Analog Devices DS2703 Product Info

• Secure Challenge and Response Authentication Using the SHA-1 Algorithm
• Directly Powered by the Dallas 1-Wire Interface with 16kbps Standard and 143kbps Overdrive Communication Modes
• Unique 64-Bit Serial Number
• Thermistor Multiplexer
• Operates with V_PULLUP as Low as 2.7V
• Pb-Free 8-Pin µMAX® or 2mm x 3mm TDFN Package

The DS2703 provides a robust cryptographic solution to ensure the authenticity of Li-Ion battery packs for cell phone, PDA, and portable computing devices. The DS2703 employs the Secure Hash Algorithm (SHA-1) specified in the Federal Information publication 180-1 and 180-2, and ISO/IEC 10118-3. SHA-1 is designed for authentication—just what is required for identifying battery packs manufactured by authorized sources.

The device's SHA-1 engine processes a host transmitted challenge using its stored 64-bit secret key and unique 64-bit ROM ID to produce a 160-bit response word for transmission back to the host. The secret key is securely stored on-chip and never transmitted between the battery and the host. A DS2703-based system produces a high degree of authentication security between a host system and its removable battery or other peripheral devices.

The Thermistor Multiplexer feature allows a three contact battery pack configuration to support data and thermistor functions. When activated through 1-Wire® command, the THM pin presents the thermistor impedance on the data contact and disconnects internal loading from the node.

Applications

• 2.5G/3G Wireless Handsets
• Digital Still and Video Cameras
• Handheld or Notebook Computers and Terminals
• PDAs