
ISO 15693-Compliant 1Kb Memory Fob
INTERNAL SUPPLY
VOLTAGE
REGULATOR
RF
FRONT-
END
ISO 15693
MEMORY AND
FUNCTION
CONTROL
UID
FRAME
DATA
f c
FORMATTING
AND
ERROR
DETECTION
Figure 1. Block Diagram
MODULATION
MAX66120
REGISTER
BLOCK
USER
EEPROM
COMMAND TYPE:
NETWORK
FUNCTION COMMANDS
MEMORY AND CONTROL
FUNCTION COMMANDS
AVAILABLE COMMANDS:
INVENTORY
STAY QUIET
SELECT
RESET TO READY
GET SYSTEM INFORMATION
WRITE SINGLE BLOCK
LOCK BLOCK
READ SINGLE BLOCK
READ MULTIPLE BLOCKS
CUSTOM READ BLOCK
WRITE AFI
LOCK AFI
WRITE DSFID
LOCK DSFID
DATA FIELD AFFECTED:
UID, AFI, DSFID, ADMINISTRATIVE DATA
UID
UID
UID
UID, AFI, DSFID, CONSTANTS
UID, DATA OF SELECTED MEMORY BLOCK, APPLICABLE PROTECTION CONTROL REGISTER
UID, APPLICABLE PROTECTION CONTROL REGISTER
UID, SELECTED MEMORY BLOCK, APPLICABLE PROTECTION CONTROL REGISTER
UID, SELECTED MEMORY BLOCK, APPLICABLE PROTECTION CONTROL REGISTER
MFGCODE, UID, SELECTED MEMORY BLOCK, APPLICABLE PROTECTION CONTROL REGISTER,
INTEGRITY BYTES
UID, AFI BYTE
UID, AFI LOCK BYTE
UID, DSFID BYTE
UID, DSFID LOCK BYTE
Figure 2. ISO 15693 Commands Overview
MSb
LSb
64
E0h
57 56
2Bh
49 48
0h
45 44
FEATURE CODE (02h)
37 36
36-BIT IC SERIAL NUMBER
1
Figure 3. 64-Bit UID
Parasite Power
As a wireless device, the MAX66120 is not connected
to any power source. It gets the energy for operation
from the surrounding RF field, which must have a mini-
mum strength as specified in the Electrical
Characteristics table.
Unique Identification Number (UID)
Each MAX66120 contains a factory-programmed and
locked identification number that is 64 bits long
(Figure 3). The lower 36 bits are the serial number of
the chip. The next 8 bits store the device feature
code, which is 02h. Bits 45 to 48 are 0h. The code in
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3