Overview
The BQ79614-Q1, produced by Texas Instruments, is a precision battery monitor, balancer, and integrated protector designed specifically for automotive applications. This device is part of the BQ7961x-Q1 family, which includes stackable monitors for 12S, 14S, and 16S battery modules. It is AEC-Q100 qualified and compliant with functional safety standards up to ASIL D, making it suitable for high-voltage battery management systems in hybrid and electric vehicles (HEV/EV).
The BQ79614-Q1 offers high-accuracy cell voltage measurements, internal cell balancing, and advanced communication interfaces, ensuring reliable and efficient battery management. Its design supports pin-to-pin compatibility and high reuse of software and hardware across different platforms, simplifying system integration and development.
Key Specifications
| Specification | Value |
|---|---|
| Device Temperature Range | –40°C to +125°C |
| ESD Classification | HBM Level 2, CDM Level C4B |
| ADC Accuracy | +/- 1.5mV |
| Cell Voltage Measurement Time | Within 128 µs for all cell channels |
| Balancing Current | 240 mA |
| Package Type | HTQFP (64-pin) |
| Body Size | 10.00 mm × 10.00 mm |
| Communication Interface | UART/SPI, Isolated Differential Daisy Chain |
| Functional Safety Compliance | ASIL D |
Key Features
- High-accuracy cell voltage measurements within 128 µs for all cell channels.
- Integrated post-ADC configurable digital low-pass filters for better state of charge (SOC) calculation.
- Supports internal cell balancing with a balancing current of 240 mA and built-in thermal management.
- Isolated differential daisy chain communication with optional ring architecture.
- Embedded fault signal and heartbeat through communication line.
- UART/SPI host interface and communication bridge device BQ79600-Q1.
- Built-in SPI master.
- Eight GPIOs or auxiliary inputs for external thermistor measurements.
- Built-in redundancy path for voltage and temperature diagnostics.
- Built-in host-controlled hardware reset to emulate POR-like device reset.
Applications
- Battery Management System (BMS) in hybrid and electric powertrain systems.
- Energy storage battery packs with Battery Management Systems.
- High-voltage battery management systems in HEV/EV.
Q & A
- What is the BQ79614-Q1 used for?
The BQ79614-Q1 is used as a precision battery monitor, balancer, and integrated protector in high-voltage battery management systems, particularly in hybrid and electric vehicles (HEV/EV).
- What are the key features of the BQ79614-Q1?
Key features include high-accuracy cell voltage measurements, internal cell balancing, integrated post-ADC low-pass filters, isolated differential daisy chain communication, and built-in thermal management.
- What is the temperature range of the BQ79614-Q1?
The device operates within a temperature range of –40°C to +125°C.
- What is the ADC accuracy of the BQ79614-Q1?
The ADC accuracy is +/- 1.5mV.
- How does the BQ79614-Q1 support cell balancing?
The device supports internal cell balancing with a balancing current of 240 mA and includes built-in thermal management to auto-pause and resume balancing to avoid overtemperature conditions.
- What communication interfaces does the BQ79614-Q1 support?
The device supports UART/SPI interfaces and an isolated differential daisy chain communication interface with optional ring architecture.
- Is the BQ79614-Q1 compliant with functional safety standards?
Yes, it is compliant with functional safety standards up to ASIL D and is developed for functional safety applications.
- What package type does the BQ79614-Q1 come in?
The device comes in a HTQFP (64-pin) package.
- Can the BQ79614-Q1 be used in other battery configurations?
Yes, it is part of a family that includes stackable monitors for 12S, 14S, and 16S battery modules, offering pin-to-pin compatibility and high reuse of software and hardware.
- How does the BQ79614-Q1 handle communication line breaks?
The daisy-chain communication interface is configurable to a ring architecture, allowing the host to communicate with devices at either end of the stack in case of a communication line break.
