January 2023 - pacsat-dev - mailman.amsat.org

Re: Latchup Protection and Watchdog Parts
by Bob Stricklin 20 Jan '23

20 Jan '23

Jonathan, Attached is an Excel file I have worked on for PacSat power needs. Bob On Jan 20, 2023, at 7:17 AM, Jonathan Brandenburg via pacsat-dev <pacsat-dev(a)amsat.org<mailto:[email protected]>> wrote: I 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? Jonathan On 1/19/23 17:40, Rich Gopstein via pacsat-dev wrote: Burns 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. Rich On Thu, Jan 19, 2023 at 5:46 PM Jonathan Brandenburg via pacsat-dev <pacsat-dev(a)amsat.org<mailto:[email protected]>> wrote: In last week's meeting, I noted I had been looking at the schematics for Fox-1 and RT-IHU and found the circuits for the latchup protection and watchdog functions. I admit this might be basic to some, but I'm finding it fascinating! Anyway... Since last week's meeting, I researched the parts used: onsemi FPF2001 is a current limit switch used on both Fox-1 and half the RT-IHU. It's obsolete, replaced by onsemi's FPF2000. But the FPF2000 is listed as end-of-life. It's replacement part is the TI TPS22942. MAX4995 is a current limit switch used on the other half of the. This part looks good for new designs. For the watchdog functionality, both Fox-1 and RT-IHU use the STWD100NYWY3F chip. this parts looks good for new designs. That's as far as I got. Next, I want to research the Fox-1 and RT-IHU designs to determine the thresholds of the current limit switches. In particular, I want to see if the TPS22942 is a suitable replacement, assuming we have the same current requirements. That's where I'm at, Jonathan -- Jonathan Brandenburg Radio Amateur Satellite Corporation 1-214-213-1066 ----------------------------------------------------------- pacsat-dev mailing list -- pacsat-dev(a)amsat.org<mailto:[email protected]> View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/[email protected]<https://url.emailprotection.link/?buUg7YY4HZLXKo6ZKNudC8bRTBdOsBlAV5C9rq-aq…> To unsubscribe send an email to pacsat-dev-leave(a)amsat.org<mailto:[email protected]> Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org<https://url.emailprotection.link/?bO71JCUf8Kb7txAlIoAarNqcIdQhyb8VQQIN4j0Gi…> ----------------------------------------------------------- pacsat-dev mailing list -- pacsat-dev(a)amsat.org<mailto:[email protected]> View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/[email protected]<https://url.emailprotection.link/?buUg7YY4HZLXKo6ZKNudC8bRTBdOsBlAV5C9rq-aq…> To unsubscribe send an email to pacsat-dev-leave(a)amsat.org<mailto:[email protected]> Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org<https://url.emailprotection.link/?bO71JCUf8Kb7txAlIoAarNqcIdQhyb8VQQIN4j0Gi…> -- Jonathan Brandenburg Radio Amateur Satellite Corporation 1-214-213-1066 ----------------------------------------------------------- pacsat-dev mailing list -- pacsat-dev(a)amsat.org<mailto:[email protected]> View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/[email protected] To unsubscribe send an email to pacsat-dev-leave(a)amsat.org<mailto:[email protected]> Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org

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Re: Latchup Protection and Watchdog Parts
by Rich Gopstein 20 Jan '23

20 Jan '23

And - as long as I'm thinking about it, we had to disable the hardware watchdog on the RT-IHU to get it to run. I don't recall if that changed, but if you get some RT-IHU boards, you might need to jumper the hardware WD disable. Rich On Thu, Jan 19, 2023 at 6:40 PM Rich Gopstein via pacsat-dev < pacsat-dev(a)amsat.org> wrote: > Burns 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. > > Rich > > > On Thu, Jan 19, 2023 at 5:46 PM Jonathan Brandenburg via pacsat-dev < > pacsat-dev(a)amsat.org> wrote: > >> In last week's meeting, I noted I had been looking at the schematics for >> Fox-1 and RT-IHU and found the circuits for the latchup protection and >> watchdog functions. I admit this might be basic to some, but I'm finding >> it fascinating! Anyway... >> >> Since last week's meeting, I researched the parts used: >> >> onsemi FPF2001 is a current limit switch used on both Fox-1 and half the >> RT-IHU. It's obsolete, replaced by onsemi's FPF2000. But the FPF2000 is >> listed as end-of-life. It's replacement part is the TI TPS22942. >> >> MAX4995 is a current limit switch used on the other half of the. This >> part looks good for new designs. >> >> >> For the watchdog functionality, both Fox-1 and RT-IHU use the >> STWD100NYWY3F chip. this parts looks good for new designs. >> >> >> That's as far as I got. Next, I want to research the Fox-1 and RT-IHU >> designs to determine the thresholds of the current limit switches. In >> particular, I want to see if the TPS22942 is a suitable replacement, >> assuming we have the same current requirements. >> >> That's where I'm at, >> >> Jonathan >> >> >> -- >> Jonathan Brandenburg >> Radio Amateur Satellite Corporation >> 1-214-213-1066 >> >> >> ----------------------------------------------------------- >> >> pacsat-dev mailing list -- pacsat-dev(a)amsat.org >> View archives of this mailing list at >> https://mailman.amsat.org/hyperkitty/list/[email protected] >> To unsubscribe send an email to pacsat-dev-leave(a)amsat.org >> Manage all of your AMSAT-NA mailing list preferences at >> https://mailman.amsat.org >> > > ----------------------------------------------------------- > > pacsat-dev mailing list -- pacsat-dev(a)amsat.org > View archives of this mailing list at > https://mailman.amsat.org/hyperkitty/list/[email protected] > To unsubscribe send an email to pacsat-dev-leave(a)amsat.org > Manage all of your AMSAT-NA mailing list preferences at > https://mailman.amsat.org >

