1 Features

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

- Power Consumption
  - Active mode: < 100mW
  - Sleep mode: < 0.5mW
  - Deep sleep mode: < 0.05mW