Electronics Technology


Authentication IC for battery packs

9 February 2005 Electronics Technology

Dallas Semiconductor's DS2703, authentication IC, implements a challenge/response scheme, using the Secure Hash Algorithm (SHA-1), to authenticate a battery pack for a host system such as a cellphone, PDA, or other portable computing devices. Integrating the DS2703 in the battery pack allows the host to guard against unauthorised packs that could introduce unknown function or substandard operation. Using its stored 64-bit secret key and unique 64-bit ROM ID, the device processes a 64-bit host-transmitted challenge 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. The DS2703 integrates a thermistor multiplexor which allows a single battery pack contact to handle both data and thermistor functions.



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