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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
bq27501
System-Side Impedance Track™ Fuel Gauge
SLUS785 – SEPTEMBER 2007
•
Battery Fuel Gauge for 1-Series Li-Ion
•
Smartphones
Applications
•
PDAs
•
Resides on System Main Board
•
Digital Still and Video Cameras
–
Works with Embedded or Removable
•
Handheld Terminals
Battery Packs
•
MP3 or Multimedia Players
•
Two Varieties
–
bq27500: Uses PACK+, PACK-, and T
Battery Terminals
–
bq27501: Includes Battery Pack ID Resistor
(RID) Terminal
The Texas Instruments bq27500/01 System-Side
Li-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.
The
Temperature 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
Impedance
FLASH
Track™ algorithm for fuel gauging, and provides
information
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 for
Accurate 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
or
Temperature/Rate Inefficiencies
embedded battery circuit. The bq27501 works with
–
Low Value Sense Resistor (10m
Ω
or Less)
identification resistors in battery packs, to gauge
•
I
2
C™ Interface for Connection to System
batteries of different fundamental chemistries and/or
Micro-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 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.
UNLESS
OTHERWISE
NOTED
this
document
contains
Copyright © 2007, Texas Instruments Incorporated
PRODUCTION DATA information current as of publication date.
Products conform to specifications per the terms of Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
