Description:

The BQ7965x-Q1 family of devices provides high-accuracy battery voltage measurements for 6S to 12S (BQ79652-Q1), 14S (BQ79654-Q1), or 16S (BQ79656-Q1) battery modules in less than 200µs, while also supporting shunt resistor current-sense measurements. The integrated front-end filter enables the system to use simple, low-voltage-rated differential RC filters on the battery input channels. The integrated post-ADC low-pass filter enables filtered, DC-like voltage measurements. The device family also supports integrated current-sense detection, selectable to synchronize with battery voltage measurements for better state-of-charge (SOC) calculations. The device supports autonomous internal cell balancing and automatically suspends and resumes balancing by monitoring temperature to prevent overheating conditions.

Features:

• Qualified for automotive applications

• AEC-Q100 qualified with the following characteristics:

– 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 available to aid in 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 device family:

– Stackable monitors for 16S (BQ79616-Q1, BQ79616H-Q1, BQ79656-Q1), 14S (BQ79614-Q1, BQ79654-Q1), and 12S (BQ79612-Q1, BQ79652-Q1)

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

• Supports current-sense measurements

• Built-in redundant path for voltage, temperature, and current diagnostics

• High-accuracy cell voltage measurements for all cell channels in 128µs

• Integrated post-ADC configurable digital low-pass filter

• Supports bus bar connection and measurement

• Built-in hardware reset controlled by host for simulating POR-like device reset

• Supports internal cell balancing

– 240mA balancing current

– Built-in thermal management for balancing with automatic pause and resume control

• Isolated differential daisy-chain communication with optional ring architecture

• Embedded fault signal and heartbeat via communication line

• 5V LDO output to power external digital isolators

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

• Built-in SPI master controller

Applications:

• Battery Management Systems (BMS) in hybrid and electric powertrain systems

• Energy storage battery packs with battery management systems

• E-bikes and e-scooters