ACS ACR100I User Manual download pdf (Page 7)

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ACR100I Reference Manual

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5.0. Smart Card Interface

The interface between the ACR100I and the inserted smart card follows the specifications of ISO

7816-3.

5.1. Smart Card Power Supply VCC (C1)

The current consumption of the inserted card must not be higher than 50 mA.

5.2. 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 ACR100I. The electrical specifications of this contact are identical to those

of the single RST (at contact C2).

5.3. Card Type Selection

The controlling PC has to select the card type always through the proper command sent to the

ACR100I prior to activating the inserted card. This includes both the memory cards and MCU-based

cards. 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.

5.4. 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).

5.5. Card Tearing Protection

The ACR100I provides a mechanism to protect the inserted card when it is suddenly withdrawn while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 ACR100I and are

immediately deactivated when the card is being removed. As a rule, however, to avoid any electrical

damage, a card should only be removed from the reader while it is powered down.

Note: The ACR100I never switches on the power supply to the inserted card by itself. This

must be explicitly be done by controlling the computer through the proper command sent to

the reader.

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ACS ACR100I User Manual Page 7