</a>智能电池传感器" title="智能电池传感器">智能电池传感器" title="智能电池传感器">智能电池传感器(IBS),支持精密的电流,电压和温度测量,集成的LIN 2.1和LIN2.0接口进行通信,主要用在汽车电池电流/电压/温度监测,电池充电状态监测和电池完好状态监测以及混合动力汽车.本文介绍了MM912J637主要特性,方框图,模拟部分框图以及电流/电压/温度测量通路框图,简化应用电路和所需要外接元件表.

Intelligent Integrated Precision Battery Sensor

The MM912I637 (96 kB) and MM912J637 (128 kB) are fully integrated LIN Battery monitoring devices, based on Freescale S12 MCU Technology.

The device supports precise current measurement via an external shunt resistor, and precise battery voltage measurement via a series resistor directly at the battery plus pole. The integrated temperature sensor combined in the close proximity to the battery, allows battery temperature measurement.

The integrated LIN 2.1 interface makes the sensor feedback available on the LIN Bus.

MM912J637主要特性:

• Battery voltage measurement

• Battery current measurement in up to 8 ranges

• On chip temperature measurement

• Normal and two low-power modes

• Current threshold detection and current averaging in standby => wake-up from low-power mode

• Triggered wake-up from LIN and periodic wake-up

• Signal low pass filtering (current, voltage)

• PGA (programmable low-noise gain amplifier) with automatic gain control feature

• Accurate internal oscillator (an external quartz oscillator may be used for extended accuracy)

• Communication via a LIN 2.1, LIN2.0 bus interface

• S12 microcontroller with 128 kByte flash, 6.0 kByte RAM, 4.0 kByte data flash

• Background debug module

• External temperature sensor option (TSUP, VTEMP)

• Optional 2nd external voltage sense input (VOPT)

• 4 x 5.0 V GPIO including one Wake-up capable high voltage input (PTB3/L0)

• 8 x MCU general purpose I/O including SPI functionality

• Industry standard EMC compliance

MM912J637目标应用:

Automotive

Battery Current/Voltage/Temperature Monitoring

Battery State of Charge Monitoring

Battery State of Health Monitoring

Hybrid Electric Vehicles


图1.MM912J637方框图

图2.MM912J637 模拟部分方框图

图3.MM912J637电流测量通路框图

图4.MM912J637电压测量通路框图

图5.MM912J637温度测量通路框图

图6.MM912J637完整通路框图

图7.MM912J637 LIN模块框图

图8.MM912J637简化应用图

图9.MM912J637所需/推荐外接元件

所需/推荐外接元件数值表:




图10.典型的智能电池传感器(IBS)应用电路(器件GND = 底盘GND)

图11.典型的智能电池传感器(IBS)应用电路(器件GND =电池负端)
详情请见:
http://cache.freescale.com/files/analog/doc/data_sheet/MM912_637D1.pdf