24 and 26-Channel Li-Ion Battery Cell Controller IC ASIL D with EIS

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The BMA7424 and BMA7426 are automotive lithium-ion battery cell controllers (BCCs) integrated circuits (ICs) supporting 24 and 26 cells, respectively. They feature high-accuracy, highly synchronized analog-to-digital controllers (ADCs) on each voltage channel and integrate a discrete fourier transform (DFT) engine for electrochemical impedance spectroscopy (EIS). They offer pin compatibility and a shared software platform with non-EIS variants enabling a cost-effective EIS implementation. They consume only 4 mA (typ.) and support ASIL D functional safety.

Block Diagram

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BMA7424

24- and 26-Channel Li-Ion BCC IC ASIL D for EIS - BMA7424

BMA7426

24- and 26-Channel Li-Ion BCC IC ASIL D for EIS - BMA7426
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Features

Core Capabilities

  • From 8 to up to 26 cells per device (24 cells for BMA7424 and 26 cells for BMA7426)
  • 13 external temperature and auxiliary measurements
  • Dedicated high-accuracy ADC per voltage measurement channel with high-synchronization capability required for EIS
  • Typical ±0.7 mV measurement error with ultra-low long-term drift
  • ISO 26262 ASIL D support for cell voltage and temperature measurements
  • External temperature and auxiliary voltage measurements
  • Isolated daisy chain up to 62 nodes or serial peripheral interface (SPI) communication
  • Diagnostics, functional safety and robustness
  • Low external bill of materials (BOM) cost

On-Board Passive Cell Balancing

  • Up to 300 mA peak cell balancing with diagnostics
  • Automatic odd/even balancing sequence
  • Timer, voltage, temperature, PWM-controlled balancing
  • Low integrated balancing MOSFET RdsON

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Hardware

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4 hardware offerings

Software

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2 software files

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