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BQ79826Z-Q1

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Automotive 26-S battery monitor and balancer with Electrochemical Impedance Spectroscopy engine

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Data sheet

BQ79826Z-Q1

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Product details

Rating Automotive Number of series cells (max) 26 Number of series cells (min) 9 Features AEC-Q100 Automotive Qual, ASIL-D, Cell balancing, Electrochemical Impedance Spectroscopy (EIS) Engine, High precision, I2C support, Integrated ADC, Integrated buck converter, Multi-cell support, Open-wire detection, Over-Voltage Protection, Overtemperature protection, Separate MCU requirement, Stackable (built-in interface), Temperature sensing, Under Voltage Protection, Undertemperature protection Vin (max) (V) 145 Communication interface Daisy chain, I2C controller, SPI Operating temperature range (°C) -40 to 125 Battery overvoltage protection (max) (V) 5.5 TI functional safety category Functional Safety-Compliant
Rating Automotive Number of series cells (max) 26 Number of series cells (min) 9 Features AEC-Q100 Automotive Qual, ASIL-D, Cell balancing, Electrochemical Impedance Spectroscopy (EIS) Engine, High precision, I2C support, Integrated ADC, Integrated buck converter, Multi-cell support, Open-wire detection, Over-Voltage Protection, Overtemperature protection, Separate MCU requirement, Stackable (built-in interface), Temperature sensing, Under Voltage Protection, Undertemperature protection Vin (max) (V) 145 Communication interface Daisy chain, I2C controller, SPI Operating temperature range (°C) -40 to 125 Battery overvoltage protection (max) (V) 5.5 TI functional safety category Functional Safety-Compliant
HTQFP (PZS) 100 196 mm² 14 x 14
  • 26 Channels
    • 26S – 0 to 5.5V range for cell, -2V to 2V range for busbar
    • 143V Abs Max Rating, 9V minimum
    • Busbar support on every channel, except first channel.
    • Stackable up to 128 devices
  • Voltage Accuracy
    • <1.7 mV accuracy, -40 to 125C, Cell: 0V to 5.5V
    • Dedicated ADC per channel. Synchronized redundant measurement.
  • Passive Cell Balancing with integrated FETs up to 300mA odd/even balancing with programmable PWM control
  • Smart EIS Engine
    • Integrated Electrochemical Impedance Spectroscopy measurement engine
    • Impedance Accuracy: 1% (with 1A excitation and 200uΩ impedance)
    • Measurement frequency: 0.01Hz to 3.5kHz
    • < 5us I/V synchronization from device to device
    • Support for global and local excitation
  • Sensor & GPIOs
    • 20 GPIO: Temp Sensor (NTC/PTC), voltage measurement, Interrupt
    • SPI / I2C Interface
    • Temperature Threshold (Active / Sleep)
    • Pressure Threshold / Peak Detector (Active / Sleep)
    • On-chip memory for one-time custom programming
  • Diagnostics & Protection
    • Monitoring
      • Low Power Monitoring Mode (<20uA power consumption)
      • Cell Over-voltage, Under-voltage (OVUV)
      • Cell Over-temperature, Under-temperature (OTUT)
      • 2x die temperature monitors
      • Supply (BAT)
      • Open Wire Detection
    • Reverse Wake Up based on selectable faults
    • Redundancy Paths
      • Cell Voltage
      • GPIO/NTC Voltage
      • Limp Home Mode
    • Diagnostics
      • Automatic diagnostics during cell balancing in active mode
    • Functional Safety Compliant
      • Developed under ISO26262
      • System and hardware capability up to ASIL-D
  • Upgraded Daisy Chain Interface
    • 2Mbps bus speed, Up to 4Mbps with dual SPI
    • <+/-5us device to device synchronization
    • Closed Loop BCI: 200mA, Open Loop BCI: 300mA
    • Isolation: Transformer or capacitor-only
    • FDTI Time: <100ms for 800V packs or 250 cells
    • Support for stack, ring, multidrop, and split-ring
    • Device-to-device automatic communications balancing
  • Power
    • Integrated DC-DC Converter
    • Shutdown: <10uA
    • Sleep Mode with monitoring: As low as 20uA
    • Active Mode: <5mA
  • Package
    • 100-pin QFP, 4mm pitch
    • PowerPad on bottom
  • 26 Channels
    • 26S – 0 to 5.5V range for cell, -2V to 2V range for busbar
    • 143V Abs Max Rating, 9V minimum
    • Busbar support on every channel, except first channel.
    • Stackable up to 128 devices
  • Voltage Accuracy
    • <1.7 mV accuracy, -40 to 125C, Cell: 0V to 5.5V
    • Dedicated ADC per channel. Synchronized redundant measurement.
  • Passive Cell Balancing with integrated FETs up to 300mA odd/even balancing with programmable PWM control
  • Smart EIS Engine
    • Integrated Electrochemical Impedance Spectroscopy measurement engine
    • Impedance Accuracy: 1% (with 1A excitation and 200uΩ impedance)
    • Measurement frequency: 0.01Hz to 3.5kHz
    • < 5us I/V synchronization from device to device
    • Support for global and local excitation
  • Sensor & GPIOs
    • 20 GPIO: Temp Sensor (NTC/PTC), voltage measurement, Interrupt
    • SPI / I2C Interface
    • Temperature Threshold (Active / Sleep)
    • Pressure Threshold / Peak Detector (Active / Sleep)
    • On-chip memory for one-time custom programming
  • Diagnostics & Protection
    • Monitoring
      • Low Power Monitoring Mode (<20uA power consumption)
      • Cell Over-voltage, Under-voltage (OVUV)
      • Cell Over-temperature, Under-temperature (OTUT)
      • 2x die temperature monitors
      • Supply (BAT)
      • Open Wire Detection
    • Reverse Wake Up based on selectable faults
    • Redundancy Paths
      • Cell Voltage
      • GPIO/NTC Voltage
      • Limp Home Mode
    • Diagnostics
      • Automatic diagnostics during cell balancing in active mode
    • Functional Safety Compliant
      • Developed under ISO26262
      • System and hardware capability up to ASIL-D
  • Upgraded Daisy Chain Interface
    • 2Mbps bus speed, Up to 4Mbps with dual SPI
    • <+/-5us device to device synchronization
    • Closed Loop BCI: 200mA, Open Loop BCI: 300mA
    • Isolation: Transformer or capacitor-only
    • FDTI Time: <100ms for 800V packs or 250 cells
    • Support for stack, ring, multidrop, and split-ring
    • Device-to-device automatic communications balancing
  • Power
    • Integrated DC-DC Converter
    • Shutdown: <10uA
    • Sleep Mode with monitoring: As low as 20uA
    • Active Mode: <5mA
  • Package
    • 100-pin QFP, 4mm pitch
    • PowerPad on bottom
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* Data sheet BQ79826Z-Q1 Automotive 26S/24S Battery Monitor with Smart EIS Engine datasheet PDF | HTML 29 Sep 2025

