SD card loading circuit

Abstract

The utility model discloses an SD card loading circuit, and relates to the technical field of memories. The SD card loading circuit comprises a plurality of dial switches, a plurality of switching circuits and a plurality of switching circuits, the first change-over switch chip is electrically connected with one dial switch; the plurality of second change-over switch chips are electrically connected with the first change-over switch chip respectively and are electrically connected with the plurality of dial switches; the plurality of SD card main controllers are electrically connected with the plurality of second change-over switch chips respectively; and the SD card slot is arranged on the first change-over switch chip. According to the utility model, the problems that when a plurality of main chips are placed on one PCB, a plurality of SD card slots need to be placed under normal conditions, but the space of a board card is limited, and the plurality of SD card slots cannot be placed, so that a plurality of main chip programs cannot be loaded, and the cost is also increased are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of memory, in particular to an SD card loading circuit. Background Art

[0002] SD card (Secure Digital card) is a non-volatile storage device for storing data. It is widely used in various electronic devices such as cameras, mobile phones, tablets and portable media players.

[0003] Currently, one main chip needs to use one SD card for program loading. Therefore, when multiple main chips are placed on a PCB, multiple SD card slots are normally required. However, the board space is limited and multiple SD card slots cannot be placed, which results in the inability to load multiple main chip programs and increases the cost. Currently, no effective solution has been proposed for the above problems. Utility Model Content

[0004] Purpose of the utility model: to provide an SD card loading circuit to at least solve one of the problems existing in the above-mentioned prior art.

[0005] Technical solution: An SD card loading circuit, comprising:

[0006] Several DIP switches;

[0007] A first switching switch chip, electrically connected to the dip switch;

[0008] A plurality of second switch chips, electrically connected to the first switch chips respectively, and electrically connected to a plurality of the dip switches;

[0009] A plurality of SD card main controllers are electrically connected to the plurality of the second switch chips respectively; and

[0010] An SD card slot, disposed on the first switch chip;

[0011] Among them, the dial signals are sent to the corresponding first switching switch chip and the second switching switch chips respectively through the plurality of the dial switches, and the first switching switch chips and the second switching switch chips send control signals according to the feedback dial signals to control the actions of the plurality of the SD card main controllers.

[0012] Preferably, the number of the plurality of dip switches is three, and the number of the plurality of second switching switch chips is two.

[0013] Preferably, the first switching switch chip and a plurality of the second switching switch chips are cascaded.

[0014] Preferably, the pins of the plurality of DIP switches are electrically connected to the pins of the first switching switch chip and the pins of the plurality of second switching switch chips respectively.

[0015] Preferably, the pins of the first switching switch chip are electrically connected to the pins of several second switching switch chips respectively.

[0016] Preferably, the pins of the SD card slot are electrically connected to the pins of the first switching switch chip respectively.

[0017] Preferably, the model of the first switching switch chip and the plurality of the second switching switch chips is MAX4948ETG+.

[0018] Preferably, it further comprises: a power supply circuit, wherein the power supply circuit is electrically connected to the dip switch, the first switching switch chip and a plurality of the second switching switch chips respectively.

[0019] Preferably, the device further comprises: a microcontroller, wherein the microcontroller is electrically connected to the first switching switch chip and the plurality of the second switching switch chips respectively.

[0020] Preferably, the number of the plurality of SD card main controllers is four, and the four SD card main controllers are electrically connected to the two second switching switch chips in groups of two.

[0021] Beneficial effect: In the embodiment of the present application, a control switching switch is adopted, and the dial signals are sent to the corresponding first switching switch chip and the second switching switch chips respectively through the plurality of the dial switches. The plurality of the first switching switch chips and the plurality of the second switching switch chips send control signals according to the feedback dial signals to control the actions of the plurality of the SD card main controllers, thereby achieving the purpose of switching the dial signals, thereby achieving the technical effect of loading multiple main chip programs using only one SD card slot, thereby solving the problem that when multiple main chips are placed on a PCB, multiple SD card slots are normally required to be placed, but the board space is limited and multiple SD card slots cannot be placed, resulting in the inability to load multiple main chip programs, and the technical problem of increased cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the SD card loading circuit structure of the utility model;

[0023] Figure 2 It is an electrical schematic diagram of an SD card main controller of an SD card loading circuit of the utility model;

[0024] Figure 3 This is an electrical schematic diagram of a first switching switch chip and a second switching switch chip of an SD card loading circuit of the utility model;

[0025] Figure 4 It is the electrical principle diagram of the DIP switch of the SD card loading circuit of the utility model; and

[0026] Figure 5 The utility model is an electrical schematic diagram of an SD card slot of an SD card loading circuit.