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Re: Latchup Protection and Watchdog Parts
by Jonathan Brandenburg 20 Jan '23

20 Jan '23

I 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? Jonathan On 1/19/23 17:40, Rich Gopstein via pacsat-dev wrote: > Burns 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. > > Rich > > > On Thu, Jan 19, 2023 at 5:46 PM Jonathan Brandenburg via pacsat-dev > <pacsat-dev(a)amsat.org> wrote: > > In last week's meeting, I noted I had been looking at the > schematics for > Fox-1 and RT-IHU and found the circuits for the latchup protection > and > watchdog functions. I admit this might be basic to some, but I'm > finding > it fascinating! Anyway... > > Since last week's meeting, I researched the parts used: > > onsemi FPF2001 is a current limit switch used on both Fox-1 and > half the > RT-IHU. It's obsolete, replaced by onsemi's FPF2000. But the > FPF2000 is > listed as end-of-life. It's replacement part is the TI TPS22942. > > MAX4995 is a current limit switch used on the other half of the. This > part looks good for new designs. > > > For the watchdog functionality, both Fox-1 and RT-IHU use the > STWD100NYWY3F chip. this parts looks good for new designs. > > > That's as far as I got. Next, I want to research the Fox-1 and RT-IHU > designs to determine the thresholds of the current limit switches. In > particular, I want to see if the TPS22942 is a suitable replacement, > assuming we have the same current requirements. > > That's where I'm at, > > Jonathan > > > -- > Jonathan Brandenburg > Radio Amateur Satellite Corporation > 1-214-213-1066 > > > ----------------------------------------------------------- > > pacsat-dev mailing list -- pacsat-dev(a)amsat.org > View archives of this mailing list at > https://mailman.amsat.org/hyperkitty/list/[email protected] > To unsubscribe send an email to pacsat-dev-leave(a)amsat.org > Manage all of your AMSAT-NA mailing list preferences at > https://mailman.amsat.org > > > ----------------------------------------------------------- > > pacsat-dev mailing list --pacsat-dev(a)amsat.org > View archives of this mailing list athttps://mailman.amsat.org/hyperkitty/list/[email protected] > To unsubscribe send an email topacsat-dev-leave(a)amsat.org > Manage all of your AMSAT-NA mailing list preferences athttps://mailman.amsat.org -- Jonathan Brandenburg Radio Amateur Satellite Corporation 1-214-213-1066

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Re: Latchup Protection and Watchdog Parts
by Rich Gopstein 19 Jan '23

19 Jan '23

Burns 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. Rich On Thu, Jan 19, 2023 at 5:46 PM Jonathan Brandenburg via pacsat-dev < pacsat-dev(a)amsat.org> wrote: > In last week's meeting, I noted I had been looking at the schematics for > Fox-1 and RT-IHU and found the circuits for the latchup protection and > watchdog functions. I admit this might be basic to some, but I'm finding > it fascinating! Anyway... > > Since last week's meeting, I researched the parts used: > > onsemi FPF2001 is a current limit switch used on both Fox-1 and half the > RT-IHU. It's obsolete, replaced by onsemi's FPF2000. But the FPF2000 is > listed as end-of-life. It's replacement part is the TI TPS22942. > > MAX4995 is a current limit switch used on the other half of the. This > part looks good for new designs. > > > For the watchdog functionality, both Fox-1 and RT-IHU use the > STWD100NYWY3F chip. this parts looks good for new designs. > > > That's as far as I got. Next, I want to research the Fox-1 and RT-IHU > designs to determine the thresholds of the current limit switches. In > particular, I want to see if the TPS22942 is a suitable replacement, > assuming we have the same current requirements. > > That's where I'm at, > > Jonathan > > > -- > Jonathan Brandenburg > Radio Amateur Satellite Corporation > 1-214-213-1066 > > > ----------------------------------------------------------- > > pacsat-dev mailing list -- pacsat-dev(a)amsat.org > View archives of this mailing list at > https://mailman.amsat.org/hyperkitty/list/[email protected] > To unsubscribe send an email to pacsat-dev-leave(a)amsat.org > Manage all of your AMSAT-NA mailing list preferences at > https://mailman.amsat.org >

