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BQ79731-Q1

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Automotive battery junction box voltage monitor, current sensor and isolation impedance sensor

Product details

Vin (max) (V) 20 Features High precision, Integrated ADC, Overtemperature protection, Overvoltage protection, Stackable (built-in interface), Temperature sensing, Undertemperature protection, Undervoltage protection Operating temperature range (°C) -40 to 125 Rating Automotive Battery overvoltage protection (min) (V) 6 Battery overvoltage protection (max) (V) 20 TI functional safety category Functional Safety-Compliant Communication interface Daisy Chain, SPI controller, UART Operating current (typ) (µA) 5000
Vin (max) (V) 20 Features High precision, Integrated ADC, Overtemperature protection, Overvoltage protection, Stackable (built-in interface), Temperature sensing, Undertemperature protection, Undervoltage protection Operating temperature range (°C) -40 to 125 Rating Automotive Battery overvoltage protection (min) (V) 6 Battery overvoltage protection (max) (V) 20 TI functional safety category Functional Safety-Compliant Communication interface Daisy Chain, SPI controller, UART Operating current (typ) (µA) 5000
HTQFP (PHP) 48 81 mm² 9 x 9
  • AEC-Q100 qualified –40°C to +125°C
  • 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
  • 17 single-ended voltage channels
    • High voltage pack, link, charge measurement accuracy <0.2%
    • Pack and cell VI sync to 64uS
  • 2 independent current sense ADCs (BQ79731-Q1)
    • ±0.05% gain error drift
    • Input range = ±275 mV
  • 2 Over current detect comparators (BQ79731-Q1)
    • ±1% accuracy
    • Selectable bi-directional thresholds
    • Programmable OC
  • Integrated Coulomb counting (BQ79731-Q1)
  • 15 GPIO inputs as IO, I2C, SPI, ADC and temp sense
  • Dedicated MOSFET switch drive pins
  • Intelligent SPI contoller HUB
    • Support multiple SPI peripheral devices
    • HW pin to trigger contactor drivers and Pyro Fuse drivers
  • Stackable and register map compatible with with cell monitors like the 18S (BQ79718)
  • AEC-Q100 qualified –40°C to +125°C
  • 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
  • 17 single-ended voltage channels
    • High voltage pack, link, charge measurement accuracy <0.2%
    • Pack and cell VI sync to 64uS
  • 2 independent current sense ADCs (BQ79731-Q1)
    • ±0.05% gain error drift
    • Input range = ±275 mV
  • 2 Over current detect comparators (BQ79731-Q1)
    • ±1% accuracy
    • Selectable bi-directional thresholds
    • Programmable OC
  • Integrated Coulomb counting (BQ79731-Q1)
  • 15 GPIO inputs as IO, I2C, SPI, ADC and temp sense
  • Dedicated MOSFET switch drive pins
  • Intelligent SPI contoller HUB
    • Support multiple SPI peripheral devices
    • HW pin to trigger contactor drivers and Pyro Fuse drivers
  • Stackable and register map compatible with with cell monitors like the 18S (BQ79718)

The device can be used to measure divided down high voltage nodes in a battery system. It can measure voltage across Fuse, Contactors and check isolation voltage in battery junction box (BJB) system. The device has two integrated current sense (BQ79731-Q1) paths supporting low side shunt resistor. Coulomb counting (BQ79731-Q1) function is available for accurate SOC calculation. There are 15 GPIOs/auxiliary inputs that can be used for HV measurements, thermistor measurements and driving relays. There are 4 SW outputs that can be used to drive MOSFET switches in the measurement path. The device can function as a SPI HUB and interface with upto 8 separate SPI devices/groups. Over current protection response can be achieved autonomously using HW Pins for fast protection in dangerous over current events. The isolated bi-directional daisy chain ports support both capacitor and transformer based isolation. The device can also communicate with MCU over SPI.

The device can be used to measure divided down high voltage nodes in a battery system. It can measure voltage across Fuse, Contactors and check isolation voltage in battery junction box (BJB) system. The device has two integrated current sense (BQ79731-Q1) paths supporting low side shunt resistor. Coulomb counting (BQ79731-Q1) function is available for accurate SOC calculation. There are 15 GPIOs/auxiliary inputs that can be used for HV measurements, thermistor measurements and driving relays. There are 4 SW outputs that can be used to drive MOSFET switches in the measurement path. The device can function as a SPI HUB and interface with upto 8 separate SPI devices/groups. Over current protection response can be achieved autonomously using HW Pins for fast protection in dangerous over current events. The isolated bi-directional daisy chain ports support both capacitor and transformer based isolation. The device can also communicate with MCU over SPI.

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Technical documentation

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Type Title Date
* Data sheet BQ79731-Q1 UIR Sensor with Voltage, Current and Insulation Resistance Monitoring in EV/BMS HV Automotive Applications datasheet PDF | HTML 19 Dec 2022
White paper 設計更安全、更智慧且更緊密相連的電池管理系統 PDF | HTML 24 Jan 2024
White paper 더욱 안전하고 스마트하며 더욱 연결된 배터리 관리 시스템 설계 PDF | HTML 24 Jan 2024
White paper Designing Safer, Smarter and More Connected Battery Management Systems PDF | HTML 23 Jan 2024
Technical article How solid-state relays simplify insulation monitoring designs in high-voltage applications PDF | HTML 04 Jan 2024
White paper Simplifying Power Architectures With Low-Noise Power Devices PDF | HTML 07 Nov 2023
Application brief Scaling accurate battery management solutions across energy storage systems PDF | HTML 20 Oct 2023
Technical article How to design an intelligent battery junction box for advanced EV battery manageme PDF | HTML 04 Jan 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
Certificate BQ79731Q1EVM EU RoHS Declaration of Conformity (DoC) (Rev. A) 03 Nov 2022
Technical article Intelligent junction box with voltage and current synchronization in EVs PDF | HTML 08 Apr 2022

Design & development

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Evaluation board

BQ79731Q1EVM-060 — BQ7973x-Q1 evaluation module for voltage, current and insulation resistance monitoring

The BQ79731Q1EVM evaluation module (EVM) also referred to as BMS060 describes the general features, theory of operation, hardware setup, and use of BQ7973x-Q1. These are highly integrated voltage, current and insulation resistance monitor devices primarily used in a battery junction box (BJB) (...)

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.
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