The Texas Instruments bq27505-J4 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-J4 resides on the system’s main board and manages an embedded battery (nonremovable) or a removable battery pack.

The bq27505-J4 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-J4 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.

• 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 m 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

• Cell chemistry
• Li-Ion/Li-Polymer
• Number of series cells
• Single Cell
• Communication interface
• I2C
• Battery capacity (Min) (mAh)
• 300
• Battery capacity (Max) (mAh)
• 8000
• Implementation
• System
• External capacity indication
• None
• Features
• Impedance Track? algorithm
• Operating temperature range (C)
• -40 to 85
• Cell balancing
• —

BQ27505-J4的完整型号有：BQ27505YZGR-J4、BQ27505YZGT-J4，以下是这些产品的关键参数及官网采购报价：

BQ27505YZGR-J4，工作温度：-40 to 85，封装：DSBGA (YZG)-12，包装数量MPQ：3000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SNAGCU，TI官网BQ27505YZGR-J4的批量USD价格：3.128（1000+）

BQ27505YZGT-J4，工作温度：-40 to 85，封装：DSBGA (YZG)-12，包装数量MPQ：250个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SNAGCU，TI官网BQ27505YZGT-J4的批量USD价格：3.65（1000+）

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bqEvaluation/bqEVSW/bqEASY 工具可使用化学物质更新器安装程序中的数据，为您的电池组选择正确或最接近的化学鉴定文件。

bqStudio 可使用 Battery Management Studio (bqStudio) 中的化学物质更新 zip 文件数据，为您的电池组选择正确或最接近的化学鉴定文件。要获取最新的 bqStudio化学物质更新 zip 文件，可能需要使用 bqStudio 的更新版本。较早版本的 bqStudio 可能仅兼容较早版本的化学物质更新 zip 文件。请阅读 Battery Management Studio (bqStudio) 和 (...)