DS2703 Datasheet | Dallas Semiconductor

DESCRIPTION The DS2703 provides a robust cryptographic solution to ensure the authenticity of Li-Ion battery packs for cell phone, PDA, and portable puting 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 authentication¾just 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 mand, the THM pin presents the thermistor impedance on the data contact and disconnects internal loading from the node. - - - - - - FEATURES Secure Challenge and Response Authentication Using the SHA-1 Algorithm ® Directly Powered by the Dallas 1-Wire Interface with 16kpbs Standard and 143kpbs Overdrive munication Modes Unique 64-Bit Serial Number Thermistor Multiplexer Operates with VPULLUP as Low as 2.7V m Max-8 Package (Lead-Free) ORDERING INFORMATION PART DS2703U DS2703U/T&R DS2703U+ DS2703U+T&R TEMP RANGE -20°C to +70°C -20°C to +70°C -20°C to +70°C -20°C to +70°C PIN-PACKAGE m Max-8 DS2703U on Tape-and-Reel m Max-8 DS2703U+ on Tape-and-Reel + Denotes lead-free package. APPLICATIONS 2.5G/3G Wireless Handsets PDAs Handheld or Notebook puters and Terminals Digital Still and Video Cameras TYPICAL OPERATING CIRCUIT PACK + BATTERY PACK PIN CONFIGURATION TOP VIEW THM VSS DQ VB 1 2 3 4 8 7 6 5 NC NC NC NC DATA 150 W DQ VB 0.22 m F THM VSS m...