CN211719896U - Intelligent USB concentrator based on power chip - Google Patents
Intelligent USB concentrator based on power chip Download PDFInfo
- Publication number
- CN211719896U CN211719896U CN201920388108.0U CN201920388108U CN211719896U CN 211719896 U CN211719896 U CN 211719896U CN 201920388108 U CN201920388108 U CN 201920388108U CN 211719896 U CN211719896 U CN 211719896U
- Authority
- CN
- China
- Prior art keywords
- chip
- control
- usb
- power
- power chip
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Power Sources (AREA)
Abstract
The utility model discloses an intelligent USB concentrator based on a power chip, relating to the field of computer USB communication concentrators; the USB interface driving device comprises a hub protocol control chip, a USB equipment control chip and a power chip with driving and detecting functions, wherein one end of the hub protocol control chip is connected with a main control computer, the other end of the hub protocol control chip is connected with the USB equipment control chip, and the hub protocol control chip, the USB equipment control chip, a power chip control input end and a power chip control output end are sequentially connected to drive a USB interface; the power chip detection end is connected with the main control computer to realize the detection and monitoring of the state of the USB interface; the utility model discloses a power chip realizes drive control and state detection, has solved the current problem that adopts the relay to realize that reliability that USB interface on-off control brought is poor, control accuracy is low, unable detection, has reached the effect of accurate control, regularly detecting the interface state.
Description
Technical Field
The utility model belongs to the technical field of computer USB communication concentrator and specifically relates to an intelligence USB concentrator based on power chip.
Background
Usb (universal Serial bus) is a standard for Serial communication technology for connecting computer systems and external devices, and is also a specification of input/output interfaces. The USB bus technical specification is developed from the initial 1.0 and 2.0 to the current 3.0, the highest theoretical communication rate is full duplex 5Gbps, and the USB bus technology is widely applied to external expansion interfaces of personal computers and mobile equipment due to good compatibility and high-speed transmission capability; under the background, more and more external devices are connected to a main control terminal through a USB bus, and a USB Hub is developed, and the USB Hub is also called a USB Hub and is used for expanding a computer USB interface, so that a computer can provide a plurality of USB interfaces.
During the use process, a user needs to selectively connect or disconnect some USB external devices with the main control device at different times. For example, when a plurality of mobile hard disks are connected to the same USB hub at the same time, the power supply of the upstream port of the USB hub is insufficient; under the existing conditions, the USB external equipment selectively connected and inserted into a port needs manual operation, a hub protocol control chip is adopted to receive an instruction, a drive unit is controlled by the USB equipment control chip, and the drive unit is connected with the hub protocol control chip to control the power on and off of the port, so that the purpose of controlling the power on and off of a USB interface through a main control computer is realized; meanwhile, the computer cannot know the interface connection state, and the debugging efficiency is low and the difficulty is high during the fault. Therefore, there is a need for a USB hub that overcomes the above problems and achieves long-term stable control.
Disclosure of Invention
The utility model aims to provide a: the utility model provides an intelligence USB concentrator based on power chip has solved the current problem that reliability is poor, control accuracy is low that adopts the relay to realize that USB interface on-off control brings.
The utility model adopts the technical scheme as follows:
an intelligent USB concentrator based on a power chip comprises a concentrator protocol control chip, a USB equipment control chip and a power chip with driving and detecting functions, wherein one end of the concentrator protocol control chip is connected with a main control computer, the other end of the concentrator protocol control chip is connected with the USB equipment control chip, and the concentrator protocol control chip, the USB equipment control chip, a power chip control input end and a power chip control output end are sequentially connected to realize driving of a USB interface; and the detection end of the power chip is connected with the main control computer to realize the detection and monitoring of the state of the USB interface.
Preferably, the circuit connection between the power chip and the USB device control chip is as follows:
a pin 3 and a pin INPUT2 of the power chip are connected with a data port 1 of the USB equipment control chip, a pin 5 and a pin INPUT2 of the power chip are connected with a data port 2 of the USB equipment control chip, pins 1 and 12 of the power chip are connected with a power supply VDD, and a pin 11 of the power chip is connected with a chip selection signal of a main control computer;
the data port 3 of the USB device control chip is connected with a pin R149 of a CURRENT SENSE1 of the USB device control chip, the data port 3 of the USB device control chip is further connected with a capacitor C43 and a capacitor C44 which are connected in series, the data port 4 of the device control chip is connected with a pin R of the device control chip, the resistor R149 is connected with a resistor R223 in series and then connected with a resistor R148, the resistor R148 is connected with a capacitor C44, the resistor R223 is also connected with a resistor R227 and then connected with a capacitor C47, the pin 9 and a pin CURRENT SENSE2 of the resistor R150 are connected with a data port 5 of the USB device control chip, and the data port 5 of the USB device control chip is connected with a capacitor C47.
