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8 pin SMARTCARD proprietary of Smart Card (SIM Card) interface connector layout
8 pin SMARTCARD proprietary connector
at the card
at the card
A smart card, chip card, or integrated circuit card, is a pocket-sized card with embedded integrated circuits. Described by ISO7816 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. A smart card, chip card, or integrated circuit card (ICC) is any pocket-sized card with embedded integrated circuits.

Smart cards can provide identification, authentication, data storage, strong security authentication for single sign-on (SSO) and application processing. 

Physical, electrical and other characteristic of Smart cards are described by the ISO/IEC 7810 and ISO/IEC 7816 series of standards.

Smart Card (SIM Card) pinout

Pin Name Description
C1 VCC +5 VDC power supply input (optional use by the card)
C2 RESET Reset signal, used to reset the card's communications. 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
C3 CLOCK Provides the card with a clock signal, from which data communications timing is derived
C4 RESERVED AUX1, optionally used for USB interfaces and other uses.
C5 GND Ground (reference voltage)
C6 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. ISO/IEC 7816-3:1997 designated this as a programming voltage: an input for a higher voltage to program persistent memory (e.g., EEPROM). ISO/IEC 7816-3:2006 designates it SPU, for either standard or proprietary use, as input and/or output.
C7 I/O Input or Output for serial data (half-duplex) to the integrated circuit inside the card. 
C8 RESERVED AUX2, optionally used for USB interfaces and other uses.

Please note that there are great variations in connector shape:

Image from Wikipedia:

 

The dialogue between the interface device and the the card shall be conducted through the consecutive operations:

Interfacing smart card isn't a simple task. Here is the Smart card to PC interface adapter cable scheme.

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