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DS28E02：1-Wire SHA-1 Authenticated 1Kb EEPROM with 1.8V Operation

Provides Low-Cost, Secure Bidirectional Authentication Over a Single Contact for Low-Power Applications

The DS28E02 combines 1024 bits of EEPROM with challenge-and-response authentication security implemented with the FIPS 180-3 Secure Hash Algorithm (SHA-1). The 1024-bit EEPROM array is configured as four pages of 256 bits with a 64-bit scratchpad to perform write operations. All memory pages can be write protected, and one page can be put in EPROM-emulation mode, where bits can only be changed from a 1 to a 0 state. Each DS28E02 has its own guaranteed unique 64-bit ROM registration number that is factory installed into the chip. The DS28E02 communicates over the single-contact 1-Wire® bus. The communication follows the standard 1-Wire protocol with the registration number acting as the node address in the case of a multidevice 1-Wire network.

Key Features 1024 Bits of EEPROM Memory Partitioned Into Four Pages of 256 Bits On-Chip 512-Bit SHA-1 Engine to Compute 160-Bit Message Authentication Codes (MACs) and to Generate Secrets Write Access Requires Knowledge of the Secret and the Capability of Computing and Transmitting a 160-Bit MAC as Authorization User-Programmable Page Write Protection for Page 0, Page 3, or All Four Pages Together User-Programmable OTP EPROM Emulation Mode for Page 1 ("Write to 0") Communicates to Host with a Single Digital Signal at 12.5kbps or 35.7kbps Using 1-Wire Protocol Switchpoint Hysteresis and Filtering to Optimize Communication Performance in the Presence of Noise Reads and Writes Over 1.75V to 3.65V Voltage Range from -20°C to +85°C 6-Lead TSOC and TDFN Packages

DS28E02: Typical Operating Circuit Applications/Uses Medical Consumable Authentication Printer Cartridge Configuration and Monitoring Reference Design License Management Sensor/Accessory Authentication and Calibration System Intellectual Property Protection

DataSheet

Parametrics

Design kits & evaluation modules

• DS9481R-3C7
• DS9120
• DS9120P
• DS9120Q

Quality and Environmental Data

• DS28E02.pdf

Related Products

• DS28E10：1-Wire SHA-1 Authenticator
• DS2460：SHA-1 Coprocessor with EEPROM
• DS2482-100：Single-Channel 1-Wire Master

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