CN210804388U - Hot plug detection circuit and electronic equipment - Google Patents
Hot plug detection circuit and electronic equipment Download PDFInfo
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- CN210804388U CN210804388U CN201922416161.XU CN201922416161U CN210804388U CN 210804388 U CN210804388 U CN 210804388U CN 201922416161 U CN201922416161 U CN 201922416161U CN 210804388 U CN210804388 U CN 210804388U
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Abstract
The utility model provides a hot plug detection circuitry and electronic equipment relates to the technical field that the circuit detected, and this hot plug detection circuitry includes: the device comprises a controller and a switch circuit, wherein the switch circuit is connected with a detection interface of the controller and comprises a triode; the base electrode of the triode is connected with the monitoring pin of the external card slot and used for generating a conducting signal according to the insertion signal of the monitoring pin and sending the conducting signal to the controller; the controller is used for detecting the external card slot according to the conducting signal; the hot plug state of the external card slot can be detected by utilizing the controller, the complexity of a circuit is reduced, the increase of cost is reduced, and the utilization rate of a port of the controller is improved.
Description
Technical Field
The utility model belongs to the technical field of the circuit detects technique and specifically relates to a hot plug detection circuitry and electronic equipment is related to.
Background
An SD (Secure Digital Memory Card) Memory Card is a new generation of Memory devices based on a semiconductor flash Memory, and is widely used in portable devices, such as a car recorder, a Digital camera, a personal Digital assistant, and a multimedia player, due to its excellent characteristics of small size, fast data transmission speed, hot-pluggable, and the like.
However, many existing circuits supporting the SD card hot plug require a memory or a control chip capable of supporting the SD card hot plug to be selected, which not only increases the complexity of the circuit, but also increases the design cost.
SUMMERY OF THE UTILITY MODEL
In view of the above, an object of the present invention is to provide a hot plug detection circuit and an electronic device, so as to alleviate the above technical problems.
In a first aspect, an embodiment of the present invention provides a hot plug detection circuit, wherein the hot plug detection circuit includes: the device comprises a controller and a switch circuit, wherein the switch circuit is connected with a detection interface of the controller and comprises a triode; the base electrode of the triode is connected with the monitoring pin of the external card slot and used for generating a conducting signal according to the insertion signal of the monitoring pin and sending the conducting signal to the controller; the controller is used for detecting the external card slot according to the conducting signal.
In combination with the first aspect, an embodiment of the present invention provides a first possible implementation manner of the first aspect, wherein the triode is a PNP type triode.
With reference to the first aspect, embodiments of the present invention provide a second possible implementation manner of the first aspect, where the switch circuit further includes a first resistor; the base electrode of the triode is connected with the monitoring pin through the first resistor.
With reference to the second possible implementation manner of the first aspect, an embodiment of the present invention provides a third possible implementation manner of the first aspect, wherein the switch circuit further includes a pull-up resistor; the base electrode of the triode is connected with an external power supply through a pull-up resistor; the emitter of the triode is connected with an external power supply.
In combination with the third possible implementation manner of the first aspect, an embodiment of the present invention provides a fourth possible implementation manner of the first aspect, where a resistance value of the first resistor is 1 kilo-ohm, and a resistance value of the pull-up resistor is 1 kilo-ohm.
With reference to the first possible implementation manner of the first aspect, an embodiment of the present invention provides a fifth possible implementation manner of the first aspect, wherein the switch circuit further includes a voltage dividing circuit; the collector of the triode is connected with the controller through the voltage division circuit.
With reference to the fifth possible implementation manner of the first aspect, the present invention provides a sixth possible implementation manner of the first aspect, wherein the voltage dividing circuit includes a second resistor and a third resistor connected in series; the second resistor and the third resistor form a series branch, one end of the series branch is connected with a collector of the triode, and the other end of the series branch is connected with the ground; and a detection interface of the controller is arranged on a connecting circuit of the second resistor and the third resistor.
