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ISO/IEC 14443 Type B-Compliant
Secure Memory
Detailed Description
The MAX66040 combines 1024 bits of user EEPROM,
128 bits of user and control registers, a 64-bit UID, one
64-bit secret, a 512-bit SHA-1 engine, and a 13.56MHz
RF interface (ISO/IEC 14443 Type B, Parts 2-4) in a sin-
gle chip. The memory is organized as 19 blocks of 8
bytes each. Except for the secret, 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. Page 3 can also be read pro-
tected for enhanced authentication strength. The
MAX66040 is accessed through the ISO/IEC 14443-4
block transmission protocol, where requests and
responses are exchanged through I-blocks once a
device is in the ACTIVE state. The reader must support
a frame size of at least 26 bytes. The data rate can be
as high as 847.5kbps. The MAX66040 supports AFI
and CID. Functions not supported are chaining, frame-
waiting time extension, and power indication.
Applications of the MAX66040 include driver identifica-
tion (fleet application), access control, electronic cash
(e-cash), and asset tracking.
Overview
Figure 1 shows the relationships between the major
control and memory sections of the MAX66040. The
INTERNALSUPPLY
VOLTAGE
REGULATOR
device has six main data components: 64-bit UID,
64-bit read/write buffer, four 256-bit pages of user
EEPROM, two 8-byte blocks of user and control regis-
ters, 64-bit secret ’s memory, and a 512-bit SHA-1
engine. Figure 2 shows the hierarchical structure of the
ISO/IEC 14443 Type B-compliant access protocol. The
master must first apply network function commands to
put the MAX66040 into the ACTIVE state before the
memory and control functions become accessible. The
protocol required for these network function commands
is described in the Network Function Commands sec-
tion. Once the MAX66040 is in the ACTIVE state, the
master can issue any one of the available memory and
control function commands. Upon completion of such a
command, the MAX66040 returns to the ACTIVE state
and the master can issue another memory and control
function command or deselect the device, which
returns it to the HALT state. 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).
Parasite Power
As a wireless device, the MAX66040 is not connected
to any power source. It gets the energy for operation
from the surrounding RF field, which needs to have a
minimum strength as specified in the Electrical
Characteristics table.
UID
RF
FRONT-
END
DATA
f c
ISO 14443
FRAME
FORMATTING
AND
ERROR
MEMORY AND
FUNCTION
CONTROL
READ/WRITE BUFFER
SHA-1
ENGINE
SECRET
DETECTION
Figure 1. Block Diagram
MODULATION
REGISTER
BLOCK
USER
EEPROM
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3
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