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1 INTRODUCTION

1.1 FEATURES 1.2 APPLICATIONS

1.3 DESCRIPTION

HostSystem
SingleCellLi-Ion
BatteryPack
PACK-
PROTECTION
IC
CHG
DSG
Temp
Sense
Battery
Good
Current
Sense
I2C T
LDO
PACK+
Voltage
Sense
Battery
Low
Warning
FETs
bq27500/1
RID
RID
Sense*
*bq27501Only
Power
Management
Controller
bq27500
bq27501System-Side Impedance Track™ Fuel Gauge
SLUS785 – SEPTEMBER 2007
•Battery Fuel Gauge for 1-Series Li-Ion
•SmartphonesApplications
•PDAs•Resides on System Main Board
•Digital Still and Video Cameras– Works with Embedded or Removable
•Handheld TerminalsBattery Packs
•MP3 or Multimedia Players•Two Varieties
– bq27500: Uses PACK+,PACK-, and TBattery Terminals– bq27501: Includes Battery Pack ID Resistor(RID) Terminal
The Texas Instruments bq27500/01 System-SideLi-Ion Battery Fuel Gauge is a micro-controller•Micro-Controller Peripheral Provides:
peripheral that provides fuel gauging for single cell– Accurate Battery Fuel Gauging
Li-Ion battery packs. The device requires little system– Internal Temperature Sensor for System
micro-controller firmware development. TheTemperature Reporting
bq27500/01 resides on the system’s main board, and–Battery Low Interrupt Warning
manages an embedded battery (non-removable) or a–Battery Insertion Indicator
removable battery pack.– Battery ID Detection– 96 bytes of Non-Volatile Scratch Pad
The bq27500/01 uses the patented ImpedanceFLASH
Track™ algorithm for fuel gauging, and providesinformation such as remaining battery capacity•Battery Fuel Gauge Based on Patented
(mAh), state-of-charge (%), run-time to empty (min.),Impedance Track™ Technology
battery voltage (mV), and temperature ( °C).– Models the Battery Discharge Curve forAccurate Time-to-Empty Predictions
Battery fuel gauging with the bq27500 requires only– Automatically Adjusts for Battery Aging,
PACK+ (P+), PACK- (P-), and Thermistor (T)Battery Self Discharge, and
connections to a removable battery pack orTemperature/Rate Inefficiencies
embedded battery circuit. The bq27501 works with– Low Value Sense Resistor (10m Ωor Less)
identification resistors in battery packs, to gauge•I
2
C™ Interface for Connection to System
batteries of different fundamental chemistries and/orMicro-Controller Port
significantly different rated capacities.•12-Pin 2,5 mm ×4,0 mm SON Package
TYPICAL APPLICATION
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of TexasInstruments semiconductor products and disclaimers thereto appears at the end of this document.
Impedance Track is a trademark of Texas Instruments.I
2
C is a trademark of Philips Electronics.
UNLESS OTHERWISE NOTED this document contains
Copyright © 2007, Texas Instruments IncorporatedPRODUCTION DATA information current as of publication date.Products conform to specifications per the terms of TexasInstruments standard warranty. Production processing does notnecessarily include testing of all parameters.