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[原创] Maxim MAX17260G超低功耗电池电量测量解决方案

关键词:工业测量 ModelGauge m5算法 电池电量测量 消费类电子 手持设备 可穿戴

时间:2019-09-23 13:46:54?????? 来源:中电网

Maxim公司的MAX17260G是能实现Maxim ModelGauge? m5算法的超低功耗电池电量测量集成电路,监测单颗电池,支持高边和低边电流检测.ModelGauge? m5算法由于消除了电池特征要求,简化了主软件交互而很容易实现电池电量测量.算法解决了大多数锂电池和应用时的电池差异性所带来的误差.算法组合了短期精度和基于电池电压的长期稳定性的电量计线性度,以及温度补偿以提供业界以流的电量计量精度.集成电路可自动补偿电池老化,温度和放电速率,提供精确的电荷状态(SOC)的百分比(%),在很宽的工作条件下以毫安时(mAh)计的剩余容量.主要用在可穿戴,老版香港彩霸王手表,平板电脑,2合1笔记本电脑,蓝牙耳机,健康和健身监视器,数码相机,视频和动作摄像机,医疗设备,手持电脑和终端,无线扬声器,家庭和建筑物自动化与传感器,手持游戏播放器和玩具.本文介绍了MAX17260G主要优势和特性,功能框图和应用框图,以及评估板MAX17260G和MAX17260X EVIT主要特性,电路图,材料清单和PCB设计图.

The MAX17260 is an ultra-low power fuel gauge IC whichimplements the Maxim ModelGauge? m5 algorithm. TheIC monitors a single-cell battery pack and supports bothhigh-side and low-side current sensing.

The ModelGauge m5 EZ algorithm makes fuel gauge implementationeasy by eliminating battery characterizationrequirements and simplifying host software interaction.The algorithm provides tolerance against battery diversityfor most lithium batteries and applications. The algorithmcombines the short-term accuracy and linearity of acoulomb counter with the long-term stability of a voltagebasedfuel gauge, along with temperature compensationto provide industry-leading fuel gauge accuracy. TheIC automatically compensates for cell-aging, temperature,discharge rate, and provides accurate state-of-charge(SOC) in percentage (%) and remaining capacity in milliampere-hours (mAh) over a wide range of operating conditions.

As the battery approaches the critical region nearempty, the algorithm invokes a special correction mechanismthat eliminates any error. The IC provides accurateestimation of time-to-empty and time-to-full and providesthree methods for reporting the age of the battery: reductionin capacity, increase in battery resistance, and cycleodometer.

The IC provides precision measurements of current, voltage,and temperature. The temperature of the batterypack is measured using an internal temperature sensor or external thermistor. A 2-wire I2C interface provides accessto data and control registers. The IC is available in tinylead-free 0.4mm pitch, 1.5mm x 1.5mm, 9-pin WLP package and 3mm x 3mm, 14-pin TDFN package.

MAX17260G主要优势和特性:

● ModelGauge m5 EZ
● No Characterization Required for EZ Performance
●?Robust Against Battery Variation
●?Eliminates Error Near Empty Voltage
●?Eliminates Coulomb-Counter Drift
●?Compensates for Age, Current, and Temperature
●?Does Not Require Empty, Full, or Idle States
● Low 5.1μA Operating Current
● Accurate Current Sensing
●?High-Side or Low-Side Sensing Option
● Wide Sense Resistor Range: 1mΩ to 1000mΩ
● Trace Sensing with Temperature Compensation
● Supports Li+ and Variants Including LiFePO4
● Thermistor or ±1°C Internal Temperature
● Dynamic Power Estimates Power Capability DuringDischarge
● Time-to-Empty and Time-to-Full Estimation
● Predicts Remaining Capacity Under Theoretical Load
● No Calibration Required
● Alert Indicator for Voltage, SOC, Temperature,Current, and 1% SOC Change

MAX17260G应用:

● Wearables, Smartwatches
● Tablets, 2-in-1 Laptops
● Bluetooth Headsets
● Health and Fitness Monitors
● Digital Still, Video, and Action Cameras
● Medical Devices
● Handheld Computers and Terminals
● Wireless Speakers
● Home and Building Automation, Sensors
● Portable Game Players
● Toys

图1.MAX17260G简化电量电路图

图2.MAX17260G功能框图

图3.MAX17260G低边电流测量应用电路图

图4.MAX17260G高边电流测量应用电路图

评估板MAX17260XEVKIT

The MAX17260G/MAX17260X evaluation kits (EV kits) are fully assembled and tested surface-mount PCBs that evaluate the stand-alone ModelGauge? m5 host-side fuel-gauge ICs for lithium-ion (Li+) batteries in handheld and portable equipment.

The MAX17260G/MAX17260X EV kits include the Maxim DS91230+ USB interface, IC evaluation board, and RJ-11 connection cable. Windows?-based graphical user interface (GUI) software is available for use with the EV kits and can be downloaded from Maxim’s website at www.maximintegrated.com/en/products/power
/battery-management/MAX17260.html
(under the Design Resources tab). Windows 7 or newer Windows operating system is required to use with the EV kit GUI software.

图5.评估板MAX17260XEVKIT外形图

评估板MAX17260XEVKIT主要特性:

ModelGauge m5 Algorithm
Monitors from 1S Cell Packs
Battery Pack Input Voltage Range of +2.3V to +4.9V
Thermistor Measurement Network
Optional On-Board PCB Trace Sense Resistor
Windows 7 or Newer Compatible Software
Proven PCB Layout
Fully Assembled and Tested

评估板MAX17260XEVKIT应用:

Bluetooth Headsets
Digital Still, Video, and Action Cameras
Handheld Computers and Terminals
Health and Fitness Monitors
Home and Building Automation, Sensors
Medical Devices
Portable Game Players
Tablets, 2-in-1 Laptops
Toys
Wearables, Smartwatches
Wireless Speakers

图6.评估板MAX17260EVKIT连接图

图7.评估板MAX17260G EVKIT电路图
评估板MAX17260G EVKIT材料清单:


图8.评估板MAX17260C EVKIT PCB设计图:左:顶层丝印;右:顶层布局

图9.评估板MAX17260G EVKIT PCB设计图:底层

图10.评估板MAX17260XEVKIT电路图
评估板MAX17260XEVKIT材料清单:


图11.评估板MAX17260XEVKIT PCB设计图:左:顶层丝印;右:顶层布局

图12.评估板MAX17260XEVKIT PCB设计图:底层布局
详情请见:
https://datasheets.maximintegrated.com/en/ds/MAX17260.pdf
https://datasheets.maximintegrated.com/en/ds/MAX17260GEVKIT-MAX17260XEVKIT.pdf
MAX17260.pdf
MAX17260GEVKIT-MAX17260XEVKIT.pdf

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