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PDF MAX66240 Data sheet ( Hoja de datos )
| Número de pieza | MAX66240 | |
| Descripción | DeepCover Secure Authenticator | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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MAX66240
ABRIDGED DATA SHEET
DeepCover Secure Authenticator with
ISO 15693, SHA-256, and 4Kb User EEPROM
General Description
DeepCover® embedded security solutions cloak sensitive
data under multiple layers of advanced physical security
to provide the most secure key storage possible.
The DeepCover Secure Authenticator (MAX66240) is a
transponder IC that combines an ISO/IEC 15693 and ISO
18000-3 Mode 1-compatible RF front-end, a FIPS 180-
based SHA-256 engine, and 4096 bits of user EEPROM
in a single chip. A bidirectional security model enforces
two-way authentication between a host system and the
MAX66240. Each device has its own guaranteed unique
64-bit ROM ID that is factory programmed into the chip.
This ROM ID is used as a fundamental input parameter
for cryptographic operations and serves as an electronic
serial number within the application.
Features and Benefits
●● Dedicated Hardware-Accelerated SHA Engine
●● Strong Authentication with a High Bit Count User-
Programmable Secret and Input Challenge
●● 4096 Bits of User EEPROM with User-Programmable
R/W Protection Options Including OTP/EPROM
Emulation Mode
●● Unique Factory-Programmed 64-Bit Identification
Number
●● ISO/IEC 15693: Up to 26kbps
●● ±2kV HBM ESD Protection for All Pins
Applications
●● Access Control
●● Asset Tracking
●● Printer Cartridge Configuration and Monitoring
●● Medical Sensor Authentication and Calibration
●● System Intellectual Property Protection
Typical Application Circuit
Ordering Information appears at end of data sheet.
13.56MHz READER
TRANSMITTER
RECEIVER
TX_OUT
RX_IN
DeepCover is a registered trademark of Maxim Integrated
Products, Inc.
MAGNETIC
COUPLING
ANTENNA
MAX66240
IC LOAD
SWITCHED
LOAD
For related parts and recommended products to use with this part, refer
to www.maximintegrated.com/MAX66240.related.
219-0042; Rev 0; 3/14
1 page  
MAX66240
ABRIDGED DATA SHEET
DeepCover Secure Authenticator with
ISO 15693, SHA-256, and 4Kb User EEPROM
Detailed Description
The MAX66240 transponder combines an ISO 15693 RF
front-end, a SHA-256 engine, 4096 bits of user EEPROM
organized as 16 256-bit pages, protection control, status
memory, and a 64-bit ROM ID in a single chip. A 256-bit
scratchpad assists when installing a new secret or stores
the challenge when computing a page MAC.
It is common for a secure authentication IC to be attacked
using a variety of sophisticated die-level methods to
extract secure data, reverse device settings, etc., in an
effort to compromise a system security implementation.
To provide the highest affordable protection against this
inevitable malicious attack, the MAX66240 employs pro-
prietary die-level physical techniques, circuits, and crypto
methods to protect sensitive data, control signals, and
control settings.
There are multiple programmable options for the 4Kb user
array including unrestricted read/write and four protection
modes: read protection, write protection, EPROM emula-
tion mode, and authentication protection. Read protection
prevents user read-access to the memory, which effec-
tively extends the secret into the protected memory. The
data remains accessible only for the SHA-256 engine.
Write protection prevents changes to the memory data.
EPROM emulation mode logically ANDs memory data
with incoming new data, which allows changing bits from
1 to 0, but not vice versa. By changing one bit at a time,
this mode could be used to create a nonvolatile, nonreset-
table counter. EPROM emulation mode requires that the
memory is not write protected. Authentication protection,
if activated, requires that the host prove itself as authentic
(i.e., knows the MAX66240 secret) to modify the memory
by supplying a correct MAC that is based on the device
secret, its ROM ID, memory data, and the new data to
be copied to EEPROM. If the authentication hurdle is
passed, the write protection and EPROM emulation mode
protections still determine the effect of the write access.
Any protection, if activated, applies to individual memory
pages. As a factory default, none of the protections is
activated. Once authentication protection is activated, the
reader must authenticate itself for memory writes as well
as for additional changes to the memory protection.
In addition to its important use as a unique data value in
cryptographic SHA-256 computations, the device’s 64-bit
ROM ID can be used to electronically identify the object
to which the MAX66240 is associated. Applications of the
MAX66240 include, access control, asset tracking, printer
cartridge configuration and monitoring, medical sensor
authentication and calibration, and system intellectual
property protection.
Overview
The block diagram in Figure 1 shows the relationships
between the major control and memory sections of the
MAX66240.
Figure 2 shows the applicable commands and the
affected data fields. The network function commands
allow the reader to identify all transponders in its range
and to change their state, e.g., to select one for further
communication. The protocol required for these network
function commands is described in the Network Function
Commands section. The memory and control functions
fall into five categories: ISO 15693 generic commands,
secret installation, memory access, protection setting,
and MAC computation. The protocol for these com-
mands 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).
www.maximintegrated.com
Maxim Integrated │ 5
5 Page 
MAX66240
ABRIDGED DATA SHEET
DeepCover Secure Authenticator with
ISO 15693, SHA-256, and 4Kb User EEPROM
ISO/IEC 15693 Interface
The communication between an HF reader and MAX66240
(transponder) is a master-transponder type transaction,
and is based on the exchange of data packets. The
reader initiates every transaction; only one side (reader
or transponder) 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 delimited by an SOF and an EOF is called a frame
(Figure 8). The last 2 bytes of an ISO 15693 frame are
an inverted 16-bit CRC of the preceding data generated
according to the CRC-16-CCITT polynomial X16 + X12 +
X5 + 1 (Figure 9). This CRC is transmitted with the LSB
first. For more details on the CRC-16-CCITT, refer to ISO
15693-3, Annex C. Frame information is modulated on
a 13.56MHz carrier. The subsequent paragraphs are a
concise description of the required modulation, coding,
and basic timing.
SOF 1 OR MORE DATA BYTES
Figure 8. ISO/IEC 15693 Frame Format
CRC (LSB)
CRC (MSB)
EOF
TIME
MSb
1ST
STAGE
X0
2ND
STAGE
X1
3RD
STAGE
X2
4TH
STAGE
X3
POLYNOMIAL = X16 + X12 + X5 + 1
5TH
STAGE
X4
6TH
STAGE
X5
7TH
STAGE
X6
8TH
STAGE
X7
9TH
STAGE
X8
10TH
STAGE
X9
11TH
STAGE
X10
12TH
STAGE
X11
Figure 9. CRC-16-CCITT Generator
13TH
STAGE
X12
14TH
STAGE
X13
15TH
STAGE
X14
LSb
16TH
STAGE
X15 X16
INPUT DATA
www.maximintegrated.com
Maxim Integrated │ 11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet MAX66240.PDF ] | |
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