[0027] The accompanying drawings are marked as follows:

[0028] 10. Dip switch;

[0029] 20. A first switching chip;

[0030] 30. A second switching chip;

[0031] 40. SD card main controller;

[0032] 50. SD card slot. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0034] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations 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 necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0035] 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 this utility model can be understood according to specific circumstances.

[0036] 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.

[0037] like Figure 1-5 As shown, the present application relates to an SD card loading circuit. Figure 1 As shown, the SD card loading circuit includes: a plurality of dip switches 10; the dip switch 10 is an address switch used for operation control, which adopts the binary coding principle of 0 / 1, and is usually installed on a circuit board. By manually toggling the switch, the connection state of the circuit can be changed, thereby realizing different functional configurations. In this application, the dip switch 10 is numbered SW2 in the electrical schematic diagram.

[0038] A first switching switch chip 20 is electrically connected to the dip switch 10; the first switching switch chip 20 is a semiconductor device for realizing signal switching and routing in a circuit, and is usually used for switching analog and digital signals, including but not limited to: audio, video, data and power signals, and can achieve a good switching effect, thereby achieving a precise switching control effect. In this application, the first switching switch chip 20 is numbered U11 in the electrical schematic diagram.

[0039] A plurality of second switching switch chips 30 are electrically connected to the first switching switch chips 20, and are electrically connected to a plurality of the dip switches 10; the second switching switch chip 30 is a semiconductor device for realizing signal switching and routing in a circuit, and is usually used for switching analog and digital signals, including but not limited to: audio, video, data and power signals, and can achieve a good switching effect, thereby achieving a precise switching control effect. In this application, the second switching switch chips 30 are numbered U9 and U10 in the electrical schematic diagram.

[0040] Of course, it can also be cascaded with the second switch chip 30 according to usage requirements to further increase the control quantity of the SD card main controller 40, thereby being able to meet the effects of various usage requirements.

[0041] A plurality of SD card host controllers 40 are electrically connected to a plurality of the second switch chips 30 respectively; SD Host refers to the SD card host controller 40 (SD Card Host Controller), which is a hardware component in a computer or other device for communicating and exchanging data with the SD card. The SD Host is mainly responsible for managing the reading and writing operations of the SD card, including initialization, data transmission, and error handling.

[0042] An SD card slot 50 is provided on the first switch chip 20, and can achieve a good SD card insertion effect. In the present application, the SD card slot 50 is numbered MJ1 in the electrical schematic diagram.

[0043] Among them, the DIP switches 10 send the DIP signals to the corresponding first switch chip 20 and the second switch chips 30 respectively, and the first switch chips 20 and the second switch chips 30 send control signals according to the feedback DIP signals to control the actions of the SD card main controllers 40. It can achieve a good electrical signal transmission effect, thereby ensuring a good electrical control effect, and then realize that only one card slot is needed to load the programs of multiple main chips.

[0044] From the above description, it can be seen that the present application achieves the following technical effects:

[0045] In the embodiment of the present application, a control switching switch is adopted, and the dial signals are sent to the corresponding first switching switch chip 20 and the second switching switch chips 30 respectively through the plurality of the dial switches 10. The plurality of the first switching switch chips 20 and the plurality of the second switching switch chips 30 send control signals according to the feedback dial signals to control the actions of the plurality of the SD card main controllers 40, thereby achieving the purpose of switching the dial signals, thereby achieving the technical effect of loading multiple main chip programs using only one SD card slot 50, and further solving the technical problem that when multiple main chips are placed on a PCB, multiple SD card slots 50 are normally required to be placed, but the board space is limited and multiple SD card slots 50 cannot be placed, resulting in the inability to load multiple main chip programs, and the cost is increased.

[0046] Further, the number of the plurality of dip switches 10 is three, and the number of the plurality of second switch chips 30 is two. It can be understood that the effect of controlling multiple SD cards can be achieved.

[0047] Furthermore, the first switch chip 20 and the plurality of second switch chips 30 are cascaded. It can be understood that a good electrical connection effect can be achieved, thereby ensuring a good electrical signal transmission effect between the switch chips.

