1 Features

• AEC-Q100 qualified with the following results:

– Device temperature grade 1: –40°C to +125°C

ambient operating temperature range

• 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

• Two independent Current Sense ADCs with ±0.1%

gain error drift and input range +/-275mV.

• Programmable Over Current Detection

comparators

• Support limp home mode with full redundancy

• Integrated post-ADC configurable digital low-pass

filters

• Supports busbar without affecting measurement

accuracy

• 10 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

• 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 BQ79758-Q1 provides high-accuracy cell voltage

measurements for up to 18S battery modules in highvoltage

battery management systems in xEV/EV. The

monitor 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 a state-of-the-art ADC architecture/measurement

system meeting stringent automotive standard and

safety requirements. With the daisy-chain isolated

by transformer (or capacitor), the device is suitable

for centralized or distributed architectures in xEV

powertrain.