BMA7X18 Evaluation Board with Isolated Daisy Chain

EVBMA7X18DT1
Preproduction
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The EVBMA7X18 is an electrochemical impedance spectroscopy (EIS) -capable distributed cell monitoring unit (CMU) with electrical transport protocol link (eTPL) communication. It is ideal for rapid prototyping of high-voltage battery management system (HVBMS) hardware and software. This board contains one BMA7418 analog front end (AFE) which enables its integrated discrete fourier transform (DFT) feature of EIS measurements. The pin and feature compatibility between the BMA7418 and BMA7118 allows the EVBMA7X18 to also be used in the evaluation of the BMA7118.

Block Diagram

EVBMA7X18DT1 - Evaluation Board with eTPL

EVBMA7X18DT Block Diagram
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Supported Devices

Battery Management

Battery Cell Controllers

  • BMA7118: 18 Channel Li-Ion Battery Cell Controller IC ASIL D
  • BMA7418: 18 Channel Li-Ion Battery Cell Controller IC ASIL D with EIS

Features

Voltage Measurement

  • 1x BMA7118 battery cell controllers (BCCs) for up to 18 cells, extendable by adding more CMUs to the daisy chain
  • Life-time guaranteed high-accuracy cell voltage measurement channels, with averaging and advanced filtering

Integrated Discrete Fourier Transform (DFT) for EIS Support

  • Extraction of one selectable frequency
  • Configurable observation window
  • Support of synchronized measurement start across multiple daisy chains

Temperature Measurement

  • 9x analog inputs for negative temperature coefficient (NTC) temperature sensors

Cell Balancing

  • Integrated passive cell balancing up to 300 mA peak

Communication

  • Isolated eTPL communication between the CMU and BMU

Cost Reduction

  • Optimized bill of materials (BOM) using capacitive isolation on and off board

Documentation

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