The Smartcards which are contact-afflicted, can either be memory cards or processing cards.

Memory Cards are only able to save data, processing cards have a small additionl operating system. That system can garantee a higher security.

Memory Cards are available in all different types and of different suppliers. That way we can come up to all needs and requests concerning necessary memory capacity or used functions. The I²C Chip doesn't have a write protection. The smallest and most common memory capacity for I²C Cards is 2kbit (256 byte), the largest 256kbit (16 kbyte)

The SLE 4442 Chip offers a write protection by giving a PIN. This means that card-data can only be written after verifing the PIN.