Product details

Operating temperature range (°C) -40 to 125 Rating Automotive TI functional safety category Functional Safety-Compliant
Operating temperature range (°C) -40 to 125 Rating Automotive TI functional safety category Functional Safety-Compliant
HTQFP (PHP) 48 81 mm² 9 x 9
  • AEC-Q100 qualified –40°C to +125°C
  • Functional safety compliant
    • Documentation to aid ISO 26262 system design
    • Systematic capability up to ASIL D
    • Hardware capability up to ASIL D
  • 17 single-ended voltage channels
    • High voltage pack, link, charge measurement accuracy update to 0.2%
    • Pack and cell sync to 64uS
  • 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 BQ7971x-Q1 cell monitors
  • AEC-Q100 qualified –40°C to +125°C
  • Functional safety compliant
    • Documentation to aid ISO 26262 system design
    • Systematic capability up to ASIL D
    • Hardware capability up to ASIL D
  • 17 single-ended voltage channels
    • High voltage pack, link, charge measurement accuracy update to 0.2%
    • Pack and cell sync to 64uS
  • 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 BQ7971x-Q1 cell monitors

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. 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 up to 8 separate SPI devices/groups. The isolated bi-directional daisy chain ports support both capacitor and transformer based isolation. The device can also communicate with MCU over SPI and UART.

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. 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 up to 8 separate SPI devices/groups. The isolated bi-directional daisy chain ports support both capacitor and transformer based isolation. The device can also communicate with MCU over SPI and UART.

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Technical documentation

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* Data sheet BQ79735-Q1 Pack Voltage and Isolation Resistance Monitor for HV Automotive BMS Applications datasheet PDF | HTML 08 Oct 2024

Design & development

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

Driver or library

BQ7973X-Q1-DESIGN BQ7973x-Q1 design resources

BQ7973x-Q1 documentation repository
Supported products & hardware

Supported products & hardware

Products
Battery monitors & balancers
BQ79731-Q1 Automotive high-voltage battery pack monitor with voltage, current and insulation resistance sensing BQ79735-Q1 Automotive high-voltage battery pack monitor with voltage and insulation-resistance sensing
Driver or library

BQ7973X-Q1-EVALUATION BQ7973x-Q1 early evaluation files

BQ7973x-Q1 early evaluation files
Supported products & hardware

Supported products & hardware

Products
Battery monitors & balancers
BQ79735-Q1 Automotive high-voltage battery pack monitor with voltage and insulation-resistance sensing BQ79731-Q1 Automotive high-voltage battery pack monitor with voltage, current and insulation resistance sensing
Driver or library

BQ7973X-Q1-FMEDA BQ7973x-Q1 FMEDA files

BQ7973x-Q1 FMEDA files
Supported products & hardware

Supported products & hardware

Products
Battery monitors & balancers
BQ79731-Q1 Automotive high-voltage battery pack monitor with voltage, current and insulation resistance sensing BQ79735-Q1 Automotive high-voltage battery pack monitor with voltage and insulation-resistance sensing
Driver or library

BQ7973X-Q1-FUNCTIONAL-SAFETY-DOCS BQ7973x-Q1 functional safety documents

BQ7973x-Q1 functional safety documents
Supported products & hardware

Supported products & hardware

Products
Battery monitors & balancers
BQ79731-Q1 Automotive high-voltage battery pack monitor with voltage, current and insulation resistance sensing BQ79735-Q1 Automotive high-voltage battery pack monitor with voltage and insulation-resistance sensing
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HTQFP (PHP) 48 Ultra Librarian

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