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BQ27505-J2

更新时间： 2024-10-01 06:44:11
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德州仪器 - TI 仪表
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42页 816K
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System-Side Impedance Track™ Fuel Gauge

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BQ27505-J2 数据手册

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bq27505-J2  
System-Side Impedance Track™ Fuel Gauge  
www.ti.com  
SLUS924–APRIL 2009  
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  
•
•
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  
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  
microcontroller 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 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  
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.  
In a 12-Pin NanoFree™ (CSP) Packaging  
TYPICAL APPLICATION  
Host System  
LDO  
Single Cell Li-lon  
Battery Pack  
VCC  
Voltage  
Sense  
PACK+  
PROTECTION  
IC  
Battery  
Low  
Temp  
Sense  
I2C  
DATA  
T
Power  
bq27505  
Management  
Controller  
CHG  
DSG  
PACK-  
FETs  
BAT_GD  
SOC_INT  
Current  
Sense  
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, NanoFree are trademarks 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 © 2009, Texas Instruments Incorporated  
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