ADI AD7280A1主要特性及15通道鋰電池管理模塊BMU基本功能

　　ADI 公司的15通道鋰電池管理模塊主要采用AD7280A，AD8280，ADuM5401，ADuM1201， ADuC7026和AD8601，實(shí)現(xiàn)了對(duì)15個(gè)鋰電池單體的電壓和溫度監(jiān)測(cè)，在保證信號(hào)監(jiān)測(cè)精度的同時(shí)，提供了主監(jiān)測(cè)電路和次級(jí)監(jiān)測(cè)電路的架構(gòu)，實(shí)現(xiàn)更高級(jí)別的系統(tǒng)保護(hù)。還提供了模塊化可擴(kuò)展的板級(jí)架構(gòu)，除主監(jiān)測(cè)電路模塊，次級(jí)監(jiān)測(cè)電路模塊，數(shù)據(jù)接口模塊外，可擴(kuò)展主動(dòng)均衡電路等其他模塊，方便系統(tǒng)原型開(kāi)發(fā)。本文介紹了AD7280A1主要特性，框圖和應(yīng)用電路，以及15通道鋰電池管理模塊BMU基本功能，框圖，電路圖，材料清單和PCB元件布局圖和設(shè)計(jì)圖。

　　The AD7280A1 contains all the functions required for general- purpose monitoring of stacked lithium ion batteries as used in hybrid electric vehicles， battery backup applications， and power tools. The part has multiplexed cell voltage and auxiliary ADC measurement channels for up to six cells of battery management. An internal ±3 ppm/°C reference is provided that allows a cell voltage accuracy of ±1.6 mV. The ADC resolution is 12 bits and allows conversion of up to 48 cells within 7 μs. The AD7280A operates from a single VDD supply that has a range of 8 V to 30 V （with an absolute maximum rating of 33 V）。 The part provides six differential analog input channels to accommodate large common-mode signals across the full VDD range. Each channel allows an input signal range， VIN（+） ? VIN（?）， of 1 V to 5 V. The input pins assume a series stack of six cells. In addition， the part includes six auxiliary ADC input channels that can be used for temperature measurement or system diagnostics.

　　The AD7280A includes on-chip registers that allow a sequence of channel measurements to be programmed to suit the application requirements. The AD7280A also includes a dynamic alert function that can detect whether the cell voltages or auxiliary ADC inputs exceed an upper or lower limit defined by the user. The AD7280A has cell balancing interface outputs designed to control external FET transistors to allow discharging of individual cells. The AD7280A includes a built-in self-test feature that internally applies a known voltage to the ADC inputs. A daisy-chain interface allows up to eight parts to be stacked without the need for individual device isolation. The AD7280A requires only one supply pin that accepts 6.9 mA under normal operation while converting at 1 MSPS. All this functionality is provided in a 48-lead LQFP package operating over a temperature range of ?40°C to +105°C.

　　AD7280A1主要特性：

　　12-bit ADC， 1 μs per channel conversion time

　　6 analog input channels， common-mode range 0.5 V to 27.5 V

　　6 auxiliary ADC inputs

　　±1.6 mV cell voltage accuracy

　　On-chip voltage regulator

　　Cell balancing interface

　　Daisy-chain interface

　　Internal reference： ±3 ppm/oC

　　1.8 μA power-down current

　　High input impedance

　　Serial interface with alert function

　　1 SPI interface for up to 48 channels

　　CRC protection on read and write commands

　　On-chip registers for channel sequencing

　　VDD operating range： 8 V to 30 V

　　Temperature range： ?40℃ to +105℃

　　48-lead LQFP Qualified for automotive applications

　　AD7280A1應(yīng)用：

　　Lithium ion battery monitoring

　　Electric and hybrid electric vehicles

　　Power supply backup

　　Power tools

圖1.AD7280A1功能框圖

圖2.AD7280A1六電池配置圖
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　　圖3.AD7280A1菊花鏈配置圖

　　15通道鋰電池管理模塊BMU

　　The 15ch BMU demo board is a tool for user to evaluate ADI Li-ion BMS chipset， including primary cellmonitoring IC AD7280A， backup cell monitoring IC AD8280， digital isolator ADuM1201， power isolatorADuM5401/03，and MCU ADuC7026. User can connect the board to Li-ion cells， connect with CAN tooltool set orPC directly， to enable in-system evaluation. This document describes basic operation of the 15ch BMU DEMO.

　　15通道鋰電池管理模塊BMU基本功能：

　　- Primary cell monitoring

　　o Up to 15 cell voltage inputs

　　o Up to 18temperature inputs

　　o 12-bit resolution of conversion data

　　o Alert of Over-Voltage， Under-Voltage， Over-Temperature， and Under-Temperature

　　o Self-Test

　　o Configurable acquisition time， conversion channels， averaging.

　　- Backup cell monitoring

　　o Up to 15 cell voltage inputs

　　o Up to 6 temperature inputs

　　o Alert outputs of Over-Voltage， Under-Voltage， and Over-Temperature