Preferably, the power chip and the hub protocol control chip are connected in circuit as follows:
the 24 pin of the power chip is connected with the port 1 of the concentrator protocol control chip, the 23 pin of the power chip is connected with the port 2 of the concentrator protocol control chip, the 14 pin of the power chip is connected with the port 3 of the concentrator protocol control chip, and the 13 pin of the power chip is connected with the port 4 of the concentrator protocol control chip;
pins 24-19 of the power chip are connected with a capacitor C123, a capacitor C124 is respectively connected with pins 13-18 of the power chip, and the capacitor C123 is connected with a power supply VCC after being connected with the capacitor C124 in parallel.
Preferably, the input end of the concentrator protocol controller chip is connected with the main control computer, the output end of the concentrator protocol controller chip is connected with the input end of the USB equipment control chip, the output end of the USB equipment control chip is connected with the control input end of the power chip, the control output end of the power chip is connected with the concentrator protocol controller chip, and the detection end of the power chip is connected with the main control computer.
Preferably, the hub protocol control chip is connected with a port of a main control computer through an uplink port, one port of the main control computer comprises seven downlink ports, the hub protocol control chip is connected with an input end of a USB device control chip through one downlink port, an output end of the USB device control chip comprises 8 data ports, the data ports are connected with a control input end of a power chip, a control output end of the power chip is connected with a port of the hub protocol control chip, and a detection end of the power chip is connected with the main control computer.
To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that:
1. the utility model discloses a power chip carries out drive control, and the working property of power chip can not reduce because of long-time use, belongs to integrated chip, and control reliability and life are superior to pure relay control in all aspects, have avoided adopting the poor shortcoming of relay control reliability, have solved the problem that the reliability is poor, the control accuracy is low that current adoption relay realizes that USB interface on-off control brings, has reached accurate control, simple and convenient control, simplified control circuit, cost-effective effect;
2. the utility model adopts a power chip which can detect current besides the drive control function, and can acquire the state of a drive object according to the detected current, and is beneficial to monitoring the state of the USB interface according to the detection result, and is beneficial to rapidly debugging and protecting the interface when in fault, and avoiding the fault caused by overcurrent and the like;
drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a control block diagram of the present invention;
fig. 2 is a circuit diagram of the power chip of the present invention;
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The technical problem is as follows: the problem of current adopt the relay to realize that USB interface on-off control brings reliability poor, control accuracy is low is solved.
The technical scheme is as follows:
an intelligent USB concentrator based on a power chip comprises a concentrator protocol control chip, a USB equipment control chip and a power chip with driving and detecting functions, wherein one end of the concentrator protocol control chip is connected with a main control computer, the other end of the concentrator protocol control chip is connected with the USB equipment control chip, and the concentrator protocol control chip, the USB equipment control chip, a power chip control input end and a power chip control output end are sequentially connected to drive a USB interface; the power chip detection end is connected with the main control computer to realize the detection and monitoring of the USB interface state.
The circuit connection of the power chip and the USB equipment control chip is as follows:
a pin 3 and a pin INPUT2 of the power chip are connected with a data port 1 of the USB equipment control chip, a pin 5 and a pin INPUT2 of the power chip are connected with a data port 2 of the USB equipment control chip, pins 1 and 12 of the power chip are connected with a power supply VDD, and a pin 11 of the power chip is connected with a chip selection signal of a main control computer;
the data port 3 of the USB device control chip is connected with a pin R149 of a CURRENT SENSE1 of the USB device control chip, the data port 3 of the USB device control chip is further connected with a capacitor C43 and a capacitor C44 which are connected in series, the data port 4 of the device control chip is connected with a pin R of the device control chip, the resistor R149 is connected with a resistor R223 in series and then connected with a resistor R148, the resistor R148 is connected with a capacitor C44, the resistor R223 is also connected with a resistor R227 and then connected with a capacitor C47, the pin 9 and a pin CURRENT SENSE2 of the resistor R150 are connected with a data port 5 of the USB device control chip, and the data port 5 of the USB device control chip is connected with a capacitor C47.
