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{ "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/EPZ6SZOMYSZ7CAMHSC4Q6NNIO6SGVX2K/?format=api", "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api", "message_id": "[email protected]", "message_id_hash": "EPZ6SZOMYSZ7CAMHSC4Q6NNIO6SGVX2K", "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/EPZ6SZOMYSZ7CAMHSC4Q6NNIO6SGVX2K/?format=api", "sender": { "address": "bstrick (a) N5BRG.COM", "mailman_id": "953542c988dd4c549175bb02a8a6a1ed", "emails": "https://mailman.amsat.org/hyperkitty/api/sender/953542c988dd4c549175bb02a8a6a1ed/emails/?format=api" }, "sender_name": "Bob Stricklin", "subject": "[pacsat-dev] Re: Latchup Protection and Watchdog Parts", "date": "2023-01-20T13:25:48Z", "parent": null, "children": [], "votes": { "likes": 0, "dislikes": 0, "status": "neutral" }, "content": "Jonathan,\n\nAttached is an Excel file I have worked on for PacSat power needs.\n\nBob\n\n\n\nOn Jan 20, 2023, at 7:17 AM, Jonathan Brandenburg via pacsat-dev <[email protected]<mailto:[email protected]>> wrote:\n\n\nI seem to remember that, too. As such, we may need to look at other parts or different versions of the same parts. That depends, obviously on the maximum current draw expected during normal operation. Does anybody 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:\nBurns might remember the details (or Zach certainly would), but one of those parts was undersized for the RT-IHU and would cut out when we were transmitting with the ax5043. I think we had to back down the xmit power in 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]<mailto:[email protected]>> wrote:\nIn 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\n-----------------------------------------------------------\n\npacsat-dev mailing list -- [email protected]<mailto:[email protected]>\nView archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/[email protected]<https://url.emailprotection.link/?buUg7YY4HZLXKo6ZKNudC8bRTBdOsBlAV5C9rq-aqxOQfa9Eqh8kfGK8xAPNkaYeV4y3Z5HVIEvNBaAimp_ZfFMwcw8QT0XZxGj2iXsHa3mcBRxu810JiHLaLtHS4Ej_7>\nTo unsubscribe send an email to [email protected]<mailto:[email protected]>\nManage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org<https://url.emailprotection.link/?bO71JCUf8Kb7txAlIoAarNqcIdQhyb8VQQIN4j0Gik24jnwI-Byk6ZVn92BYiD7Bxz61XZBoNoJE1TKqdfKnwFw~~>\n\n\n\n-----------------------------------------------------------\n\npacsat-dev mailing list -- [email protected]<mailto:[email protected]>\nView archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/[email protected]<https://url.emailprotection.link/?buUg7YY4HZLXKo6ZKNudC8bRTBdOsBlAV5C9rq-aqxOQfa9Eqh8kfGK8xAPNkaYeV4y3Z5HVIEvNBaAimp_ZfFMwcw8QT0XZxGj2iXsHa3mcBRxu810JiHLaLtHS4Ej_7>\nTo unsubscribe send an email to [email protected]<mailto:[email protected]>\nManage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org<https://url.emailprotection.link/?bO71JCUf8Kb7txAlIoAarNqcIdQhyb8VQQIN4j0Gik24jnwI-Byk6ZVn92BYiD7Bxz61XZBoNoJE1TKqdfKnwFw~~>\n\n\n--\nJonathan Brandenburg\nRadio Amateur Satellite Corporation\n1-214-213-1066\n\n-----------------------------------------------------------\n\npacsat-dev mailing list -- [email protected]<mailto:[email protected]>\nView archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/[email protected]\nTo unsubscribe send an email to [email protected]<mailto:[email protected]>\nManage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org\n\n\n\n", "attachments": [ { "email": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/EPZ6SZOMYSZ7CAMHSC4Q6NNIO6SGVX2K/?format=api", "counter": 3, "name": "attachment.html", "content_type": "text/html", "encoding": "us-ascii", "size": 6684, "download": "https://mailman.amsat.org/hyperkitty/list/[email protected]/message/EPZ6SZOMYSZ7CAMHSC4Q6NNIO6SGVX2K/attachment/3/attachment.html" }, { "email": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/EPZ6SZOMYSZ7CAMHSC4Q6NNIO6SGVX2K/?format=api", "counter": 4, "name": "PacSATCurrentSummary.xlsx", "content_type": "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", "encoding": null, "size": 11081, "download": "https://mailman.amsat.org/hyperkitty/list/[email protected]/message/EPZ6SZOMYSZ7CAMHSC4Q6NNIO6SGVX2K/attachment/4/PacSATCurrentSummary.xlsx" } ] }