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USB-IC card

A USB-IC, USB interface technology, applied in the field of computer peripheral equipment, can solve the problems of unsuitability for IC cards, poor versatility and high cost, and achieve the effects of simple and reliable hardware structure, strong versatility and low production cost

Inactive Publication Date: 2005-03-02
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Various existing cards are generally dedicated to special cards and require special card reading equipment, which has poor versatility; the USB protocol is a widely used industrial standard, and popular U disks use this communication protocol, which has good versatility, but U disk is generally used as a large-capacity storage device, the cost is high, and it is not suitable for use as an IC card

Method used

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Embodiment Construction

[0020] The present invention is further described below by way of embodiment and accompanying drawing.

[0021] The hardware will be described in detail first.

[0022] (1) figure 1 The power generation circuit of the USB interface circuit shown in the figure generates power to supply power to other circuits, and provides a USB differential signal channel for the microcontroller EM78P156ELP to communicate with the computer. GJ1 is a USB socket, the 1st pin is the USB ground, the 2nd pin is the USB data line DP, the 3rd pin is the USB data line DN, and the 4th pin is the USB 5V power line. Light-emitting diode LP1 is connected between pin 4 of J1 and signal VCC. The voltage drop of the light-emitting diode is about 1.6 volts, starting from the 4-pin 5 volt power supply, the VCC is about 3.4 volts, which is used to drive the rest of the circuit. We choose the rest of the components so that they operate between 2.7 volts and 3.6 volts. R3 is a 1.5KΩ pull-up resistor, one end...

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Abstract

The invention is an USB-IC card, which is an USB with a few data storing ability. The invention uses 8 bits embedded microchip EM78P156ELP to control and read the small volume memory chip AT24CXX, thus the data can be reserved for a long time; the invention realizes low speed USB 1.1 protocol with EM78P156ELP compilation instruction, thus it has USB communication function; The invention founds an industrial standard for controlling USB-IC card, the data in card is transparent, and the coding algorithm is different. The developer may realize application in each industry according to the industrial standard, such as: ticket and tax management, military electron code, and so on. The hardware structure is simple and reliable, and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of computer peripheral equipment, and in particular relates to a USB-IC card. Background technique [0002] Classical Chinese philosophy emphasizes the peaceful coexistence between man and nature, and emphasizes "doing nothing and doing everything". In the current background of computer network technology, it can be understood as follows: a webpage is selectively created for some individuals in the production practice, and the webpage contains some content and descriptions for easy understanding; Additions and deletions and their descriptions. Therefore, from birth to extinction, the change track of individual content is left behind. The objectivity of this kind of record can be understood as "doing nothing"; the trajectory of individual changes is very useful, which can be understood as "doing nothing". [0003] Various existing cards are generally dedicated to special cards and require special card read...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/06G06F13/10G06K19/07
Inventor 张德志
Owner FUDAN UNIV