1 of 20

REV: 071805

Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device

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

¾just 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

VSS

DQ

DATA

PACK +

PACK -

VB

150

W

Li-Ion

Protection

THM

BATTERY PACK

0.22

mF

FEATURES

Using the SHA-1 Algorithm

with 16kpbs Standard and 143kpbs Overdrive

Communication Modes

ORDERING INFORMATION

PART

TEMP RANGE

PIN-PACKAGE

DS2703U

-20

°C to +70°C

mMax-8

DS2703U/T&R

-20

°C to +70°C

DS2703U on

Tape-and-Reel

DS2703U+

-20

°C to +70°C

mMax-8

DS2703U+T&R

-20

°C to +70°C

DS2703U+ on

Tape-and-Reel

+ Denotes lead-free package.

APPLICATIONS

2.5G/3G Wireless Handsets

PDAs

Handheld or Notebook Computers and Terminals

Digital Still and Video Cameras

PIN CONFIGURATION

DS2703

SHA-1 Battery Pack

Authentication IC

www.maxim-ic.com

TOP VIEW

mMAX

DS2703U+

VSS

NC

NC

NC

NC

VB

DQ

THM

6

8

7

5

3

1

2

4

1-Wire is a registered trademark of Dallas Semiconductor.