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    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/67TZLD26SIK3EKSBH6UP5PZ25XY7WKVS/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "67TZLD26SIK3EKSBH6UP5PZ25XY7WKVS",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/67TZLD26SIK3EKSBH6UP5PZ25XY7WKVS/",
    "sender": {
        "address": "jbrandenburg (a) amsat.org",
        "mailman_id": "fba29bb05aa944e3b759fb437017d01e",
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    "sender_name": "Jonathan Brandenburg",
    "subject": "[pacsat-dev] Re: Latchup Protection and Watchdog Parts",
    "date": "2023-01-20T13:17:39Z",
    "parent": null,
    "children": [],
    "votes": {
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    "content": "I seem to remember that, too. As such, we may need to look at other \nparts or different versions of the same parts. That depends, obviously \non the maximum current draw expected during normal operation. Does \nanybody on this list know if we have that information for the AX5043 chain?\n\nJonathan\n\nOn 1/19/23 17:40, Rich Gopstein via pacsat-dev wrote:\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 \n> were transmitting with the ax5043.  I think we had to back down the \n> 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 pacsat-dev \n> <[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 protection\n>     and\n>     watchdog functions. I admit this might be basic to some, but I'm\n>     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\n>     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 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 athttps://mailman.amsat.org/hyperkitty/list/[email protected]\n> To unsubscribe send an email [email protected]\n> Manage all of your AMSAT-NA mailing list preferences athttps://mailman.amsat.org\n\n-- \nJonathan Brandenburg\nRadio Amateur Satellite Corporation\n1-214-213-1066\n\n\n",
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