1 Features

• 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 C1

• Functional Safety-Compliant

– Documentation to aid ISO 26262 system design

– Systematic capability up to ASIL D

– Hardware capability up to ASIL D

• Measure 9 to 18 batteries in series per device,

stackable up to 64 devices

• Dedicated ADC with typical ±1mV accuracy

• Cell voltage and battery pack current

measurement synchronized to 64μs

• Support limp home mode with full redundancy

• Integrated post-ADC configurable digital low-pass

filters

• Supports busbar without affecting measurement

accuracy

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

controller/SPI controller

• Internal cell balancing

– Balancing at 300mA

– User controlled PWM adjustment cell 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

• Low power mode current <6μA

• 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 BQ79718B-Q1 provides high-accuracy cell

voltage measurements for up to 18S battery

modules in high-voltage battery management systems

in xEV/EV. The monitor offers different channel

options in the same package type, providing pinto-

pinto-

pin compatibility and supporting high reuse of

the established software and hardware across any

platform. This device has a state-of-the-art ADC

architecture/measurement system meeting stringent

automotive standard and safety requirements. The

device is designed for centralized or distributed

architectures in xEV powertrain with the daisy-chain

isolated by transformer (or capacitor).