LINK provided in an embodiment of the present invention;

[0019] Figure 21 is a schematic diagram of the structure of another wake-up circuit based on FPD-LINK provided in an embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of sleep and wake-up provided by an embodiment of the present invention;

[0021] Figure 4 It is a structural schematic diagram of differential single-ended coupling in a wake-up circuit based on FPD-LINK provided in an embodiment of the present invention;

[0022] Figure 5 It is a structural schematic diagram of differential double-terminal coupling in a wake-up circuit based on FPD-LINK provided in an embodiment of the present invention;

[0023] Figure 6 It is a structural schematic diagram of coaxial line coupling in a wake-up circuit based on FPD-LINK provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] The terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products or devices.

[0026] In addition, the terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0028] like Figure 1As shown, the wake-up circuit based on FPD-LINK may include at least three parts, namely, FPD-LINK source circuit 1, transmission line 3 and FPD-LINK receiving circuit 2, and FPD-LINK source circuit 1 and FPD-LINK receiving circuit 2 are respectively connected at both ends of transmission line 3. Among them, FPD-LINK source circuit 1 is mainly used to generate a low ACC signal after the vehicle enters the sleep state, and transmit the low ACC signal to FPD-LINK receiving circuit 2 through transmission line 3, so as to control the system to enter the sleep state, thereby achieving the purpose of reducing power consumption.

[0029] In a preferred implementation, Figure 2 As shown, the FPD-LINK source circuit 1 mainly includes an ACC signal generating circuit 11, an FPD-LINK source terminal 12 and a source terminal DC blocking capacitor 13, wherein the ACC signal generating circuit 11 is respectively connected to one end of the source terminal DC blocking capacitor 13 and one end of the transmission line 3; the FPD-LINK source terminal 12 is connected to the other end of the source terminal DC blocking capacitor 13; one end of the source terminal DC blocking capacitor 13 is connected to the FPD-LINK source terminal 12, and the other end is respectively connected to the ACC signal generating circuit 11 and one end of the transmission line 3. The FPD-LINK receiving circuit 2 includes an ACC signal receiving circuit 21, an FPD-LINK receiving terminal 22 and a receiving terminal DC blocking capacitor 23; the ACC signal receiving circuit 21 is respectively connected to one end of the receiving terminal DC blocking capacitor 23 and one end of the transmission line 3; the FPD-LINK receiving terminal 22 is connected to the other end of the receiving terminal DC blocking capacitor 23; one end of the receiving terminal DC blocking capacitor 23 is connected to the FPD-LINK receiving terminal 22, and the other end is respectively connected to the ACC signal receiving circuit 21 and one end of the transmission line 3.

[0030] In the specific implementation, the sleep and wake-up process of ACC signal and FPD LINK is as follows Figure 3 As shown. After the FPD LINK source end 12 finishes data transmission, the system pulls down the ACC signal through the ACC signal generating circuit 11 to obtain ACC sleep information, and transmits the information to the ACC signal receiving circuit 21 through the transmission line 3. After the ACC signal receiving circuit 21 receives the ACC sleep information, the control system enters the sleep state, thereby achieving the purpose of reducing power consumption; when the FPD LINK source end 12 wakes up from the sleep state, the ACC signal generating circuit 11 pulls up the ACC signal to obtain the ACC start signal, and transmits the signal to the ACC signal receiving circuit 21 through the transmission line 3. After the ACC signal receiving circuit 21 receives the ACC start information, the control system enters the normal working state.

[0031] In a preferred implementation, the transmission line 3 may be a differential line or a coaxial line.

[0032] When the transmission line 3 is a differential line, the ACC signal generating circuit 11 and the ACC signal receiving circuit 21 can use the differential line at either end of the differential line or at the same time to achieve the following: Figure 4 and Figure 5 Single-ended coupling or double-ended coupling as shown.

[0033] When the transmission line 3 is a coaxial line, the ACC signal generating circuit 11 and the ACC signal receiving circuit 21 are on the signal line of the coaxial line to realize the following Figure 6 Coaxial line coupling shown.

[0034] In particular, the present application does not impose any restrictions on the data transmission method of the transmission line 3, and any other solutions that reuse the existing data lines of the FPD LINK to save the number of data interface pins are also within the protection scope of the present application.

[0035] In an embodiment of the present invention, a wake-up circuit used in conjunction with FPD-LINK is used to reuse the existing data line of FPD LINK after the vehicle enters sleep mode, i.e., after the ACC signal is low, so as to control the system to enter sleep mode, thereby achieving the purpose of reducing power consumption. While solving the problem that the FPD LINK device stops data transmission after the system enters sleep mode, the number of data interface pins is saved and the hardware cost is reduced.

[0036] The above are all reasonable implementation cases of this patent and are not limited to other new implementation plans of this patent. Any modifications, imitations, equivalent substitutions, improvements, etc. made in accordance with the provisions within the spirit and principles embodied in this patent should be included in the scope of protection of this patent.

Claims

1. A wake-up circuit based on FPD-LINK, characterized in that: include: An FPD-LINK source circuit, a transmission line, and an FPD-LINK receiving circuit; the FPD-LINK source circuit and the FPD-LINK receiving circuit are respectively connected to two ends of the transmission line, wherein the FPD-LINK source circuit generates a low ACC signal after the vehicle enters a dormant state, and transmits the low ACC signal to the FPD-LINK receiving circuit through the transmission line to control the system to enter a dormant state; The FPD-LINK source circuit includes an ACC signal generating circuit, an FPD-LINK source terminal and a source terminal DC blocking capacitor; The ACC signal generating circuit is respectively connected to one end of the source end DC blocking capacitor and one end of the transmission line; the FPD-LINK source end is connected to the other end of the source end DC blocking capacitor; one end of the source end DC blocking capacitor is connected to the FPD-LINK source end, and the other end is respectively connected to the ACC signal generating circuit and one end of the transmission line; The FPD-LINK receiving circuit includes an ACC signal receiving circuit, an FPD-LINK receiving end and a receiving end DC blocking capacitor; The ACC signal receiving circuit is respectively connected to one end of the receiving end blocking capacitor and one end of the transmission line; the FPD-LINK receiving end is connected to the other end of the receiving end blocking capacitor; one end of the receiving end blocking capacitor is connected to the FPD-LINK receiving end, and the other end is respectively connected to the ACC signal receiving circuit and one end of the transmission line; After the FPD-LINK source end finishes data transmission, the ACC signal generating circuit pulls the ACC signal low to obtain ACC sleep information, and transmits the ACC sleep information to the ACC signal receiving circuit through the transmission line; After the ACC signal receiving circuit receives the ACC sleep information, the control system enters a sleep state; When the FPD-LINK source end wakes up from the sleep state, the ACC signal generating circuit pulls up the ACC signal to obtain ACC start information, and transmits the ACC start information to the ACC signal receiving circuit through the transmission line.

2. The wake-up circuit according to claim 1, characterized in that: After the ACC signal receiving circuit receives the ACC start information, the control system enters the working state.

3. The wake-up circuit according to claim 1, characterized in that: The transmission line is a differential line or a coaxial line.

4. The wake-up circuit according to claim 3, characterized in that: When the transmission line is a differential line, the ACC signal generating circuit and the ACC signal receiving circuit implement single-end coupling or double-end coupling through the differential line.

5. The wake-up circuit according to claim 3, characterized in that: When the transmission line is a coaxial line, the ACC signal generating circuit and the ACC signal receiving circuit are on a signal line of the coaxial line.

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