BQ27500-V120 Datasheet, PDF (1/36 Pages) Texas Instruments – System-Side Impedance Track™ Fuel Gauge

bq27500-V120
www.ti.com
1 INTRODUCTION
System-Side Impedance Track™ Fuel Gauge
SLUS880 – OCTOBER 2008
1.1 FEATURES
• Battery Fuel Gauge for 1-Series Li-Ion
Applications
• Resides on System Main Board
– Works with Embedded or Removable
Battery Packs
• Uses PACK+, PACK–, and T Battery Terminals
• Microcontroller Peripheral Provides:
– Accurate Battery Fuel Gauging
– Internal Temperature Sensor for System
Temperature Reporting
– Battery Low Interrupt Warning
– Battery Insertion Indicator
– 96 Bytes of Non-Volatile Scratch-Pad
FLASH
• Battery Fuel Gauge Based on Patented
Impedance Track™ Technology
– Models the Battery Discharge Curve for
Accurate Time-to-Empty Predictions
– Automatically Adjusts for Battery Aging,
Battery Self-Discharge, and
Temperature/Rate Inefficiencies
– Low-Value Sense Resistor (10 mΩ or Less)
• I²C™ Interface for Connection to System
Microcontroller Port
• 12-Pin 2,5-mm × 4-mm SON Package
1.2 APPLICATIONS
• Smartphones
• PDAs
• Digital Still and Video Cameras
• Handheld Terminals
• MP3 or Multimedia Players
1.3 DESCRIPTION
The Texas Instruments bq27500 system-side Li-Ion
battery fuel gauge is a microcontroller peripheral that
provides fuel gauging for single-cell Li-Ion battery
packs. The device requires little system
microcontroller firmware development. The bq27500
resides on the system main board, and manages an
embedded battery (non-removable) or a removable
battery pack.
The bq27500 uses the patented Impedance Track™
algorithm for fuel gauging, and provides information
such as remaining battery capacity (mAh),
state-of-charge (%), run-time to empty (min.), battery
voltage (mV), and temperature (°C).
Battery fuel gauging with the bq27500 requires only
PACK+ (P+), PACK– (P–), and Thermistor (T)
connections to a removable battery pack or
embedded battery.
TYPICAL APPLICATION
Power
Management
Controller
Host System
LDO
Battery
Voltage
Sense
Low
Warning
Temp
I²C
Sense
bq27500
Battery
Good
Current
Sense
PACK+
T
PACK–
Single-Cell Li-Ion
Battery Pack
Protection
IC
FETs
CHG
DSG
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.
I²C is a trademark of Philips Electronics.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2008, Texas Instruments Incorporated