AET63 Reference Manual
version 1.8 September 2006
Advanced Card Systems Ltd.
Page 6 of 29
4. Smart Card Interface
The interface between the AET63 and the inserted smart card follows the specifications of
ISO7816-3
with
certain restrictions or enhancements to increase the practical functionality of the AET63.
4.1 Smart Card Power Supply VCC (C1)
The current consumption of the inserted card must not be higher than
50mA
.
4.2 Programming Voltage VPP (C6)
According to ISO 7816-3, the smart card contact C6 (VPP) supplies the programming voltage to the smart
card. Since all common smart cards in the market are EEPROM based and do not require the provision of an
external programming voltage, the contact C6 (VPP) has been implemented as a normal control signal in the
AET63. The electrical specifications of this contact are identical to those of the signal RST (at contact C2).
4.3 Card Type Selection
The controlling PC has to always select the card type through the proper command sent to the AET63 prior
to activating the inserted MCU card.
For MCU-based cards the reader allows to select the preferred protocol, T=0 or T=1. However, this selection
is only accepted and carried out by the reader through the PPS when the card inserted in the reader supports
both protocol types. Whenever an MCU-based card supports only one protocol type, T=0 or T=1, the reader
automatically uses that protocol type, regardless of the protocol type selected by the application.
4.4 Interface for Microcontroller-based Cards
For microcontroller-based smart cards only the contacts C1 (VCC), C2 (RST), C3 (CLK), C5 (GND) and C7
(I/O) are used. A frequency of 4 MHz is applied to the CLK signal (C3).
4.5 Card Tearing Protection
The AET63 provides a mechanism to protect the inserted card when it is suddenly withdrawn while it is
powered up. The power supply to the card and the signal lines between the AET63 and the card are
immediately deactivated when the card is being removed. As a general rule, however, to avoid any electrical
damage,
a card should only be removed from the reader while it is powered down.
NOTE
- The AET63 does never by itself switch on the power supply to the inserted card. This must explicitly be done by the
controlling computer through the proper command sent to the reader.
5. Power Supply
The AET63 requires a voltage of 5V DC, 100mA, regulated, power supply. The AET63 gets the power supply
from PC (through the cable supplied along with each type of reader).
