1 Features

• AEC-Q100 qualified with –40°C to +125°C ambient

temperature range

• Functional Safety Compliant targeted

– Documentation to aid ISO 26262 system design

– Systematic capability up to ASIL D targeted

– Hardware capability up to ASIL D targeted

• Measure 9-18 batteries in series per device,

stackable up to 35 devices

• Dedicated ADC per cell with +/- 1mV accuracy

• Cell voltage and battery pack current

measurement synchronized to 64us

• Support limp home mode with full redundancy

• Integrated post-ADC configurable digital low-pass

filters

• Supports bus bar without affecting measurement

accuracy

• 12 GPIOs for temp sensor/analog/digital/I2C

Controller/SPI Controller

• Internal cell balancing

– Balancing at 300 mA

– user control PWM adjustment balancing current

– Built-in balancing thermal management with

automatic pause and resume control

• Robust daisy chain communication and support

ring Architecture

• Hardware reset by host simulates POR-like event

without battery removal

• Support transformer and capacitive isolation

• On chip memory for one time custom programming

• Shutdown current <5uA

• Compatible with BQ79600-Q1 with SPI/UART

interface

2 Applications

• Battery Management System (BMS) in hybrid and

electric powertrain systems

• Energy storage battery packs with Battery

Management Systems

3 Description

The BQ79718-Q1 provides high-accuracy cell voltage

measurements for up to 18s battery modules in

high-voltage battery management systems in xEV/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. This device has state-of-the-art

ADC architecture/measurement system meeting the

stringent automotive standard/ safety requirement.

With the daisy chain isolated by transformer (or

capacitor), the device is suitable for centralized or

distributed architectures in xEV powertrain.