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ISO 7816 [part 1]
[part 2] [part 3]
[part4]
ISO 7816 part 2 defines the dimensions and location of the contacts. This
part includes standards about number, function and position of the electrical
contacts.
The integrated circuit card (ICC) has 8 electrical contacts. They are
referred to as C1 through C8. However, not all 8 contacts are electrically
connected to the embedded microprocessor chip and therefore remain unused.
The following table contains the contact definition according to ISO7816-2:
| Contact |
Designation |
Use |
| C1 |
Vcc |
Power connection through which operating power is supplied
to the microprocessor chip in the card |
| C2 |
RST |
Reset line through which the IFD can signal to the
smart card's microprocessor chip to initiate its reset sequence of
instructions |
| C3 |
CLK |
Clock signal line t hrough which a clock signal can
be provided to the microprocessor chip. This line controls the operation
speed and provides a common framework for data communication between
the IFD and the ICC |
| C4 |
RFU |
Reserved for future use |
| C5 |
GND |
Ground line providing common electrical ground between
the IFD and the ICC |
| C6 |
Vpp |
Programming power connection used to program EEPROM
of first generation ICCs. |
| C7 |
I/O |
Input/output line that provides a half-duplex communication
channel between the reader and the smart card |
| C8 |
RFU |
Reserved for future use |
NOTE: Some smart cards issued before 1990 were adherent to a different standard
for the contact location and therefore can't be used with today's ISO7816-2
compliant smart card readers. These cards were deployed primarily in Europe.
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