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This paper introduces BQ79614PAPRQ1 automotive class 14 series precision battery monitor, balancer and integrated protector according to ASIL-D standard

The BQ79614-Q1 device is ideal for:

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

• Energy storage battery pack with battery management system

Features

• Meets automotive application requirements

• Has the following characteristics according to AEC-Q100 standard:

- Device temperature Class 1: Ambient operating temperature range from -40 °C to +125°C

- HBM ESD classification level 2

- CDM ESD class C4B

• Meets functional safety standards

- Developed for functional safety applications

- Documentation to help with ISO 26262 system design

- The system meets ASIL Level D requirements

- The hardware meets ASIL D requirements

• +/- 1.5mV ADC accuracy

• Device families compatible with pins/packages and software:

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

- Independent Monitor 48V system (BQ75614-Q1)

• Built-in redundant paths for voltage and temperature diagnostics

Highly accurate battery voltage measurements can be performed for all battery channels within 128µs

• The integrated rear ADC can be configured with a digital low-pass filter

• Support bus bar connection and measurement

• Host controlled built-in hardware reset function that simulates POR-like device reset

• Support internal battery balance

- 240mA balance current

- Built-in balanced thermal management with automatic pause and resume control

• Isolated differential daisy-chain communication with an optional ring architecture

• Embedded fault signals and detection signals transmitted over communication lines

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

• Built-in SPI main device

Overview

The BQ79614-Q1 provides high-precision battery voltage measurement for 14S battery modules in HEV/EV medium and high voltage battery management systems in times up to 200μs. This series of monitors offers different channel options in the same package type, while offering pin-to-pin compatibility and supporting a high degree of reuse of existing software and hardware on any platform. With the integrated front-end filter, the system can be implemented using a simple, low-voltage differential RC filter on the battery input channel. Integrated post-ADC low-pass filters can perform filtered, direct-current-like voltage measurements to better calculate state of charge (SOC). This device supports autonomous internal battery balancing and automatically pauses and restores balance by monitoring temperature to avoid overheating conditions.