BQ27541-V200_1007 Datasheet, PDF (1/43 Pages) Texas Instruments – Single Cell Li-Ion Battery Fuel Gauge for Battery Pack Integration

bq27541-V200
www.ti.com
SLUSA11 – FEBRUARY 2010
Single Cell Li-Ion Battery Fuel Gauge for Battery Pack Integration
Check for Samples: bq27541-V200
FEATURES
1
•23 Battery Fuel Gauge for 1-Series Li-Ion
Applications
• Microcontroller Peripheral Provides:
– Accurate Battery Fuel Gauging
– Internal Temperature Sensor for System
Temperature Reporting
– SHA-1/HMAC Authentication
– Lifetime Data Logging
– 96 Bytes of Non-Volatile Scratch Pad
FLASH
• Battery Fuel Gauging Based on Patented
Impedance Track™ Technology
– Models 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 (5mΩ to 20mΩ)
• HDQ and I²C™ Interface Formats for
Communication With Host System
• Small 12-pin 2,5 mm × 4 mm SON Package
APPLICATIONS
• Smartphones
• PDAs
• Digital Still and Video Cameras
• Handheld Terminals
• MP3 or Multimedia Players
DESCRIPTION
The Texas Instruments bq27541 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 for accurate battery fuel gauging. The
bq27541 resides within the battery pack or on the
system’s main-board with an embedded battery
(nonremovable).
The bq27541 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).
The bq27541 also features integrated support for
secure battery pack authentication, using the
SHA-1/HMAC authentication algorithm.
TYPICAL APPLICATION
PACK+
Battery Pack
SHDQ
SDA
SCL
Vcc
REGIN LDO _REG25
BAT
SE
TS
bq27541-V200
SRP
PACK-
PROTECTION
IC
SRN
Vss
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 is a trademark of Texas Instruments.
2
I²C is a trademark of Phillips Corporation.
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 © 2010, Texas Instruments Incorporated