韌體
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.
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檢視所有 4 | 類型 | 標題 | 日期 | ||
|---|---|---|---|---|
| * | Data sheet | BQ76925 3-Series to 6-Series Cell Li-Ion and Li-Phosphate Battery Monitor (Analog Front End) datasheet (Rev. E) | PDF | HTML | 2020年 4月 21日 |
| Application note | Getting Started With the bq76925 (Rev. B) | 2019年 12月 9日 | ||
| User guide | bq76925EVM Evaluation Module (Rev. A) | 2019年 2月 11日 | ||
| Application note | 3~6 Cells Battery Management System Based On BQ76925+MSP430G2xx2 | 2014年 3月 20日 |
設計與開發
如需其他條款或必要資源，請按一下下方的任何標題以檢視詳細頁面 (如有)。
開發板
BQ76925EVM — 用於 3 至 6 串聯鋰離子電池的 BQ76925 類比前端評估模組
The BQ76925EVM is an evaluation module for BQ76925, analog front end for 3 to 6 Series Lithium-Ion Cells. The user's guide for the BQ76925EVM evaluation module can assist designers in their evaluation of the BQ76925. This guide discusses setup and operation of the module and contains schematics, (...)
使用指南: PDF
支援軟體
SLUC268 — bq76925 Evaluation Software
支援產品和硬體
產品
電池監控器和平衡器
硬體開發
開發板
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| TSSOP (PW) | 20 | Ultra Librarian |
| VQFN (RGE) | 24 | Ultra Librarian |
訂購與品質
內含資訊：
- RoHS
- REACH
- 產品標記
- 鉛塗層/球物料
- MSL 等級/回焊峰值
- MTBF/FIT 估算值
- 材料內容
- 認證摘要
- 進行中持續性的可靠性監測
內含資訊：
- 晶圓廠位置
- 組裝地點
建議產品可能具有與此 TI 產品相關的參數、評估模組或參考設計。