|
Freescale公司的MM912J637是基于S12 MCU技術的汽車智能電池傳感器(IBS),支持精密的電流,電壓和溫度測量,集成的LIN 2.1和LIN2.0接口進行通信,主要用在汽車電池電流/電壓/溫度監測,電池充電狀態監測和電池完好狀態監測以及混合動力汽車.本文介紹了MM912J637主要特性,方框圖,模擬部分框圖以及電流/電壓/溫度測量通路框圖,簡化應用電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目標應用: Automotive Battery Current/Voltage/Temperature Monitoring Battery State of Charge Monitoring Battery State of Health Monitoring Hybrid Electric Vehicles 
圖1.MM912J637方框圖
圖2.MM912J637 模擬部分方框圖
圖3.MM912J637電流測量通路框圖
圖4.MM912J637電壓測量通路框圖
圖5.MM912J637溫度測量通路框圖
圖6.MM912J637完整通路框圖
圖7.MM912J637 LIN模塊框圖
圖8.MM912J637簡化應用圖
圖9.MM912J637所需/推薦外接元件 所需/推薦外接元件數值表:
圖10.典型的智能電池傳感器(IBS)應用電路(器件GND = 底盤GND)
圖11.典型的智能電池傳感器(IBS)應用電路(器件GND =電池負端) 詳情請見: 
MM912_637D1[1].pdf
(11.3 MB)
|
