What is ISO smart card? Smart Cards are defined in a standard called ISO 7816. This has different sections that cover physical size and characteristics, where the contacts should be (for contact cards) and how to communicate with them.

ISO 7816 does not define the electronics and a smart card can have just a memory chip, or more likely nowadays, a microcontroller and a memory chip. The standard does define how data should be read/written to the memory, using serial communications. This is often called “Phoenix” mode in discussions about smart cards. A second communication protocol uses a clock and is known as Smart Mouse.

The Smart Card Programmer we sell supports both these modes, so can be described as supporting ISO 7816 smart cards. These cards are used for telephone cards, bus passes, door entry and all sorts of applications, but for obvious reasons such cards are often encrypted and do not allow writes.

Simple smart cards that just contain memory are available, for example Infineon SLE5528 with 1024 bytes of memory and a 32 bit protection memory, to prevent unauthorised writes. The DLLs that come with the smart card programmer support these cards, and the developers SDK gives lots of examples in C++. Even simpler cards that just contain a 24C64 EEPROM can be supported by the DLL in the smart card programmer.

As well as these generic ISO 7816 smart cards, there are cards based on AVR and PIC microcontrollers, known as Gold card, Silver card, Yellow card, Fun card etc. The smart card programmer reads and writes the EEPROM chip on these cards by programming code into the PIC or AVR microcontroller that will read or write to the EEPROM chip on the card i.e. access to EEPROM memory is not direct but is done by the microcontroller.

More smart cards at www.smartcardrfidtag.com.

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