With reference to the sixth possible implementation manner of the first aspect, an embodiment of the present invention provides a seventh possible implementation manner of the first aspect, wherein the resistances of the second resistor and the third resistor are both 33 kohms.
With reference to the first aspect, an embodiment of the present invention provides an eighth possible implementation manner of the first aspect, wherein the hot plug detection circuit further includes a plug-in board; the controller and the switch circuit are both arranged on the plug-in board.
In a second aspect, an embodiment of the present invention further provides an electronic device, wherein the electronic device is provided with an external card slot, and the electronic device is configured with the above-mentioned hot plug detection circuit; wherein, the monitoring pin of the external card slot is connected with the hot plug detection circuit.
The embodiment of the utility model provides a following beneficial effect has been brought:
the embodiment of the utility model provides a pair of hot plug detection circuitry and electronic equipment, this hot plug detection circuitry includes: the device comprises a controller and a switch circuit, wherein the switch circuit is connected with a detection interface of the controller and comprises a triode; the base electrode of the triode is connected with the monitoring pin of the external card slot and used for generating a conducting signal according to the insertion signal of the monitoring pin and sending the conducting signal to the controller; the controller is used for detecting the external card slot according to the conducting signal; the hot plug state of the external card slot can be detected by utilizing the controller, the complexity of a circuit is reduced, the increase of cost is reduced, and the utilization rate of a port of the controller is improved.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a hot plug detection circuit according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a hot plug detection circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another hot plug detection circuit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Icon:
100-a controller; 101-a switching circuit; 102-a triode; 103-a detection interface; 200-monitoring pins; 201-an external power supply; 300-a voltage divider circuit; 400-an electronic device; 401-external card slot; 402-hot plug detection circuit.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by the skilled in the art without creative work belong to the protection scope of the present invention.
The SD memory card has the advantages that the SD memory card can ensure the safety of digital file transmission and is easy to reformat, so that the SD memory card has wide application fields, and multimedia files such as music, movies, news and the like can be conveniently stored in the SD memory card.
At present, SD memory cards are mostly used for walkmans, digital video cameras, digital cameras, etc., and their projection area is the same as that of MMC (Multimedia Card), but is slightly thicker, 2.1mm, but the capacity of SD memory cards is much larger, and the read/write speed is 4 times faster than that of MMC cards. Meanwhile, the interface of the SD memory card is compatible with the MMC card, and the interface supporting the SD memory card mostly supports the MMC card, and thus, is widely used in portable devices.
However, the MCU (Micro Control Unit) chip used in many circuit designs for detecting the SD card cannot support the hot plug function, and a memory or an upstream device is required to provide a plug-in signal to implement the hot plug function, which not only increases the complexity of the circuit, but also increases the design cost.
Based on this, the embodiment of the utility model provides a pair of hot plug detection circuitry and electronic equipment can alleviate above-mentioned technical problem.
For the convenience of understanding the present embodiment, a hot plug detection circuit disclosed in the embodiments of the present invention is first described in detail.
The first embodiment is as follows:
the embodiment of the utility model provides a hot plug detection circuitry, like the schematic diagram of a hot plug detection circuitry's that fig. 1 is shown, this hot plug detection circuitry of should preventing includes: the controller 100 and the switch circuit 101, wherein the switch circuit is connected to the detection interface 103 of the controller, and the switch circuit includes a transistor 102.
Specifically, a base electrode of the triode is connected with a monitoring pin of the external card slot and used for generating a conducting signal according to an inserting signal of the monitoring pin and sending the conducting signal to the controller; the controller is used for detecting the external card slot according to the conducting signal.
During specific implementation, the external card slot is a standard card slot which has a detection function and can be inserted into an SD memory card, wherein a monitoring pin of the card slot with the detection function can monitor whether the SD memory card is inserted into the card slot or not, and the monitoring pin is connected with a base electrode of a triode in the switch circuit; and the collector of the triode is connected with the detection interface of the controller.
