BQ79616-Q1 16-S Automotive Precision Battery Monitor, Balancer, and Integrated Protector

Author: EIS Release Date: Mar 22, 2021


Texas instruments hardware protector features ASIL-D compliance

Image of Texas Instruments' BQ79616-Q1 16-S Automotive Precision Battery Monitor, Balancer, and Integrated ProtectorTexas Instruments' BQ79616-Q1 provides high-accuracy cell voltage measurements in less than 200 μs for 16S battery modules in high-voltage battery management systems (BMS) in HEV/EV. The monitor offers different channel options in the same package type, providing pin-to-pin compatibility and supporting high reuse of the established software and hardware across any platform. The integrated front-end filters enable the system to implement with simple, low voltage rating, differential RC filters on the cell input channels. The integrated, post-ADC, low-pass filters enable filtered, DC-like, voltage measurements for better state-of-charge (SOC) calculation. This device supports autonomous internal cell balancing with temperature monitoring to auto-pause and resume balancing to avoid an overtemperature condition.

The inclusion of the isolated, bidirectional, daisy-chain ports supports capacitor- and transformer-based isolation allowing the most effective components to be used for centralized or distributed architectures commonly found in the xEV powertrain system. This device includes eight GPIOs or auxiliary inputs that can be used for external thermistor measurements. Host communication to the BQ79616-Q1 device can be connected via the device's dedicated UART interface or through a communication bridge device, BQ79600. An isolated, differential daisy-chain communication interface allows the host to communicate with the entire battery stack 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:
    • Ambient operating temperature range Grade 1: -40°C to +125°C
    • 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
  • ADC accuracy: ±1.5 mV
  • Pin-package and software compatible:
    • Stackable monitor 16S
  • Built-in redundancy path for voltage and temperature diagnostics
  • Highly accurate cell voltage measurements within 128 µs for all cell channels
  • Integrated post-ADC configurable digital low-pass filters
  • Supports bus bar connection and measurement
  • Built-in host-controlled hardware reset to emulate POR-like device reset
  • Supports internal cell balancing:
    • Balancing current: 240 mA
    • Built-in balancing thermal management with automatic pause and resume control
  • Isolated differential daisy-chain communication with an optional ring architecture
  • Embedded fault signal and heartbeat through the communication line
  • UART/SPI host interface/communication bridge device BQ79600-Q1
  • Built-in SPI master
Applications
  • BMS in hybrid and electric powertrain systems
  • Energy storage battery packs with BMS