MaximMAX1106812路智能数据收罗方案

Maxim 公司的MAX11068 是可编程高度集成高压12路电池监督智能数据收罗接口电路，它的模拟前端包罗12路电压丈量数据收罗系统和高压开关组输入，丈量范围0-5V，满规格包管精度从0.5V 到 4.7V，丈量精度±0.25%，失调电压≤ 5mV。MAX11068集成了6V-70V输入的线性稳压器，以及25ppm/NC, 2.5V细密基准电压源。主要用在汽车系统，混淆电力汽车电池组，电动汽车，大功率电池备分系统以及SuperCap备分系统和动力工具。本文先容了MAX11068主要特点，功能方框架图，模拟前端（AFE）方框架图，多种应用电路以及MAX11068 评估套件主要特点，详细电路图和质料清单（BOM）。

The MAX11068 is a programmable, highly integrated, high-voltage, 12-channel, battery-monitoring smart data-acquisition interface. 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 simple state machine and a high-speed I2C bus for SMBusK-laddered serial communication.

The MAX11068 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 full stated accuracy guaran­teed from 0.5V to 4.7V. The input mux/switch bank allows for differential measurement of each cell in a series stack. A high-speed, 12-bit successive approximation (SAR) A/D converter is used to digitize the cell voltages. All 12 cells can be measured in less than 107Fs. The MAX11068 uses a two-scan approach for collecting cell measurements and correcting them for errors. The first phase of the scan is the acquisition phase where the voltages of all 12 cells are acquired. The second phase is the error-cancellation phase where the ADC input is chopped to remove errors. This two-phase approach yields excellent accuracy over temperature and in the face of extreme noise in the sys­tem. The MAX11068 incorporates an internal oscillator that generates a 6.0MHz system clock with Q3.0% accuracy.

The MAX11068 consumes less than 2.0mA from the power supply while in data-acquisition modes. This current is reduced to 75FA in standby mode and less than 1FA in shutdown mode. The device is packaged in a 38-pin, 9.7mm x 4.4mm x 1.0mm TSSOP package that is lead free and RoHS compliant and is designed to operate over the AEC-Q100 Grade 2, -40NC to +105NC temperature range.

MAX11068主要特点：

12-Cell Battery Voltage Measurement with Temperature Monitoring Up to 12 Lithium-Ion (Li+), NiMH, or Super-Cap Cells Two Auxiliary Analog Inputs for Temperature Measurement

High-Accuracy I/Os Excellent ±0.25% Voltage-Measurement Accuracy ≤ 5mV Offset Voltage

Integrated 12-Channel Data-Acquisition System 12-Channel High-Voltage Mux to ADC Differential Cell-Voltage Measurement 12-Bit Precision, High-Speed SAR ADC 12 Cell Voltages Measured Within 107μs

Battery-Fault Detection Overvoltage and Undervoltage Digital Threshold Detection Cell Sense Line Open-Circuit Detection High/Low Temperature Digital Threshold Detection

12 Integrated Cell-Equalization Switches Support Up to 200mA

Integrated 6V to 70V Input Linear Regulator

Integrated 25ppm/NC, 2.5V Precision Reference

Integrated Level-Shifted, I2C-Compliant SMBus Ladder Interface Supports Multiple Devices, Up to 31 SMBus- Ladder-Connected ICs Communications Protocol with Autoaddressing Fault-Tolerant Hardware Handshake and Data CRC Checking

Three General-Purpose Digital I/O Lines

Ultra-Low Power Dissipation Standby Mode Quiescent Current Drain 75μA Shutdown Mode Leakage Current 1μA

Operating Temperature Range from -40NC to +105NC (AEC-Q100 Grade 2)

38-Pin, Lead-Free/RoHS-Compliant TSSOP Package (9.7mm x 4.4mm)

MAX11068应用：

High-Voltage, Multicell Series-Stacked-Battery Systems

Electric and Hybrid Electric Vehicle (HEV) Battery Packs

Electric Bikes

High-Power Battery Backup Systems

SuperCap Backup Systems

Power Tools

图1。MAX11068功能方框架图

图2。MAX11068模拟前端（AFE）方框架图

图3。MAX11068 12单位系统工作电路框架图

图4。MAX11068带冗余故障检测的电池模块系统应用电路图

图5。MAX11068分布式通信电池盒

图6。MAX11068 SMBus梯状电池模块通信

MAX11068 评估套件(EV kit)

The MAX11068 evaluation kit (EV kit) demonstrates the capabilities of the MAX11068 advanced smart battery-pack controller. The EV kit PCB is made up of two boards, each containing nearly identical MAX11068 circuits. The left side of the EV kit is referenced as side (A) and the right side is referenced as side (B). The two-boards-in-one design provides a simple demonstration of the MAX11068’s SMBus™ ladder capability. Additional vertical headers allow for the connection of multiple EV kits, supporting the maximum 31-device ladder capability of the device’s I²C bus system.

Integrated into the EV kit design are two MAX11080 12-channel high-voltage battery-pack fault monitors. The MAX11080 ICs work in conjunction with the MAX11068 ICs, providing redundant overvoltage and undervoltage monitoring.

MAX11068 评估套件主要特点：

On-Board Protection Fuse (Optional)

Battery-Cell String Emulation

I2C interface (MINIQUSB Connectivity)

Windows® 2000-, Windows XP®-, and Windows Vista® (32-Bit)-Compatible Software

Fully Assembled and Tested

图7。MAX11068 评估套件电路图（A面）：MAX11068 IC 电路(U1)

图8。MAX11068 评估套件电路图（A面）：单位配置，ALRMLA 和LRMOUTCA 电路, GPIO 测试点和插座J1 与J2

图9。MAX11068 评估套件电路图（A面）：MAX11080 IC 电路(U2)

图10。MAX11068 评估套件电路图（B面）：MAX11068 IC 电路(U101)

图11。MAX11068 评估套件电路图（B面）：单位配置，ALRMLA 和LRMOUTCA 电路, GPIO 测试点和插座J101 与J102

图11。MAX11068 评估套件电路图（B面）：MAX11080 IC电路（U102）

图11。MAX11068 评估套件电路图（接口插座）：20引脚单列插座(J4CJ7 和J104CJ107), 毗连器P2和接口插座(J3 和J103)

图12。MAX11068 评估套件电路图（单位毗连开关和插座）：7位置开关(SW21, SW22, SW121,和SW122)以及插座 (J8和J108)
MAX11068 评估套件质料清单（BOM）：



详情请复制打开此衔接地址：
http://datasheets.maxim-ic.com/en/ds/MAX11068.pdf
和
http://datasheets.maxim-ic.com/en/ds/MAX11068EVMINIQU.pdf