The DS2705 SHA-1 authentication master provides the master side of a secure hash algorithm-based (SHA) token authentication scheme and orchestrates the challenge-response sequence. This dedicated device eliminates the hard- and software development of a host implementation, thus greatly simplifying design efforts and reducing development time. Residing within the host, the DS2705 works with other battery-management SHA-1 token products that reside in the battery or accessory. These products include the DS2703 SHA-1 battery-pack authentication IC and the DS2704 1280-bit EEPROM with SHA-1 authentication. Authentication can be configured to initiate upon host demand or automatically when a battery or accessory is inserted into a system. The predetermined SHA-1 challenge-and-response pair is stored in the DS2705's nonvolatile EEPROM, which can be permanently locked to prevent corruption. The pass/fail status is reported on dedicated DS2705 port pins to signal the charge system or drive LEDs. The device comes in a 8-pin micro SOP or micro MAX(R) lead-free pack.
