DS2703U+T&R; datasheet, PDF - EEWORLD Datasheet

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DS2703U+T&R;: DescriptionIC BATT AUTHENTICATE SHA-1 8UMAX; Categorysemiconductor Power management; File Size372KB，20 Pages; ManufacturerMaxim; Websitehttps://www.maximintegrated.com/en.html; Environmental Compliance

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DS2703U+T&R; Overview

IC BATT AUTHENTICATE SHA-1 8UMAX

DS2703U+T&R; Parametric

Parameter Name	Attribute value
Function	Battery verification
battery chemistry	lithium ion
Number of batteries	-
failsafe	-
interface	1 line
Operating temperature	-20°C ~ 70°C（TA）
Package/casing	8-TSSOP, 8-MSOP (0.118", 3.00mm wide)
Supplier device packaging	8-uMAX

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DS2703

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.

FEATURES

Secure Challenge and Response Authentication

Using the SHA-1 Algorithm

Directly Powered by the Dallas 1-Wire

Interface

with 16kbps Standard and 143kbps Overdrive

Communication Modes

Unique 64-Bit Serial Number

Thermistor Multiplexer

Operates with V

PULLUP

as Low as 2.7V

Pb-Free 8-Pin

μMAX

or 2mm x 3mm TDFN

Package

PIN CONFIGURATION

TYPICAL OPERATING CIRCUIT

APPLICATIONS

2.5G/3G Wireless Handsets

PDAs

Handheld or Notebook Computers and Terminals

Digital Still and Video Cameras

ORDERING INFORMATION

PART

DS2703G+

DS2703G+T&R

DS2703U+

1-Wire is a registered trademark of Dallas Semiconductor.

µMAX is a registered trademark of Maxim Integrated Products.

TEMP RANGE

-20°C to +70°C

DS2703U+T&R

PIN-PACKAGE

2mm x 3mm TDFN

DS2703G+ on

Tape-and-Reel

μMAX-8

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.

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REV: 061307

DS2703 SHA-1 Battery Pack Authentication IC

DETAILED DESCRIPTION

The DS2703 is comprised of a SHA-1 Authentication function and thermistor mux control that are accessed via a 1-

Wire interface. The high voltage (HV) detection circuit routes the externally supplied programming voltage to the

EEPROM array and enables the internal regulator to isolate portions of the chip from the programming voltage. The

1-Wire interface controls access by a host system to the 64-bit Net Address (ROM ID) and SHA-1 Authentication.

The DS2703 operates in one of four operating modes: communication, computation, programming and thermistor

access. Most operations are performed in communication mode, with the host system addressing the DS2703

using Net Address commands and then setting up an authentication exchange and retrieving the results. In

communication mode, the DQ load current is no more than

DQ0

maximum, and the DS2703 can be “parasite”

powered via the DQ pin through a high impedance pullup resistor during a communication transaction. Power

available while the 1-Wire bus is at a logic high is rectified by the on chip diode and stored in an off chip capacitor

connected to the VB pin.

In computation mode, when a SHA-1 verification is performed, the DQ load current increases up to

DQ2

necessitating a lower impedance pullup resistor. The computation mode load current occurs after the host supplies

the required challenge data and requests the computation using the proper function commands in communication

mode. In this mode, the pullup supply and low impedance pullup resistor must be capable of keeping the DQ pin

above V

PULLUP-MIN

The third operating mode is required when programming the non-volatile memory portions of the DS2703. The

programming mode is defined by the application of a high voltage programming pulse to the DQ pin at the

appropriate point during a Compute Secret command, Load/Lock Secret or Clear/Set Overdrive Timing command.

The internal voltage regulator limits the internal voltage (V

DD_INT

) to isolate low voltage portions of the chip from the

HV programming pulse. Typically, programming mode is used during module or pack manufacture to configure the

DS2703 and program the 64-bit secret.

Finally, thermistor mode allows the voltage on an external thermistor to be measured from the DQ line. The

command sequence causes the DS2703 to internally disconnect its DQ interface and drive the THM pin to VSS

allowing the measurement to be made. The IC remains in this mode until the VB pin capacitor is drained causing

the DS2703 to power cycle back to communication mode.

AUTHENTICATION

Authentication is performed using a FIPS-180 compliant SHA-1 one way hash algorithm on a 512 bit message

block. The message block consists of a 64-bit secret, a 64-bit challenge and 384 bits of constant data. Optionally,

the 64-bit net address replaces 64 of the 384 bits of constant data used in the hash operation. An authentication

attempt is initiated by the host system providing a 64-bit random challenge then sending one of two compute

command sequences. The host and the DS2703 both calculate the result based on the mutually known secret. The

result data, known as the Message Authentication Code (MAC) or Message Digest, is returned by the DS2703 for

comparison to the host’s result. Note that the secret is never transmitted on the bus and thus cannot be captured

by observing bus traffic. SHA-1 based authentication is a cryptographically strong method in wide use for digitally

signing encrypted files and secure transactions such as electronic cash and password exchange protocols.

The FIPS 180 Compliant Input Block, the 512-bit message block is organized as sixteen 32-bit words, W0-W15.

The message block is initialized when a command is received to compute the MAC. Upon initialization, the 64-bit

secret is loaded, and it is important to note that the SHA-1 algorithm has access to this data, but not the serial

interface. The challenge data is received with the command just prior to the compute MAC command. The

challenge data is cleared during computation of the MAC, so the host must write new challenge data prior to

issuing each Compute MAC or Compute Next Secret command. Additionally, the A, B, C, D and E variables used

in the hash computation are initialized per FIPS 180 as shown in Table 1. Variable Initiation. Please contact the

factory for memory map details.

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DS2703U+T&R; Related Products

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