#Contact smart cards (ISO7816) interface(s)

SpringCore devices that features one or more contact smart card interfaces supports ISO/IEC 7816-3 classes A, B and C (5V, 3V and 1.8V) and both T=0 and T=1 protocols.

The card’s ATR gives two important informations to the reader:

• The max. frequency and bitrate supported by the card (ATR byte TA1). The reader will not switch frequency: SpringCore devices operate contact cards at 4.0MHz only, but it will try to use the highest bitrate supported by the card,
• Whether the card supports only the T=0 protocol, or only the T=1 protocol, or both, and whether the card is in negociable mode or a particular mode is implicitely selected.

The SpringCore device automatically activates the card with the “best” bitrate and protocol through a PPS procedure.