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    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/YT7HLGP5UFAUUOJCWXUBG2XJG5MFKFAA/",
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    "message_id": "CANsNeapSa9ATP_K-E8Hy4Dx14CPT0jN3mim=6edk+koexZHW4w@mail.gmail.com",
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    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/YT7HLGP5UFAUUOJCWXUBG2XJG5MFKFAA/",
    "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": "2023-01-19T23:40:25Z",
    "parent": null,
    "children": [],
    "votes": {
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    "content": "Burns might remember the details (or Zach certainly would), but one of\nthose parts was undersized for the RT-IHU and would cut out when we were\ntransmitting with the ax5043.  I think we had to back down the xmit power\nin order for the device not to reset.\n\nRich\n\n\nOn Thu, Jan 19, 2023 at 5:46 PM Jonathan Brandenburg via pacsat-dev <\[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",
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