CN210807244U

CN210807244U - SIM card hot plug circuit of mobile unit wireless communication

Info

Publication number: CN210807244U
Application number: CN202020122974.8U
Authority: CN
Inventors: 谢文广; 程加钢; 柳星
Original assignee: Shenzhen Jhctech Development Co ltd
Current assignee: Shenzhen Jhctech Development Co ltd
Priority date: 2020-01-19
Filing date: 2020-01-19
Publication date: 2020-06-19
Anticipated expiration: 2030-01-19

Abstract

The utility model provides a mobile unit wireless communication's SIM card hot plug circuit, including power module, SIM card communication module, SIM draw-in groove module, protection module, wherein, SIM card communication module links to each other with power module and SIM draw-in groove module respectively, SIM draw-in groove module links to each other with protection module, SIM draw-in groove module is equipped with the interface that links to each other with the SIM card. The utility model has the advantages that: the circuit is simple, response speed is fast, and the convenience of mobile unit has greatly been promoted.

Description

SIM card hot plug circuit of mobile unit wireless communication

Technical Field

The utility model relates to a SIM card communication circuit especially relates to a mobile unit wireless communication's SIM card hot plug circuit.

Background

With the rapid development of global economy, the automobile industry has also gained rapid development, and the traditional vehicle-mounted equipment can realize the functions of common audio-visual entertainment, navigation and the like; there is an increasing demand for in-vehicle devices to provide wireless communication. However, the current SIM card for wireless communication generally does not support hot plug function, so that the user is not very convenient when using the SIM card, and the SIM card needs to be plugged into the vehicle-mounted device to use the vehicle-mounted device normally after being turned off.

Therefore, the design of the 4G LTE SIM card with the hot plug function becomes another trend of the vehicle-mounted industry, and the technology has positive significance for improving the vehicle-mounted convenience and improving the experience of users.

SUMMERY OF THE UTILITY MODEL

For solving the problem among the prior art, the utility model provides a mobile unit wireless communication's SIM card hot plug circuit.

The utility model discloses a power module, SIM card communication module, SIM draw-in groove module, protection module, wherein, SIM card communication module links to each other with power module and SIM draw-in groove module respectively, SIM draw-in groove module links to each other with protection module, SIM draw-in groove module is equipped with the interface that links to each other with the SIM card.

The utility model discloses make further improvement, power module's input termination the mobile unit's mainboard, by the mobile unit's mainboard is got the electricity, power module includes more than one electric capacity.

The utility model discloses make further improvement, SIM card communication module is the 4G module.

The utility model discloses do further improvement, the 4G module includes the 4G interface, the 4G interface is equipped with reserves PCIE signal pin and USB signal pin, and the 4G module of compatible USB interface communication and the 4G module of PCIE interface communication still are equipped with and support SMBUS pin and system reset signal pin.

The utility model discloses make further improvement, the 4G interface is the 4G module of PCIE interface communication,

7, 39, 41, 2, 24, 52 of 4G interface connect the 3.3V power, and

6, 28, 48 connect the 1.5V power,

9, 15, 21, 27, 29, 35, 37, 43, 4, 18, 26, 34, 40, 50 of 4G interface connect power ground, and pin 22 is reserved support SMBUS and system reset signal pin, and

36, 38 are reserved USB signal pin, and

30, 32 are SMBUS pin, and pin 22 is system reset signal pin, and

8, 10, 12, 14, 16, 20, 44 connect the SIM module, wherein, pin 44 is for surveying signal pin, is used for surveying whether there is the SIM card, and

1, 11, 13, 23, 25, 31, 33 are PCIE signal pin, and the mainboard through PCIE bus and on-vehicle equipment links to each other.

The utility model discloses make further improvement, SIM card slot module includes the SIM card interface, pin 1 of SIM card interface connects the pin 8 of 4G interface for power pin to through parallelly connected electric capacity C2281 and C2282 ground connection, pin 2, 10-13 ground connection of SIM card interface, pin 3 are the pin that resets, connect the pin 14 of 4G interface, pin 4 of SIM card interface connects the pin 16 of 4G interface through resistance R2739, pin 5 of SIM card interface is the clock pin, connects the pin 12 of 4G interface to link to each other with grounded capacity C2283, and pin 6 is the IO pin, links to each other with protection module to link to each other with grounded capacity C2280, pin 7, 8 suspension, pin 9 connects the pin 44 of 4G interface.

The utility model discloses make further improvement, protection module is for preventing surge protector U1 of human static, surge protector U1 pin 1 connects the pin 6 of SIM joint interface, surge protector U1 pin 2 ground connection, pin 3 connect the pin 3 of SIM joint interface, surge protector U1 pin 4 connects the pin 9 of SIM joint interface, surge protector U1 pin 5 connects pin 1 of SIM joint interface, surge protector U1 pin 6 connects pin 5 of SIM joint interface.

