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BQ79718-Q1

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Automotive 18-s precise battery monitor, balancer and integrated protector compliant to ASIL-D

Product details

Number of series cells (min) 9 Vin (max) (V) 90 Features Cell balancing, High precision, I2C support, Integrated ADC, Multi-cell support, Open-wire detection, Overtemperature protection, Overvoltage protection, Separate MCU requirement, Stackable (built-in interface), Temperature sensing, Undertemperature protection, Undervoltage protection Number of series cells (max) 18 Operating temperature range (°C) -40 to 125 Rating Automotive Battery overvoltage protection (min) (V) 2.7 Battery overvoltage protection (max) (V) 5.1 TI functional safety category Functional Safety-Compliant Communication interface Daisy Chain, Daisy chain, I2C controller, SPI controller, UART
Number of series cells (min) 9 Vin (max) (V) 90 Features Cell balancing, High precision, I2C support, Integrated ADC, Multi-cell support, Open-wire detection, Overtemperature protection, Overvoltage protection, Separate MCU requirement, Stackable (built-in interface), Temperature sensing, Undertemperature protection, Undervoltage protection Number of series cells (max) 18 Operating temperature range (°C) -40 to 125 Rating Automotive Battery overvoltage protection (min) (V) 2.7 Battery overvoltage protection (max) (V) 5.1 TI functional safety category Functional Safety-Compliant Communication interface Daisy Chain, Daisy chain, I2C controller, SPI controller, UART
HTQFP (PAP) 64 144 mm² 12 x 12
  • 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
  • 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

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.

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.

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Technical documentation

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Type Title Date
* Data sheet BQ79718-Q1 Functional Safety-Compliant Automotive 18S Battery Monitor datasheet PDF | HTML 19 Dec 2022
White paper Simplifying Power Architectures With Low-Noise Power Devices PDF | HTML 07 Nov 2023
White paper How Innovation in Battery Management Systems is Increasing EV Adoption PDF | HTML 13 Dec 2022
White paper 電池管理系統創新如何提升 EV 採用率 PDF | HTML 13 Dec 2022
White paper 배터리 관리 시스템의 혁신이 EV 채택을 증가시키는 방법 PDF | HTML 13 Dec 2022

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

BQ79718EVM-049 — BQ79718 evaluation module, 18-S automotive precision battery monitor, balancer, integrated protector

The BQ79718EVM is an evaluation module (EVM) for the BQ79718-Q1. The BQ79718-Q1 provides high accuracy, channel measurements for nine to eighteen battery cells. With the inclusion of a daisy chain communication port, the BQ79718-Q1 device is stackable to support large stack configurations found (...)
Simulation tool

CMSO-3P-BCS — comemso battery cell simulator

The Battery Cell Simulator (BCS) is the core of any test Battery Management System (BMS). It allows the simulation of all required states and faults for the BMS on the cell level.
Simulation tool

MNOVA-3P-NOVACARTS — MicroNova NovaCarts cell module controller (CMC) simulator for validating battery management systems

The NovaCarts cell module controller (CMC) simulation can simulate up to 35 cell monitoring integrated circuits of the automotive battery cell monitors family. The simulator is connected to the battery management system (BMS) host via a daisy chain interface. Typical applications of the simulator (...)
From: MicroNova
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HTQFP (PAP) 64 View options

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