Smart Card (Sim Card) interface pinout

Described by ISO 7816 standard. Used in cellular phones, pay TVs, etc.

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
7,8	N/C	not used

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
• desactivation 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.