Product details

Vin (Max) (V) 15 Features Integrated ADC, Overtemperature protection, Overvoltage protection, Stackable (built-in interface), Temperature sensing, Undertemperature protection, Undervoltage protection Rating Automotive
Vin (Max) (V) 15 Features Integrated ADC, Overtemperature protection, Overvoltage protection, Stackable (built-in interface), Temperature sensing, Undertemperature protection, Undervoltage protection Rating Automotive
HTQFP (PAP) 64 100 mm² 10 x 10
  • Qualified for automotive applications
  • AEC-Q100 Qualified with the following results:
    • Device temperature grade 1: –40°C to +125°C ambient operating temperature range
    • Device HBM ESD classification level 2
    • Device CDM ESD classification level C4B
  • Functional Safety-Compliant
    • Developed for functional safety applications
    • Documentation to aid ISO 26262 system design
    • Systematic capability up to ASIL D
    • Hardware capability up to ASIL D
  • Differential voltage measurements with integrated filtering
    • Pack+ , Fuse, Link±, Charge± measure
    • Isolation resistance voltage measurement
  • Integrated precision current measurement
    • Support low-side shunt resistor
  • Insulation resistance monitoring capability
  • 8 GPIO inputs as IO, SPI, ADC, and temperature sense
  • Isolated differential daisy-chain communication with optional ring architecture
    • Simplifies BJB/BDU system by eliminating safety MCU, CAN transceivers, and multi-wire interface
  • UART host interface
  • Synchronized current and voltage measurements
  • Stackable as well as syncs with other cell and UI monitors 16S (BQ79616-Q1, BQ79656-Q1), 14S (BQ79614-Q1, BQ79654-Q1), 12S (BQ79612-Q1, BQ79652-Q1) and BQ79631
  • Built-in SPI master
  • Qualified for automotive applications
  • AEC-Q100 Qualified with the following results:
    • Device temperature grade 1: –40°C to +125°C ambient operating temperature range
    • Device HBM ESD classification level 2
    • Device CDM ESD classification level C4B
  • Functional Safety-Compliant
    • Developed for functional safety applications
    • Documentation to aid ISO 26262 system design
    • Systematic capability up to ASIL D
    • Hardware capability up to ASIL D
  • Differential voltage measurements with integrated filtering
    • Pack+ , Fuse, Link±, Charge± measure
    • Isolation resistance voltage measurement
  • Integrated precision current measurement
    • Support low-side shunt resistor
  • Insulation resistance monitoring capability
  • 8 GPIO inputs as IO, SPI, ADC, and temperature sense
  • Isolated differential daisy-chain communication with optional ring architecture
    • Simplifies BJB/BDU system by eliminating safety MCU, CAN transceivers, and multi-wire interface
  • UART host interface
  • Synchronized current and voltage measurements
  • Stackable as well as syncs with other cell and UI monitors 16S (BQ79616-Q1, BQ79656-Q1), 14S (BQ79614-Q1, BQ79654-Q1), 12S (BQ79612-Q1, BQ79652-Q1) and BQ79631
  • Built-in SPI master

BQ79631-Q1 provides high-accuracy measurement capable of measuring divided down voltages from high voltage nodes such as Pack+ (HV Battery Positive terminal), Fuse, Charge (Port), Link (Load) in a battery junction box (BJB) or battery disconnect unit (BDU) system. Key voltage measurements can make use of the integrated digital low-pass filters. The device has a highly accurate integrated current sense ADC capable of measuring current in low-side shunt resistor. The device is capable of measuring the insulation resistance with internal ADC and able to control any switching scheme needed for this measurement. There are eight GPIOs/auxillary inputs that can be used for thermistor measurement, driving relays, measuring voltages, and being a master SPI interface to peripheral SPI devices. The isolated bi-directional daisy-chain ports support both capacitor or transformer based isolation. The device also supports communication over UART.

Host communication to the BQ79631-Q1 can be connected via the device’s dedicated UART interface or through a communication bridge device, BQ79600-Q1. Additionally, an isolated, differential daisy-chain communication interface allows the host to communicate with the other UIR monitors and even cell monitors over a single interface. In the event of a communication line break, the daisy-chain communication interface is configurable to a ring architecture that allows the host to talk to devices at either end of the stack.

BQ79631-Q1 provides high-accuracy measurement capable of measuring divided down voltages from high voltage nodes such as Pack+ (HV Battery Positive terminal), Fuse, Charge (Port), Link (Load) in a battery junction box (BJB) or battery disconnect unit (BDU) system. Key voltage measurements can make use of the integrated digital low-pass filters. The device has a highly accurate integrated current sense ADC capable of measuring current in low-side shunt resistor. The device is capable of measuring the insulation resistance with internal ADC and able to control any switching scheme needed for this measurement. There are eight GPIOs/auxillary inputs that can be used for thermistor measurement, driving relays, measuring voltages, and being a master SPI interface to peripheral SPI devices. The isolated bi-directional daisy-chain ports support both capacitor or transformer based isolation. The device also supports communication over UART.

Host communication to the BQ79631-Q1 can be connected via the device’s dedicated UART interface or through a communication bridge device, BQ79600-Q1. Additionally, an isolated, differential daisy-chain communication interface allows the host to communicate with the other UIR monitors and even cell monitors over a single interface. In the event of a communication line break, the daisy-chain communication interface is configurable to a ring architecture that allows the host to talk to devices at either end of the stack.

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Type Title Date
* Data sheet BQ79631-Q1 UIR Sensor with Voltage, Current, and Insulation Resistance Monitoring in EV/BMS HV Automotive Applications datasheet PDF | HTML 13 Dec 2021
Technical article Intelligent junction box with voltage and current synchronization in EVs 08 Apr 2022
Certificate BQ79631EVM-039 EU RoHS Declaration of Conformity (DoC) 09 Jun 2021
EVM User's guide BQ79631EVM Evaluation Module User's Guide 13 Feb 2021
Application note BQ79616-Q1 Software Design Reference (Rev. A) 14 Dec 2020

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