NEU

BQ79826Z-Q1

VORSCHAU

26-S-Batterieüberwachung u. -Balancer mit elektrochemischer Impedanzspektroskopie-Engine, Automob

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Datenblatt

document-pdfAcrobat BQ79826Z-Q1 Automotive 26 S Battery Monitor with Smart EIS Engine datasheet (Rev. A) (Englisch) PDF | HTML

BQ79826Z-Q1

VORSCHAU

Datenblatt

Jetzt bestellen

Produktdetails

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-Dokumentation	Typ	Titel	Format-Optionen	Datum
*	Datenblatt	BQ79826Z-Q1 Automotive 26 S Battery Monitor with Smart EIS Engine datasheet (Rev. A)	PDF \| HTML	08.09.2026
	Technischer Artikel	Enabling the next phase of battery intelligence (Rev. A)	PDF \| HTML	13.08.2026
	Whitepaper	Next-Generation Battery Monitoring With Electrochemical Impedance Spectroscopy (Rev. A)	PDF \| HTML	03.06.2026

Design und Entwicklung

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Evaluierungsplatine

BQ79826Q1EVM-086 — BQ79826Z-Q1 – Evaluierungsmodul

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