The circuit connection of the power chip and the hub protocol control chip is as follows:
the 24 pin of the power chip is connected with the port 1 of the concentrator protocol control chip, the 23 pin of the power chip is connected with the port 2 of the concentrator protocol control chip, the 14 pin of the power chip is connected with the port 3 of the concentrator protocol control chip, and the 13 pin of the power chip is connected with the port 4 of the concentrator protocol control chip;
pins 24-19 of the power chip are connected with a capacitor C123, a capacitor C124 is respectively connected with pins 13-18 of the power chip, and the capacitor C123 is connected with a power supply VCC after being connected with the capacitor C124 in parallel.
The input end of the concentrator protocol controller chip is connected with the main control computer, the output end of the concentrator protocol controller chip is connected with the input end of the USB equipment control chip, the output end of the USB equipment control chip is connected with the control input end of the power chip, the control output end of the power chip is connected with the concentrator protocol controller chip, and the detection end of the power chip is connected with the main control computer.
The concentrator protocol control chip is connected with a port of the main control computer through an uplink port, one port of the main control computer comprises seven downlink ports, the concentrator protocol control chip is connected with the input end of the USB equipment control chip through one downlink port, the output end of the USB equipment control chip comprises 8 data ports, the data ports are connected with the control input end of the power chip, the control output end of the power chip is connected with the port of the concentrator protocol control chip, and the detection end of the power chip is connected with the main control computer.
The technical effects are as follows: the utility model discloses a power chip carries out drive control, and the working property of power chip can not reduce because of long-time use, belongs to integrated chip, and control reliability and life are superior to pure relay control in all aspects, have avoided adopting the poor shortcoming of relay control reliability, have solved the problem that the reliability is poor, the control accuracy is low that current adoption relay realizes that USB interface on-off control brings, has reached accurate control, simple and convenient control, simplified control circuit, cost-effective effect; the adopted power chip not only has a drive control function, but also can detect current, the state of a drive object is obtained according to the detected current, the monitoring of the state of the USB interface is facilitated according to the detection result, the quick debugging in the fault process and the protection of the interface are facilitated, and the faults caused by overcurrent and the like are avoided;
the features and properties of the present invention are described in further detail below with reference to examples.
Example 1
An intelligent USB concentrator based on a power chip comprises a concentrator protocol control chip, a USB equipment control chip and a power chip with driving and detecting functions, wherein one end of the concentrator protocol control chip is connected with a main control computer, the other end of the concentrator protocol control chip is connected with the USB equipment control chip, and the concentrator protocol control chip, the USB equipment control chip, a power chip control input end and a power chip control output end are sequentially connected to drive a USB interface; the power chip detection end is connected with the main control computer to realize the detection and monitoring of the USB interface state.
The concentrator protocol control chip is connected with a port of the main control computer through an uplink port, one port of the main control computer comprises seven downlink ports, the concentrator protocol control chip is connected with the input end of the USB equipment control chip through one downlink port, the output end of the USB equipment control chip comprises 8 data ports, the data ports are connected with the control input end of the power chip, the control output end of the power chip is connected with the port of the concentrator protocol control chip, and the detection end of the power chip is connected with the main control computer.
The working principle is as follows: the main control computer sends out an instruction, the concentrator protocol controller chip receives the instruction, the USB equipment control chip is connected with the control input end of the power chip, the control output end of the power chip is connected with the port of the concentrator protocol controller chip, the power on and off of the port are controlled, the purpose of controlling the USB interface to be on and off through the main control computer is achieved, and the output end of the power chip can be connected with other peripheral USB equipment; the detection end of the power chip detects the current of the port, and feeds back the detection result to the main control computer to realize the interface state monitoring. The hub protocol control chip adopts the model of AU9254A21 of Alcor Micro company or ISP1251 of Philips company; the USB equipment control chip adopts the model of CY7C68013a of Cypress company, Net2280 of NetChip company or ISP1583 of Philips company; the power chip model is VND5012 AK; the power supply of the chip adopts 3.3V power supply or 5V power supply, and a corresponding circuit is conventional in the field and is not described herein; the technical scheme of the application can be clearly and completely realized by a person skilled in the art according to the recorded model and the circuit diagram; the utility model discloses a power chip carries out drive control, and power chip's working property can not reduce because of long-time the use, belongs to integrated chip, and control reliability and life aspect are superior to simple relay control, have avoided adopting the poor shortcoming of relay control reliability, have solved the current poor, the low problem of control accuracy of reliability that adopts the relay to realize that USB interface on-off control brings, can detect the interface state simultaneously, have reached the effect of accurate control, detection interface.
