DS2705_07 Datasheet, PDF (1/18 Pages) Dallas Semiconductor – SHA-1 Authentication Master

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GENERAL DESCRIPTION
The DS2705 provides the master side of a Secure
Hash Algorithm (SHA) based token authentication
scheme. Hardware-based SHA authentication allows
for security without the added cost and complexity of
a microprocessor-based system. Batteries and other
accessories are authenticated using a single contact
through the Dallas 1-Wire® interface. Authentication
is performed on demand or automatically, with the
pass/fail status reported on open-drain output pins to
signal the charge system and/or drive LEDs. The
DS2705 stores a predetermined challenge-and-
response pair in nonvolatile (NV) EEPROM. The
DS2705 works in conjunction with Dallas Battery
Management SHA-1 token products, including the
DS2703 and DS2704.
APPLICATIONS
Digital Cameras
Portable DVD and Media Players
Cradle and Accessory Chargers
Cell Phones/Smartphones
APPLICATION EXAMPLE
DS2705
SHA-1 Authentication Master
PIN CONFIGURATION
CHAL
PASS
FAIL
VSS
1
8
2
7
3
6
4
5
μMAX
VDD
MDQ
SDQ
VPP
FEATURES
ƒ Initiates Challenge-and-Response
Authentication based on the SHA-1 Algorithm
ƒ Dallas 1-Wire Master/Slave Interface Operates
at Standard and Overdrive Speeds
ƒ Input and Output pins for Initiating Challenge
and Reporting Authentication Pass/Fail
ƒ Programmable Configuration
ƒ Operates from 2.5V to 5.5V Supply
ƒ Tiny μMAX Package (Pb-Free)
ORDERING INFORMATION
PART
TEMP RANGE
DS2705U+
-20°C to +85°C
MARKING
D2705
PIN-PACKAGE
μMAX
DS2705U+/T&R -20°C to +85°C
D2705
DS2705U+ in Tape-and-Reel
+ Denotes lead-free package.
1-Wire is a registered trademark of Dallas Semiconductor.
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