CN220292120U - Analog camera and corresponding vehicle-mounted display module - Google Patents
Analog camera and corresponding vehicle-mounted display module Download PDFInfo
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- CN220292120U CN220292120U CN202322242181.6U CN202322242181U CN220292120U CN 220292120 U CN220292120 U CN 220292120U CN 202322242181 U CN202322242181 U CN 202322242181U CN 220292120 U CN220292120 U CN 220292120U
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Abstract
The utility model discloses an analog camera and a corresponding vehicle-mounted display module, comprising: the device comprises an analog video chip, an image sensor connected with the analog video chip, a memory and a power supply unit; the image sensor comprises a control pin capable of outputting a high level or a low level, and the memory comprises a write protection pin; the control pin is connected with the write protection pin, the power supply unit is connected with the write protection pin, and the power supply unit is used for pulling up the write protection pin; when the control pin outputs a low level, the write protect pin is pulled low. In the utility model, an idle control pin capable of outputting high level or low level is selected from pins of the image sensor to perform write protection control, thereby realizing program burning and write protection in a memory. In default, the memory cannot be written to, so that the data in the memory is prevented from being tampered. When the program is needed, the control pin is controlled to output low level, the write protection pin is pulled down, and the memory can be written to burn the program.
Description
Technical Field
The utility model belongs to the technical field of cameras, and particularly relates to an analog camera and a corresponding vehicle-mounted display module.
Background
The analog video chip of the current analog high-definition camera has no available GPIO (General-purpose input/output) pin to realize the opening and closing of write protection, in order to burn a program, the write protection pin of a memory is usually directly pulled down, so that the memory is always in a writable state, and thus, under a complex vehicle-mounted environment, the data in the memory has great risk of being tampered, and the camera cannot be drawn out.
Disclosure of Invention
Aiming at the defects or improvement demands of the prior art, the utility model provides an analog camera and a corresponding vehicle-mounted display module, which aim to select an idle control pin capable of outputting high level or low level from pins of an image sensor to perform write protection control and realize program burning and write protection in a memory, thereby solving the technical problem that data in the memory of the analog camera is possibly tampered.
To achieve the above object, according to one aspect of the present utility model, there is provided an analog camera including: the device comprises an analog video chip, an image sensor, a memory and a power supply unit, wherein the image sensor, the memory and the power supply unit are connected with the analog video chip;
the image sensor comprises a control pin capable of outputting a high level or a low level, and is used for outputting the low level during a programming procedure; the memory includes a write protect pin;
the control pin is connected with the write protection pin, the power supply unit is connected with the write protection pin, and the power supply unit is used for pulling up the write protection pin so as to start write protection of the memory.
Further, the power supply unit comprises a resistor, one end of the resistor is connected with a voltage source, and the other end of the resistor is connected with the write protection pin.
Further, the resistance value of the resistor is 0.5K-10K, and the precision of the resistor is 1% -5%.
Further, the model of the image sensor is SC120AT, SC1330AT or SC2331AT, and the control pin is the EFSYNC pin of the image sensor.
Further, the model of the memory is GT24C16, and the write protection pin is the WP pin of the memory.
Further, the model of the analog video chip is TP2912.
Further, the analog video chip is connected with the image sensor through an I2C bus so as to communicate; the analog video chip is also connected with the image sensor through a data bus so as to transmit image data.
Further, when the program is needed to be burned, the upper computer is connected with the image sensor through the I2C bus and used for controlling the control pin to output low level.
Further, the image sensor is a visible light sensor or an infrared light sensor.
According to another aspect of the utility model, a vehicle-mounted display module is provided, which comprises the analog camera, the controller and the analog display screen, wherein the analog camera is connected with the controller, and the controller is connected with the analog display screen.
