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Texas Instruments BQ79718B-Q1 Battery Monitor

Texas Instruments BQ79718B-Q1 Battery Monitor is an automotive device that provides precise cell voltage measurements for up to 18-series battery modules. This enables high-voltage Battery Management Systems (BMS) in xEV and EV applications. This battery monitor offers various channel options in the same package type, providing pin-to-pin compatibility. The BQ79718B-Q1 device is designed for centralized or distributed architectures in xEV powertrain with the daisy-chain isolated by a transformer or capacitor. This battery monitor is AEC-Q100 qualified for automotive applications. The BQ79718B-Q1 monitor is ideal for Battery Management System (BMS) in hybrid and electric powertrain systems, energy storage battery packs with BMS.

Features

  • 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 C1:
    • Functional safety-compliant
    • Documentation to aid ISO 26262 system design–systematic capability up to ASIL D
    • Hardware capability up to ASIL D
  • Measure 9 to 18 batteries in series per device, stackable up to 64 devices
  • Dedicated ADC with typical ±1mV accuracy
  • Cell voltage and battery pack current measurement synchronized to 64μs
  • Support limp home mode with full redundancy
  • Integrated post-ADC configurable digital low-pass filters
  • Supports busbar without affecting measurement accuracy
  • 12 GPIOs for temperature sensor/analog/digital/I2C controller/SPI controller
  • Internal cell balancing:
    • Balancing at 300mA
    • User-controlled PWM adjustment cell balancing current
    • Built-in balancing thermal management with automatic pause and resume control
  • Robust daisy chain communication and support ring architecture
  • Hardware reset by host simulates POR-like event without battery removal
  • Support transformer and capacitive isolation
  • On-chip memory for one-time custom programming
  • <6μA low power mode current 
  • Compatible with BQ79600-Q1 with SPI/UART interface

Applications

  • Battery Management System (BMS) in hybrid and electric powertrain systems
  • Energy storage battery packs with BMS

System Diagram

Texas Instruments BQ79718B-Q1 Battery Monitor
Published: 2025-11-04 | Updated: 2025-12-10