DS28E22 View Datasheet(PDF) - Maxim Integrated

Part Name

Description

Manufacturer

DS28E22

DeepCover Secure Authenticator with 1-Wire SHA-256 and 2Kb User EEPROM

Maxim Integrated 

ABRIDGED DATA SHEET

EVALUATION KIT AVAILABLE

DS28E22

DeepCover Secure Authenticator with

1-Wire SHA-256 and 2Kb User EEPROM

General Description

DeepCoverM 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 (DS28E22) com-

bines crypto-strong, bidirectional, secure challenge-

and-response authentication functionality with an imple-

mentation based on the FIPS 180-3-specified Secure

Hash Algorithm (SHA-256). A 2Kb user-programmable

EEPROM array provides nonvolatile storage of applica-

tion data and additional protected memory holds a read-

protected secret for SHA-256 operations and settings

for user memory control. Each device has its own guar-

anteed unique 64-bit ROM identification number (ROM

ID) that is factory programmed into the chip. This unique

ROM ID is used as a fundamental input parameter for

cryptographic operations and also serves as an elec-

tronic serial number within the application. A bidirectional

security model enables two-way authentication between

a host system and slave-embedded DS28E22. Slave-to-

host authentication is used by a host system to securely

validate that an attached or embedded DS28E22 is

authentic. Host-to-slave authentication is used to protect

DS28E22 user memory from being modified by a non-

authentic host. The SHA-256 message authentication

code (MAC), which the DS28E22 generates, is computed

from data in the user memory, an on-chip secret, a host

random challenge, and the 64-bit ROM ID. The DS28E22

communicates over the single-contact 1-WireM bus at

overdrive speed. The communication follows the 1-Wire

protocol with the ROM ID acting as node address in the

case of a multiple-device 1-Wire network.

Applications

Authentication of Network-Attached Appliances

Printer Cartridge ID/Authentication

Reference Design License Management

System Intellectual Property Protection

Sensor/Accessory Authentication and Calibration

Secure Feature Setting for Configurable Systems

Key Generation and Exchange for Cryptographic

Systems

Features

S Symmetric Key-Based Bidirectional Secure

Authentication Model Based on SHA-256

S Dedicated Hardware-Accelerated SHA Engine for

Generating SHA-256 MACs

S Strong Authentication with a High Bit Count, User-

Programmable Secret, and Input Challenge

S 2048 Bits of User EEPROM Partitioned Into 8

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 Communicates

with Host at Up to 76.9kbps

S Operating Range: 3.3V ±10%, -40NC to +85NC

S Low-Power 5µA (typ) Standby

S ±8kV Human Body Model ESD Protection (typ)

S 6-Pin TDFN, 6-Lead TSOC Packages

Typical Application Circuit

3.3V

(I2C PORT)

µC

RP

VCC

SDA

SCL

DS2465

RP = 1.1kΩ

MAXIMUM I2C BUS CAPACITANCE 320pF

1-Wire LINE

SLPZ

IO

DS28E22

Ordering Information appears at end of data sheet.

DeepCover and 1-Wire are registered trademark of Maxim Integrated Products, Inc.

For related parts and recommended products to use with this part, refer to: www.maximintegrated.com/DS28E22.related

For pricing, delivery, and ordering information, please contact Maxim Direct at

1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.

219-0020; Rev 2; 12/12

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