MAX66120 MAXIM [Maxim Integrated Products], MAX66120 Datasheet - Page 6

• Manufacturer Part Number: MAX66120
• Description: ISO 15693-Compliant 1Kb Memory Fob Powered Entirely Through the RF Field
• Manufacturer: MAXIM [Maxim Integrated Products]

ISO 15693-Compliant 1Kb Memory Fob
Table 3. Protection Code Assignments for U-Lock, AFI-Lock, DSFID-Lock, S-Lock
Figure 5. ISO 15693 Frame Format
Figure 6. Downlink Modulation (e.g., Approximately 100% Amplitude Modulation)
The communication between the master and the
MAX66120 (slave) is based on the exchange of data
packets. The master initiates every transaction; only
one side (master or slaves) transmits information at any
time. Each data packet begins with a start-of-frame
(SOF) pattern and ends with an end-of-frame (EOF)
pattern. A data packet with at least 3 bytes between
SOF and EOF is called a frame (Figure 5). The last 2
bytes of an ISO 15693 frame are an inverted 16-bit
6
00000000b
(00h)
10101010b
(AAh)
All other codes
_______________________________________________________________________________________
SOF
CODE
ISO 15693 Communication
1 OR MORE DATA BYTES
Unlocked (factory default)
Locked (irreversible)
Unlocked
100%
AMPLITUDE
CARRIER
Concept
CRC (LSB)
CRC of the preceding data generated according to the
CRC-16-CCITT polynomial. This CRC is transmitted with
the LSB first. For more details on the CRC-16-CCITT,
refer to ISO 15693 Part 3, Annex C.
For transmission, the frame information is modulated on
a carrier frequency, which is 13.56MHz for ISO 15693.
The subsequent paragraphs are a concise description
of the required modulation and coding. For full details
including graphics of the data coding schemes and
SOF/EOF timing, refer to ISO 15693-2, Sections 7.2,
7.3, and 8.
DESCRIPTION
CRC (MSB)
t
EOF
TIME