原标题：Maxim MAX17301单电池ModelGauge m5电量测量解决方案

　　SiC MOSFET 栅极驱动器Maxim公司的MAX1730x/MAX1731x系列产品是具有保护器和SHA-256认证的24μA IQ单独可用的电池组电池电量计IC,可以实现Maxim公司的ModelGauge m5算法而不需要主机交互的配置,可用于单颗锂电池/聚合物电池.这就使得MAX1730x/MAX1731x具有极好的电池组电量计性能.它们能监测电压,电流,温度和电池状态,以保证锂电池/聚合物电池工作在安全状态下,从而延长电池寿命.器件采用外接高边N-FET提供过压/欠压,过流,短路,超温/低温与过充保护以及充电描述.MAX1730x/MAX1731x系列提供可编程放电保护,用于过充电电流(快速,中速和慢速保护),超温和欠压灯.此外,器件还能自动补偿老化,温度和放电速率,以毫安时(mAh)或宽范围工作条件下的百分比来提供的精确充电状态(SOC).主要用在智能手机,平板电脑和二合一电脑,智能手表和可穿戴,医用设备,健康和健康状况监视器,数码相机,视频和动作摄像机,手持计算机和终端,手持无线电,家庭和建筑物自动化,传感器和智能电池.本文介绍了MAX1730x/MAX1731x系列产品主要特性和优势,框图和多种应用框图,以及评估板MAX173xxX和MAX173xxG EVK主要特性和优势,电路图,材料清单和PCB设计图.

　　The MAX1730x/MAX1731x is a family of 24μA IQ stand-alone pack-side fuel gauge ICs with protector and SHA-256 authentication for 1-cell lithium-ion/polymer batteries which implements Maxim’s ModelGauge m5 algorithm without requiring host interaction for configuration.

　　This makes the MAX1730x/MAX1731x an excellent pack-side fuel gauge.The MAX1730x/MAX1731x monitors the voltage, current, temperature, and state of the battery to ensure that the lithium-ion/polymer battery is operating under safe conditions to prolong the life of the battery.

　　Voltage of the battery pack is measured at the BATT connection. Current is measured with an external sense resistor placed between the CSP and CSN pins. Power and average power are also reported. An external NTC thermistor connection allows the IC to measure temperature of the battery pack by monitoring the TH pin. The TH pin provides an internal pull-up for the thermistor that is disabled internally when temperature is not being measured. Internal die temperature of the IC is also measured and can be a proxy for the protection FET temperature if they are located close by the IC. The MAX1730x/MAX1731x provides programmable discharge protection for overdischarge currents (fast, medium, and slow protection), overtemperature, and undervoltage.

　　The IC also provides programmable charge protection for overvoltage, over/undertemperature, overcharge currents (fast and slow), charge done, charger communication timeout, and overcharge capacity fault.

　　The IC provides ideal diode discharge behavior even while a charge fault persists. The IC provides programmable charging current/voltage prescription following JEITA temperature regions as well as step-charging. The MAX17301/MAX17311 provides additional protection to permanently disable the battery by overriding a secondary protector or blowing a fuse in severe fault conditions.

　　This is useful when the IC has detected FET failure and is unable to block charge/discharge any other way.

　　Additional functionality is described in the Protector section. The IC supports three low-power modes: undervoltage shutdown (0.1μA), deepship (0.5μA), and ship (7μA). The IC can enter these low-power modes by command, communication collapsed (if enabled), or undervoltage shutdown.

　　The IC can wake up from these low-power modes by communication, charger detection, or pushbutton wakeup (if enabled and installed). Pushbutton wakeup allows a pack to completely disconnect from a system during shipping, yet wakeup immediately upon the user pressing the button, not needing the user to plug in a charger. The ModelGauge m5 algorithm combines the short-term accuracy and linearity of a coulomb counter with the long-term stability of a voltage-based fuel gauge, along with temperature compensation to provide industry-leading fuel-gauge accuracy.

　　Additionally, the algorithm does not suffer from abrupt corrections that normally occur in coulomb-counter algorithms, since tiny continual corrections are distributed over time.

　　The MAX1730x/MAX1731x automatically compensates for aging, temperature, and discharge rate and provides accurate state of charge (SOC) in milliampere-hours (mAh) or percentage (%) over a wide range of operating conditions.

　　Fuel gauge error always converges to 0% as the cell approaches empty. Dynamic power functionality provides the instantaneous maximum battery output power which can be delivered to the system without violating the minimum system input voltage.

　　The IC provides accurate estimation of time-to-empty and time-to-full and provides three methods for reporting the age of the battery: reduction in capacity, increase in battery resistance, and cycle odometer. In addition, age forecasting allows the user to estimate the expected lifespan of the cell. To prevent battery clones, the IC integrates SHA-256 authentication with a 160-bit secret key (MAX17301/02/11/12 only). Every IC also incorporates a 64-bit unique identification number (ROM ID). Additionally, up to 122 bytes of user memory (NVM) can be made available to store custom information. Communication to the host occurs over a Maxim 1-Wire (MAX17311-MAX17313) or standard I2C interface (MAX17301-MAX17303). OD/SCL is an input from the host, and DQ/SDA is an open-drain I/O pin that requires an external pullup. The ALRT1 pin is an output that can be used as an external interrupt to the host processor if certain application conditions are detected.

