AT88SC3216CRF-MVB1G Atmel, AT88SC3216CRF-MVB1G Datasheet - Page 138

• Manufacturer Part Number: AT88SC3216CRF-MVB1G
• Description: CRYPTOMEMORY 32KBIT 16ZONE MVB
• Manufacturer: Atmel
• Series: CryptoMemory®, CryptoRF®r

Specifications of AT88SC3216CRF-MVB1G

• Rf Type: Read / Write
• Frequency: 13.56MHz
• Features: ISO1444-2, 1444-3, 32-kbits
• Package / Case: MVB Module
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

O.5.
O.6.
138
Card Data Transmission
The CryptoRF PICC waits silently for a command from the PCD after being activated by the RF field. After receiving a
valid command from the PCD, the PICC is allowed to turn on the subcarrier only if it intends to transmit a complete
response frame. The PICC response consists of TR1, SOF, several bytes of data followed by a 2 byte CRC_B, and the
EOF. The subcarrier is turned off no later than 2 ETUs after the EOF. Figure 49 shows the PICC frame format.
When the subcarrier is turned on it remains unmodulated for a time period known as the synchronization time (TR1).
The phase of the subcarrier during TR1 defines a logical one and permits the reader demodulator to lock on to the
subcarrier signal. The subcarrier remains on until after the EOF transmission is complete. The TR1 transmitted by
CryptoRF is 10 to 11 ETUs in duration for all responses.
Figure 49.
After the PICC receives a command from the PCD, it is not permitted to transmit a subcarrier during the guard time
(TR0). The minimum guard time is 8 ETUs for all command responses. The maximum guard time is defined by the
frame waiting time (FWT), except for the ATQB response (response to REQB or Slot MARKER polling commands)
which has a maximum TR0 of 32 ETUs.
Figure 50.
PCD (Reader)
The FWT is the maximum time that a PICC requires to begin a response. The PICC transmits a parameter in the ATQB
response to the polling command that tells the reader the worst case FWT. Typical response times for the CryptoRF
are listed in Appendix Q of this specification. See Appendix P for signal timing specifications.
The PCD is not permitted to modulate the RF field while waiting for a PICC to respond to a command. Modulation of
the RF field during a memory read or write operation may corrupt the operation or cause reset of the PICC.
AT88SC0808/1616/3216/6416CRF, AT88RF04C
Response Timing
PICC (Chip)
Subcarrier Off
Format of a frame transmitted by the PICC to the reader.
ISO/IEC 14443 Response timing requirements for the card.
Subcarrier On
CRC
TR1
Start of Frame
Subcarrier OFF
EOF
Transmit Data and CRC_B
TR0
Data Transmission
No modulation
Subcarrier ON
TR1
Unmodulated Carrier
End of Frame
SOF
Subcarrier Off
5276C–RFID–3/09
Response
Data