Specifically, when an SD card is inserted into the card slot, the monitoring pin is grounded, at this time, the insertion signal is at a low level, the triode is turned on due to the base current, and the conduction signal is sent to the detection interface of the controller, where the conduction signal is at a high level, and when the controller detects that the conduction signal at the high level is present, it indicates that the SD memory card is inserted into the external card slot; when the SD memory card is pulled out or is not inserted into the external card slot, the monitoring pin is in a suspended state, the triode is cut off due to no base current, a high-level conducting signal is not generated at the collector of the triode and is sent to the controller, and the controller detects that the collector of the triode is at a low level, so that the SD memory card is pulled out or the SD memory card is not inserted into the external card slot. In this embodiment, the controller may determine the hot plug status of the SD card according to different levels at the detection interface.
The embodiment of the utility model provides a pair of hot plug detection circuitry, this hot plug detection circuitry includes: the device comprises a controller and a switch circuit, wherein the switch circuit is connected with a detection interface of the controller and comprises a triode; the base electrode of the triode is connected with the monitoring pin of the external card slot and used for generating a conducting signal according to the insertion signal of the monitoring pin and sending the conducting signal to the controller; the controller is used for detecting the external card slot according to the conducting signal; the hot plug state of the external card slot can be detected by utilizing the controller, the complexity of a circuit is reduced, the increase of cost is reduced, and the utilization rate of a port of the controller is improved.
Specifically, the above-mentioned controller is usually a Central Processing Unit (CPU) of the whole hot plug detection circuit, and can configure a corresponding operating system, and control interfaces, and the like, and specifically, can be a single chip microcomputer, a DSP (Digital Signal Processing), an ARM (Advanced RISC machine, ARM processor), and the like, which can be used for a Digital logic controller of an automation control, and can load a control instruction to a memory at any time for storage and execution, and meanwhile, can be internally provided with a CPU instruction and a data memory, an input/output Unit, a power module, a Digital analog Unit, and the like, and specifically can be set according to an actual use condition, which is not limited by the embodiment of the present invention.
In practical use, the triode is a PNP type triode. Specifically, the triode is a current control element, a PN junction formed between the emitter region and the base region is referred to as an emitter junction, and a PN junction formed between the collector region and the base region is referred to as a collector junction.
Generally, there are two common types of transistors according to materials: the triode works in an amplification area, an emitter junction of the triode is in forward bias, a collector junction of the triode is in reverse bias, collector current is controlled by base current, and the ratio of the variation of the collector current to the variation of the base current is called AC current amplification multiple of the triode. In the embodiment, the PNP triode is connected to the detection interface of the controller and the monitoring pin of the external card slot, so that the controller detects the external card slot by detecting the voltage at the collector of the PNP triode; the PNP transistor is a transistor formed by 2P-type semiconductors and 1N-type semiconductor sandwiched therebetween, and can also be described as a transistor in which current flows from an emitter.
In practical use, the switch circuit further comprises a first resistor; the base electrode of the triode is connected with the monitoring pin through the first resistor. For easy understanding, fig. 2 shows a schematic diagram of a hot plug detection circuit, as shown in fig. 2, a first resistor R1 is connected to a base of a triode, in this embodiment, the PNP triode is connected to the monitoring pin 200 of the external card slot through the first resistor, wherein the resistance of the first resistor R1 is 1 kohm.
As shown in fig. 2, the switching circuit further includes a pull-up resistor R2; the base of the triode is connected with an external power supply 201 through a pull-up resistor; the emitter of the triode is connected with an external power supply.
In a specific implementation, since the high level and the low level of the output state have uncertainty, in order to make the circuit state correct, a pull-up resistor is usually required to be installed, so as to stabilize the uncertain circuit state. In this embodiment, as shown in fig. 2, the base of the diode is connected to the external power supply 201 by a pull-up resistor R2, wherein the voltage of the external power supply is +3.3V, and in actual use, the emitter of the transistor is further connected to the external power supply of +3.3V, wherein the value of the pull-up resistor R2 is 1 kilo-ohm.
