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BQ27500 Datasheet

  • BQ27500

  • Texas Instruments [System-Side Impedance Track￠a Fuel Gaug...

  • TI

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bq27500
bq27501
System-Side Impedance Track鈩?Fuel Gauge
www.ti.com
SLUS785D 鈥?SEPTEMBER 2007 鈥?REVISED APRIL 2008
1 INTRODUCTION
1.1 FEATURES
鈥?/div>
鈥?/div>
Battery Fuel Gauge for 1-Series Li-Ion
Applications
Resides on System Main Board
鈥?Works With Embedded or Removable
Battery Packs
Two Varieties
鈥?bq27500: Uses
PACK+, PACK鈥?
and
T
Battery Terminals
鈥?bq27501: Works With Battery ID Resistor in
Battery Pack
Microcontroller Peripheral Provides:
鈥?Accurate Battery Fuel Gauging
鈥?Internal Temperature Sensor for System
Temperature Reporting
鈥?/div>
Battery Low
Interrupt Warning
鈥?/div>
Battery Insertion
Indicator
鈥?Battery ID Detection
鈥?96 Bytes of Non-Volatile Scratch-Pad
FLASH
Battery Fuel Gauge Based on Patented
Impedance Track鈩?Technology
鈥?Models the Battery Discharge Curve for
Accurate Time-to-Empty Predictions
鈥?Automatically Adjusts for Battery Aging,
Battery Self-Discharge, and
Temperature/Rate Inefficiencies
鈥?Low-Value Sense Resistor (10 m鈩?or Less)
I
2
C鈩?Interface for Connection to System
Microcontroller Port
12-Pin 2,5-mm
脳
4-mm SON Package
1.2
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
APPLICATIONS
鈥?/div>
Smartphones
PDAs
Digital Still and Video Cameras
Handheld Terminals
MP3 or Multimedia Players
1.3
DESCRIPTION
鈥?/div>
The Texas Instruments bq27500/01 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
bq27500/01 resides on the system main board, and
manages an embedded battery (non-removable) or a
removable battery pack.
The bq27500/01 uses the patented Impedance
Track鈩?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 (擄C).
Battery fuel gauging with the bq27500 requires only
PACK+ (P+), PACK鈥?(P鈥?, and Thermistor (T)
connections to a removable battery pack or
embedded battery. The bq27501 works with
identification resistors in battery packs to gauge
batteries of different fundamental chemistries and/or
significantly different rated capacities.
鈥?/div>
鈥?/div>
鈥?/div>
TYPICAL APPLICATION
Host System
LDO
Single-Cell Li-Ion
Battery Pack
Voltage
Sense
PACK+
RID
Protection
IC
Battery
Low
Warning
Power
Management
Controller
I C
2
RID
Sense*
Temp
Sense
bq27500/1
T
FETs
Battery
Good
Current
Sense
PACK鈥?/div>
CHG
DSG
*bq27501 Only
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.
I
2
C 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 漏 2007鈥?008, Texas Instruments Incorporated

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