Description

The DS2704 provides 1280 bits of EEPROM datastorage and a Secure Hash Algorithm (SHA) engine.The Dallas 1-Wire® interface enables serialcommunication on a single battery contact and the64-bit unique serial number allows multidropnetworking and identification of individual devices.The 1280-bit memory is organized as 5 pages of 32bytes each and supports storage of battery cellcharacteristics, charging voltage, current, andtemperature parameters, as well as battery packmanufacturing data. The EEPROM pages are incircuit rewritable and can be individually locked towrite protect data.The DS2704 employs the Secure Hash Algorithm(SHA-1) specified in the Federal Informationpublication 180-1 and 180-2, and ISO/IEC 10118-3.SHA-1 provides a robust cryptographic solution toensure battery packs or other peripherals have beenmanufactured by authorized sources. The DS2704processes a host transmitted challenge and the 64-bit secret key stored on chip to produce a 160-bitresponse for transmission back to the host. Thesecret key is never transmitted between the batteryand the host.Applications2.5G/3G Wireless HandsetsDigital Still and Video CamerasHandheld or Notebook Computers and TerminalsPDAs