Battery Fuel Gauge for 1-Series Li-Ion Applications
Resides on System Main Board
- Works With Embedded or Removable Battery Packs
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
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
In a 12-Pin NanoFree™ (CSP) Packaging
APPLICATIONS
- Smartphones and PDAs
- Digital Still and Video Cameras
- Handheld Terminals
- MP3 or Multimedia Players

Impedance Track, NanoFree are trademarks of Texas Instruments.
I²C is a trademark of Philips Electronics.

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The Texas Instruments bq27505-J5 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 micro-controller firmware development. The bq27505-J5 resides on the system’s main board and manages an embedded battery (nonremovable) or a removable battery pack.

The bq27505-J5 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 gauging with the bq27505-J5 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 2.43mm × 1.96mm with 0.5mm lead pitch. It is ideal for space constrained applications.

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Technical documentation

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	Type	Title	Date
*	Datasheet	System Side Impedance Track Fuel Gauge - bq27505-J5 datasheet	Sep. 30, 2010
	Application note	Achieving The Successful Learning Cycle	Jun. 19, 2018
	Application note	Going to Production With the bq275xx (Rev. F)	Oct. 09, 2014
	Application note	Using I2C Communication With the bq275xx Series of Fuel Gauges (Rev. B)	May 15, 2014
	Application note	Going to Production With the bq275xx (Rev. E)	Jan. 20, 2012
	Application note	bq27505-J4 to bq27505-J5 Change List	May 09, 2011
	Application note	How to Generate Golden Image for Single-Cell Impedance Track(TM) Devices	Jan. 07, 2010
	Application note	Quick-Start Guide for bq27505 Family Gas Gauge	Aug. 08, 2009
	Application note	Single Cell Gas Gauge Application Book	Jul. 28, 2008
	Application note	Updating Firmware with the bq2750x and EVM. (Rev. A)	Jul. 22, 2008
	Application note	Impedance Track Fuel Gauge Accuracy Test for GSM Phone Applications	Mar. 21, 2008
	Application note	Single Cell Gas Gauge Circuit Design	Feb. 22, 2008
	Application note	Single Cell Impedance Track Printed-Circuit Board Layout	Feb. 22, 2008
	Application note	Theory and Implementation of Impedance Track Battery Fuel-Gauging Algorithm	Jan. 31, 2008
	White paper	Impedance Track Based Fuel Gauging	Sep. 27, 2007