Overview
The BQ79656-Q1, produced by Texas Instruments, is a highly advanced battery management system (BMS) component designed for automotive and other high-reliability applications. This device is part of the BQ7965x-Q1 family, which includes variants supporting 6S to 16S battery modules. It is AEC-Q100 qualified and compliant with functional safety standards, making it suitable for critical systems such as hybrid and electric vehicle powertrains.
The BQ79656-Q1 offers high-accuracy cell voltage measurements, integrated current sensing, and autonomous internal cell balancing with thermal management. It supports various communication interfaces, including UART, SPI, and isolated differential daisy-chain communication, ensuring robust and reliable system operation.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | HTQFP (64-pin) | - |
| Operating Temperature Range | -40 to 125 | °C |
| ADC Accuracy | +/- 1.5 mV | - |
| Cell Voltage Measurement Time | < 128 µs | - |
| Balancing Current | 240 mA | - |
| Thermal Shutdown (Rising) | 130 to 152 | °C |
| Supply Current in SHUTDOWN Mode | 16 to 23 µA | - |
| CVDD Load Regulation | -30 to 30 mV | - |
Key Features
- Qualified for automotive applications and AEC-Q100 compliant with a temperature grade 1: -40°C to +125°C ambient operating temperature range.
- Functional Safety-Compliant, developed for functional safety applications with systematic and hardware capability up to ASIL D.
- Highly accurate cell voltage measurements within 128 µs for all cell channels.
- Integrated post-ADC configurable digital low-pass filters for filtered, DC-like voltage measurements.
- Supports current-sense measurement and shunt-resistor current sense measurement.
- Autonomous internal cell balancing with temperature monitoring to auto-pause and resume balancing.
- Isolated differential daisy-chain communication with optional ring architecture.
- Embedded fault signal and heartbeat through communication line.
- 5 V LDO output to power external digital isolator.
- UART/SPI host interface and communication bridge device BQ79600-Q1.
- Built-in SPI master and host-controlled hardware reset.
- Eight GPIOs or auxiliary inputs for external thermistor measurements.
Applications
- Battery Management System (BMS) in hybrid and electric powertrain systems.
- Energy storage battery packs with Battery Management Systems.
- E-bikes and E-Scooters.
- Other high-reliability battery management applications requiring precise cell voltage and current monitoring.
Q & A
- What is the operating temperature range of the BQ79656-Q1?
The operating temperature range is -40°C to +125°C.
- What is the ADC accuracy of the BQ79656-Q1?
The ADC accuracy is +/- 1.5 mV.
- How quickly can the BQ79656-Q1 measure cell voltages?
The device can measure cell voltages in less than 128 µs for all cell channels.
- What is the balancing current of the BQ79656-Q1?
The balancing current is 240 mA.
- Does the BQ79656-Q1 support isolated communication?
- What communication interfaces does the BQ79656-Q1 support?
The device supports UART, SPI, and a communication bridge device BQ79600-Q1.
- Is the BQ79656-Q1 compliant with functional safety standards?
- Can the BQ79656-Q1 be used in automotive applications?
- What is the purpose of the built-in SPI master in the BQ79656-Q1?
The built-in SPI master facilitates communication and control within the battery management system.
- Does the BQ79656-Q1 support external thermistor measurements?
