Driver or library
BQ79731B-Q1-DESIGN — BQ79731B-Q1 secure resources
BQ79731B-Q1 secure resources
BQ79731B-Q1
Automotive 6-S battery junction box current sense UIR sensor with vertical interface
Data sheet
BQ79731B-Q1
- AEC-Q100 qualified –40°C to +125°C
- Functional safety compliant
- Documentation to aid ISO 26262 system design
- Systematic capability up to ASIL D
- Hardware capability up to ASIL D
- 17 single-ended voltage channels
- High voltage pack, link, charge measurement accuracy update to 0.2%
- Pack and cell VI sync to 64µS
- 2 independent current sense ADCs
- ±0.15% gain error drift
- Input range = ±275mV
- 2 Over current detect comparators
- ±1% accuracy
- Selectable bi-directional thresholds
- Programmable OC
- Integrated Coulomb counting
- 15 GPIO inputs as IO, I2C, SPI, ADC and temp sense
- Dedicated MOSFET switch drive pins
- Intelligent SPI contoller HUB
- Support multiple SPI peripheral devices
- HW pin to trigger contactor drivers and Pyro Fuse drivers
- Stackable and register map compatible with BQ7971x-Q1 cell monitors
BQ79731B-Q1 can be used to measure divided down high voltage nodes in a battery system. The device can measure voltage across Fuse, Contactors and check isolation voltage in a battery junction box (BJB) system. The device has two integrated current sense paths supporting low-side shunt resistor. Coulomb counting function is available for accurate SOC calculation. There are 15 GPIOs/auxiliary inputs that can be used for HV measurements, thermistor measurements, and driving relays. There are four SW outputs that can be used to drive MOSFET switches in the measurement path. The device can function as a SPI HUB and interface with up to eight separate SPI devices/groups. Over current protection response can be achieved autonomously using HW pins for fast protection 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 and UART.
Technical documentation
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View all 1 | Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | BQ79731B-Q1 Pack Voltage Current and Isolation Resistance Monitor for HV Automotive BMS Applications datasheet | PDF | HTML | 12 Dec 2025 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.
Driver or library
BQ79731B-Q1-FS — Functional Safety documentations of BQ79731B-Q1
Functional Safety documentations of BQ79731B-Q1
Supported products & hardware
Products
Battery monitors & balancers
Driver or library
BQ7973XB-Q1-DESIGN — Secure resource folder of BQ7973XB-Q1
Secure resource folder of BQ7973XB-Q1
Supported products & hardware
Products
Battery monitors & balancers
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| HTQFP (PHP) | 48 | Ultra Librarian |
Ordering & quality
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Information included:
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