As an efficient, safe, convenient and practical new information carrier, IC card has been applied to various fields and industries. This paper introduces an IC card automatic refueling system for the management mode of the manual payment and settlement mode of the gas station. The user can hold the fuel card to the oil station at any time to the station. The system is simple and practical.
How the SLE4428 card works
The SLE4428 card is a chip from Siemens. It is cheap, easy to use, has password verification and other functions, and has high data security. The card has a built-in high voltage generator, which can be operated with a working voltage of 2.7~5.5V. It can be directly driven by the I/O port of the MCU. No other peripheral devices are needed, which simplifies the interface circuit.
1. SLE4428 card features
The basic features of the SLE4428 card are as follows: i byte addressing with 1024 X 8-bit EEPROM memory; irrevocable byte write protection, ie the three-wire serial bus protocol cannot be changed after data is solidified: the status is indicated on the data line after programming is completed; At least 10 million erase cycles: at least 10 years data retention period; contact point configuration and serial interface conform to IS07816 standard; 2-byte programmable security code, data can be written only after the security code is verified correctly Card inside.
The pin diagram of the SLE4428 card is shown in Figure 1. The pin function table is shown in Table 1.
2. SLE4428 card operation timing
The SLE4428 card exchanges information with the chip interface through the three-wire serial bus, and the data is converted and the security logic is verified under the unified coordination of the program controller and the clock pulse. The operation timing of the SLE4428 card mainly includes reset and reset acknowledge, command input timing, erase and write timing, erase only or write only timing, read data timing, and PSC verify timing.
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