Product details

Rating Catalog Number of series cells (max) 18 Number of series cells (min) 9 Features Cell balancing, High precision, I2C support, Integrated ADC, Multi-cell support, Open-wire detection, Overtemperature protection, Overvoltage protection, Separate MCU requirement, Stackable (built-in interface), Temperature sensing, Undertemperature protection, Undervoltage protection Vin (max) (V) 90 Communication interface Daisy Chain, Daisy chain, I2C controller, SPI controller, UART Operating temperature range (°C) -40 to 125 Battery overvoltage protection (min) (V) 2.7 Battery overvoltage protection (max) (V) 5.1 TI functional safety category Functional Safety-Compliant
Rating Catalog Number of series cells (max) 18 Number of series cells (min) 9 Features Cell balancing, High precision, I2C support, Integrated ADC, Multi-cell support, Open-wire detection, Overtemperature protection, Overvoltage protection, Separate MCU requirement, Stackable (built-in interface), Temperature sensing, Undertemperature protection, Undervoltage protection Vin (max) (V) 90 Communication interface Daisy Chain, Daisy chain, I2C controller, SPI controller, UART Operating temperature range (°C) -40 to 125 Battery overvoltage protection (min) (V) 2.7 Battery overvoltage protection (max) (V) 5.1 TI functional safety category Functional Safety-Compliant
HTQFP (PAP) 64 144 mm2 12 x 12
  • Device qualified with the following results:
    • Device temperature grade 1: –40°C to +125°C ambient operating temperature range
    • Device HBM ESD classification level 2
    • Device CDM ESD classification level C1
  • Functional Safety-Compliant
    • Documentation to aid ISO 26262 and IEC 61508 system design
    • Systematic capability up to ASIL B and SIL2
    • Hardware intergity up to ASIL B and SIL 2
  • Measure 9 to 18 batteries in series per device, stackable up to 64 devices
  • Dedicated ADC with ±3.0mV accuracy for 1-5V input (-40°C to +125°C)
  • Cell voltage and battery pack current measurement synchronized to 64μs
  • Support limp mode with full redundancy
  • Integrated post-ADC configurable digital low-pass filters
  • Supports busbar without affecting measurement accuracy
  • 12 GPIOs for temp sensor/analog/digital/I2C controller/SPI controller
  • Internal cell balancing
    • Balancing at 300mA
    • User controlled PWM adjustment cell balancing current
    • Built-in balancing thermal management with automatic pause and resume control
  • Robust daisy chain communication and support Ring Architecture
  • Hardware reset by host simulates POR-like event without battery removal
  • Support transformer and capacitive isolation
  • On chip memory for one time custom programming
  • Low power mode current <6μA
  • Compatible with BQ79600-Q1 with SPI/UART interface
  • Device qualified with the following results:
    • Device temperature grade 1: –40°C to +125°C ambient operating temperature range
    • Device HBM ESD classification level 2
    • Device CDM ESD classification level C1
  • Functional Safety-Compliant
    • Documentation to aid ISO 26262 and IEC 61508 system design
    • Systematic capability up to ASIL B and SIL2
    • Hardware intergity up to ASIL B and SIL 2
  • Measure 9 to 18 batteries in series per device, stackable up to 64 devices
  • Dedicated ADC with ±3.0mV accuracy for 1-5V input (-40°C to +125°C)
  • Cell voltage and battery pack current measurement synchronized to 64μs
  • Support limp mode with full redundancy
  • Integrated post-ADC configurable digital low-pass filters
  • Supports busbar without affecting measurement accuracy
  • 12 GPIOs for temp sensor/analog/digital/I2C controller/SPI controller
  • Internal cell balancing
    • Balancing at 300mA
    • User controlled PWM adjustment cell balancing current
    • Built-in balancing thermal management with automatic pause and resume control
  • Robust daisy chain communication and support Ring Architecture
  • Hardware reset by host simulates POR-like event without battery removal
  • Support transformer and capacitive isolation
  • On chip memory for one time custom programming
  • Low power mode current <6μA
  • Compatible with BQ79600-Q1 with SPI/UART interface

The BQ78702B provides high-accuracy cell voltage measurements for up to 18S battery modules in high-voltage battery management systems in energy storage systems. This device has a state-of-the-art ADC architecture/measurement system meeting stringent safety requirements. With the daisy-chain isolated by transformer (or capacitor), the device is designed for centralized or distributed system architectures.

The BQ78702B provides high-accuracy cell voltage measurements for up to 18S battery modules in high-voltage battery management systems in energy storage systems. This device has a state-of-the-art ADC architecture/measurement system meeting stringent safety requirements. With the daisy-chain isolated by transformer (or capacitor), the device is designed for centralized or distributed system architectures.
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* Data sheet BQ78702B Functional Safety-Compliant Automotive 18S Battery Monitor datasheet PDF | HTML 23 Jun 2025

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BQ78702-DESIGN — Industrial 18-s stackable battery monitor, balancer and integrated protector compliant to ASIL-B

Design documents for BQ78702 battery monitor.
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Battery monitors & balancers
BQ78702B — 18-S stackable battery monitor with balancer and integrated protector compliant to ASIL-B
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HTQFP (PAP) 64 Ultra Librarian

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