Design & development

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Evaluation board

BQ79826Q1EVM-086 — BQ79826Z-Q1 evaluation module

The BQ79826Z-Q1 Evaluation Module (EVM), also referred to as BMS086, describes the general features, theory of operation, hardware setup, and use of TI's BQ79826Z-Q1 device. The BQ79826ZQ1 device is a highly integrated stackable 26- cell monitor with up to 300mA passive balancing current (...)

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Driver or library

BQ79826-Q1-DESIGN — BQ79826Z-Q1 design resources

BQ79826Z-Q1 Document Repository
Supported products & hardware

Supported products & hardware

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Battery monitors & balancers
  • BQ79826Z-Q1 — Automotive 26-S battery monitor and balancer with Electrochemical Impedance Spectroscopy engine
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Driver or library

EIS-BQ798XX-Q1-DESIGN — BQ798XX-Q1 Electrochemical Impedance Spectroscopy Design resources

EIS design secure folder for BQ798XX-Q1
Supported products & hardware

Supported products & hardware

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Battery monitors & balancers
  • BQ79826Z-Q1 — Automotive 26-S battery monitor and balancer with Electrochemical Impedance Spectroscopy engine
  • BQ79881-Q1 — Automotive battery junction box pack monitor with Electrochemical Impedance Spectroscopy
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