Example 2
Based on embodiment 1, this embodiment refines the circuit connection of the power chip, and the circuit connection of the power chip and the USB device control chip is as follows:
a pin 3 and a pin INPUT2 of the power chip are connected with a data port 1 of the USB equipment control chip, a pin 5 and a pin INPUT2 of the power chip are connected with a data port 2 of the USB equipment control chip, pins 1 and 12 of the power chip are connected with a power supply VDD, and a pin 11 of the power chip is connected with a chip selection signal of a main control computer;
the data port 3 of the USB device control chip is connected with a pin R149 of a CURRENT SENSE1 of the USB device control chip, the data port 3 of the USB device control chip is further connected with a capacitor C43 and a capacitor C44 which are connected in series, the data port 4 of the device control chip is connected with a pin R of the device control chip, the resistor R149 is connected with a resistor R223 in series and then connected with a resistor R148, the resistor R148 is connected with a capacitor C44, the resistor R223 is also connected with a resistor R227 and then connected with a capacitor C47, the pin 9 and a pin CURRENT SENSE2 of the resistor R150 are connected with a data port 5 of the USB device control chip, and the data port 5 of the USB device control chip is connected with a capacitor C47.
The circuit connection of the power chip and the hub protocol control chip is as follows:
the 24 pin of the power chip is connected with the port 1 of the concentrator protocol control chip, the 23 pin of the power chip is connected with the port 2 of the concentrator protocol control chip, the 14 pin of the power chip is connected with the port 3 of the concentrator protocol control chip, and the 13 pin of the power chip is connected with the port 4 of the concentrator protocol control chip;
pins 24-19 of the power chip are connected with a capacitor C123, a capacitor C124 is respectively connected with pins 13-18 of the power chip, and the capacitor C123 is connected with a power supply VCC after being connected with the capacitor C124 in parallel.
The detailed connection and value of the circuit are shown in fig. 2, the model of the power chip is VND5012AK, and the model adopted by the hub protocol control chip is CY7C66113 of Cypress corporation; the USB device control chip adopts a model of CY7C68013a of Cypress company. The output end of the USB equipment control chip is connected with an INPUT pin of the power chip, the control output end of the power chip is connected with a port of the concentrator protocol control chip, the on-off of an interface is controlled, the adopted power chip can judge the working state of the interface according to a current detection pin (a CURRT SENSE pin of the power chip) of the power chip, and the detection of the state of the interface is realized. The technical scheme of the application can be clearly and completely realized by a person skilled in the art according to the recorded model and the circuit diagram; the power chip that this application adopted can also detect current except drive control function, acquires the state of drive object according to the electric current that detects, does benefit to control USB interface state according to the testing result, does benefit to quick mistake proofing when the trouble and does benefit to the protection interface, avoids bringing the trouble because of overflowing etc..
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (5)
1. An intelligent USB concentrator based on power chip, including concentrator protocol control chip and USB equipment control chip, its characterized in that: the USB interface control system is characterized by also comprising a power chip with driving and detecting functions, wherein one end of the concentrator protocol control chip is connected with the main control computer, the other end of the concentrator protocol control chip is connected with the USB equipment control chip, and the concentrator protocol control chip, the USB equipment control chip, the power chip control input end and the power chip control output end are sequentially connected to drive the USB interface; and the detection end of the power chip is connected with the main control computer to realize the detection and monitoring of the state of the USB interface.
2. A power chip based intelligent USB hub according to claim 1, wherein: the circuit connection of the power chip and the USB equipment control chip is as follows:
a pin 3 and a pin INPUT2 of the power chip are connected with a data port 1 of the USB equipment control chip, a pin 5 and a pin INPUT2 of the power chip are connected with a data port 2 of the USB equipment control chip, pins 1 and 12 of the power chip are connected with a power supply VDD, and a pin 11 of the power chip is connected with a chip selection signal of a main control computer;
the data port 3 of the USB device control chip is connected with a pin R149 of a CURRENT SENSE1 of the USB device control chip, the data port 3 of the USB device control chip is further connected with a capacitor C43 and a capacitor C44 which are connected in series, the data port 4 of the device control chip is connected with a pin R of the device control chip, the resistor R149 is connected with a resistor R223 in series and then connected with a resistor R148, the resistor R148 is connected with a capacitor C44, the resistor R223 is also connected with a resistor R227 and then connected with a capacitor C47, the pin 9 and a pin CURRENT SENSE2 of the resistor R150 are connected with a data port 5 of the USB device control chip, and the data port 5 of the USB device control chip is connected with a capacitor C47.