Compared with the prior art, the beneficial effects of the utility model are that: the circuit is simple, and response speed is fast, has greatly promoted mobile unit's convenience, has promoted on-vehicle user's experience and has felt.

Drawings

FIG. 1 is a block diagram of the present invention;

fig. 2 is a schematic circuit diagram of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

As shown in fig. 1, the utility model discloses a power module, SIM card communication module, SIM draw-in groove module, protection module, wherein, SIM card communication module links to each other with power module and SIM draw-in groove module respectively, SIM draw-in groove module links to each other with protection module, SIM draw-in groove module is equipped with the interface that links to each other with the SIM card.

The host of the vehicle-mounted equipment is electrified, the SIM card access state is detected through the SIM card communication module, the SIM card access and extraction state can be identified under different operating systems of the vehicle-mounted equipment, the SIM card is started to be connected with a wireless network after being accessed, and the network connection is disconnected after the SIM card is extracted, so that the system stability is kept.

As shown in fig. 2, the input terminal of the power module is connected to the motherboard of the vehicle-mounted device, the motherboard of the vehicle-mounted device obtains power, and the power module includes more than one capacitor. The circuit is simple, and the power is directly got from 3.3V and 1.5V of mainboard, has reserved a plurality of electric capacity filtering and has used, and filter capacitor makes the 4G module work of this example more stable, in addition, also can the energy storage to prevent the influence that the outage caused the circuit.

The SIM card communication module of the embodiment is a 4G module. The 4G module comprises 4G interfaces, PCIE signal pins and USB signal pins are reserved on the 4G interfaces of the embodiment, the 4G module compatible with USB interface communication and the 4G module compatible with PCIE interface communication can select a USB type 4G module and can also select a PCIE bus type 4G module, and in addition, SMBUS support pins and system reset signal pins are reserved in the embodiment.

As an embodiment of the present invention, the 4G interface of the present embodiment is a 4G module of PCIE interface communication,

pins

7, 39, 41, 2, 24 and 52 of the 4G interface are connected with a 3.3V power supply,

pins

6, 28 and 48 are connected with a 1.5V power supply,

pins

9, 15, 21, 27, 29, 35, 37, 43, 4, 18, 26, 34, 40, 50 of the 4G interface are connected to a power ground, pin 22 is a reserved pin for supporting an SMBUS bus and a system reset signal,

pins

36, 38 are reserved USB signal pins,

pins

30, 32 are SMBUS bus pins, pin 22 is a system reset signal pin,

pins

8, 10, 12, 14, 16, 20, 44 are connected to a SIM card slot module, the pin 44 is a detection signal pin for detecting whether the SIM card is present, and the

pins

1, 11, 13, 23, 25, 31, and 33 are PCIE signal pins and are connected to the motherboard of the vehicle-mounted device through a PCIE bus.

The principle of hot plug is as follows:

mainly by the hot plug detection signal SIM2_ DET, the 4G module recognizes the presence of the SIM card by calling the high/low level of the SIM2_ DET signal, and when the SIM2_ DET signal is high, it indicates that there is no SIM card, because the SIM2_ DET in the 4G module is pulled up to 1.8V level. When the SIM2_ DET signal is low, indicating the presence of a SIM card, the SIM card socket pulls the SIM2_ DET signal low.

The SIM card slot module of the embodiment comprises a SIM card interface, wherein a pin 1 of the SIM card interface is a power supply pin, is connected with a pin 8 of a 4G interface and is grounded through parallel capacitors C2281 and C2282,

pins

2 and 10 to 13 of the SIM card interface are grounded, a pin 3 of the SIM card interface is a reset pin and is connected with a pin 14 of the 4G interface, a pin 4 of the SIM card interface is connected with a pin 16 of the 4G interface through a resistor R2739, a pin 5 of the SIM card interface is a clock pin and is connected with a pin 12 of the 4G interface and is connected with a grounded capacitor C2283, a pin 6 is an IO pin and is connected with a protection module and is connected with a grounded capacitor C2280, pins 7 and 8 are suspended, and a pin 9 is connected with a pin 44 of the 4G interface.

The SIM2_ PWR pin of the SIM card interface is the power supply of the 4G module to the SIM card. The function of a plurality of capacitors in the SIM card slot module is mainly filtering. In the hot plugging process, static electricity of a human body is possibly driven into the SIM card seat, so that the surge protector U1 is added as an ESD (electrostatic discharge) protection device, the static electricity of 8KV contact and 15KV air discharge can be prevented, and the mainboard can stably run.