In general, compared with the prior art, the above technical solution conceived by the present utility model has the following beneficial effects: the utility model provides an analog camera and a corresponding vehicle-mounted display module, wherein an idle control pin capable of outputting high level or low level is selected from pins of an image sensor to perform write protection control, so that write protection of a program and a memory is realized. Under the default condition, a write protection pin of the memory is pulled up by the power supply unit, a write protection function is turned on, the memory cannot be subjected to write operation, and data in the memory is prevented from being tampered. When a program is required to be burnt, the control pin is controlled to output a low level, and the write protection pin is pulled down to close the write protection of the memory, so that the memory can be subjected to write operation to burn the program; after the program is burnt, the control pin does not output low level any more, the write protection pin is pulled up again by the power supply unit, and the write protection function is turned on.
Drawings
Fig. 1 is a schematic structural diagram of an analog camera provided by the utility model;
fig. 2 is a schematic structural diagram of an analog camera and an upper computer according to the present utility model;
FIG. 3 is a schematic diagram of another exemplary camera according to the present utility model;
FIG. 4 is a schematic circuit diagram of an image sensor according to the present utility model;
FIG. 5 is a schematic diagram of a circuit structure of a memory according to the present utility model;
fig. 6 is a schematic circuit diagram of an analog video chip according to the present utility model;
fig. 7 is a schematic circuit diagram of a vehicle-mounted display module according to the present utility model.
Detailed Description
The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model. In addition, the technical features of the embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.
Example 1:
under the practical application scene, the camera divide into digital camera and analog camera, and digital camera includes digital video chip, can control opening and closing of memory write protection through the GPIO mouth of control digital video chip, can not have the risk that data was tampered. However, the cost of the serializer and the coaxial connector matched with the digital camera is higher, and based on the cost consideration, an analog camera with lower cost is also used in actual use; on the other hand, if the analog display screen is an analog scheme, the camera outputs to the controller, and the controller outputs analog image signals to the analog display screen, so that the corresponding camera can also select an analog camera.
However, the analog video chip of the analog high-definition camera does not have available GPIO pins to realize the opening and closing of write protection, in order to ensure that the memory can burn programs, the write protection pins of the memory are usually pulled down directly, so that the memory is always in a writable state, and in a complex vehicle-mounted environment, the data in the memory is tampered with great risk, so that the camera cannot be shown.
Referring to fig. 1, in order to solve the foregoing problem, the present embodiment provides an analog camera, including: the device comprises an analog video chip, an image sensor, a memory and a power supply unit, wherein the image sensor, the memory and the power supply unit are connected with the analog video chip; the image sensor comprises a control pin capable of outputting a high level or a low level, and is used for outputting the low level during a programming procedure; the memory includes a write protect pin; the control pin is connected with the write protection pin, the power supply unit is connected with the write protection pin, and the power supply unit is used for pulling up the write protection pin so as to start write protection of the memory; when the program is needed, the control pin outputs low level, and the write protection pin is pulled low to turn off the write protection of the memory.
Wherein, the memory is EEPROM. The image sensor is a visible light image sensor, an infrared image sensor, or other type of image sensor. The analog video chip is used for displaying the image information acquired by the image sensor in a video stream mode.
In actual use, as shown in fig. 2, when a burning program is needed, the upper computer is connected with the image sensor through the I2C bus, and is used for controlling the control pin to output a low level.
Wherein the low level is none, and the low level is 0V or near 0V. The specific value of the high level is determined based on the voltage input to the image sensor, the voltage values on different circuits are different, and if the circuit is a circuit with 5V power supply, the high level refers to 5V or close to 5V; if a 3V powered circuit, the high level refers to 3V or near 3V.
In this embodiment, one free control pin capable of outputting a high level or a low level is selected from the pins of the image sensor, and write protection control is performed. Under the default condition, a write protection pin of the memory is pulled up by the power supply unit, a write protection function is turned on, the memory cannot be subjected to write operation, and data in the memory is prevented from being tampered. When a program is required to be burnt, the control pin is controlled to output a low level, and the write protection pin is pulled down to close the write protection of the memory, so that the memory can be subjected to write operation to burn the program; after the program is burnt, the control pin does not output low level any more, the write protection pin is pulled up again by the power supply unit, and the write protection function is turned on.
