Product category:
Power Supply ICs and Controllers
News Release from: Maxim Integrated Products | Subject: DS2703
Edited by the Electronicstalk Editorial
Team on 27 January 2005
Chip checks battery pack authenticity
The DS2703 battery pack authentication IC implements a challenge/response scheme using the Secure Hash Algorithm to authenticate a battery pack for a host system.
The DS2703 is a battery pack authentication IC that implements a challenge/response scheme using the Secure Hash Algorithm (SHA-1) specified in the Federal Information Publication 180-1/2 and ISO/IEC 10118-3, 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, and even cause harm to the user
This article was originally published on Electronicstalk on 27 Aug 2002 at 8.00am (UK)
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Using its stored 64bit secret key and unique 64bit ROM ID, the DS2703's SHA-1 engine processes a 64bit host-transmitted challenge to produce a 160bit 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.
This produces a high degree of authentication security between a host system and its battery pack or other peripheral devices.
The DS2703 integrates a thermistor multiplexor which allows a single battery pack contact to handle both data and thermistor functions.
This feature saves both space and cost by enabling the use of only three contacts between the pack and host: pack+, pack- and data/thermistor.
This data/thermistor contact also serves as the power line to the device because the DS2703 is directly powered through its 1-Wire data interface.
Typical applications for the DS2703 include wireless handsets, PDAs, handheld computers, digital still cameras, and digital video cameras.
The device is available in a tiny 8-pin microSOP package.
Prices start at $0.77 (10,000-up, FOB USA).
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