DS28E15 Datasheet, PDF (1/6 Pages) Maxim Integrated Products – 1-Wire SHA-256 Secure Authenticator with 512-Bit User EEPROM

ABRIDGED DATA SHEET
219-0018; Rev 0; 6/12
DS28E15
1-Wire SHA-256 Secure Authenticator
with 512-Bit User EEPROM
General Description
The DS28E15 combines crypto-strong bidirectional
secure challenge-and-response authentication func-
tionality with an implementation based on the FIPS
180-3-specified Secure Hash Algorithm (SHA-256). A
512-bit user-programmable EEPROM array provides
nonvolatile storage of application data. Additional pro-
tected memory holds a read-protected secret for SHA-
256 operations and settings for memory protection
control. Each device has its own guaranteed unique
64-bit ROM identification number (ROM ID) that is fac-
tory programmed into the chip. This unique ROM ID is
used as a fundamental input parameter for cryptographic
operations and also serves as an electronic serial num-
ber within the application. A bidirectional security model
enables two-way authentication between a host system
and slave-embedded DS28E15. Slave-to-host authenti-
cation is used by a host system to securely validate that
an attached or embedded DS28E15 is authentic. Host-
to-slave authentication is used to protect DS28E15 user
memory from being modified by a nonauthentic host. The
DS28E15 communicates over the single-contact 1-Wire^M
bus at overdrive speed. The communication follows the
1-Wire protocol with the ROM ID acting as node address
in the case of a multidevice 1-Wire network.
Features
S Symmetric-Key-Based Bidirectional Secure
Authentication Model Based on SHA-256
S Strong Authentication with a High-Bit-Count User-
Programmable Secret and Input Challenge
S 512 Bits of User EEPROM Partitioned Into Two
Pages of 256 Bits
S User-Programmable and Irreversible EEPROM
Protection Modes Including Authentication, Write
and Read Protect, and OTP/EPROM Emulation
S Unique Factory-Programmed, 64-Bit Identification
Number
S Single-Contact 1-Wire Interface
S Operating Range: 3.3V ±10%, -40°C to +85°C
S ±8kV HBM ESD Protection (typ)
S 2-Pin SFN, 6-Pin TDFN-EP, and 6-Pin TSOC
Packages
Applications
Authentication of Consumables
Secure Feature Control
Ordering Information appears at end of data sheet.
Typical Application Circuit
3.3V
(I²C PORT)
µC
RP = 1.1kΩ
MAXIMUM I²C BUS CAPACITANCE 320pF
RP
VCC
SDA
SCL
DS2465
1-Wire LINE
SLPZ
IO
DS28E15
#1
DS28E15
#2
DS28E15
#n
1-Wire is a registered trademark of Maxim Integrated Products, Inc.
For related parts and recommended products to use with this part, refer to: www.maxim-ic.com/DS28E15.related
For pricing, delivery, and ordering information, please contact Maxim Direct
  1
at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.