In one embodiment, as shown in fig. 3, the power supply unit includes at least one resistor, one end of which is connected to a voltage source (i.e., VCC of fig. 3), and the other end of which is connected to the write-protect pin. Optionally, the resistance value of the resistor is 0.5K-10K, the precision of the resistor is 1% -5%, the resistor can also be other resistance values, and the resistor is specific according to the actual situation and is not particularly limited herein. Alternatively, the voltage source may be a power supply device, where the power supply device is a voltage stabilizing device or a voltage reducing device, an input terminal of the power supply device is connected to an external power source (such as a battery), and an output terminal of the voltage source is connected to one end of the resistor. Alternatively, the voltage source may come directly from an external power source.
In an alternative embodiment, the power supply unit further comprises an RC filter unit to filter the voltage signal.
In one embodiment, the model of the image sensor is SC120AT, SC1330AT, or SC2331AT, and the control pin is the EFSYNC pin of the image sensor. The EFSYNC pin is an idle pin of the image sensor, and can output high and low levels. In practical use, the EFSYNC pin defaults to a high level and, upon receipt of a control signal, outputs a low level to pull down the write protect pin of the memory.
Here, the control pin is essentially a pin capable of outputting a low level, and any one of the idle pins capable of outputting a low level is selected as the control pin for the image sensor.
Furthermore, the analog video chip is connected with the image sensor through an I2C bus so as to communicate; the analog video chip is also connected with the image sensor through a data bus so as to transmit image data.
In one embodiment, the memory is GT24C16, and the write protect pin is the WP pin of the memory.
In one embodiment, the model number of the analog video chip is TP2912.
Taking the model of the image sensor as SC120AT as an example, the pin distribution and the corresponding peripheral circuit diagram of the image sensor are illustrated, as shown in FIG. 4, MD 2P/D0-MD 2P/D7 are used for transmitting image data, and MD 2P/D0-MD 2P/D7 are connected with an analog video chip for transmitting 8-bit image data. FSYNC and MCN/LREF are also connected with the analog video chip and are used for line-field synchronous signals; the MCP/PLCK is connected with the analog video chip and is used for transmitting pixel clock signals. The EFSYNC pin is connected to a write protect pin of the memory. Other pin distributions and corresponding peripheral circuit diagrams are shown in fig. 4, and are not described herein. MD 2P/D0-MD 2P/D7, FSYNC, MCN/LREFMCP/PLCK are data buses on the image sensor side.
The pin layout and corresponding peripheral circuit diagram of the memory is described herein with the memory model GT24C16 as an example, and the memory includes a WP pin as a write protect pin, which is connected to the EFSYNC pin and also connected to the power supply unit, as shown in fig. 5. Other pin distributions and corresponding peripheral circuit diagrams are shown in fig. 4, and are not described herein.
Taking the model TP2912 of the analog video chip as an example for describing the pin distribution and the corresponding peripheral circuit diagram of the analog video chip, as shown in FIG. 6, YD 0-YD 7 are used for transmitting image data, YD 0-YD 7 are connected with the analog video chip, and FVLDI and LVLDI are also connected with the analog video chip and used for line field synchronous signals; other pin distributions and corresponding peripheral circuit diagrams are shown in fig. 4, and are not described herein.
In practical use, in order to prevent the data in the memory from being tampered, the write protection pin of the memory is required to pull up the 1K resistor by default, so that the memory is in a write protection state by default; when the program is burnt, in order to enable the program to be burnt into a memory, write protection needs to be closed, a write protection pin is required to be connected to a synchronizing pin EFSYNC of an image sensor on hardware, so that when the program is burnt, the image sensor outputs a low-level pull-down WP pin (write protection pin) through the synchronizing pin EFSYNC, after the program is burnt, the synchronizing pin EFSYNC does not output the low level any more, the WP pin is pulled up again by a power supply unit, the WP pin is rewritten to be in a high level, the effect of write protection is achieved, and data is prevented from being tampered in the subsequent loading use process.