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Latchup Protection and Watchdog Parts
by Jonathan Brandenburg 19 Jan '23

19 Jan '23

In last week's meeting, I noted I had been looking at the schematics for Fox-1 and RT-IHU and found the circuits for the latchup protection and watchdog functions. I admit this might be basic to some, but I'm finding it fascinating! Anyway... Since last week's meeting, I researched the parts used: onsemi FPF2001 is a current limit switch used on both Fox-1 and half the RT-IHU. It's obsolete, replaced by onsemi's FPF2000. But the FPF2000 is listed as end-of-life. It's replacement part is the TI TPS22942. MAX4995 is a current limit switch used on the other half of the. This part looks good for new designs. For the watchdog functionality, both Fox-1 and RT-IHU use the STWD100NYWY3F chip. this parts looks good for new designs. That's as far as I got. Next, I want to research the Fox-1 and RT-IHU designs to determine the thresholds of the current limit switches. In particular, I want to see if the TPS22942 is a suitable replacement, assuming we have the same current requirements. That's where I'm at, Jonathan -- Jonathan Brandenburg Radio Amateur Satellite Corporation 1-214-213-1066

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Re: Pacsat dev meeting 1-19-2023
by Jonathan Brandenburg 19 Jan '23

19 Jan '23

I'm afraid I won't make this evening's meeting... I'm out of town for almost two entire weeks with only a few hours at home and if I want to stay married, I won't get on any meetings tonight! I'll send a separate email with a brief update. Jonathan On 1/19/23 12:06, Bill via pacsat-dev wrote: > Pacsat dev meeting 1-19-2023 > Thu, Jan 19, 2023 7:00 PM - 9:00 PM (CST) > > Please join my meeting from your computer, tablet or smartphone. > > https://meet.goto.com/210641357 > > You can also dial in using your phone. > (For supported devices, tap a one-touch number below to join instantly.) > > United States: +1 (224) 501-3412 > - One-touch: tel:+12245013412,,210641357# > > Access Code: 210-641-357 > > > Get the app now and be ready when your first meeting starts: > https://meet.goto.com/install > > > > ----------------------------------------------------------- > > pacsat-dev mailing list -- pacsat-dev(a)amsat.org > View archives of this mailing list at > https://mailman.amsat.org/hyperkitty/list/[email protected] > To unsubscribe send an email to pacsat-dev-leave(a)amsat.org > Manage all of your AMSAT-NA mailing list preferences at > https://mailman.amsat.org -- Jonathan Brandenburg Radio Amateur Satellite Corporation 1-214-213-1066

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Re: AX5043 Booster Board
by Burns Fisher (AMSAT) 19 Jan '23

19 Jan '23

Oh totally understand and agree about only 2 Ax5043. I was just thinking this would be an opportunity also to test hardware and software for using both RF pins on the chip, but you are the hardware designer, not me. 😀 On Fri, Jan 20, 2023 at 3:54 AM Jim McCullers via pacsat-dev < pacsat-dev(a)amsat.org> wrote: > Burns, > > > > My thinking is this is a generalized starter board for all groups, simple > but inclusive. > > We have a long way to go to have the actual RF requirements for the > receivers and transmitter and can do a lot with this configuration. > > In addition I don’t believe we have pin availability on the LaunchPad for > chip select and interrupt lines for three additional AX5043s. > > We may be forced into more of a prototype flight board to test the full RF > stack. That’s another topic for discussion. > > > > As a note to all, component values given in the schematic are preliminary > and essentially placeholders to get the basic schematic and board layout > completed. > > > > 73 > > > > Jim McCullers > > WA4CWI > > > > > > > > If fligHt version has multi receivers anD one tx we reall y wants to be > ab.le to be flexible with which device does what. Which means using one of > the rf pins for tx and one for rx and matched to appropriate band. And we > want to be test that setup on the current launchpad card tHa Jim is making. > My thought from a distance! > > *light Software* > > ----------------------------------------------------------- > > pacsat-dev mailing list -- pacsat-dev(a)amsat.org > View archives of this mailing list at > https://mailman.amsat.org/hyperkitty/list/[email protected] > To unsubscribe send an email to pacsat-dev-leave(a)amsat.org > Manage all of your AMSAT-NA mailing list preferences at > https://mailman.amsat.org > -- 73, Burns Fisher, WB1FJ *AMSAT(R) Engineering -- Flight Software*

