DS2703_07 Datasheet, PDF (1/20 Pages) Dallas Semiconductor – SHA-1 Battery Pack Authentication IC

www.maxim-ic.com
GENERAL DESCRIPTION
The DS2703 provides a robust cryptographic solution
to ensure the authenticity of Li-Ion battery packs for
cell phone, PDA, and portable computing devices.
The DS2703 employs the Secure Hash Algorithm
(SHA-1) specified in the Federal Information
publication 180-1 and 180-2, and ISO/IEC 10118-3.
SHA-1 is designed for authentication⎯just what is
required for identifying battery packs manufactured
by authorized sources.
The device’s SHA-1 engine processes a host
transmitted challenge using its stored 64-bit secret
key and unique 64-bit ROM ID 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. A
DS2703-based system produces a high degree of
authentication security between a host system and its
removable battery or other peripheral devices.
The Thermistor Multiplexer feature allows a three
contact battery pack configuration to support data
and thermistor functions. When activated through
1-Wire command, the THM pin presents the
thermistor impedance on the data contact and
disconnects internal loading from the node.
TYPICAL OPERATING CIRCUIT
DS2703
SHA-1 Battery Pack
Authentication IC
FEATURES
ƒ Secure Challenge and Response Authentication
Using the SHA-1 Algorithm
ƒ Directly Powered by the Dallas 1-Wire^® Interface
with 16kbps Standard and 143kbps Overdrive
Communication Modes
ƒ Unique 64-Bit Serial Number
ƒ Thermistor Multiplexer
ƒ Operates with V_PULLUP as Low as 2.7V
ƒ Pb-Free 8-Pin μMAX^® or 2mm x 3mm TDFN
Package
PIN CONFIGURATION
APPLICATIONS
2.5G/3G Wireless Handsets
PDAs
Handheld or Notebook Computers and Terminals
Digital Still and Video Cameras
1-Wire is a registered trademark of Dallas Semiconductor.
µMAX is a registered trademark of Maxim Integrated Products.
ORDERING INFORMATION
PART
TEMP RANGE PIN-PACKAGE
DS2703G+
-20°C to +70°C 2mm x 3mm TDFN
DS2703G+T&R
-20°C to +70°C
DS2703G+ on
Tape-and-Reel
DS2703U+
-20°C to +70°C μMAX-8
DS2703U+T&R
-20°C to +70°C
DS2703U+ on
Tape-and-Reel
+ Denotes lead-free package.
Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device
may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata.
1 of 20
REV: 061307