Driver or library
BQ7971XB-Q1-DESIGN — BQ7971xB-Q1 Secure Resource folder
BQ7971xB-Q1 secure resources folder including datasheet, application notes, EVM userguides and other technical resources related to BQ7971xB-Q1
BQ79718B-Q1
Automotive, 18-S precise battery monitor, balancer and integrated protector with ASIL-D compliance
Data sheet
BQ79718B-Q1
- AEC-Q100 qualified with the following results:
- Device temperature grade 1: –40°C to +125°C ambient operating temperature range
- Device HBM ESD classification level 2
- Device CDM ESD classification level C1
- Functional Safety-Compliant
- Documentation to aid ISO 26262 system design
- Systematic capability up to ASIL D
- Hardware capability up to ASIL D
- Measure 9 to 18 batteries in series per device, stackable up to 64 devices
- Dedicated ADC with typical ±1mV accuracy
- Cell voltage and battery pack current measurement synchronized to 64µs
- Support limp home mode with full redundancy
- Integrated post-ADC configurable digital low-pass filters
- Supports busbar without affecting measurement accuracy
- 12 GPIOs for temp sensor/analog/digital/I2C controller/SPI controller
- Internal cell balancing
- Balancing at 300mA
- User controlled PWM adjustment cell balancing current
- Built-in balancing thermal management with automatic pause and resume control
- Robust daisy chain communication and support Ring Architecture
- Hardware reset by host simulates POR-like event without battery removal
- Support transformer and capacitive isolation
- On chip memory for one time custom programming
- Low power mode current <6µA
- Compatible with BQ79600-Q1 with SPI/UART interface
The BQ79718B-Q1 provides high-accuracy cell voltage measurements for up to 18S battery modules in high-voltage battery management systems in xEV/EV. The monitor offers different channel options in the same package type, providing pin-to-pin compatibility and supporting high reuse of the established software and hardware across any platform. This device has a state-of-the-art ADC architecture/measurement system meeting stringent automotive standard and safety requirements. The device is designed for centralized or distributed architectures in xEV powertrain with the daisy-chain isolated by transformer (or capacitor).
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Technical documentation
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View all 1 | Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | BQ79718B-Q1 Functional Safety-Compliant Automotive 18S Battery Monitor datasheet | PDF | HTML | 12 Aug 2025 |
Design & development
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Driver or library
BQ7971XB-Q1-FS — Functional Safety documentation for BQ7971XB-Q1
This secure folder stores Functional Safety document for BQ7971XB-Q1
Supported products & hardware
Products
Battery monitors & balancers
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| HTQFP (PAP) | 64 | Ultra Librarian |
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