at88sc6416crf ATMEL Corporation, at88sc6416crf Datasheet - Page 3

• Manufacturer Part Number: at88sc6416crf
• Description: 13.56 Mhz Cryptorf Eeprom Memory 64 Kbits
• Manufacturer: ATMEL Corporation

Communications
Anticollision Protocol
CRC Error Detection
Type A Tolerance
5006CS–CRRF–12/06
All personalization and communication with this device is performed through the RF
interface. The IC includes an integrated tuning capacitor, enabling it to operate with only
the addition of a single external coil antenna.
The RF communications interface is fully compliant with the electrical signaling and RF
power specifications in ISO/IEC 14443-2:2001 for Type B only. Anticollision operation and
frame formatting are compliant with ISO/IEC 14443-3:2001 for Type B only.
ISO/IEC 14443 nomenclature is used in this specification where applicable. The
following abbreviations are utilized throughout this document. Additional terms are
defined in the section in which they are used.
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When the PICC enters the 13.56 MHz RF field of the host reader (PCD), it performs a
power on reset (POR) function and waits silently for a valid Type B polling command.
The CryptoRF PICC processes the antitearing registers as part of the POR process.
The PCD initiates the anticollision process by issuing an REQB or WUPB command.
The WUPB command activates any card (PICC) in the field with a matching AFI code.
The REQB command performs the same function but does not affect a PICC in the Halt
state. The CryptoRF command set is available only after the anticollision process has
been completed.
A two-byte CRC_B is required in each frame transmitted by the PICC or PCD to permit
transmission error detection. The CRC_B is calculated on all of the command and data
bytes in the frame. The SOF, EOF, start bits, stop bits, and EGT are not included in the
CRC_B calculation. The two-byte CRC_B follows the data bytes in the frame.
Figure 2. Location of the Two CRC_B Bytes within a Frame
The RF Interface is designed for use in multiprotocol applications. It will not latch or lock
up if exposed to Type A signals and will not respond to them. The PICC may reset in the
presence of Type A field modulation but is not damaged by exposure to Type A signals.
PCD – Proximity Coupling Device: the reader/writer and antenna
PICC – Proximity Integrated Circuit Card: the tag/card containing the IC and
antenna
RFU – Reserved for Future Use: any feature, memory location, or bit that is held as
reserved for future use
$ xx – Hexadecimal Number: denotes a hex number “xx” (Most Significant Bit on
left)
SOF
K data bytes
CRC1
CRC2
EOF
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