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[原创] Maxim MAX17263MdelGauge m5 EZ算法池电量检测解决方案

关键词:电源管理 消费类电子 无疗设备 电动工具 MAX17263

时间:2018-09-19 10:56:29       作者:Maxim       来源:中电网

Maxim公司的MAX17263是超低功耗的具有ModelGauge m5 EZ算法的电量集成电路,采用外接电阻分压器可对单电池或多电池组进行检测,并对电池老化,电流和温度进行补偿,集成了LED控制器,能驱动3-12个LED,并能自动荡计数,主要用在无线扬声器,医疗设备,无人机,电动工具,电动自行车,备用电池,玩具,家庭和建筑物自动化与传感器.本文介绍了MAX17263主要优势和特性,框图,多种应用电路以及评估板MAX17263 EVK主要特性和优势,电路图,材料清单和PCB设计图.

The MAX17263 is an ultra-low power fuel-gauge IC whichimplements the Maxim ModelGauge™ m5 algorithm. TheIC monitors either a single cell battery pack or multiple-seriescell battery pack with an external resistor divider. TheIC drives 3 to 12 automatically-counted LEDs to indicatebattery state-of-charge on a push-button press, or any othersystem status using I2C commands.

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 algorithm combines the short-term accuracy and linearityof a coulomb counter with the long-term stability ofa voltage-based fuel gauge, along with temperature compensationto provide industry-leading fuel-gauge accuracy.

The IC automatically compensates for cell-aging, temperature,and discharge rate, and provides accurate stateof-charge (SOC) in percentage (%) and remaining capacityin milliampere-hours (mAh) over a wide range of operatingconditions. As the battery approaches the critical regionnear empty, the algorithm invokes a special correction mechanism that eliminates any error. The IC providesaccurate estimation of time-to-empty and time-to-full andprovides three methods for reporting the age of the battery:reduction in capacity, increase in battery resistance,and cycle odometer.

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 a 3mmx 3mm 14-pin TDFN package.

MAX17263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
● Monitors Single-Cell or Multiple-Cell Battery Packs
● Integrated LED Control with Push-Button Input
• Drives 3 to 12 LEDs, Automatically Counted
● Custom Pattern LED Control Using I2C Commands
● Accurate Current Sensing
• High-Side or Low-Side Sensing Options
● Wide Sense Resistor Range: 1mΩ to 1000mΩ
● PCB Metal Sensing + Temperature Compensation
● Supports Li+ and Variants Including LiFePO4
● Thermistor or ±1℃ 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

MAX17263应用:

● Wireless Speakers
● Medical Devices
● Drones
● Power Tools
● E-Bikes
● Headlamps and Torches
● Battery Backup
● Toys
● Home and Building Automation, Sensors

图1.MAX17263框图

图2.MAX17263简化电量表电路图

图3.MAX17263 LED多路复用电路图

图4.MAX17263多电池低边电流测量典型应用电路图

图5.MAX17263单电池低边电流测量典型应用电路图

图6.MAX17263高边电流测量典型应用电路图

图7.MAX17263多个串联电池典型应用电路图

评估板MAX17263 EVK

The MAX17263G evaluation kit (EV kit) is a fully assem­bled and tested surface-mount PCB that evaluates the stand-alone ModelGauge™ m5 host-side fuel-gauge ICs for lithium-ion (Li+) batteries in handheld and portable equipment.

The MAX17263G EV kit includes 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 kit and can be downloaded from Maxim’s website at www.maximintegrated.com/products/MAX17263 (under the Design Resources tab). Windows 7 or newer Windows operating system is required to use with the EV kit GUI software.

评估板MAX17263 EVK主要特性和优势:

ModelGauge m5 Algorithm
Monitors Single-Cell or Multi-Cell Packs
On-Board LED Array
Thermistor Measurement Network
Optional On-Board PCB Trace Sense Resistor
Windows 7 or Newer Compatible Software
Proven PCB Layout
Fully Assembled and Tested

图8.评估板MAX17263 EVK电路图
评估板MAX17263 EVK材料清单:


图9.评估板MAX17263 EVK PCB设计图:顶层丝印

图10.评估板MAX17263 EVK PCB设计图:顶层布局

图11.评估板MAX17263 EVK PCB设计图:底层布局
详情请见:
https://datasheets.maximintegrated.com/en/ds/MAX17263.pdf
https://datasheets.maximintegrated.com/en/ds/MAX17263GEVKIT.pdf
MAX17263.pdf
MAX17263GEVKIT.pdf

 

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