　　The MAX17301–MAX17303/MAX17311–MAX17313 is a 24μA IQ stand-alone pack-side fuel gauge IC with protec­tor and optional SHA-256 authentication for 1-cell lithium-ion/polymer batteries.

　　The IC monitors the voltage, current, temperature, and state of the battery to provide against over/undervoltage, overcurrent, short-circuit, over/undertemperature and overcharge conditions protection using external high-side N-FETs, and provides charging prescription to ensure that the lithium-ion/polymer battery operates under safe condi­tions prolonging the life of the battery.

　　To prevent battery pack cloning, the IC integrates SHA-256 authentication with a 160-bit secret key. Each IC incorporates a unique 64-bit ID.

　　The fuel gauge uses ModelGauge m5 algorithm that com­bines the short-term accuracy and linearity of a coulomb counter with the long-term stability of a voltage-based fuel gauge to provide industry-leading fuel-gauge accuracy.

　　The IC automatically compensates for cell aging, temper­ature, and discharge rate, and provides accurate state-of-charge (SOC) in milliampere-hours (mAh) or percentage (%) over a wide range of operating conditions.

　　Dynamic power functionality provides the instantaneous maximum battery output power which can be delivered to the system without violating the minimum system input voltage.

　　A Maxim 1-Wire® or 2-wire I2C interface provides access to data and control registers. The IC is available in a lead-free, 3mm x 3mm 14-pin TDFN and 1.7mm x 2.5mm 15-bump 0.5mm pitch WLP packages.

　　MAX17301主要特性和优势:

　　● Battery Health + Programmable Safety/Protection

　　• Overvoltage (Temperature Dependent)

　　• Overcharge Current

　　• Over/Undertemperature

　　• Ideal Diode Discharge During Charge Fault

　　• Charging Prescriptions (JEITA)

　　• Zero-Volt Charging Option

　　• Undervoltage + SmartEmpty

　　• Overdischarge/Short-Circuit

　　● Nonvolatile Memory for Stand-Alone Operation

　　• History Logging, User Data (122 Bytes)

　　● Low Quiescent Current

　　• FETs Enabled: 24μA Active, 18μA Hibernate

　　• FETs Disabled: 7μA Ship, 0.5μA DeepShip, 0.1μA UV-Shutdown

　　● Pushbutton Wakeup—Eliminates System Consumption Until Button Press

　　● ModelGauge m5 EZ Algorithm

　　• Percent, Capacity,Time-to-Empty/Full, Age

　　• Cycle+™ Age Forecast

　　● Dynamic Power—Estimates Power Capability

　　● Precision Measurement Without Calibration

　　• Current, Voltage, Power, Time, Cycles

　　• Die Temperature/Thermistor

　　MAX17301应用:

　　● Smartphones, Tablets, and 2-in-1 Laptops

　　● Smartwatches and Wearables

　　● Medical Devices, Health and Fitness Monitors

　　● Digital Still, Video, and Action Cameras

　　● Handheld Computers and Terminals

　　● Handheld Radios

　　● Home and Building Automation, Sensors

　　● Smart Batteries

图1.MAX17301功能框图

图2.MAX17301带保护电路的电量表框图

图3.MAX17301带二次保护器的典型应用框图

图4.MAX17301带电量的应用框图

图5.ModelGauge m5框图

　　评估板MAX173xxX/MAX173xxG EVK

　　The MAX173xxX/MAX173xxG evaluation kits (EV kits) are fully assembled and tested surface-mount PCBs that evaluate the stand-alone pack-side fuel gauge IC with protector and SHA-256 authentication for 1-cell lithium-ion/polymer batteries.

　　The EV kits include the IC evaluation board with inte­grated I2C/1-Wire® interface and USB micro-B 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/products/MAX17303(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MAX173xxX/MAX173xxG EVK主要特性和优势:

　　ModelGauge™ m5 Algorithm

　　Monitors Single-Cell Packs

　　Full Protection Solution On-Board for Evaluation

　　Battery Pack Input Voltage Range of +2.3V to +4.9V with Default Hardware

　　Default Current Range -5A to +5A, up to 10A with less than 5mΩ Sense Resistor

　　Thermistor Measurement NetworkA

　　On-Board I2C/1-Wire Communication Interface

　　Windows 7 or Newer Compatible Software

　　Proven PCB Layout

　　Fully Assembled and Tested

图6.评估板MAX17313XEVKIT外形图

图7.评估板MAX1731xxEVKIT连接图

图8.评估板MAX173xxG EVKIT电路图

　　评估板MAX173xxG EVKIT材料清单:

图.评估板MAX173xxX EVKIT电路图

　　评估板MAX173xxX EVKIT材料清单: