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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/7734KVMCY5JBZPAEEB5EUZ7APASCGS5B/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "7734KVMCY5JBZPAEEB5EUZ7APASCGS5B",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/7734KVMCY5JBZPAEEB5EUZ7APASCGS5B/",
    "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] Latchup Protection and Watchdog Parts",
    "date": "2023-01-19T22:46:22Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "In last week's meeting, I noted I had been looking at the schematics for \nFox-1 and RT-IHU and found the circuits for the latchup protection and \nwatchdog functions. I admit this might be basic to some, but I'm finding \nit fascinating! Anyway...\n\nSince last week's meeting, I researched the parts used:\n\nonsemi FPF2001 is a current limit switch used on both Fox-1 and half the \nRT-IHU. It's obsolete, replaced by onsemi's FPF2000. But the FPF2000 is \nlisted as end-of-life. It's replacement part is the TI TPS22942.\n\nMAX4995 is a current limit switch used on the other half of the. This \npart looks good for new designs.\n\n\nFor the watchdog functionality, both Fox-1 and RT-IHU use the \nSTWD100NYWY3F chip. this parts looks good for new designs.\n\n\nThat's as far as I got. Next, I want to research the Fox-1 and RT-IHU \ndesigns to determine the thresholds of the current limit switches. In \nparticular, I want to see if the TPS22942 is a suitable replacement, \nassuming we have the same current requirements.\n\nThat's where I'm at,\n\nJonathan\n\n\n-- \nJonathan Brandenburg\nRadio Amateur Satellite Corporation\n1-214-213-1066\n\n",
    "attachments": []
}