Analog Devices Inc. AD7284バッテリモニタリングシステム
Analog Devices AD7284 8チャンネル・リチウムイオン電池モニタリングシステムは、スタック・リチウムイオン・バッテリの汎用モニタリングに必要なあらゆる機能を内蔵しています。AD7284は、多重セル電圧および補助ADC計測チャンネルが特徴で、4～8バッテリ管理セルをサポートしています。設計者は、4つの温度測定またはシステム診断用の補助ADC入力チャンネルを使用できます。8個の差動アナログ入力チャンネルが備わったAD7284は、VDD範囲全体で大コモンモード信号に対処できます。また、AD7284の設計には、2つのオンチップ2.5Vの電圧リファレンスがあります。1つの電圧リファレンスはプライマリ測定パス用、もう1つはセカンダリ測定パス用です。この内蔵セカンダリ測定パスは、プライマリ14ビットADCのデータを検証します。その他の診断機能には、オープン入力、通信、電源関連障害の検出があります。AD7284には、±3mVの最大セル電圧精度、±16mV（typ）のバッテリスタック電圧（TUE）精度、96セル全体で非常に低い測定レイテンシが備わっています。AD7284バッテリモニタリングシステムは、リチウムイオン・バッテリ・モニタリング、電気自動車およびハイブリッド電気自動車、静止電源アプリケーションに最適です。
Analog Devices AD7284's design also includes two on-chip 2.5V voltage references. One voltage reference works with the primary measurement path, and the other is designated for the secondary measurement path. The integrated secondary measurement path validates the data on the primary 14-bit ADC. Other diagnostic features include the detection of open inputs, communication, and power-supply related faults.
The AD7284 offers a ±3mV maximum cell voltage accuracy, ±16mV typical battery stack voltage (TUE) accuracy, and very low measurement latency across 96 cells. The AD7284 Battery Monitoring System is ideal for li-ion battery monitoring, electric and hybrid electric vehicles, and stationary power applications.
特徴
- 8 Analog Input Channels, Integrated Secondary Monitor
- ±3mV maximum cell voltage accuracy, TUE, 14-bit ADC
- Very low measurement latency across 96 cells
- Stack Voltage Measurement
- ±16mV typical battery stack voltage (TUE) accuracy
- Cell balancing interface, with individually programmable on time
- 4 Auxiliary Analog Input Channels, 14-bit ADC
- Suitable for thermistor inputs and external diagnostics
- Buffered reference output for ratiometric measurements
- Internal temperature sensor
- 10V to 40V operating range
- On-chip 5V regulator
- Watchdog timer
- 100μA IDD matching current
- Robust, proprietary daisy-chain interface
- SPI to host controller
- CRC protection on read and write commands
- 2 general-purpose outputs
- 64-lead low profile quad flat package, exposed pad (LQFP_EP)
- −30°C to +120°C junction temperature range
- Qualified for automotive applications
アプリケーション
- Li-Ion battery monitoring
- Electric and hybrid electric vehicles
- Stationary power applications
Technical Article
A state-of-the-art battery monitoring system (BMS) not only allows the user to extract the highest quantity of charge from the battery pack but also lets them manage the charge and discharge cycles in a safer way, which results in an extended life. Analog Devices provides a full portfolio of BMS devices focusing on accuracy and robust operation.
EVAL-AD7284 Evaluation System
Analog Devices EVAL-AD7284 evaluation system includes separate master and slave evaluation kits for the AD7284 8-Channel, Li-Ion Battery Monitoring System. The kits provide designers with a direct current daisy chain or isolated daisy-chain options.
Block Diagram
