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).