Product details

Vin (Max) (V) 20 Features Integrated ADC, Overtemperature protection, Overvoltage protection, Stackable (built-in interface), Temperature sensing, Undertemperature protection, Undervoltage protection Rating Automotive
Vin (Max) (V) 20 Features Integrated ADC, Overtemperature protection, Overvoltage protection, Stackable (built-in interface), Temperature sensing, Undertemperature protection, Undervoltage protection Rating Automotive
HTQFP (PHP) 48
  • 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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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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