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Texas Instruments bq34210-Q1 Automotive CEDV Fuel Gauge

Texas Instruments bq34210-Q1 Automotive 1-Series Cell System-Side CEDV Fuel Gauge provides fuel gauging and End-of-Service (EOS) Determination for 1-series cell batteries in applications that encounter infrequent discharge. These applications include eCall systems and uninterruptible power supplies (UPS) for backup during power failures, where batteries may stay connected to a charging power source for most of the device's lifetime until needed. Several battery chemistries are supported on the device, including Li-Ion, LiFePO4, and NiMH.

The gas gauging function utilizes voltage, current, and temperature data along with Compensated End-of-Discharge (CEDV) technology to provide State-of-Charge (SOC) and State-of-Health (SOH) data. The bq34210-Q1 EOS Determination function alerts when battery capability has degraded and is approaching the end of its usable service. The device battery fuel gauging requires connections only to PACK+ (P+) and PACK– (P–) for a removable battery pack or embedded battery management system. The Texas Instruments bq34210-Q1 devices are AEC-Q100 qualified for automotive applications.

Features

  • Automotive-qualified AEC-Q100, Grade 3
  • 1-series cell battery fuel gauge supports Li-Ion, LiFePO4, and NiMH (3-cell) chemistries
    • Resides on system board
    • Powers directly from the battery with integrated LDO
    • Supports a low-value external sense resistor (10mΩ)
  • Learning Load Enable (LEN) from host
  • Ultra-low power consumption in NORMAL (50µA) and SLEEP (9µA) modes
  • Supports replacement batteries
  • Accurate End-of-Service (EOS) determination for batteries in rarely discharged applications
  • CEDV gas gauge for 1-series cell batteries, providing
    • State-of-Charge (SOC)
    • Time-to-Empty (TTE)
    • State-of-Health (SOH)
  • High-side and low-side current sensing options
  • Internal temperature sensor or external thermistor
  • Microcontroller peripheral interface supports
    • 400kHz I2C™ serial interface
    • Configurable interrupt (ALERT) for SOC, battery levels, temperature faults, and charge/discharge status

Applications

  • eCall systems
  • Telematics backup systems
  • Uninterruptible Power Supply (UPS) backup systems
  • Emergency battery power modules

Block Diagram

Block Diagram - Texas Instruments bq34210-Q1 Automotive CEDV Fuel Gauge
Published: 2019-05-16 | Updated: 2025-03-11