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. Applications * Cell Phones/Smartphones * Cradle and Accessory Chargers * Digital Cameras * Portable DVD and Media Players * 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)