Specifically, pin 1 of the surge protector U1 of this example is connected with pin 6 of the SIM card interface, pin 2 of the surge protector U1 is grounded, pin 3 is connected with pin 3 of the SIM card interface, pin 4 of the surge protector U1 is connected with pin 9 of the SIM card interface, pin 5 of the surge protector U1 is connected with pin 1 of the SIM card interface, and pin 6 of the surge protector U1 is connected with pin 5 of the SIM card interface.

The utility model discloses successfully realized the hot plug design of mobile unit 4G LTE wireless network card communication SIM card, the SIM draw-in groove supports the SIM card and inserts and pull out the number of times: 3000 times; misjudgment rate of the SIM card slot: less than 1 ‰; the access starting time of the 4G LTE wireless network card communication SIM card is as follows: less than 5S; SIM card extraction reaction time: less than 0.5S; the SIM card hot plug technology greatly improves the convenience of vehicle-mounted equipment, improves the experience of vehicle-mounted users, can greatly improve the market competitiveness of mass production products, and has wide application prospect in the vehicle-mounted equipment industry and other equipment industries needing 4G network SIM card communication.

The above-mentioned embodiments are the preferred embodiments of the present invention, and the scope of the present invention is not limited to the above-mentioned embodiments, and the scope of the present invention includes and is not limited to the above-mentioned embodiments, and all equivalent changes made according to the present invention are within the protection scope of the present invention.

Claims

1. The utility model provides a mobile unit radio communication's SIM card hot plug circuit which characterized in that: the SIM card communication module is respectively connected with the power module and the SIM card slot module, the SIM card slot module is connected with the protection module, and the SIM card slot module is provided with an interface connected with an SIM card.

2. The SIM card hot plug circuit of the vehicle-mounted device wireless communication of claim 1, wherein: the input end of the power supply module is connected with the mainboard of the vehicle-mounted equipment, the mainboard of the vehicle-mounted equipment obtains electricity, and the power supply module comprises more than one capacitor.

3. The SIM card hot plug circuit of the vehicle-mounted device wireless communication of claim 1, wherein: the SIM card communication module is a 4G module.

4. The SIM card hot plug circuit of claim 3, wherein: the 4G module includes the 4G interface, the 4G interface is equipped with reserves PCIE signal pin and USB signal pin, and compatible USB interface communication's 4G module and PCIE interface communication's 4G module still are equipped with and support SMBUS pin and system reset signal pin.

5. The SIM card hot plug circuit of claim 4, wherein: the 4G interface is a 4G module of PCIE interface communication, pins 7, 39, 41, 2, 24, and 52 of the 4G interface are connected to a 3.3V power supply, pins 6, 28, and 48 are connected to a 1.5V power supply, pins 9, 15, 21, 27, 29, 35, 37, 43, 4, 18, 26, 34, 40, and 50 of the 4G interface are connected to a power ground, pin 22 is a reserved pin for supporting an SMBUS bus and a system reset signal, pins 36 and 38 are reserved USB signal pins, pins 30 and 32 are SMBUS bus pins, pin 22 is a system reset signal pin, pins 8, 10, 12, 14, 16, 20, and 44 are connected to a SIM card slot module, where pin 44 is a detection signal pin for detecting whether a SIM card exists, pins 1, 11, 13, 23, 25, 31, and 33 are PCIE signal pins, and are connected to a motherboard of a vehicle-mounted device through a PCIE bus.

6. The SIM card hot plug circuit of claim 5, wherein: the SIM card slot module comprises a SIM card interface, wherein a pin 1 of the SIM card interface is a power supply pin, a pin 8 of a 4G interface is connected, and is grounded through a parallel capacitor C2281 and a C2282, pins 2, 10-13 and 3 of the SIM card interface are grounded, a reset pin is connected with a pin 14 of the 4G interface, a pin 4 of the SIM card interface is connected with a pin 16 of the 4G interface through a resistor R2739, a pin 5 of the SIM card interface is a clock pin, is connected with a pin 12 of the 4G interface and is connected with a grounded capacitor C2283, a pin 6 is an IO pin, is connected with a protection module and is connected with a grounded capacitor C2280, pins 7 and 8 are suspended, and a pin 9 is connected with a pin 44 of the 4G interface.

7. The SIM card hot plug circuit of claim 6, wherein: protection module is for preventing human static surge protector U1, surge protector U1 pin 1 connects the pin 6 of SIM card interface, surge protector U1 pin 2 ground connection, pin 3 connect the pin 3 of SIM card interface, surge protector U1 pin 4 connects the pin 9 of SIM card interface, surge protector U1 pin 5 connects the pin 1 of SIM card interface, surge protector U1 pin 6 connects the pin 5 of SIM card interface.