[0048] Further, the pins of the plurality of dip switches 10 are electrically connected to the pins of the first switch chip 20 and the pins of the plurality of second switch chips 30. It is understandable that the pins of the dip switches 10 can be electrically connected to the pins of the first switch chip 20 and the pins of the plurality of second switch chips 30 through a PCB board, thereby ensuring a stable electrical signal transmission effect between components. As a person skilled in the art, the connection relationship between the pins should be well known.

[0049] Further, the pins of the first switching switch chip 20 are respectively electrically connected to the pins of the second switching switch chips 30. It can be understood that the pins of the first switching switch chip 20 are respectively electrically connected to the pins of the second switching switch chips 30 through the PCB board, thereby ensuring a stable electrical signal transmission effect between components.

[0050] Further, the pins of the SD card slot 50 are respectively electrically connected to the pins of the first switch chip 20. It can be understood that the pins of the SD card slot 50 are respectively electrically connected to the pins of the first switch chip 20 through the PCB board.

[0051] Furthermore, the first switch chip 20 and the plurality of second switch chips 30 are of the type MAX4948ETG+. It is understandable that MAX4948ETG+ is an analog switch chip suitable for a variety of high-performance signal switching applications.

[0052] Furthermore, it also includes: a power supply circuit, which is electrically connected to the dip switch 10, the first switch chip 20 and a plurality of the second switch chips 30. It can be understood that a good power supply effect can be achieved, thereby ensuring the normal operation of the device.

[0053] Furthermore, it also includes: a microcontroller, which is electrically connected to the first switch chip 20 and the plurality of second switch chips 30. It can be understood that a good main control effect can be achieved, thereby ensuring good coordination of various devices.

[0054] Further, the number of the plurality of SD card host controllers 40 is four, and the four SD card host controllers 40 are electrically connected to the two second switching switch chips 30 in pairs. It can be understood that the two second switching switch chips 30 can switch and control the four SD card host controllers 40, thereby achieving a precise selection effect. In the present application, the SD card host controllers (SD HOST) are numbered U25, U26, U27 and U28 in the electrical schematic diagram.

[0055] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings; however, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various equivalent transformations can be made to the technical scheme of the present invention, and these equivalent transformations all belong to the protection scope of the present invention.

Claims

1. SD card loading circuit, characterized in that, include: Several DIP switches; A first switching switch chip, electrically connected to the dip switch; A plurality of second switch chips, electrically connected to the first switch chips respectively, and electrically connected to a plurality of the dip switches; A plurality of SD card main controllers are electrically connected to the plurality of the second switch chips respectively; and An SD card slot, disposed on the first switch chip; Among them, the dial signals are sent to the corresponding first switching switch chip and the second switching switch chips respectively through the plurality of the dial switches, and the first switching switch chips and the second switching switch chips send control signals according to the feedback dial signals to control the actions of the plurality of the SD card main controllers.

2. The SD card loading circuit according to claim 1, characterized in that: The number of the plurality of dip switches is three, and the number of the plurality of second switching switch chips is two.

3. The SD card loading circuit according to claim 2, characterized in that: The first switch chip and a plurality of the second switch chips are cascaded.

4. The SD card loading circuit according to claim 1, characterized in that: The pins of the plurality of DIP switches are electrically connected to the pins of the first switch chip and the pins of the plurality of second switch chips respectively.

5. The SD card loading circuit according to claim 1, characterized in that: The pins of the first switch chip are electrically connected to the pins of a plurality of the second switch chips respectively.

6. The SD card loading circuit according to claim 1, characterized in that: The pins of the SD card slot are electrically connected to the pins of the first switch chip respectively.

7. The SD card loading circuit according to claim 1, characterized in that: The model of the first switch chip and the plurality of the second switch chips is MAX4948ETG+.

8. The SD card loading circuit according to claim 1, characterized in that: Also includes: A power supply circuit is electrically connected to the dip switch, the first switch chip and a plurality of the second switch chips respectively.

9. The SD card loading circuit according to claim 1, characterized in that: Also includes: A microcontroller is electrically connected to the first switch chip and a plurality of the second switch chips respectively.

10. The SD card loading circuit according to claim 2, characterized in that: The number of the plurality of SD card main controllers is four, and the four SD card main controllers are electrically connected to the two second switch chips in groups of two.

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