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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 mm × 14 mm)
  • 26 Cell Voltage Measurement Channels
    • 26s – 0V to 5.5V range for cell, -2V to 2V range for busbar
    • 143V Absolute Maximum Rating, 12V minimum
    • Busbar support on every channel, except first channel
    • Stackable up to 128 devices per chain
  • Cell Voltage ADCs
    • < 1.7mV accuracy, -40 to 125C, Cell: 0V to 4.5V
    • Dedicated ADC per channel. Synchronized redundant measurement.
  • Current Sense ADC
    • Input range = ±275mV differential
    • 0.1% accuracy, 10mA (50uΩ RSHUNT)
  • 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
    • Precise device-to-device I/V synchronization
    • Support for pack and module excitation
  • Passive Cell Balancing with integrated FETs up to 300mA @ 85C odd/even balancing with programmable PWM control
  • GPIOs and Sensors
    • 20 GPIOs: Temp Sensor (NTC/PTC), ADC, voltage measurement, interrupt
    • SPI / I2C Hub Interface
    • Temperature Threshold for OTUT and cell balancing PCB temp
    • Pressure Threshold / Peak Detector (Active / Sleep)
  • Ultra-low Power Monitoring
    • Cell over-voltage, under-voltage (OVUV)
    • Cell over-temperature, under-temperature (OTUT)
    • Configurable monitoring period 0.5s to 64s
    • Reverse Wake Up based on selectable faults
  • Diagnostics & Protection
    • Redundant ADCs for cell voltage and temperature
    • Automatic diagnostics during cell balancing in active mode
    • Automatic open wire detection
    • On-chip memory for one-time customer programming
  • Upgraded Isolated Daisy Chain Interface
    • 2Mbps bus speed, Up to 4Mbps with dual SPI
    • Robust to BCI injections
    • Isolation: Transformer or capacitor only
    • FDTI Time: <100ms for 800V packs or 250 cells
    • Support for stack, ring, multidrop and split-ring
  • Low Power Consumption
    • Integrated DC-DC Converter
    • Shutdown: <10uA
    • Ultra-low power monitoring (Deep Sleep): <20uA
    • Active Mode: <5mA
  • Functional Safety-Compliant
    • Developed for functional safety applications
    • Documentation to aid ISO 26262 system design
    • Systematic capability and hardware integrity up to ASIL-D
  • AEC-Q100 Qualified Grade 1
  • Compatible with the BQ79881-Q1 pack monitor.
  • System-level hardware and software development platform with complex device drivers (CDD).
  • 100pin QFP, 0.4mm pitch, PowerPAD on bottom
  • 26 Cell Voltage Measurement Channels
    • 26s – 0V to 5.5V range for cell, -2V to 2V range for busbar
    • 143V Absolute Maximum Rating, 12V minimum
    • Busbar support on every channel, except first channel
    • Stackable up to 128 devices per chain
  • Cell Voltage ADCs
    • < 1.7mV accuracy, -40 to 125C, Cell: 0V to 4.5V
    • Dedicated ADC per channel. Synchronized redundant measurement.
  • Current Sense ADC
    • Input range = ±275mV differential
    • 0.1% accuracy, 10mA (50uΩ RSHUNT)
  • 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
    • Precise device-to-device I/V synchronization
    • Support for pack and module excitation
  • Passive Cell Balancing with integrated FETs up to 300mA @ 85C odd/even balancing with programmable PWM control
  • GPIOs and Sensors
    • 20 GPIOs: Temp Sensor (NTC/PTC), ADC, voltage measurement, interrupt
    • SPI / I2C Hub Interface
    • Temperature Threshold for OTUT and cell balancing PCB temp
    • Pressure Threshold / Peak Detector (Active / Sleep)
  • Ultra-low Power Monitoring
    • Cell over-voltage, under-voltage (OVUV)
    • Cell over-temperature, under-temperature (OTUT)
    • Configurable monitoring period 0.5s to 64s
    • Reverse Wake Up based on selectable faults
  • Diagnostics & Protection
    • Redundant ADCs for cell voltage and temperature
    • Automatic diagnostics during cell balancing in active mode
    • Automatic open wire detection
    • On-chip memory for one-time customer programming
  • Upgraded Isolated Daisy Chain Interface
    • 2Mbps bus speed, Up to 4Mbps with dual SPI
    • Robust to BCI injections
    • Isolation: Transformer or capacitor only
    • FDTI Time: <100ms for 800V packs or 250 cells
    • Support for stack, ring, multidrop and split-ring
  • Low Power Consumption
    • Integrated DC-DC Converter
    • Shutdown: <10uA
    • Ultra-low power monitoring (Deep Sleep): <20uA
    • Active Mode: <5mA
  • Functional Safety-Compliant
    • Developed for functional safety applications
    • Documentation to aid ISO 26262 system design
    • Systematic capability and hardware integrity up to ASIL-D
  • AEC-Q100 Qualified Grade 1
  • Compatible with the BQ79881-Q1 pack monitor.
  • System-level hardware and software development platform with complex device drivers (CDD).
  • 100pin QFP, 0.4mm pitch, PowerPAD on bottom
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Top documentation Type Title Format options Date
* Data sheet BQ79826Z-Q1 Automotive 26 S Battery Monitor with Smart EIS Engine datasheet (Rev. A) PDF | HTML Sep 8, 2026
Technical article Enabling the next phase of battery intelligence (Rev. A) PDF | HTML Aug 13, 2026
White paper Next-Generation Battery Monitoring With Electrochemical Impedance Spectroscopy (Rev. A) PDF | HTML Jun 3, 2026

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

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 (...)

Supported products & hardware
Driver or library

BQ79826-Q1-DESIGN — BQ79826Z-Q1 design resources

BQ79826Z-Q1 Document Repository
Supported products & hardware
Driver or library

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

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

BQ79826-Q1-SW — BQ79826-Q1 software

BQ79826-Q1 software
Supported products & hardware
Reference design

TIDA-010978 — Up to 1500V stackable battery management unit reference design with integrated EIS

This reference design is a full cell temperature sensing and high cell-voltage accuracy Lithium-ion (Li-ion), lithium iron phosphate (LiFePO4) battery pack (52s and 104s). The design monitors each cell voltage, cell temperature, impedance, while supporting integrated electrochemical impedance (...)
Supported products & hardware
Package Pins CAD symbols, footprints & 3D models
HTQFP (PZS) 100 Ultra Librarian
TI's Standard Terms and Conditions for Evaluation Items apply.

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