3. A power chip based intelligent USB hub according to claim 1, wherein: the power chip and the hub protocol control chip are connected in circuit as follows:
the 24 pin of the power chip is connected with the port 1 of the concentrator protocol control chip, the 23 pin of the power chip is connected with the port 2 of the concentrator protocol control chip, the 14 pin of the power chip is connected with the port 3 of the concentrator protocol control chip, and the 13 pin of the power chip is connected with the port 4 of the concentrator protocol control chip;
pins 24-19 of the power chip are connected with a capacitor C123, a capacitor C124 is respectively connected with pins 13-18 of the power chip, and the capacitor C123 is connected with a power supply VCC after being connected with the capacitor C124 in parallel.
4. A power chip based intelligent USB hub according to any one of claims 1 to 3, wherein: the input end of the concentrator protocol controller chip is connected with the main control computer, the output end of the concentrator protocol controller chip is connected with the input end of the USB equipment control chip, the output end of the USB equipment control chip is connected with the control input end of the power chip, the control output end of the power chip is connected with the concentrator protocol controller chip, and the detection end of the power chip is connected with the main control computer.
5. A power chip based intelligent USB hub according to claim 4, wherein: the concentrator protocol control chip is connected with a port of a main control computer through an uplink port, one port of the main control computer comprises seven downlink ports, the concentrator protocol control chip is connected with the input end of a USB equipment control chip through one downlink port, the output end of the USB equipment control chip comprises 8 data ports, the data ports are connected with the control input end of a power chip, the control output end of the power chip is connected with the port of the concentrator protocol control chip, and the detection end of the power chip is connected with the main control computer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920388108.0U CN211719896U (en) | 2019-03-26 | 2019-03-26 | Intelligent USB concentrator based on power chip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920388108.0U CN211719896U (en) | 2019-03-26 | 2019-03-26 | Intelligent USB concentrator based on power chip |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211719896U true CN211719896U (en) | 2020-10-20 |
Family
ID=72813380
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920388108.0U Expired - Fee Related CN211719896U (en) | 2019-03-26 | 2019-03-26 | Intelligent USB concentrator based on power chip |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211719896U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114329513A (en) * | 2021-11-29 | 2022-04-12 | 苏州浪潮智能科技有限公司 | Device, method and server for limiting external access of physical interface |
-
2019
- 2019-03-26 CN CN201920388108.0U patent/CN211719896U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114329513A (en) * | 2021-11-29 | 2022-04-12 | 苏州浪潮智能科技有限公司 | Device, method and server for limiting external access of physical interface |
| CN114329513B (en) * | 2021-11-29 | 2023-11-03 | 苏州浪潮智能科技有限公司 | Device, method and server for limiting external access of physical interface |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9128691B2 (en) | Method and terminal for selecting internal circuit according to USB interface status | |
| CN103198033A (en) | Apparatus and method of identifying a USB or an MHL device | |
| CN108595356B (en) | Hard disk backboard compatible with RSSD hard disk and NVMe hard disk and method | |
| CN111884646A (en) | Intelligent M-BUS host circuit with photoelectric isolation function and control method | |
| CN211719896U (en) | Intelligent USB concentrator based on power chip | |
| CN203249957U (en) | Multi-path voltage monitoring device | |
| CN204666762U (en) | A kind of cable wire sequence detecting device | |
| CN104216809A (en) | Signal testing device | |
| CN218733305U (en) | Wireless charging device | |
| CN203537553U (en) | An Interface circuit realizing serial port and infrared multiplex functions | |
| CN210465520U (en) | Digital oscilloscope capable of being used in cooperation with smart phone | |
| CN209070033U (en) | It is a kind of at the same be used for single port, the test fixture of dual-port PCIE SSD signal | |
| CN218214118U (en) | Data communication circuit | |
| CN201741037U (en) | Test tool for air conditioner controller | |
| CN219369632U (en) | Circuit for detecting insertion of connector | |
| CN114002491B (en) | Zero detection circuit and clutter detection system | |
| CN219512363U (en) | USB switch chip function test circuit | |
| CN211150968U (en) | Intelligent circuit breaker test interface circuit and intelligent circuit breaker | |
| CN113777990B (en) | Single-line debugging graphic terminal of single-chip microcomputer | |
| CN216285576U (en) | Solid-state relay board card and multichannel voltage signal switching device | |
| CN218729029U (en) | Tool number identification module and tool management system | |
| CN215219002U (en) | Automatic identification circuit for OTG equipment mode | |
| CN219475713U (en) | Current detection circuit, current measurement circuit board and current test electronic equipment | |
| CN213750282U (en) | Power-off detection circuit | |
| CN221406465U (en) | Test management circuit and multi-channel serial port tester |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20201020 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |