ISO 15693-Compliant 1Kb Memory Fob

2

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ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

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 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.

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

(Note 2)

9

10

ms

Endurance

At +25°C (Note 3)

200,000

Cycles

Data Retention

(Note 4)

40

Years

RF INTERFACE

Carrier Frequency

(Notes 1, 5)

13.553

13.560

13.567

MHz

Activation Field Strength

At 25°C (Note 2)

122.0

dBμA/m

Write Field Strength

At 25°C (Note 2)

122.4

dBμA/m

Maximum Field Strength

At 25°C (Note 2)

137.5

dBμA/m

Power-Up Time

(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).