1Kb Protected 1-Wire EEPROM with SHA-1 Engine

The DDS28E01-100/DS28E01A-100 combines 1024 bits of EEPROM with challenge-and-response authentication security implemented with the ISO/IEC 10118-3 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 DS28E01-100/DS28E01A-100 has its own guaranteed unique 64-bit ROM registration number that is factory lasered into the chip. The DS28E01-100/DS28E01A-100 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.

Applications

* Printer Cartridge Configuration and Monitoring

* Medical Sensor Authentication and Calibration

* System Intellectual Property Protection

* 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 (MAC) and to Generate Secrets

* Dedicated 64-Bit Write-Only Secret with a Feature to Extend the Secret Size to 320 Bits by Setting a 256-Bit Page as Both Read and Write Protected

* 5-Byte Challenge Size for Read Authenticated Page with Optional “Anonymous” Mode

* 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 15.3kbps or 90.9kbps Using 1-Wire Protocol

* Switchpoint Hysteresis and Filtering to Optimize Performance in the Presence of Noise

* Reads and Writes Over a Wide Voltage Range of 2.8V to 5.25V from -40°C to +85°C

* 6-Lead TSOC and TDFN or 2-Lead TO-92 and SFN Packages