MC33777 Battery Junction Box Reference Design

RDA777T

Click image to open expanded view

The RDA777T is the official MC33777 reference design.

  • The RDA777T2 integrates the MC33777A
  • The RDA777T3 integrates the MC33777B

This reference design enables rapid prototyping of battery junction box (BJB) solutions for automotive and industrial applications. The MC33777 supports ASIL D - capable current measurement, high accuracy voltage measurement and pyrotechnic switch control, making it suitable for safety critical battery architectures.

The RDA777T showcases a typical MC33777 system implementation designed to meet automotive constraints. Communication is implemented through an isolated daisy chain interface, simplifying integration into high-voltage battery systems.

Block Diagram

RDA777T

BMA8420 Electrochemical Impedance Spectroscopy (EIS) Battery Junction Box Reference Design
Get diagram PDF

Supported Devices

Battery Management

Battery Sensors

  • MC33777: Battery Junction Box Monitor IC

Features

Current Measurement

  • Current measurement with external shunt resistor
  • Supports up to 2 ASIL D measurements
  • Shunt temperature measurement with an external NTC resistor

High-Voltage Measurement

  • 8 positive measurements (up to +1 kV) with high accuracy
  • 2 bipolar measurements (up to ±1 kV) with high accuracy

Isolation Measurement

  • Isolation resistance measurement between high voltage and low voltage domains

Connectivity

  • Isolated electrical transport protocol link (ETPL) with BMS controller
  • Crash signal input monitoring

Power Supply

  • Isolated power supply taking +12 V as input

Buy Options

RDA777T2-Image

Click to expand

RDA777T2
Active

MC33777A Battery Junction Box Reference Design.

    $436.00 USD
    In Stock :5

    Normally ships 1-2 business days

    ADD TO CART
    Order from distributors
    RDA777T3-Image

    Click to expand

    RDA777T3
    Active

    MC33777B Battery Junction Box Reference Design.

      $489.24 USD
      In Stock :4

      Normally ships 1-2 business days

      ADD TO CART
      Order from distributors

      Documentation

      Quick reference to our documentation types

      Filters

      2 documents

      Compact List

      Design Resources

      Select a section:

      Related Hardware

      Quick reference to our board types.
      Filters

      5 hardware offerings

      Design Files

      Quick reference to our design files types.
      Filters

      4 design files

      Software

      Quick reference to our software types.

      Filters

      2 software files

      Note: For better experience, software downloads are recommended on desktop.

      Support

      What do you need help with?

      • Narrow your search
      Search