原标题：Maxim MAX17843 12路高压智能传感器数据采集接口方案

　　Maxim公司的MAX17843是可编高度集成的高压12路智能传感器数据采集接口,具有广泛安全特性,最佳用在汽车系统的电池,混合电池组,电动汽车.高度集成电池传感器采用高速差分UART总线,用于鲁棒菊花链串行通信.模拟前端组合了12路带高压开关组输入的电压测量数据采集系统.所有的测量对每个电池单元进行.满刻度测量从0到5V,有用范围为0.2V到4.8V.高速的SAR ADC采用过取样来数字化电池电压,分辨率14位.所有12个电池在不到142μs测量完.测量电池包括锂电池, NiMH电池和超级电容电池.两个辅助模拟输入用于NTC热电偶或绝对电压测量,在+25℃和3.6V高精度差分测量I/Os ±2mV精度,可进行模块测量,12路内部电池平衡开关支持高达150mA/每开关,器件集成9V-65V输入线性稳压器,集成了温度补偿电压基准,器件直接和MCU连接,标准的UART比特@2Mb/s速率.内置诊断支持ASIL D和FMEA规范,待机模式电流消耗2.0mA,关断模式漏电3μA,工作温度-40℃ 到 +125℃(AEC-Q100 Grade 1).主要用在48V汽车电池模块或系统,高压电动汽车(EV),混合电动汽车(HEV),电池组,电动自行车,大功率电池备份系统,超级电容备份系统和电动工具.本文介绍了MAX17843主要特性和优势,功能框图,模拟前端(AFE输入)框图, 分布系统图以及评估板MAX17843 EVK主要特性和优势,电路图,材料清单和PCB设计图.

　　The MAX17843 is a programmable, highly integrated, high-voltage, 12-channel battery-monitoring smart data-acquisition interface with extensive features for safety. It is optimized for use with batteries used in automotive sys­tems, hybrid electric battery packs, electric cars, and any system that stacks long series strings of secondary metal batteries. This highly integrated battery sensor incorpo­rates a high-speed differential UART bus for robust daisy-chained serial communication.

　　The analog front-end combines a 12-channel voltage-measurement data-acquisition system with a high-voltage switch-bank input. All measurements are done differen­tially across each cell. The full-scale measurement range is from 0 to 5.0V with a usable range of 0.2V to 4.8V. A high-speed successive approximation (SAR) A/D con­verter is used to digitize the cell voltages at 14-bit resolu­tion with oversampling. All 12 cells can be measured in under 142μs. The MAX17843 uses a 2-scan approach for collecting cell measurements and correcting them for errors. This 2-phase approach yields excellent accuracy over temperature and in the face of extreme noise in the system.

　　The MAX17843 has two auxiliary analog inputs that can be used to measure external thermistor components. A negative temperature coefficient (NTC) thermistor can be configured with the AUXIN analog inputs to accurately monitor module or battery-cell temperature. A thermal-overload detector disables the MAX17843’s linear regula­tor to protect the IC, and a die-temperature measurement is also available.

　　MAX17843主要特性和优势:

　　12-Cell Battery-Voltage Measurement for Lithium-Ion, NiMH, or Super-Cap Cells

　　Two Auxiliary Analog Inputs for NTC Thermistor or Absolute Voltage Measurement

　　Die Temperature Measurement and alert

　　High-Accuracy Differential Measurement I/Os ±2mV Accuracy at +25°C and 3.6V

　　Integrated 12-Channel Data-Acquisition System Differential High-Voltage Mux to ADC

　　14-Bit ADC Resolution with Oversampling

　　12 Cell Voltages Measured within 142μs

　　Module Voltage Measurement

　　Redundant ADC

　　Battery Fault Detection Overvoltage and Undervoltage Digital Threshold Detection

　　Enhanced Diagnostic Features for Fault Detection to Support ASIL and FMEA

　　12 Internal Cell-Balancing Switches Support Up to 150mA per Switch

　　Emergency Cell-Discharge Mode

　　Integrated 9V to 65V Input Linear Regulator

　　Integrated Temperature-Compensated, Voltage Reference

　　Robust Differential Daisy-Chain UART Interface Up to 32 Connected ICs in a Single Daisy-Chain

　　Compatible with Direct MCU Connection

　　Standard UART bytes at 2Mb/s (max) Rate

　　Four General-Purpose Digital I/O Lines

　　Built-In Diagnostics to Support ASIL D and FMEA Requirements

　　Ultra-Low-Power Dissipation 2.0mA (typ) Standby-Mode Supply Current

　　3μA Shutdown Mode Leakage Current

　　-40℃ to +125℃ Operating Temperature Range (AEC-Q100 Grade 1)

　　64-Pin, Lead-Free/RoHS-Compliant, 10mm x 10mm LQFP Package

　　MAX17843应用:

　　48V Vehicle Battery Modules or Systems

　　High-Voltage Electric Vehicle (EVs)

　　Hybrid Electric Vehicles (HEVs)

　　Battery Packs

　　Electric Bikes

　　High-Power Battery-Backup Systems

　　Super-Cap Backup Systems

　　Power Tools

　　图1. MAX17843功能框图

　　图2. MAX17843 ESD二极管框图

　　图3. MAX17843模拟前端(AFE输入)框图

　　图4. MAX17843简化工作电路图

　　图5. MAX17843单元和开关输入滤波器工作电路图

　　图6. 电动汽车系统框图

　　图7. 菊花链系统图

　　图8.分布系统图

　　评估板MAX17843 EVK

　　The MAX17843 evaluation kit (EV kit) demonstrates the capabilities of the MAX17843 12-channel, high-voltage smart sensor data-acquisition interface IC. Vertical head­ers (P2, P3, P5, and P6) allow for the connection of mul­tiple EV kits, supporting up to a 32-device (max) daisy-chain configuration.

　　评估板MAX17843 EVK主要特性和优势:

　　Battery-Cell String Emulation

　　UART Interface

　　Windows XP®-, Windows Vista®-, Windows® 7-, and Windows 10-Compatible Software

　　Proven PCB Layout

　　Fully Assembled and Tested

　　图9. 评估板MAX17843 EVK电路图(1)

　　图10. 评估板MAX17843 EVK电路图(2)

　　图11. 评估板MAX17843 EVK电路图(3)

　　图12. 评估板MAX17843 EVK电路图(4)

　　评估板MAX17843 EVK材料清单: