CN205486138U

CN205486138U - Card circuit is read to SIM card

Info

Publication number: CN205486138U
Application number: CN201620100017.9U
Authority: CN
Inventors: 林立
Original assignee: Ryd Electronic Technology Co Ltd
Current assignee: Ryd Electronic Technology Co Ltd
Priority date: 2016-02-01
Filing date: 2016-02-01
Publication date: 2016-08-17
Anticipated expiration: 2026-02-01

Abstract

The utility model relates to the field of communication technology, a concretely relates to SIM card read the card circuit, insert detection circuitry, read card circuit, treater, display circuit and wireless communication module including SIM card interface circuit, SIM card, SIM card interface circuit, SIM card insert detection circuitry and read the card circuit and connect gradually, the treater with read card circuit, display circuit and wireless communication module electric connection. The utility model provides a SIM card read the card circuit, simplifies the step that reads of SIM card through designing more reasonable circuit structure to cooperation wireless communication module realizes that it is connected to carry out radio communication with the management end, has greatly improved portable ability, makes things convenient for SIM card internal information's management and backup.

Description

A kind of SIM card reading circuit

Technical field

This utility model relates to communication technical field, is specifically related to a kind of SIM card reading circuit.

Background technology

SIM (Subscriber Identity Module, subscriber identification module) blocks, also referred to as smart card, In SIM, store useful information, key information and user-phone book information etc., be available for communication network to visitor Family identity differentiates.

In prior art, the SIM used by mobile terminal is contact SIM so that move when SIM inserts The sim card slot of dynamic terminal can use, and this sim card slot circuit needs integrated card reading circuit, it is achieved to SIM The reading of internal information, and in order to the data in SIM are managed concentratedly and backed up, then need SIM Blocking external card reader to be read out, card reader in use needs repeatedly to plug, extremely inconvenience.

Utility model content

In order to solve above-mentioned technical problem, this utility model provides the card reading circuit of a kind of SIM, passes through Design more reasonably circuit structure, simplifies the read step of SIM, and coordinates wireless communication module, real Now carry out radio communication with management end to be connected, greatly improve portable performance, facilitate SIM internal information Management and backup.

In order to achieve the above object, this utility model be employed technical scheme comprise that, the Card Reader of a kind of SIM Circuit, including SIM interface circuit, SIM insertion detection circuit, card reading circuit, processor and channel radio Letter module, described SIM interface circuit, SIM insertion detection circuit and card reading circuit are sequentially connected with, and process Device and card reading circuit and wireless communication module are electrically connected with.

Further, SIM interface circuit includes a SIM interface, and described card reading circuit includes that model is The Card Reader chip of AT83C23OK203, the RST foot of SIM interface, CLK foot, I/O foot and two Reserved Foot is directly connected to SIM interface, and the VPP foot of SIM interface is unsettled, and VCC pin accesses power supply, and GND draws Foot ground connection, the CD foot of SIM interface is connected to Card Reader chip by SIM insertion detection circuit.

Further, described SIM insertion detection circuit includes that a NMOS tube, SIM interface CD are drawn Foot is connected to the G pole of NMOS tube by a pull-up resistor R562, and a resistance is passed through in the D pole of NMOS tube R570 is connected to Card Reader chip AT83C23OK203, the S pole ground connection of NMOS tube.

Further, the DVCC pin of Card Reader chip AT83C23OK203 passes through an electric capacity C621 ground connection, LI pin receives VCC pin by L9, and it is direct that XTAL1 and XTAL2 connects crystal oscillator Y10, D-and a D+ It is connected to RK2918.

Further, also include that display circuit, described display circuit are electrically connected with processor.

This utility model, by using technique scheme, compared with prior art, has the advantage that

This utility model, by designing the card reading circuit of brand-new SIM, is realized SIM by SIM interface The plug best identified of card, realizes the intelligence to SIM by SIM insertion detection circuit and card reading circuit Identify, simplify read step, and recognition efficiency is greatly improved, by design processor and radio communication mold Block realizes the data of this SIM are transmitted by cordless communication network, manage and are backed up, and greatly carries The portability of the card reading circuit of high whole SIM and Card Reader efficiency.

Accompanying drawing explanation

Fig. 1 is the structural representation of embodiment of the present utility model.

Fig. 2 is SIM interface circuit, SIM insertion detection circuit and the circuit theory diagrams of card reading circuit.

Detailed description of the invention

In conjunction with the drawings and specific embodiments, this utility model is further illustrated.

As a specific embodiment, as depicted in figs. 1 and 2, a kind of SIM of the present utility model Card reading circuit, including SIM interface circuit 1, SIM insertion detection circuit 2, card reading circuit 3, processes Device 4, wireless communication module 5 and display circuit 6, described SIM interface circuit 1, SIM insert detection Circuit 2 and card reading circuit 3 are sequentially connected with, and processor 4 and card reading circuit 3 and wireless communication module 5 are electrical Connecting, described display circuit 6 is electrically connected with processor 4.Described processor is the process of model RK2918 Device.

In the present embodiment, SIM interface circuit 1 includes that a SIM interface, described card reading circuit 3 include type Number it is the Card Reader chip of AT83C23OK203, the RST foot of SIM interface, CLK foot, I/O foot and two Reserved foot is directly connected to SIM interface, and the VPP foot of SIM interface is unsettled, and VCC pin accesses power supply, GND pin ground connection, the CD foot of SIM interface is connected to Card Reader chip by SIM insertion detection circuit 2. Described SIM insertion detection circuit 2 includes a NMOS tube, and SIM interface CD pin passes through a pull-up Resistance R562 is connected to the G pole of NMOS tube, and the D pole of NMOS tube is connected to Card Reader by a resistance R570 Chip AT83C23OK203, the S pole ground connection of NMOS tube.The DVCC pin of Card Reader chip AT83C23OK203 By an electric capacity C621 ground connection, LI pin receives VCC pin by L9, XTAL1 and XTAL2 connects One crystal oscillator Y10, D-and D+ are directly connected to processor RK2918.

The operation principle of the present embodiment is: when SIM insert SIM interface, the CD foot of SIM interface by Low level becomes high level；Further, by SIM testing circuit 2, SIM card reading circuit 3 receives Level to SIM testing circuit 2 changes, and triggers Card Reader chip AT83C23OK203 work；Further, SIM card reading circuit 3 is obtained SIM data by SIM CLK and SIM I/O by SIM interface circuit 1； Further, the data obtained are passed through USB interface and the place of AT83C23OK203 by SIM card reading circuit 3 Reason device RK2918 data communication, thus realize the editor of SIM data, back up and manage.Radio communication mold The data of SIM are uploaded to background data base by cordless communication network and carry out the backup of data by block, and This wireless communication module receives data and the process order that administrative center sends, and edits SIM data And management.

Although specifically show and describe this utility model in conjunction with preferred embodiment, but the technology of art Personnel should be understood that in the spirit and scope of the present utility model limited without departing from appended claims, This utility model can be made a variety of changes in the form and details, be protection model of the present utility model Enclose.

Claims

1. the card reading circuit of a SIM, it is characterised in that: include that SIM interface circuit, SIM insert inspection Slowdown monitoring circuit, card reading circuit, processor and wireless communication module, described SIM interface circuit, SIM Insertion detection circuit and card reading circuit are sequentially connected with, and processor and card reading circuit and wireless communication module are electrical Connect.

The card reading circuit of a kind of SIM the most according to claim 1, it is characterised in that: SIM interface electricity Road includes a SIM interface, and described card reading circuit includes the Card Reader chip that model is AT83C23OK203, The RST foot of SIM interface, CLK foot, I/O foot and two Reserved feet are directly connected to SIM and connect Mouthful, the VPP foot of SIM interface is unsettled, and VCC pin accesses power supply, and GND pin ground connection, SIM connects The CD foot of mouth is connected to Card Reader chip by SIM insertion detection circuit.

The card reading circuit of a kind of SIM the most according to claim 2, it is characterised in that: described SIM is inserted Entering testing circuit and include a NMOS tube, SIM interface CD pin is by a pull-up resistor R562 even Receiving the G pole of NMOS tube, the D pole of NMOS tube is connected to Card Reader chip by a resistance R570 AT83C23OK203, the S pole ground connection of NMOS tube.

The card reading circuit of a kind of SIM the most according to claim 3, it is characterised in that: Card Reader chip The DVCC pin of AT83C23OK203 passes through an electric capacity C621 ground connection, and LI pin receives VCC by L9 Pin, XTAL1 and XTAL2 connects crystal oscillator Y10, D-and a D+ and is directly connected to RK2918.

The card reading circuit of a kind of SIM the most according to claim 1, it is characterised in that: also include display electricity Road, described display circuit is electrically connected with processor.