A smart card, chip card, or integrated circuit card, is a pocket-sized card with embedded integrated circuits. Described by ISO 7816 standard. Used in cellular phones, pay TVs, ATM cards, etc.
There are two broad categories of ICCs. Memory cards contain only non-volatile memory storage components, and perhaps dedicated security logic. Microprocessor cards contain volatile memory and microprocessor components.
| Pin | Name | Description |
|---|---|---|
| 1 | VCC | +5 VDC power supply input (optional use by the card) |
| 2 | RESET | Either used itself (reset signal supplied from the interface device) or in combination with an interal reset control circuit (optional use by the card). If internal reset is implemented, the voltage supply on Vcc is mandatory |
| 3 | CLOCK | Clocking or timing signal (optional use by the card) |
| 4 | GND | Ground (reference voltage) |
| 5 | Vpp | Programing voltage input (optional). This contact may be used to supply the voltage required to program or to erase the internal non-volatile memory. |
| 6 | I/O | Input or Output for serial data to the integrated circuit inside the card |
| 7 | I/O or N/C | Input or Output for data or not connected |
| 8 | AS or N/C | Application specific or not connected |
The dialogue between the interface device and the the card shall be conducted through the consecutive operations:
- connection and activation of the contacts by the interface device
- reset of the card
- answer to reset by the card
- subsequent information exchange between the card and the interface device
- deactivation of the contacts by the interface device
Interfacing smart card isn't a simple task. Links in the following source(s) section leads to description of signals, timings, etc.
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