1 Features
• Functional Safety-Compliant
– Documentation to aid ISO 26262 system design
– Systematic capability up to ASIL B
– Hardware capability up to ASIL B
• Measure 9 to 14 batteries in series per device,
stackable up to 64 devices
• Dedicated ADC with ±3.2mV accuracy over
temperature
• 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

2 Applications
• Energy storage systems
• Portable power stations

3 Description
The BQ78706 provides high-accuracy cell voltage
measurements for up to 14S battery modules in
high-voltage battery management systems in energy
storage systems (ESS) and portable power stations
(PPS). 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 architectures in residential,
commercial, or grid-scale energy storage systems.