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    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/TMTT25RTM7DQKSCSXQKBACGSH5MVEKFA/",
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    "message_id": "[email protected]",
    "message_id_hash": "TMTT25RTM7DQKSCSXQKBACGSH5MVEKFA",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/7MDRAEJ2SZZ542OOLXWYB7MTY6DEWXU7/",
    "sender": {
        "address": "jbrandenburg (a) amsat.org",
        "mailman_id": "fba29bb05aa944e3b759fb437017d01e",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/fba29bb05aa944e3b759fb437017d01e/emails/"
    },
    "sender_name": "Jonathan Brandenburg",
    "subject": "[pacsat-dev] Re: Latchup Protection and Watchdog Parts",
    "date": "2023-01-20T13:18:36Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/7MDRAEJ2SZZ542OOLXWYB7MTY6DEWXU7/",
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    "content": "This I didn't know! Does anybody on the list know why the hardware \nwatchdog wasn't working as expected on the RT-IHU?\n\nJonathan\n\nOn 1/19/23 17:43, Rich Gopstein wrote:\n> And - as long as I'm thinking about it, we had to disable the hardware \n> watchdog on the RT-IHU to get it to run.  I don't recall if that \n> changed, but if you get some RT-IHU boards, you might need to jumper \n> the hardware WD disable.\n>\n> Rich\n>\n>\n> On Thu, Jan 19, 2023 at 6:40 PM Rich Gopstein via pacsat-dev \n> <[email protected]> wrote:\n>\n>     Burns might remember the details (or Zach certainly would), but\n>     one of those parts was undersized for the RT-IHU and would cut out\n>     when we were transmitting with the ax5043.  I think we had to back\n>     down the xmit power 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\n>     pacsat-dev <[email protected]> wrote:\n>\n>         In last week's meeting, I noted I had been looking at the\n>         schematics for\n>         Fox-1 and RT-IHU and found the circuits for the latchup\n>         protection and\n>         watchdog functions. I admit this might be basic to some, but\n>         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\n>         and half the\n>         RT-IHU. It's obsolete, replaced by onsemi's FPF2000. But the\n>         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\n>         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\n>         RT-IHU\n>         designs to determine the thresholds of the current limit\n>         switches. In\n>         particular, I want to see if the TPS22942 is a suitable\n>         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-- \nJonathan Brandenburg\nRadio Amateur Satellite Corporation\n1-214-213-1066\n\n\n",
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