BQ79881-Q1
- Two fast pack voltage measurements
- Dedicated single-ended measurements; ASIL-D
- HV Measurement Accuracy <0.4% ; 0.3-5v single ended
- 0uS VI sync within BQ79881; fast 5uS typical VI Sync with cell measurements
- Accurate Single-Ended Measurements
- Up to 18 single ended ADC inputs; ASIL-D
- HV Measurement Accuracy <0.4%; 0-5V single ended
- Usable as ratiometric temperature sense inputs
- Configurable 1.8V/2.5V/3.3V reference for HV measurements
- Four Current Sense ADCs
- Measure up to two separate currents; ASIL-D
- Input range = +/-275mV differential, +/-750mV common mode; ASIL-D
- 0.1% accuracy. 10mA (50u Rshunt)
- Over Current Comparators
- Dedicated fast overcurrent digital comparator per CS ADC; ASIL-D
- Response : 100uS to 1mS. Accuracy: 1%
- Thresholds: 0mV to +/-300mV.
- OC response on GPIO pins.
- Majority voting option
- Upgraded Daisy Chain Interface
- 2x parallel SPI ports to MCU to support split chain with single bridge device
- 2-wire isolated interface, SPI to MCU
- 2Mbps single chain/ring, 4Mbps split chain for up to 4x speed improvement
- Closed Loop BCI: 200mA; Open Loop BCI: 300mA
- Isolation: Transformer or capacitor-only
- FDTI Time: <100ms for 800V packs or 250 cells
- Support for ring architecture
- Reverse wakeup available without ring architecture
- Smart EIS Engine
- Integrated Electrochemical Impedance Spectroscopy measurement engine
- Impedance Accuracy: 1% with 1A excitation, >200uΩ impedance
- Excitation frequency: 0.01Hz – 3.5kHz
- < 5us I/V synchronization from device to device
- Support for global excitation
- Other
- 12V switch drive pins to drive NMOSFET or Opto-MOS switches
- Package: 48-pin QFN, 0.5mm pitch
- Meets AEC-Q100 and ISO26262 ASIL-D Functional Safety
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- Power Consumption
- Active mode: < 100mW
- Sleep mode: < 0.5mW
- Deep sleep mode: < 0.05mW
- Power Consumption
The device can be used to measure divided down high voltage nodes in a battery system. It can measure voltages across Fuses and Contactors, and it can check isolation voltages in battery junction box (BJB) systems. The device has four integrated current sense paths supporting low side shunt resistors. Coulomb counting is available for accurate SOC calculation. There are 18 GPIOs/auxiliary inputs that can be used for HV measurements, thermistor measurements and driving relays. There are 4 SW outputs that can be used to drive MOSFET switches in the measurement path. The device can function as a SPI and I2C HUB and interface with up to 8 separate SPI devices/groups. Over current protection response can be achieved autonomously using OC Pins for fast reaction in dangerous over current events. The isolated bi-directional daisy chain ports support both capacitor and transformer based isolation. The device can also communicate with MCU over SPI.
技術文件
| 重要文件 | 類型 | 標題 | 格式選項 | 下載最新的英文版本 | 日期 | |
|---|---|---|---|---|---|---|
| * | 資料表 | BQ79881-Q1 UIR Sensor with Pack-Level EIS and Voltage, Current and Insulation Resistance Monitoring in EV/BMS HV Automotive Applications datasheet | PDF | HTML | 2025/9/24 | ||
| 白皮書 | 採用電化學阻抗光譜的新一代電池監控 | PDF | HTML | PDF | HTML | 2026/6/9 |
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)。
BQ79826-Q1-DESIGN — BQ79826Z-Q1 design resources
BQ79881-Q1-DESIGN — BQ79881-Q1 design resources
BQ79881-Q1-FS — Functional Safety documentation for BQ79881-Q1
EIS-BQ798XX-Q1-DESIGN — BQ798XX-Q1 Electrochemical Impedance Spectroscopy Design resources
BQ79881-Q1-SW — BQ79881-Q1 software
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| HTQFP (PHP) | 48 | Ultra Librarian |
訂購與品質
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。