Analog Devices Inc. AD7284电池监控系统
Analog Devices AD7284 8通道锂离子电池监控系统包括对堆叠式锂离子电池进行通用监控所需的全部功能。AD7284具有支持四到八个电池管理单元的多路复用单元电压和辅助模数转换器 (ADC) 测量通道。设计人员可以使用四个辅助ADC输入通道进行温度测量或系统诊断。AD7284提供八个差分模拟输入通道，可容纳整个VDD范围内的大共模信号。另外，AD7284还设有两个片内2.5V电压基准。一个电压基准用于主测量路径，另一个用于辅助测量路径。集成的辅助测量路径可验证14位主ADC上的数据。其他诊断特性包括检测开路输入、通信和电源相关故障。AD7284提供最大±3mV的单元电压精度、±16mV标准电池堆栈电压 (TUE) 精度，以及在96个单元上极低的测量延迟。AD7284电池监控系统符合汽车应用标准，非常适合用于锂离子电池监控、电动车辆和混合动力车辆以及固定电源应用。
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.
特性
- 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
应用
- 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
