AT88SC3216CRF-MVB1G Atmel, AT88SC3216CRF-MVB1G Datasheet - Page 136

• 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

Appendix O. The ISO/IEC 14443 Type B RF Signal Interface
O.1.
O.2.
136
RF Signal Interface
The CryptoRF communications interface is compliant with the ISO/IEC 14443 part 2 and part 3 requirements for Type
B. Type B signaling utilizes 10 % amplitude modulation of the RF field for communication from the reader to the card
with NRZ encoded data. Communication from card to reader utilizes BPSK load modulation of an 847.5 khz subcarrier
with NRZ-L encoded data. The RF field is continuously on for Type B communications.
Data Format
Data communication between the card and reader is performed using an LSB first data format. Each byte of data is
transmitted with a 0b start bit and a 1b stop bit as shown in Figure 46. The stop bit, start bit, and each data bit are each
one elementary time unit (ETU) in length (9.4395 microseconds).
Each byte transmission consists of a start bit, 8 data bits (LSB first), and a stop bit. Each byte may be separated from
the next byte by extra guard time (EGT). The EGT may be zero or a fraction of an ETU. EGT cannot exceed 57
microseconds for data transmitted by the PCD. EGT for data transmitted by the CryptoRF PICC is programmed to
either zero or 2 ETUs using the EGTL bit of the Device Configuration Register (DCR). The position of each bit is
measured relative to the falling edge of the start bit.
Figure 46.
Despite the fact that data transmissions occur LSB first, all of the commands, data, and CRC bytes in ISO/IEC 14443
and in this specification are listed in the conventional manner, with MSB on the left and LSB on the right.
AT88SC0808/1616/3216/6416CRF, AT88RF04C
<-- All bit timing is measured from the falling edge of the Start bit
Start
Bit transitions shall occur within (n - 0.125) ETU and (n + 0.125) ETU of the falling edge of start bit
Byte transmission format requirements for type B communications.
LS
b0
B
b1
One Byte Transmission is 10 ETUs long plus EGT
b2
b3
b4
EGT is 0 to 57 uS for PCD transmissions
b5
b6
M
b7
SB
Stop
EGT
5276C–RFID–3/09