Description:

The BQ79612-Q1, BQ79614-Q1, and BQ79616-Q1 provide high-accuracy battery voltage measurements for 12S, 14S, and 16S battery modules in HEV/EV high-voltage battery management systems in less than 200μs. This family of monitors offers different channel options in the same package type, provides pin-to-pin compatibility, and supports high reuse of existing software and hardware on any platform. With an integrated front-end filter, a simple, low-voltage-rated differential RC filter can be used on the battery input channels for system implementation. The integrated post-ADC low-pass filter enables filtered, DC-like voltage measurements to better calculate the state of charge (SOC). This device supports autonomous internal cell balancing and automatically suspends and resumes balancing based on temperature monitoring to prevent over-temperature conditions.

Features:

• Qualified for automotive applications

• AEC-Q100 qualified with the following:

– 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

– System can meet ASIL D requirements

– Hardware can meet ASIL D requirements

• ±1.5mV ADC accuracy

• Pin/package and software compatible family:

– Stackable monitors 16S (BQ79616-Q1, BQ79656-Q1), 14S (BQ79614-Q1, BQ79654-Q1), and 12S (BQ79612-Q1, BQ79652-Q1)

– Standalone monitor for 48V systems (BQ75614-Q1)

• Built-in redundant path for voltage and temperature diagnostics

• Highly accurate cell voltage measurements on all battery channels in 128μs

• Integrated post-ADC configurable digital low-pass filter

• Supports busbar connection and measurement

• Host-controlled built-in hardware reset function to simulate a POR-like device reset

• Supports internal cell balancing

– 240mA balancing current

– Built-in balance thermal management with automatic suspend and resume control

• Isolated differential daisy-chain communication with optional ring architecture

• Embedded fault signaling and heartbeat via communication lines

• UART/SPI host interface/communication bridge device BQ79600-Q1

• Built-in SPI master

Applications:

• Battery management systems (BMS) in hybrid and electric powertrain systems

• Energy storage battery packs with battery management systems