Rainbow Electronics MAX66120 - Manual (Page 2)

MAX66120
ISO 15693-Compliant 1Kb Memory Fob
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ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(T A = -25°C to +50°C.) (Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Note 1: System requirement.
Note 2: Guaranteed by simulation; not production tested.
Note 3: Write-cycle endurance is degraded as T
A increases. Not 100% production tested; guaranteed by reliability monitor sampling.
Note 4: Guaranteed by 100% production test at elevated temperature for a shorter time; equivalence of this production test to data
sheet limit at operating temperature range is established by reliabiliity testing.
Note 5: Production tested at 13.56MHz only.
Note 6: Measured from the time at which the incident field is present with strength greater than or equal to H
(MIN) to the time at
which the MAX66120’s internal power-on reset signal is deasserted and the device is ready to receive a command frame.
Not characterized or production tested; guaranteed by simulation only.
Maximum Incident Magnetic Field Strength ..........141.5dBµA/m
Operating Temperature Range ...........................-25°C to +50°C Relative Humidity ..............................................(Water Resistant)
Storage Temperature Range ...............................-25°C to +50°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
EEPROM
Programming Time t PROG (Note 2) 9 10 ms
Endurance N CYCLE At +25°C (Note 3) 200,000 Cycles
Data Retention t RET (Note 4) 40 Years
RF INTERFACE
Carrier Frequency f
C
(Notes 1, 5) 13.553 13.560 13.567 MHz
Activation Field Strength H MIN At 25°C (Note 2) 122.0 dBμA/m
Write Field Strength H WR At 25°C (Note 2) 122.4 dBμA/m
Maximum Field Strength H MAX At 25°C (Note 2) 137.5 dBμA/m
Power-Up Time t POR (Notes 2, 6) 1.0 ms
Detailed Description
The MAX66120 combines 1024 bits of user EEPROM,
128 bits of user and control registers, a 64-bit unique
identifier (UID), and a 13.56MHz ISO 15693 RF inter-
face in a single key fob. The memory is organized as 18
blocks of 8 bytes each. Each block has a user-readable
write-cycle counter. Four adjacent user EEPROM
blocks form a memory page (pages 0 to 3). Memory
protection features include write protection and EPROM
emulation, which the user can set for each individual
memory page. The memory of the MAX66120 is
accessed through the standard ISO 15693 memory and
control function commands. The data rate can be as
high as 26.69kbps. The MAX66120 supports AFI and
DSFID. Applications of the MAX66120 include driver
identification (fleet application), access control, and
asset tracking.
Overview
Figure 1 shows the relationships between the major
control and memory sections of the MAX66120. The
device has three main data components: 1) 64-bit UID,
2) four 256-bit pages of user EEPROM, and 3) two 8-
byte blocks of user and control registers. Figure 2
shows the applicable ISO 15693 commands and their
purpose. The network function commands allow the
master to identify all slaves in its range and to change
their state, e.g., to select one for further communication.
The protocol required for these network function com-
mands is described in the
Network Function
Commands section. The memory and control functions
access the memory of the MAX66120 for reading and
writing. The protocol for these memory and control
function commands is described in the
Memory and
Control Function Commands section. All data is read
and written least significant bit (LSb) first, starting with
the least significant byte (LSB).