DS2705:SHA-1 Authentication Master

Dedicated IC Simplifies Implementation of a SHA-1 Based Token Authentication System

The DS2705 provides the master side of a Secure Hash Algorithm (SHA) based token authentication scheme. Hardware-based SHA authentication allows for security without the added cost and complexity of a microprocessor-based system. Batteries and other accessories are authenticated using a single contact through the Dallas 1-Wire® interface. Authentication is performed on demand or automatically, with the pass/fail status reported on open-drain output pins to signal the charge system and/or drive LEDs. The DS2705 stores a predetermined challenge-and-response pair in nonvolatile (NV) EEPROM. The DS2705 works in conjunction with Dallas Battery Management SHA-1 token products, including the DS2703 and DS2704.

Key Features
  • Initiates Challenge-and-Response Authentication based on the SHA-1 Algorithm
  • Dallas 1-Wire Master/Slave Interface Operates at Standard and Overdrive Speeds
  • Input and Output pins for Initiating Challenge and Reporting Authentication Pass/Fail
  • Programmable Configuration
  • Operates from 2.5V to 5.5V Supply
  • Tiny µMAX® Package (Pb-Free)
DS2705: Block Diagram
DS2705: Block Diagram
Applications/Uses
  • Cell Phones/Smartphones
  • Cradle and Accessory Chargers
  • Digital Cameras
  • Portable DVD and Media Players
DataSheet
titleDownload file
DS2705 Data SheetDS2705.pdf
Parametrics
Part NumberFunctionsInterfaceVSUPPLY
(V)
Package/PinsOper. Temp.
(°C)
Budgetary
Price
See Notes
DS2705SHA-1 Authentication
SHA-1 Master
1-Wire2.7 to 5.5µMAX/8-40 to +85$2.65 @1k
Design kits & evaluation modules
Quality and Environmental Data
Related Products
  • DS2704:1280-Bit EEPROM with SHA-1 Authentication
  • DS2703:SHA-1 Battery Pack Authentication IC
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
DS2705U+ActiveµMAX,;8 pin;15.6 mm²-40°C to +85°CLead Free
DS2705.pdf DS2705
DS2705.pdf DS2705
DS2705.pdf DS2705
DS2705.pdf DS2705
DS2705.pdf DS2705