In specific application, fig. 3 shows a schematic structural diagram of another hot plug detection circuit, and as shown in fig. 3, the switch circuit further includes a voltage divider circuit 300; the collector of the triode is connected with the controller through the voltage division circuit.
For convenience of illustration, as shown in fig. 2, the voltage dividing circuit includes a second resistor R3 and a third resistor R4 connected in series; the second resistor and the third resistor form a series branch, one end of the series branch is connected with a collector of the triode, and the other end of the series branch is connected with the ground; the detection interface 103 of the controller is arranged on the connection path of the second resistor and the third resistor.
Preferably, one end of the second resistor R3 is connected to the collector of the triode, the other end of the second resistor R3 is connected to the detection interface 103 and one end of the third resistor R4, and the other end of the third resistor R4 is connected to ground, wherein the resistances of the second resistor R3 and the third resistor R4 are both 33 kohms.
In specific implementation, the monitoring pin is grounded when the SD card is inserted into the card slot, so that base current flows through a base electrode of the triode, the triode is in a conducting state, and when the triode is conducted, the controller detects that the level at the detection interface is high level; when the SD memory card is pulled out or is not inserted into the external card slot, the monitoring pin is in a suspended state, the triode is cut off due to no base current, and the controller detects that the level at the detection interface is a low level, so that the controller can judge the hot plug state of the SD memory card by detecting the voltage at the detection interface; by using the hot plug detection circuit in the embodiment, the hot plug state of the SD memory card can be detected without additionally adding a memory or providing an insertion signal by an upstream device, so that the cost is saved, and the port utilization rate of the controller can be increased.
Specifically, the hot plug detection circuit further comprises a plug-in board; the controller and the switch circuit are both arranged on the plug-in board.
In practical use, the package Board may be a Printed Circuit Board (PCB), which is also called a Printed Circuit Board, and is an important electronic component, a support of the electronic component, and a carrier for electrical connection of the electronic component. At present, the printed board is developed from a single layer to double-sided, multi-layer and flexible, and still maintains the respective development trend. Due to the continuous development towards high precision, high density and high reliability, the volume is continuously reduced, the cost is reduced, and the performance is improved, so that the printed board still keeps strong vitality in the development engineering of future electronic equipment.
Specifically, after the electronic device adopts the printed board, because of the consistency of the printed boards of the same type, errors of manual wiring are avoided, automatic insertion or mounting, automatic tin soldering and automatic detection of electronic components can be realized, the quality of the electronic device is ensured, the labor productivity is improved, the cost is reduced, and the maintenance is convenient, so that the controller and the switch circuit are arranged on the plug-in board in the embodiment.
Example two:
an embodiment of the present invention further provides an electronic device, and fig. 4 shows a schematic structural diagram of an electronic device, as shown in fig. 4, wherein the electronic device 400 is provided with an external card slot 401, and the electronic device is configured with the above hot plug detection circuit 402; wherein, the monitoring pin 200 of the external card slot is connected with the hot plug detection circuit.
The embodiment of the utility model provides an electronic equipment, the hot plug detection circuitry who provides with above-mentioned embodiment has the same technical characteristic, so also can solve the same technical problem, reaches the same technological effect.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process of the electronic device described above may refer to the corresponding process in the foregoing hot plug detection circuit embodiment, and is not described herein again.
In addition, in the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases for those skilled in the art.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element 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 invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Finally, it should be noted that: the above embodiments are only specific embodiments of the present invention, and are not intended to limit the technical solution of the present invention, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: those skilled in the art can still modify or easily conceive of changes in the technical solutions described in the foregoing embodiments or make equivalent substitutions for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A hot plug detection circuit, comprising: the detection circuit comprises a controller and a switching circuit, wherein the switching circuit is connected with a detection interface of the controller and comprises a triode;
the base electrode of the triode is connected with a monitoring pin of the external card slot and used for generating a conducting signal according to an inserting signal of the monitoring pin and sending the conducting signal to the controller;
the controller is used for detecting the external card slot according to the conducting signal.
