There are many types of smartcards. Phonecards are one type of
smart-cards. Generally, a smart-card is any type of pocket-sized
card (like credit cards) with an embedded chip on one side. This
chip is actually a microcontroller with a non-volatile memory of
specific size. Pinout configuration of telecard smart-cards
First of all, let's see the pinout of those phonecards. If you
take a closer look to the parallelogram chip, you will notice
that there are lines which separates the surface into 6 or 8
areas: Each one of these areas is a pin used either to provide
power to the embedded microcontroller, or to interface this
microcontroller with the outside world. For the telecards, these
pins are: 1: VCC, the 5 volts supply for the microcontroller 4:
Reserved for Future Use 6: VPP, programming voltage (5 or 21
volts if NMOS card) 7: I/O pin 8: Reserved for Future Use Short
description: Number 1 and 5 are for the chip's power supply,
which is 5 volts. Number 3 and 7 are the clock and data pins for
the interface: By