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Pacsat dev meeting 1-19-2023
by Bill 19 Jan '23

19 Jan '23

Pacsat dev meeting 1-19-2023 Thu, Jan 19, 2023 7:00 PM - 9:00 PM (CST) Please join my meeting from your computer, tablet or smartphone. https://meet.goto.com/210641357 You can also dial in using your phone. (For supported devices, tap a one-touch number below to join instantly.) United States: +1 (224) 501-3412 - One-touch: tel:+12245013412,,210641357# Access Code: 210-641-357 Get the app now and be ready when your first meeting starts: https://meet.goto.com/install

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Re: AX5043 Booster Board
by Burns Fisher (AMSAT) 19 Jan '23

19 Jan '23

If fligHt version has multi receivers anD one tx we reall y wants to be ab.le to be flexible with which device does what. Which means using one of the rf pins for tx and one for rx and matched to appropriate band. And we want to be test that setup on the current launchpad card tHa Jim is making. My thought from a distance! On Thu, Jan 19, 2023 at 3:47 PM Jim McCullers via pacsat-dev < pacsat-dev(a)amsat.org> wrote: > The values on the schematic should be at the moment considered placeholder > values. > > I still need to go through the schematic and insert the correct values for > both AX5043s. > > Rich you are correct, the matching network is unique and tuned for each > band. > > The plan is to work on the VHF network using one of the Raspberry Pi > boards I’m building then transfer those to the schematic. > > As VHF is uplink it will require fine tuning for optimum performance. > > > > The MRAMs show pullups on the chip selects which may not be needed as well > as load resistors on the MISO leads that Kicad balks about when paralleling > outputs. > > Need to do more research but zero ohm resistors are less expensive than > new boards and a lot less time consuming than trace surgery. > > > > In a flight version the matching network on the UHF is not required unless > a need arises for 70cm receiver optimum. > > I actually laid out the VHF schematic then duplicated it for the UHF and > never deleted the inductor which for UHF is a zero ohm resistor > > > > Jim McCullers > > WA4CWI > > > > BTW - the external 90nH inductor isn't needed for the UHF chip. No harm > in leaving it in, though. > > > > On Wed, Jan 18, 2023 at 4:07 PM Jim McCullers via pacsat-dev < > pacsat-dev(a)amsat.org> wrote: > > Attached are the schematic and layout for the TMS-570 LaunchPad booster > board. > > > > It contains two AX5043 circuits configurable for VHF or UHF and places for > four MRAMs. > > Not all positions are required to be present so the build can be by need. > > It does contain the resistors I discussed that may not be required in > future versions. > > > > Please give it a review as I’m preparing to send the design to the PCB > board maker for a first trial run. > > > > 73 > > > > Jim McCullers > > WA4CWI > > > ----------------------------------------------------------- > > pacsat-dev mailing list -- pacsat-dev(a)amsat.org > View archives of this mailing list at > https://mailman.amsat.org/hyperkitty/list/[email protected] > To unsubscribe send an email to pacsat-dev-leave(a)amsat.org > Manage all of your AMSAT-NA mailing list preferences at > https://mailman.amsat.org > > > ----------------------------------------------------------- > > pacsat-dev mailing list -- pacsat-dev(a)amsat.org > View archives of this mailing list at > https://mailman.amsat.org/hyperkitty/list/[email protected] > To unsubscribe send an email to pacsat-dev-leave(a)amsat.org > Manage all of your AMSAT-NA mailing list preferences at > https://mailman.amsat.org > -- 73, Burns Fisher, WB1FJ *AMSAT(R) Engineering -- Flight Software*

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Re: AX5043 Booster Board
by Rich Gopstein 19 Jan '23

19 Jan '23

BTW - the external 90nH inductor isn't needed for the UHF chip. No harm in leaving it in, though. On Wed, Jan 18, 2023 at 4:07 PM Jim McCullers via pacsat-dev < pacsat-dev(a)amsat.org> wrote: > Attached are the schematic and layout for the TMS-570 LaunchPad booster > board. > > > > It contains two AX5043 circuits configurable for VHF or UHF and places for > four MRAMs. > > Not all positions are required to be present so the build can be by need. > > It does contain the resistors I discussed that may not be required in > future versions. > > > > Please give it a review as I’m preparing to send the design to the PCB > board maker for a first trial run. > > > > 73 > > > > Jim McCullers > > WA4CWI > > ----------------------------------------------------------- > > pacsat-dev mailing list -- pacsat-dev(a)amsat.org > View archives of this mailing list at > https://mailman.amsat.org/hyperkitty/list/[email protected] > To unsubscribe send an email to pacsat-dev-leave(a)amsat.org > Manage all of your AMSAT-NA mailing list preferences at > https://mailman.amsat.org >

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