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IC Card Reader

IC card and card connector

X76F100 for the 128 × 8-bit serial confidentiality FLASH E2PROM, which read and write passwords passwords, respectively 64. Figure 2 for smart card Smart Card package pin map. The chip is packaged in a card, IC card into the card reader of the card connector, the reader can read and write it to achieve encryption, inquiries, deposits, withdrawals and other functions.

IC card connector has 8 pins, when the X76F100Y insertion precisely connected with these pins. There are also two fixed end, where a fixed-side with the card connector on a leaf spring connected to two contacts, and is equivalent to a normally closed reed switch. When the card is not inserted, the reed is closed, P3.2 pin to maintain low; when the card is inserted, the reed was the top open, P3.2 pin becomes high. When the microcontroller detects changes P3.2 feet high, through the RST pin P1.3 to X76F100 become high, it reset.

Microcontroller

Microcontroller using LG's GMS97C52. It has 8K bytes of ROM, 256 bytes of RAM and 32 I / O port, P1 port and serial device X25045 and X76F100 connections, P0, P2 port for the keyboard and display, P3 for the mouth P3.2 Detection of IC card is inserted and the remaining seven ports, can be used for other functions to expand.

Supervisory Circuit

Supervisory Circuit with X25045 chip, which includes a watchdog timer, voltage monitoring circuitry, and E2PROM memory. Its functions are: the power-down when GMS97C52 generate RESET signal; watchdog to monitor the system and prevent crashes.

Keyboard Circuit

For convenience, the keyboard interface circuit with the I / O port implementation, which has 4 × 4 structure, 16 keys. In which the number keys 11, function keys 4, Enter 1.

Numeric keys: 0,1,2,3,4,5,6,7,8,9, (backspace).

Function keys: Query , Storage, withdrawal -, change password *.

Queries : Users can search by reading the password stored in the card amount.

Storage: users passwords can be stored in the card.

Withdrawal : users write passwords withdrawals from the card.

Change password : password is divided into reading and writing change password. For your convenience, so that read and write password 1 passwords

Delivered, click here to read keys will also change your password and write password.

Enter: 8-bit passwords or access shall confirm the number of input end, and the end to confirm the new password entered.

Display Circuit

Showing part of the adoption of LED displays, also used the I / O port implementation. Used to display system status, enter the password or the amount you want to access, and error information. The drive current is limited due to GMS97C52 at P0, P2 members plus reversers SN74F04, increase drive capability. It is inhaled current 64mA, the output current is 15mA, can guarantee the

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IC Card Reader