2. The hot plug detection circuit of claim 1, wherein the transistor is a PNP transistor.
3. The hot plug detect circuit of claim 1, wherein the switching circuit further comprises a first resistor;
and the base electrode of the triode is connected with the monitoring pin through the first resistor.
4. The hot plug detect circuit of claim 3, wherein the switching circuit further comprises a pull-up resistor;
the base electrode of the triode is connected with an external power supply through the pull-up resistor;
and the emitter of the triode is connected with the external power supply.
5. The hot plug detection circuit of claim 4, wherein the first resistor has a resistance of 1 kilo-ohm and the pull-up resistor has a resistance of 1 kilo-ohm.
6. The hot plug detect circuit of claim 2, wherein the switch circuit further comprises a voltage divider circuit;
and the collector electrode of the triode is connected with the controller through the voltage division circuit.
7. The hot plug detection circuit of claim 6, wherein the voltage divider circuit comprises a second resistor and a third resistor connected in series;
the second resistor and the third resistor form a series branch, one end of the series branch is connected with a collector of the triode, and the other end of the series branch is connected with the ground;
and the detection interface of the controller is arranged on a connecting circuit of the second resistor and the third resistor.
8. The hot plug detect circuit of claim 7, wherein the second resistor and the third resistor each have a resistance of 33 kohms.
9. The hot plug detect circuit of claim 1, further comprising a board;
the controller and the switch circuit are both arranged on the plug-in board.
10. An electronic device, wherein the electronic device is provided with an external card slot, and the electronic device is provided with the hot plug detection circuit according to any one of claims 1 to 9;
and the monitoring pin of the external card slot is connected with the hot plug detection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922416161.XU CN210804388U (en) | 2019-12-27 | 2019-12-27 | Hot plug detection circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922416161.XU CN210804388U (en) | 2019-12-27 | 2019-12-27 | Hot plug detection circuit and electronic equipment |
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| Publication Number | Publication Date |
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| CN210804388U true CN210804388U (en) | 2020-06-19 |
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| CN201922416161.XU Expired - Fee Related CN210804388U (en) | 2019-12-27 | 2019-12-27 | Hot plug detection circuit and electronic equipment |
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| CN (1) | CN210804388U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112181123A (en) * | 2020-09-28 | 2021-01-05 | 苏州浪潮智能科技有限公司 | Device and method for improving output current sharing of hot-plug chip |
| CN114389247A (en) * | 2022-01-17 | 2022-04-22 | 苏州联讯仪器有限公司 | Hot plug protection device, method, equipment and medium |
| CN114487916A (en) * | 2020-11-13 | 2022-05-13 | 纬颖科技服务股份有限公司 | Detection circuit and illegal removal detection method thereof |
| CN114500854A (en) * | 2022-02-28 | 2022-05-13 | 浙江水晶光电科技股份有限公司 | Camera module, control method of camera module and camera communication system |
-
2019
- 2019-12-27 CN CN201922416161.XU patent/CN210804388U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112181123A (en) * | 2020-09-28 | 2021-01-05 | 苏州浪潮智能科技有限公司 | Device and method for improving output current sharing of hot-plug chip |
| CN112181123B (en) * | 2020-09-28 | 2022-07-12 | 苏州浪潮智能科技有限公司 | Device and method for improving output current sharing of hot-plug chip |
| CN114487916A (en) * | 2020-11-13 | 2022-05-13 | 纬颖科技服务股份有限公司 | Detection circuit and illegal removal detection method thereof |
| CN114389247A (en) * | 2022-01-17 | 2022-04-22 | 苏州联讯仪器有限公司 | Hot plug protection device, method, equipment and medium |
| CN114500854A (en) * | 2022-02-28 | 2022-05-13 | 浙江水晶光电科技股份有限公司 | Camera module, control method of camera module and camera communication system |
| CN114500854B (en) * | 2022-02-28 | 2023-11-28 | 浙江水晶光电科技股份有限公司 | Camera module, control method of camera module and camera communication system |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
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Granted publication date: 20200619 Termination date: 20201227 |