BQ76925
- Analog interface for host cell measurement
- Cell input MUX, level shifter, and scaler
- 1.5-/ 3.0-V low-drift, calibrated reference allows accurate analog-to-digital conversions
- Analog interface for host current measurement
- Variable gain current sense amplifier capable of operation with 1-mΩ sense resistor
- Switchable thermistor bias output for host temperature measurements
- Overcurrent comparator with dynamically adjustable
threshold
- Alerts host to potential overcurrent faults
- Wakes up host on load connect
- Integrated cell balancing FETs
- Individual host control
- 50 mA per cell balancing current
- Supports cell sense-line open wire detection
- Integrated 3.3-V regulator for powering micro-controller or LEDs
- I2C interface for host
communications
- Optional packet CRC for robust operation
- Supply voltage range from 4.2 V to 26.4 V
- Low power consumption
- 40 µA typical in NORMAL mode
- 1.5 µA maximum in SLEEP mode
- 20-pin TSSOP or 24-pin VQFN package
The BQ76925 host-controlled analog front end (AFE) is part of a complete pack monitoring, balancing, and protection system for 3-, 4-, 5-, or 6-series cell li-ion and li-polymer batteries. The BQ76925 device allows a host controller to monitor individual cell voltages, pack current and temperature easily. The Host may use this information to determine unsafe or faulty operating conditions such as overvoltage, undervoltage, overtemperature, overcurrent, cell imbalance, state of charge, and state of health conditions.
Cell input voltages are level-shifted, multiplexed, scaled, and output for measurement by a host ADC. A dedicated pin provides a low-drift calibrated reference voltage to enable accurate measurements.
The voltage across an external-sense resistor is amplified and output to a host ADC for both charge and discharge current measurements. Two gain settings enable operation with a variety of sense resistor values over a wide range of pack currents.
To enable temperature measurements by the host, the AFE provides a separate output pin for biasing an external thermistor network. This output can be switched on and off under host control to minimize power consumption.
The BQ76925 device includes a comparator with a dynamically selectable threshold for monitoring current. The comparator result is driven through an open-drain output to alert the host when the threshold is exceeded. This feature can be used to wake up the host on connection of the load, or to alert the host to a potential fault condition.
The BQ76925 device integrates cell balancing FETs that are fully controlled by the host. The balancing current is set by external resistors up to a maximum value of 50 mA. These same FETs may be utilized in conjunction with cell voltage measurements to detect an open wire on a cell sense-line.
The host communicates with the AFE through an I2C interface. A packet CRC may optionally be used to ensure robust operation. The device may be put into a low-current sleep mode through the I2C interface and awakened by pulling up the ALERT pin.
技术文档
| 顶层文档 | 类型 | 标题 | 格式选项 | 下载最新的英语版本 | 日期 | |
|---|---|---|---|---|---|---|
| * | 数据表 | BQ76925 3-Series to 6-Series Cell Li-Ion and Li-Phosphate Battery Monitor (Analog Front End) 数据表 (Rev. E) | PDF | HTML | 2020-4-21 | ||
| 应用手册 | Getting Started With the bq76925 (Rev. B) | 2019-12-9 | ||||
| 应用手册 | 3~6 Cells Battery Management System Based On BQ76925+MSP430G2xx2 | 2014-3-20 |
设计与开发
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BQ76925EVM — 用于 3 至 6 节锂离子电池的 BQ76925 模拟前端评估模块
BQ76925EVM 是用于评估 BQ76925（适用于 3 至 6 节串联锂离子电池的模拟前端）的评估模块。BQ76925EVM 评估模块的用户指南可帮助设计人员完成 BQ76925 评估。该指南讨论了相应模块的设置和运行，且包含原理图、物料清单和印刷电路板布局布线图。在使用 BQ76925 设计电池管理系统之前，建议设计人员先阅读 BQ76925 数据表。如果设计人员想通过基于 Windows 的 PC 与此 EVM 进行通信，建议使用单独的 USB 接口适配器 EVM。USB-TO-GPIO 适配器可用作接口适配器或主机 PC（兼容 IBM）与一个或多个从属器件（通过标准 Type-A (...)
| 封装 | 引脚 | CAD 符号、封装和 3D 模型 |
|---|---|---|
| TSSOP (PW) | 20 | Ultra Librarian |
| VQFN (RGE) | 24 | Ultra Librarian |
订购和质量
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