Example 2:
based on the foregoing embodiment 1, this embodiment provides a vehicle-mounted display module, including the analog camera, the controller and the analog display screen described in embodiment 1, where the analog camera is connected with the controller, and the controller is connected with the analog display screen. Wherein the analog display screen is an analog display screen.
The analog camera includes: the device comprises an analog video chip, an image sensor, a memory and a power supply unit, wherein the image sensor, the memory and the power supply unit are connected with the analog video chip; the image sensor comprises a control pin capable of outputting a high level or a low level, and the memory comprises a write protection pin; the control pin is connected with the write protection pin, the power supply unit is connected with the write protection pin, and the power supply unit is used for pulling up the write protection pin so as to start write protection of the memory; when the program is needed, the control pin outputs low level, and the write protection pin is pulled low to turn off the write protection of the memory.
In actual use, when a program is required to be burnt, the upper computer is connected with the image sensor through the I2C bus and used for controlling the control pin to output low level.
For the specific structure of the analog camera, please refer to embodiment 1, and the detailed description is omitted herein.
In this embodiment, one free control pin capable of outputting a high level or a low level is selected from the pins of the image sensor, and write protection control is performed. Under the default condition, a write protection pin of the memory is pulled up by the power supply unit, a write protection function is turned on, the memory cannot be subjected to write operation, and data in the memory is prevented from being tampered. When the program is needed to be burnt, the control pin is controlled to output low level, the write protection pin is pulled down to close the write protection of the memory, and the memory can be written to burn the program.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the utility model and is not intended to limit the utility model, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the utility model are intended to be included within the scope of the utility model.
Claims (10)
1. An analog camera, comprising: the device comprises an analog video chip, an image sensor, a memory and a power supply unit, wherein the image sensor, the memory and the power supply unit are connected with the analog video chip;
the image sensor comprises a control pin capable of outputting a high level or a low level, and is used for outputting the low level during a programming procedure; the memory includes a write protect pin;
the control pin is connected with the write protection pin, the power supply unit is connected with the write protection pin, and the power supply unit is used for pulling up the write protection pin so as to start write protection of the memory.
2. An analog camera head according to claim 1, wherein the power supply unit comprises a resistor, one end of the resistor being connected to a voltage source, and the other end of the resistor being connected to the write-protect pin.
3. The analog camera according to claim 2, wherein the resistance of the resistor is 0.5K to 10K, and the precision of the resistor is 1% to 5%.
4. The analog camera head according to claim 1, wherein the model of the image sensor is SC120AT, SC1330AT or SC2331AT, and the control pin is EFSYNC pin of the image sensor.
5. The analog camera head according to claim 1, wherein the memory is GT24C16, and the write protect pin is a WP pin of the memory.
6. The analog camera head according to claim 1, wherein the analog video chip is of a model TP2912.
7. The analog camera head according to claim 1, wherein the analog video chip and the image sensor are connected by an I2C bus for communication; the analog video chip is also connected with the image sensor through a data bus so as to transmit image data.
8. The analog camera according to claim 1, wherein when a programming program is required, the upper computer is connected to the image sensor through an I2C bus, and is configured to control the control pin to output a low level.
9. The analog camera head according to claim 1, wherein the image sensor is a visible light sensor or an infrared light sensor.
10. A vehicle-mounted display module, characterized by comprising an analog camera, a controller and an analog display screen according to any one of claims 1-9, wherein the analog camera is connected with the controller, and the controller is connected with the analog display screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322242181.6U CN220292120U (en) | 2023-08-18 | 2023-08-18 | Analog camera and corresponding vehicle-mounted display module |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202322242181.6U CN220292120U (en) | 2023-08-18 | 2023-08-18 | Analog camera and corresponding vehicle-mounted display module |
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| CN220292120U true CN220292120U (en) | 2024-01-02 |
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| CN202322242181.6U Active CN220292120U (en) | 2023-08-18 | 2023-08-18 | Analog camera and corresponding vehicle-mounted display module |
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