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BQ27500_08

更新时间： 2024-10-01 04:09:23
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德州仪器 - TI 仪表
页数 文件大小 规格书
39页 813K
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System-Side Impedance Track⑩ Fuel Gauge

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BQ27500_08 数据手册

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bq27500  
bq27501  
System-Side Impedance Track™ Fuel Gauge  
www.ti.com  
SLUS785D–SEPTEMBER 2007–REVISED APRIL 2008  
1 INTRODUCTION  
1.1 FEATURES  
1.2 APPLICATIONS  
•
Battery Fuel Gauge for 1-Series Li-Ion  
Applications  
•
•
•
•
•
Smartphones  
PDAs  
•
Resides on System Main Board  
Digital Still and Video Cameras  
Handheld Terminals  
MP3 or Multimedia Players  
–
Works With Embedded or Removable  
Battery Packs  
•
•
Two Varieties  
–
bq27500: Uses PACK+, PACK–, and T  
Battery Terminals  
1.3 DESCRIPTION  
–
bq27501: Works With Battery ID Resistor in  
Battery Pack  
The Texas Instruments bq27500/01 system-side  
Li-Ion battery fuel gauge is  
peripheral that provides fuel gauging for single-cell  
Li-Ion battery packs. The device requires little system  
microcontroller  
bq27500/01 resides on the system main board, and  
manages an embedded battery (non-removable) or a  
removable battery pack.  
a
microcontroller  
Microcontroller Peripheral Provides:  
–
–
Accurate Battery Fuel Gauging  
Internal Temperature Sensor for System  
Temperature Reporting  
firmware  
development.  
The  
–
–
–
–
Battery Low Interrupt Warning  
Battery Insertion Indicator  
Battery ID Detection  
96 Bytes of Non-Volatile Scratch-Pad  
FLASH  
The bq27500/01 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 Gauge Based on Patented  
Impedance Track™ Technology  
–
Models the Battery Discharge Curve for  
Accurate Time-to-Empty Predictions  
Battery fuel gauging with the bq27500 requires only  
PACK+ (P+), PACK– (P–), and Thermistor (T)  
connections to  
embedded battery. The bq27501 works with  
identification resistors in battery packs to gauge  
batteries of different fundamental chemistries and/or  
significantly different rated capacities.  
–
Automatically Adjusts for Battery Aging,  
Battery Self-Discharge, and  
a
removable battery pack or  
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  
TYPICAL APPLICATION  
Host System  
LDO  
Single-Cell Li-Ion  
Battery Pack  
Voltage  
Sense  
PACK+  
RID  
Battery  
Low  
Warning  
RID  
Sense*  
Protection  
IC  
Temp  
Sense  
Power  
Management  
Controller  
I2C  
T
bq27500/1  
CHG  
DSG  
Battery  
Good  
FETs  
PACK–  
Current  
Sense  
*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.  
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 © 2007–2008, Texas Instruments Incorporated  
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