The Texas Instruments bq27541 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 for accurate battery fuel gauging. The bq27541 resides within the battery pack or on the system’s main-board with an embedded battery (nonremovable).

The bq27541 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).

The bq27541 also features integrated support for secure battery pack authentication, using the SHA-1/HMAC authentication algorithm.

• Battery Fuel Gauge for 1-Series Li-Ion Applications
• Microcontroller Peripheral Provides:
  • Accurate Battery Fuel Gauging
  • Internal Temperature Sensor for System Temperature Reporting
  • SHA-1/HMAC Authentication
  • 96 Bytes of Non-Volatile Scratch Pad FLASH
• Battery Fuel Gauging Based on Patented Impedance Track? Technology
  • Models 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 (5 m to 20 m)
• HDQ and I2C? Interface Formats for Communication with Host System
• Small 12-pin 2,5 mm × 4 mm SON Package
• APPLICATIONS
  • Smartphones
  • PDAs
  • Digital Still and Video Cameras
  • Handheld Terminals
  • MP3 or Multimedia Players

Impedance Track is a trademark of Texas Instruments. I2C is a trademark of Phillips Corporation.

• Cell chemistry
• Li-Ion/Li-Polymer
• Number of series cells
• Single Cell
• Communication interface
• HDQ, I2C
• Battery capacity (Min) (mAh)
• 300
• Battery capacity (Max) (mAh)
• 8000
• Implementation
• Pack
• External capacity indication
• None
• Features
• Impedance Track? algorithm, SHA-1 Authentication
• Operating temperature range (C)
• -40 to 85
• Cell balancing
• —

BQ27541的完整型号有：BQ27541DRZR、BQ27541DRZT，以下是这些产品的关键参数及官网采购报价：

BQ27541DRZR，工作温度：-40 to 85，封装：SON (DRZ)-12，包装数量MPQ：3000个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网BQ27541DRZR的批量USD价格：2.749（1000+）

BQ27541DRZT，工作温度：-40 to 85，封装：SON (DRZ)-12，包装数量MPQ：250个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网BQ27541DRZT的批量USD价格：3.189（1000+）

BQ27541EVM — BQ27541 单节电池 Impedance Track™ 技术评估模块

此评估模块 (EVM) 是适用于 bq27541 的完整评估系统。该 EVM 包含一个 bq27541 电路模块、一个电流感应电阻、一个热敏电阻、一个用于电量监测计接口的 EV2300 个人计算机 (PC) 接口板、一根 PC USB 电缆和基于 Windows™ 的 PC 软件。该电路模块包含一个 bq27541 集成电路 (IC)，还包含监控和预测容量所需的所有其它板载组件。该电路模块直接与电池组中的电池相连。借助 EV2300 接口板和软件，用户可以读取 bq27541 数据寄存器、对适用于不同数据包配置的芯片组进行编程、记录循环数据以便进一步评估，并对 bq27541 (...)

GASGAUGECHEM-SW — 电量监测计化学物更新器

The Linux driver supports the BQ27x series of Battery Fuel Gauges. The Linux driver supports communication through the I2C/HDQ bus and interfaces with the power supply sub-system to monitor battery properties.

Linux Mainline Status

Available in Linux Main line: Yes
Available through git.ti.com: N/A

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USB Drivers for Windows XP and Windows 7 (32-bit OS only) (Rev. A)

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 (...)