BatteryPack

PACK-

PROTECTION

IC

PACK+

SDA

SCL

TS

bq27541-V200

LDO

REG25

REGIN

Vcc

SRP

SRN

SE

BAT

Vss

SHDQ

bq27541-V200

www.ti.com

SLUSA11 – FEBRUARY 2010

Single Cell Li-Ion Battery Fuel Gauge for Battery Pack Integration

Check for Samples: bq27541-V200

1

FEATURES

APPLICATIONS

•

Smartphones

23

•

Battery Fuel Gauge for 1-Series Li-Ion

Applications

•

PDAs

•

Digital Still and Video Cameras

•

Microcontroller Peripheral Provides:

•

Handheld Terminals

–

Accurate Battery Fuel Gauging

•

MP3 or Multimedia Players

–

Internal Temperature Sensor for System

Temperature Reporting

DESCRIPTION

–

SHA-1/HMAC Authentication

The Texas Instruments bq27541 Li-Ion battery fuel

–

Lifetime Data Logging

gauge is a microcontroller peripheral that provides

–

96 Bytes of Non-Volatile Scratch Pad

fuel gauging for single-cell Li-Ion battery packs. The

FLASH

device requires little system microcontroller firmware

•

Battery Fuel Gauging Based on Patented

development for accurate battery fuel gauging. The

bq27541 resides within the battery pack or on the

Impedance Track™ Technology

system’s main-board with an embedded battery

–

Models Battery Discharge Curve for

(nonremovable).

Accurate Time-To-Empty Predictions

The bq27541 uses the patented Impedance Track™

–

Automatically Adjusts for Battery Aging,

algorithm for fuel gauging, and provides information

Battery Self-Discharge, and

such

as

remaining

battery

capacity

(mAh),

Temperature/Rate Inefficiencies

state-of-charge (%), run-time to empty (min.), battery

–

Low-Value Sense Resistor (5m

Ω to 20mΩ)

voltage (mV), and temperature (°C).

•

The bq27541 also features integrated support for

Communication With Host System

secure

battery

pack

authentication,

using

the

•

Small 12-pin 2,5 mm × 4 mm SON Package

SHA-1/HMAC authentication algorithm.

TYPICAL APPLICATION

1

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 data sheet.

2

Impedance Track is a trademark of Texas Instruments.

3

PRODUCTION DATA information is current as of publication date.

Copyright © 2010, 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.