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Hi, Trying to get a single-node A2B setup working: EVAL-AD2428WD1BZ as Main, connected via ~1m cable to a Molex A2B accelerometer (part 2047490013-SD) as the only sub-node. Every Link + Download in SigmaStudio gives: Main Running Interrupt Not Detected Nu

Category: Hardware
Product Number: AD2428WD1BZ

  A2B network fails to discover sub-node on EVAL-AD2428WD1BZ + Molex accelerometer — "Main Running Interrupt Not Detected", 0 nodes found

  • Trying to get a single-node A2B setup working: EVAL-AD2428WD1BZ as Main, connected via ~1m cable to a Molex A2B accelerometer (part 2047490013-SD) as the only sub-node. Every Link + Download in SigmaStudio gives:

    Main Running Interrupt Not Detected Number of sub Nodes discovered: 0

    Things I've already checked, all fine:

    • Jumpers JP1/JP13/JP14 all in correct default state (regulator enabled, 7V)
    • Cable in P2 (downstream), continuity tested good, tried both wire orientations
    • Accelerometer I2C address set to 0x53 correctly in the project
    • Full project Link+Download (not just A2B-only) so the onboard ADAU1452 DSP is actually running and feeding BCLK/SYNC
    • Main's register view all looks like normal idle defaults (NODEADR, DISCVRY, etc.)
    • Slot/TDM config ruled out as unrelated — separate warning, not the cause of the discovery fault

    New thing I found: I can Read/Write the Main's registers fine once connected, but the sub-node's registers (e.g. trying to set I2SGCFG/I2SCFG per Molex's app note) are completely greyed out, even with checkboxes ticked. Guessing that's because sub-node access has to relay over A2B, which needs discovery to succeed first — so it's really just one root problem.

    Anyone seen this before or got ideas what else to check? Trying to avoid buying a Bus Analyzer if there's a simpler explanation I'm missing.

    Thanks


  • > Main Running Interrupt Not Detected
    Means USBi is not fully talking to your main node. Since you can read main node I2C it's almost certainly a bad frame sync (has to be 48 kHz).  Check at the AD2428 pin.

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