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Thread: Cannot Connect TC399 Upgraded from TC299

  1. #1
    New Member New Member eric_cal is on a distinguished road
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    Cannot Connect TC399 Upgraded from TC299

    Hi there,
    I'm trying to connect via the DAP port (miniWiggler) to a TC399 which is replacing a TC299 on one our products and am failing.
    The error messages from the memtool consists of "can't connect to target" and "can't connect to device via DAS".
    The DAS Device Scanner shows nothing while listing the device when a product with the TC299 is installed.
    This is the first time attempting to connect to the chip and program it.

    Any suggestions?

  2. #2
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    VincentWan is on a distinguished road
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    Hi,

    In general, we can check the following pins:

    /PORST
    XTAL
    HWCFG
    all relevant supply pins (Vdd, Vddp3, Vext, Vflex, Vddm, Vddsb, Vebu)
    /ESR0
    /TRST
    /TESTMODE

    With a debugger, we can also check the Reset Status Register (RSTSTAT) for hints.
    The views expressed here are my personal opinions, have not been reviewed or authorized by Infineon and do not necessarily represent the views of Infineon.

  3. #3
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    MoD is on a distinguished road
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    You made some adaptations for replacing the TC299 with a TC399? You can't remove TC299 and assemble TC399 instead directly.
    The views expressed here are my personal opinions, have not been reviewed or authorized by Infineon and do not necessarily represent the views of Infineon.

  4. #4
    New Member New Member eric_cal is on a distinguished road
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    Adaptations were not made, as it were.
    Looking at the schematic for the TC399 eval board (sheet 5), it appears that the TLF11251 (U503) needs to be added to the 1v25 buck converter circuit, even though it's denoted as optional. Currently we're seeing oscillation on the 3v3 and 1v3 rails.
    Are additional mods required to enable a 299 to 399 swap?
    Last edited by eric_cal; Feb 3rd, 2021 at 10:23 AM.

  5. #5
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    In this case you made shortcut between 3v3 and 1v3 via the TC399 itself. As I wrote you can't simple replace the TC299 by a TC399.
    TC299 ball J21 and K20 are VDDFL3 and on your board connected to 3,3V. TC399 ball J21 and K20 are connected to VDD and must be connected to 1,3V. Because this balls on TC399 are connected to other VDD pins via the substrate you make here an shortcut from 3,3V to 1,3V.
    This should be the reason for oscillation. Please note, I don't known if there is now any damage on the TC399 because of supplying VDD with 3,3V.
    The views expressed here are my personal opinions, have not been reviewed or authorized by Infineon and do not necessarily represent the views of Infineon.

  6. #6
    New Member New Member eric_cal is on a distinguished road
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    Thank you very much for the prompt reply.
    I'll have to get back to you at a later date once we've attempted and verified the fix.

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