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Texas Instruments bq79631-Q1 Battery Monitor & Balancer

Texas Instruments bq79631-Q1 Battery Monitor and Balancer provides high-accuracy measurement capable of measuring divided down voltages from high voltage nodes. These voltage nodes include 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 a low-side shunt resistor. The device can measure the insulation resistance with internal ADC and control any switching scheme needed for this measurement. Eight GPIOs/auxiliary inputs 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 Texas Instruments 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.

Features

  • 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
  • Eight GPIO inputs as IO, SPI, ADC, and temperature sensing
  • Isolated differential daisy-chain communication with an 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

Applications

  • Full electric, plug-in hybrid, and hybrid vehicles

Simplified System Diagram

Block Diagram - Texas Instruments bq79631-Q1 Battery Monitor & Balancer

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Published: 2022-03-01 | Updated: 2025-03-05