BQ27505-J3 Datasheet, PDF (1/44 Pages) Texas Instruments – System-Side Impedance Track™ Fuel Gauge

Not Recommended for New Designs
bq27505-J3
www.ti.com
SLUS986A – OCTOBER 2009 – REVISED FEBRUARY 2010
System-Side Impedance Track™ Fuel Gauge
1 INTRODUCTION
1.1 FEATURES
•123 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 Battery
Temperature Reporting
– Battery Low Interrupt Warning
– Battery Insertion Indicator
– Configurable Level of State of Charge (SOC)
Interrupts
– State of Health 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)
• 400-kHz I²C™ Interface for Connection to
System Microcontroller Port
• In a 12-Pin NanoFree™ (CSP) Packaging
1.2 APPLICATIONS
• Smartphones
• PDAs
• Digital Still and Video Cameras
• Handheld Terminals
• MP3 or Multimedia Players
1.3 DESCRIPTION
The Texas Instruments bq27505 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 micro-
controller firmware development. The bq27505
resides on the system’s main board and manages an
embedded battery (non-removable) or a removable
battery pack.
The bq27505 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), temperature (°C) and state of health (%).
Battery fuel gauging with the bq27505 requires only
PACK+ (P+), PACK– (P–), and Thermistor (T)
connections to a removable battery pack or
embedded battery circuit. The CSP option is a 12-ball
package in the dimensions of 2,43 mm × 1,96 mm
with 0,5 mm lead pitch. It is ideal for space
constrained applications.
TYPICAL APPLICATION
Power
Management
Controller
Host System
LDO
VCC
Battery
Low
Voltage
Sense
I2C
DATA
Temp
Sense
bq27505
BAT_GD
SOC_INT
Current
Sense
PACK+
T
PACK-
Single Cell Li-lon
Battery Pack
PROTECTION
IC
FETs
CHG
DSG
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.
Impedance Track, NanoFree are trademarks of Texas Instruments.
2
I²C is a trademark of Philips Electronics.
3
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 © 2009–2010, Texas Instruments Incorporated