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DS2703U+ Datasheet(PDF) 1 Page - Dallas Semiconductor |
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DS2703U+ Datasheet(HTML) 1 Page - Dallas Semiconductor |
1 / 20 page 1 of 20 REV: 071805 Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata. GENERAL DESCRIPTION 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 ¾just 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. TYPICAL OPERATING CIRCUIT DS2703 VSS DQ DATA PACK + PACK - VB 150 W Li-Ion Protection THM BATTERY PACK 0.22 mF 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 Communication Modes § Unique 64-Bit Serial Number § Thermistor Multiplexer § Operates with VPULLUP as Low as 2.7V § mMax-8 Package (Lead-Free) ORDERING INFORMATION PART TEMP RANGE PIN-PACKAGE DS2703U -20 °C to +70°C mMax-8 DS2703U/T&R -20 °C to +70°C DS2703U on Tape-and-Reel DS2703U+ -20 °C to +70°C mMax-8 DS2703U+T&R -20 °C to +70°C DS2703U+ on Tape-and-Reel + Denotes lead-free package. APPLICATIONS 2.5G/3G Wireless Handsets PDAs Handheld or Notebook Computers and Terminals Digital Still and Video Cameras PIN CONFIGURATION DS2703 SHA-1 Battery Pack Authentication IC www.maxim-ic.com TOP VIEW mMAX DS2703U+ VSS NC NC NC NC VB DQ THM 6 8 7 5 3 1 2 4 1-Wire is a registered trademark of Dallas Semiconductor. |
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