MAXIM DS28E02P+

The DS28E02 combines 1024 bits of EEPROM organized as four 256-bit pages, a 64-bit secret, a register page, a 512-bit SHA-1 engine, and a 64-bit ROM registration number in a single chip. Data is transferred serially through the 1-Wire protocol, which requires only a single data lead and a ground return. The DS28E02 has an additional memory area called the scratchpad that acts as a buffer when writing to the memory, the register page, or when installing a new secret.

• 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

• Reference Design
• License Management System
• Intellectual Property Protection
• Sensor/Accessory Authentication and Calibration
• Medical Consumable Authentication
• Printer Cartridge Configuration and Monitoring