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    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/7MDRAEJ2SZZ542OOLXWYB7MTY6DEWXU7/",
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    "message_id": "CANsNeaq-v2k7YQpxAcN0riZYw0CtVtfFXhfj5wqgFnpeYcuzrQ@mail.gmail.com",
    "message_id_hash": "7MDRAEJ2SZZ542OOLXWYB7MTY6DEWXU7",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/7MDRAEJ2SZZ542OOLXWYB7MTY6DEWXU7/",
    "sender": {
        "address": "rich (a) ourowndomain.com",
        "mailman_id": "de4e965f89da4d4790638af3cb47f33c",
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    "sender_name": "Rich Gopstein",
    "subject": "[pacsat-dev] Re: Latchup Protection and Watchdog Parts",
    "date": "2023-01-19T23:43:56Z",
    "parent": null,
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/TMTT25RTM7DQKSCSXQKBACGSH5MVEKFA/"
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    "content": "And - as long as I'm thinking about it, we had to disable the hardware\nwatchdog on the RT-IHU to get it to run.  I don't recall if that changed,\nbut if you get some RT-IHU boards, you might need to jumper the hardware WD\ndisable.\n\nRich\n\n\nOn Thu, Jan 19, 2023 at 6:40 PM Rich Gopstein via pacsat-dev <\[email protected]> wrote:\n\n> Burns might remember the details (or Zach certainly would), but one of\n> those parts was undersized for the RT-IHU and would cut out when we were\n> transmitting with the ax5043.  I think we had to back down the xmit power\n> in order for the device not to reset.\n>\n> Rich\n>\n>\n> On Thu, Jan 19, 2023 at 5:46 PM Jonathan Brandenburg via pacsat-dev <\n> [email protected]> wrote:\n>\n>> In last week's meeting, I noted I had been looking at the schematics for\n>> Fox-1 and RT-IHU and found the circuits for the latchup protection and\n>> watchdog functions. I admit this might be basic to some, but I'm finding\n>> it fascinating! Anyway...\n>>\n>> Since last week's meeting, I researched the parts used:\n>>\n>> onsemi FPF2001 is a current limit switch used on both Fox-1 and half the\n>> RT-IHU. It's obsolete, replaced by onsemi's FPF2000. But the FPF2000 is\n>> listed as end-of-life. It's replacement part is the TI TPS22942.\n>>\n>> MAX4995 is a current limit switch used on the other half of the. This\n>> part looks good for new designs.\n>>\n>>\n>> For the watchdog functionality, both Fox-1 and RT-IHU use the\n>> STWD100NYWY3F chip. this parts looks good for new designs.\n>>\n>>\n>> That's as far as I got. Next, I want to research the Fox-1 and RT-IHU\n>> designs to determine the thresholds of the current limit switches. In\n>> particular, I want to see if the TPS22942 is a suitable replacement,\n>> assuming we have the same current requirements.\n>>\n>> That's where I'm at,\n>>\n>> Jonathan\n>>\n>>\n>> --\n>> Jonathan Brandenburg\n>> Radio Amateur Satellite Corporation\n>> 1-214-213-1066\n>>\n>>\n>> -----------------------------------------------------------\n>>\n>> pacsat-dev mailing list -- [email protected]\n>> View archives of this mailing list at\n>> https://mailman.amsat.org/hyperkitty/list/[email protected]\n>> To unsubscribe send an email to [email protected]\n>> Manage all of your AMSAT-NA mailing list preferences at\n>> https://mailman.amsat.org\n>>\n>\n> -----------------------------------------------------------\n>\n> pacsat-dev mailing list -- [email protected]\n> View archives of this mailing list at\n> https://mailman.amsat.org/hyperkitty/list/[email protected]\n> To unsubscribe send an email to [email protected]\n> Manage all of your AMSAT-NA mailing list preferences at\n> https://mailman.amsat.org\n>\n\n\n",
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