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    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/247GQWJW3YYLDZGSXQJ3NKYTRHUK36TB/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
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    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/247GQWJW3YYLDZGSXQJ3NKYTRHUK36TB/",
    "sender": {
        "address": "wa4cwi (a) bellsouth.net",
        "mailman_id": "4aa6f1e3f4cd4bf4b1492e47285ca527",
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    "sender_name": "Jim McCullers",
    "subject": "[pacsat-dev] Re: Pullups/Pulldowns",
    "date": "2023-11-19T15:24:42Z",
    "parent": null,
    "children": [],
    "votes": {
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    "content": "Bob,\n\n \n\nThanks.\n\n \n\nI’ll look at the 570 data sheet and see what it says about pullup resistance.\n\nAn input can be configured with either a  pullup, pulldown or nothing.\n\n \n\nWant to start a group pool to bet on how many iterations it will take to get the configuration correct?\n\nNot that difficult but easy to loose ones place going between your pin chart and the HCG settings.\n\n \n\n73,\n\n \n\nJim McCullers\n\nWA4CWI\n\n \n\n \n\n \n\nJim,\n\n \n\nYes need to be sure the pull ups are enabled on these IRQ lines which will be inputs. \n\n \n\nOk to have pull ups on all inputs. If we have a problem meeting the Vol input level we can disable later. \n\n \n\nPull-ups are probably a high resistance, maybe 100K?\n\n \n\nI have several external pull ups and a few pull downs. \n\n \n\nPOR could be a special case but we can start with pull-up. \n\n \n\nBob\n\n\n\n\n\nOn Nov 19, 2023, at 7:07 AM, Burns Fisher (AMSAT) via pacsat-dev <[email protected] <mailto:[email protected]> > wrote:\n\n \n\nYou should double check this but I seem to remember that the internal pull-up/downs only work for INPUTS. Not sure if for example they would work on i2c. FWIW\n\n \n\nOn Sat, Nov 18, 2023 at 10:41 PM Jim McCullers via pacsat-dev <[email protected] <mailto:[email protected]> > wrote:\n\nBob,\n\n \n\nIn the last column labeled Pullup/Down does “Add on chip pullup” mean set the pullup with the HCG configuration?\n\nMy assumption is yes but wanted to crosscheck before defining.\n\n \n\nThe configurator assigns a pullup to all inputs by default.\n\nIf not required I assumption they will need to be manually reset in HCG.\n\n \n\n \n\nThanks\n\n \n\nJim McCullers\n\nWA4CWI\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]\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\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",
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