Texas Instruments bq7961x/bq7961x-Q1 Battery Monitors

Texas Instruments bq7961x/bq7961x-Q1 Battery Monitor, Balancer, and Protector provide high-accuracy cell voltage measurements in less than 200µs for 12S, 14S, and 16S battery modules in high-voltage battery management systems in HEV/EV. The family of monitors 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. The integrated front-end filters enable the system to implement with simple, low voltage rating, differential RC filters on the cell input channels. The integrated, post-ADC, low-pass filters enable filtered, DC-like voltage measurements for a better state of charge (SOC) calculation. The Texas Instruments bq7961x/bq7961x-Q1 supports autonomous internal cell balancing with temperature monitoring to auto-pause and resumes balancing to avoid an over-temperature condition.

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) and (BQ79616H-Q1), 14S (bq79614-Q1), and 12S (bq79612-Q1)
- Standalone monitor 48V system (bq75614-Q1)
Built-in redundancy path for voltage and temperature diagnostics

Highly accurate cell voltage measurements within 128µs 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 240mA
- Built-in balancing thermal management with automatic pause and resume control
Isolated differential daisy chain communication with an optional ring architecture
Embedded fault signal and heartbeat through a communication line
UART/SPI host interface/communication bridge device bq79600-Q1
Built-in SPI master