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TI 公司的bq27741-G1是用于单个电池组的锂电池电量检测集成电路,提供计于硬件的过压和欠压保护,充电时的过流保护以及短路保护.采用专利的Impedance Track™算法,提供剩余容量(mAh),充电状态(%),剩余工作时间,电池电压(mV)和温度(℃),主要用在智能手机,PDA,数码相机和摄像机,手持终端,MP3或多媒体播放器.本文介绍了bq27741-G1主要特性,两种参考应用电路以及bq27741-G1评估模块(EVM)特性, 和电池与系统负载/充电器连接图,电路图,材料清单和PCB元件布局图.
The Texas Instruments bq27741-G1 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 fuel gauge resides within the battery pack or on the system’s main board with an embedded battery (non-removable). The fuel gauge provides hardware-based over- and undervoltage, overcurrent in charge or discharge, and short-circuit protections.
The fuel gauge 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 (minimum), battery voltage (mV), and temperature (°C), as well as recording vital parameters throughout the lifetime of the battery.
The CSP is a 15-ball package (2.776 mm × 1.96 mm) that is ideal for space-constrained applications.
bq27741-G1主要特性:
Battery Fuel Gauge and Protector for 1-Series Li-Ion Applications
Microcontroller Peripheral Provides:
Accurate Battery Fuel Gauging Supports up to 32 Ahr
External and Internal Temperature Sensors for Battery
Temperature Reporting
Precision 16-bit High-Side Coulomb Counter with
High-Side Low-Value Sense Resistor (5 mΩ to 20 mΩ)
Lifetime and Current Data Logging
64 Bytes of Non-Volatile Scratch Pad Flash
SHA-1/HMAC Authentication
Battery Fuel Gauging Based on Patented Impedance Track Technology
Models Battery Discharge Curve for Accurate Time-To-Empty Predictions
Automatically Adjusts for Aging, Self-Discharge, and Temperature- and Rate-Induced Effects on Battery
Advanced Fuel Gauging Features
Internal Short Detection
Tab Disconnection Detection
Safety and Protection:
Over- and Undervoltage Protection with Brown-out Low-Power Mode
Overcharging and Discharging Current Protection
Overtemperature Protection
Short-Circuit Protection
Low-Voltage Notification
Voltage Doubler to Support High-side NFET Protection
HDQ and I2C Interface Formats for Communication With Host System
Small 15-ball NanoFree (CSP) Packaging
bq27741-G1应用:
Smartphones
PDAs
Digital Still and Video Cameras
Handheld Terminals
MP3 or Multimedia Players
图1. bq27741-G1参考电路:I2C模式
图2. bq27741-G1参考电路:HDQ模式
bq27741-G1评估模块(EVM)
This evaluation module (EVM) is a complete evaluation system for the bq27741-G1. The EVM includes one bq27741 circuit module, a current sense resistor, two thermistors, and two protection N-FETs. An EV2400 PC interface board and a PC USB cable are required for gas gauge interface, but must be ordered separately. The circuit module includes one bq27741 integrated circuit and all other onboard components necessary to monitor and predict capacity for a pack-side fuel gauge solution and to perform the protection. The circuit module connects directly across the battery cell. With the EV2400 interface
board and software, the user can read the bq27741 data registers, program the chipset for different pack configurations, log cycling data for further evaluation, and evaluate the overall functionality of the bq27741 solution under different charge and discharge conditions. The latest Windows™-based PC software can be downloaded from the product folder on the Texas Instruments Web site.
bq27741-G1评估模块(EVM)特性:
• Complete evaluation system for the bq27741 gas gauge with Impedance Track™ Technology
• Populated circuit module for quick setup
• Personal computer (PC) software and interface board for easy evaluation
• Software that allows data logging for system analysis
• Ability to upgrade to the latest firmware version by flash reprogramming
图3.bq27741-G1评估模块(EVM)外形图
图4.bq27741-G1评估模块(EVM)和电池与系统负载/充电器连接图
图5.bq27741-G1评估模块(EVM)电路图
bq27741-G1评估模块(EVM)材料清单(BOM):
图6.bq27741-G1评估模块(EVM)元件布局图
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