Texas Instruments BQ79656-Q1 | Demoboard BQ79656EVM

Description

The BQ7965x-Q1 family of devices provides high-accuracy cell voltage measurements for a minimum of 6S to a maximum of 12S (BQ79652-Q1), 14S (BQ79654-Q1), or 16S (BQ79656-Q1) battery modules in less than 200 µs while these devices also support shunt-resistor current sense measurement. The integrated front-end filters enable the system to implement with simple, low voltage raring, differential RC filters on the cell input channels. The integrated, post-ADC, low-pass filters enable filtered, DC-like, voltage measurements. This family of devices also supports integrated current sensing capabilities with option to synchronize with cell voltage measurements for better state of charge (SOC) calculation. The device supports autonomous internal cell balancing with temperature monitoring to auto-pause and resume balancing to avoid an overtemperature condition.The inclusion of the isolated, bidirectional, daisy chain ports supports both capacitor- and transformer-based isolation, allowing the use of the most effective components for centralized or distribution architectures commonly found in the xEV powertrain system. This device also includes eight GPIOs or auxiliary inputs that can be used for external thermistor measurements.Host communication to the BQ7965x-Q1 family of devices can be connected via the device’s dedicated UART interface or through a communication bridge device, BQ79600. Additionally, an isolated, differential daisy-chain communication interface allows the host to communicate with the entire battery stack over a single interface. In the event of a communication line break, the daisy-chain communication interface is configurable to a ring architecture that allows the host to talk to devices at either end of the stack.

Features

• Qualified for automotive applications
• 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 C4B
• Functional Safety-Compliant
• Developed for functional safety applications
• Documentation to aid ISO 26262 system design
• Systematic capability up to ASIL D
• Hardware capability up to ASIL D
• +/- 1.5mV ADC accuracy
• Pin-package and software compatible device family:
• Stackable monitor 16S (BQ79616-Q1, BQ79656-Q1), 14S (BQ79614-Q1, BQ79654-Q1), and 12S (BQ79612-Q1, BQ79652-Q1)
• Standalone monitor 48 V system (BQ75614-Q1)
• Supports current-sense measurement
• Built-in redundancy path for voltage and temperature and current diagnostics
• Highly accurate cell voltage measurements within 128 µs for all cell channels
• Integrated post-ADC configurable digital low-pass filters
• Supports bus bar connection and measurement
• Built-in host-controlled hardware reset to emulate POR-like device reset
• Supports internal cell balancing
• Balancing current at 240 mA
• Built-in balancing thermal management with automatic pause and resume control
• 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/communication bridge device BQ79600-Q1
• Built-in SPI master

Typical applications

• Battery Management System (BMS) in hybrid and electric powertrain systems, energy storage battery packs with Battery Management Systems
• E-bikes, E-Scooters

More information

• Datasheet