www.ti.com

1

INTRODUCTION

1.1 FEATURES

1.2

APPLICATIONS

1.3

DESCRIPTION

PACK+

SCLK

SDATA

LDO

PACK-

*

*OptionalThermistor

Single-Cell

Protector

bq27350

ImpedanceTrack™

SHA-1/HMAC

Authenticationand

Manufacturing

DataStorage

bq26100

SHA-1/HMAC

Authentication

(optional)

bq27350

Single Cell Li-Ion Battery Manager

With Impedance Track Fuel Gauge Technology

SLUS754 – MARCH 2007

• Comprehensive Battery Fuel Gauge for Single

• POS Terminals

Cell and 1-Series Li-Ion Applications

• Industrial Data Collection

• Secure Battery Authentication Using

• Smartphones

SHA-1/HMAC Encryption

• PDAs

• Calculates and Reports

• Digital Cameras

–

Remaining Battery Capacity

• Handheld Terminals

–

Battery Voltage and Temperature

–

Charge and Discharge Current

–

Four Time-to-Empty Predictions

• Battery Fuel Gauge Based on Patented

The Texas Instruments’ bq27350 is a battery fuel

Impedance Track™ Technology

gauge with secure authentication support for single

–

Models the Battery Discharge Curve for

cell Li-Ion battery packs. Designed for battery pack

Accurate Time-to-Empty Predictions

integration,

the

device

requires

little

host

–

Automatically Adjusts for Battery Aging,

microcontroller firmware support for implementation.

Battery Self Discharge, and

The system host processor communicates with the

Temperature/Rate Inefficiencies

–

Low Value Sense Resistor (10m

Ω or Less)

battery capacity, system run-time predictions, and

• 96-Bytes Non-Volatile Scratch Pad Data

other critical battery information.

Memory

The bq27350 uses the patented Impedance Track™

algorithm for its fuel gauging. The gauge provides

• 20-Pin TSSOP Package

information such as state-of-charge (%), run-time to

empty (min.), charge time to full (min.), battery

voltage (V), and pack temperature (

°C).

The bq27350 also features both integrated and

external

support

for

secure

battery

pack

authentication, using the SHA-1/HMAC authentication

algorithm.

TYPICAL IMPLEMENTATION

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this document.

Impedance Track is a trademark of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Copyright © 2007, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.