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SHA-1 Battery Pack Authentication IC

SHA-1 Battery-Pack Authentication IC Provides a Robust Cryptographic Solution to Ensure the Authenticity of Li+ Battery Packs for Portable Devices

Product Details

Key Features

Parametric specs for Battery ID and Authentication
Functions Battery ID
SHA-1 Authentication
Interface 1-Wire
VSUPPLY (V) 2.7 to 5.5
Package/Pins UMAX/8
Oper. Temp. (°C) -40 to +85
Budgetary
Price (See Notes)
1.38
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Simplified Block Diagram

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Parameters

Parametric specs for Battery ID and Authentication
Functions Battery ID
SHA-1 Authentication
Interface 1-Wire
VSUPPLY (V) 2.7 to 5.5
Package/Pins UMAX/8
Oper. Temp. (°C) -40 to +85
Budgetary
Price (See Notes)
1.38

Key Features

  • 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 VPULLUP as Low as 2.7V
  • Pb-Free 8-Pin µMAX® or 2mm x 3mm TDFN Package

Applications/Uses

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

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—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.

Simplified Block Diagram

DS2703: Typical Operating Circuit DS2703: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .