原标题：Maxim MAX17823B 12路高压数据采集系统解决方案

　　Maxim公司的MAX17823B 12路高压数据采集系统,具有12位SAR ADC,能在161 μs内测量12颗电池电压和两个温度值.器件内部有12个开关用来电池平衡和广泛的内置诊断.多达32个器件可菊花链接在一起,管理384个电池和监测64个温度.器件满足AECQ-100 Grade 2温度范围-40℃ 到 105℃,工作电压从9V到65V,超低功耗:待机模式为2mA,关断模式为2μA.电池电压(0V到5V)能在65V共模范围分别测量.如果采用过取样,每路可多达128个测量,分辨率为14位.内置诊断以支持ASIL D和FMEA要求,电池管理UART协议.主要用在高压电池组,电动汽车(EV),混合电动汽车(HEV),电动自行车,电池备份系统(UPS),超级电容系统,电池供电的工具.中电网为您整理如下详细资料,本文介绍了MAX17823B主要优势和特性,功能框图和二极管图,模拟前端框图,电动汽车系统框图和工作电路图,以及评估板MAX17823B EVK主要优势和特性,电路图,材料清单和PCB设计图

　　The MAX17823B is a data acquisition system for the management of high-voltage battery modules. The system features a 12-bit SAR ADC that can measure 12 cell voltages and two temperatures in 161 μs. There are 12 internal switches for cell-balancing and extensive built-in diagnostics. Up to 32 devices can be daisy-chained together to manage 384 cells and monitor 64 temperatures.

　　Cell voltages (0V to 5V) are measured differentially over a 65V common-mode range. Cell measurements have a typical accuracy of 2mV (3.6V cell, 25℃). If oversampling is enabled, up to 128 measurements per channel can be averaged internally with 14-bit resolution. The system can shut itself down in the event of a thermal overload by measuring its own die temperature.

　　The system uses Maxim’s battery-management UART protocol for robust communications and when used in conjunction with the MAX17880 12-channel battery monitor, it is ideal for automotive battery-management systems that require a high safety integrity level.

　　MAX17823B主要优势和特性:

　　• AECQ-100 Grade 2 Temperature Range

　　- -40℃ to 105℃

　　• Operating Voltage from 9V to 65V

　　• Ultra-Low Power Operation

　　- Standby Mode: 2mA

　　- Shutdown Mode: 2μA

　　• 12 Cell-Voltage Measurement Channels

　　- 2mV Accuracy (3.6V, +25℃)

　　- 5mV Accuracy (0℃ to +45℃)

　　- 10mV Accuracy (-40℃ to +105℃)

　　• 12 Cell-Balancing Switches

　　- Up to 150mA per switch

　　- Emergency Discharge Mode

　　• Two Temperature Measurement Channels

　　• Die Temperature Measurement

　　• Automatic Thermal Protection

　　• 29 Voltage Threshold Alerts

　　- 12 Over-Voltage Faults

　　- 12 Under-Voltage Faults

　　- Two Over-Temperature Faults

　　- Two Under-Temperature Faults

　　- One Cell Mismatch Alert (highest cell versus lowest cell)

　　• Four GPIOs

　　• Built-in Diagnostics to Support ASIL D and FMEA Requirements

　　• Battery-Management UART Protocol

　　− Daisy-Chain up to 32 Devices

　　− Communication Port Isolation

　　− Up to 2Mbps Baud Rate (auto-detect)

　　− 1.5μs Propagation Delay per Device

　　− Packet-Error Checking (PEC)

　　• Factory-Trimmed Oscillators

　　− No External Crystals Required

　　• 10mm x 10mm Package (64-pin LQFP)

　　MAX17823B应用:

　　• High-Voltage Battery Stacks

　　• Electric Vehicles (EVs)

　　• Hybrid Electric Vehicles (HEVs)

　　• Electric Bikes

　　• Battery-Backup Systems (UPS)

　　• Super-Cap Systems

　　• Battery-Powered Tools

　　图1.MAX17823B功能框图

　　图2.MAX17823B ESD二极管图

　　图3.MAX17823B模拟前端框图

　　图4.电动汽车系统框图

　　图5.MAX17823B简化工作电路图

　　图6.菊花链系统图

　　图7.分布系统图

　　评估板MAX17823B EVK

　　The MAX17823 evaluation kit (EV kit) demonstrates the capabilities of the MAX17823B advanced smart battery-pack controller. Vertical headers (P2, P3, P5, and P6) allow for the connection of multiple EV kits to support the maximum 32-device daisy-chain capability.

　　评估板MAX17823B EVK主要优势和特性:

　　Battery-Cell String Emulation

　　UART interface

　　Windows XP®-, Windows Vista®-, or Windows® 7-Compatible Software

　　Fully Assembled and Tested

　　图8.评估板MAX17823B EVK电路图(1)

　　图9.评估板MAX17823B EVK电路图(2)

　　图10.评估板MAX17823B EVK电路图(3)

　　图11.评估板MAX17823B EVK电路图(4)