I must have sent this only to Bob.
AFAIK this chip only appears in the RT-IHU V1.1. Eric did not build the
RT-IHU so probably not. Zach might. However, he apparently knew it was
obsolete so V1.2 has a different but incompatible chip.
73,
Burns Fisher, WB1FJ
*AMSAT(R) Engineering -- Flight Software*
On Mon, Dec 11, 2023 at 1:27 PM Jim McCullers via pacsat-dev <
pacsat-dev(a)amsat.org> wrote:
> Bummer
>
> In most cases a suffix indicates a minor difference.
>
> Getting more difficult to deal with older components and variations.
> Try getting a 2N3177, used in almost every linear power supply since the
> 70s.
> No longer manufactured and stocks are limited with the expected increase in
> price.
> I have several Astron power supplies donated to our local club that need
> refreshing.
> At the moment the best source appears to be Astron, who apparently bought a
> large stock.
>
> Burns, would Eric or Zach have the MAX1556A inventory?
>
> Jim
> WA4CWI
>
>
> After looking into this more I see the MAX1556A was specified in the
> schematic and BOM. The MAX1556 was placed on the board. These two parts
> work
> differently WRT to the programming pins D1, D2.
> If the MAX1556A had been used we would have been fine.
>
> I see no stock not his part at Mouser or Digikey or Newark, or anyone in
> the
> US so far. I do see inventory in ASIA. If they will sell a small quantity
> of
> say 16 we should be able to swap out the parts. Shipping cost will be $40
> to
> $60.
>
> This part is now Obsolete at Analog Devices.
>
> I think these part was used on earlier AMSAT boards. I would like to know
> if
> there is any inventory available before ordering the parts from Asia? We
> need a minimum of 8 but I would like to have 16 to be sure we get them
> soldered on the boards.
>
> Bob
>
>
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Bummer
In most cases a suffix indicates a minor difference.
Getting more difficult to deal with older components and variations.
Try getting a 2N3177, used in almost every linear power supply since the
70s.
No longer manufactured and stocks are limited with the expected increase in
price.
I have several Astron power supplies donated to our local club that need
refreshing.
At the moment the best source appears to be Astron, who apparently bought a
large stock.
Burns, would Eric or Zach have the MAX1556A inventory?
Jim
WA4CWI
After looking into this more I see the MAX1556A was specified in the
schematic and BOM. The MAX1556 was placed on the board. These two parts work
differently WRT to the programming pins D1, D2.
If the MAX1556A had been used we would have been fine.
I see no stock not his part at Mouser or Digikey or Newark, or anyone in the
US so far. I do see inventory in ASIA. If they will sell a small quantity of
say 16 we should be able to swap out the parts. Shipping cost will be $40 to
$60.
This part is now Obsolete at Analog Devices.
I think these part was used on earlier AMSAT boards. I would like to know if
there is any inventory available before ordering the parts from Asia? We
need a minimum of 8 but I would like to have 16 to be sure we get them
soldered on the boards.
Bob
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UPS tells me that the package from Newark will arrive tomorrow. Zach,
perhaps it is now safe to send me two of those connectors for the debug
board.
Thanks!
73,
Burns Fisher, WB1FJ
*AMSAT(R) Engineering -- Flight Software*
Yep, they are on the RTIHU. Zach would be the one who might have spare
parts. BTW, did you check Arrow Electronics? Analog Devices says they
have an agreement with Arrow to stock obsolete parts.
73,
Burns Fisher, WB1FJ
*AMSAT(R) Engineering -- Flight Software*
On Sun, Dec 10, 2023 at 4:32 PM Bob Stricklin via pacsat-dev <
pacsat-dev(a)amsat.org> wrote:
> After looking into this more I see the MAX1556A was specified in the
> schematic and BOM. The MAX1556 was placed on the board. These two parts
> work differently WRT to the programming pins D1, D2.
> If the MAX1556A had been used we would have been fine.
>
> I see no stock not his part at Mouser or Digikey or Newark, or anyone in
> the US so far. I do see inventory in ASIA. If they will sell a small
> quantity of say 16 we should be able to swap out the parts. Shipping cost
> will be $40 to $60.
>
> This part is now Obsolete at Analog Devices.
>
> I think these part was used on earlier AMSAT boards. I would like to know
> if there is any inventory available before ordering the parts from Asia?
> We need a minimum of 8 but I would like to have 16 to be sure we get them
> soldered on the boards.
>
> Bob
>
>
> -----------------------------------------------------------
>
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> 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
>
After looking into this more I see the MAX1556A was specified in the schematic and BOM. The MAX1556 was placed on the board. These two parts work differently WRT to the programming pins D1, D2.
If the MAX1556A had been used we would have been fine.
I see no stock not his part at Mouser or Digikey or Newark, or anyone in the US so far. I do see inventory in ASIA. If they will sell a small quantity of say 16 we should be able to swap out the parts. Shipping cost will be $40 to $60.
This part is now Obsolete at Analog Devices.
I think these part was used on earlier AMSAT boards. I would like to know if there is any inventory available before ordering the parts from Asia? We need a minimum of 8 but I would like to have 16 to be sure we get them soldered on the boards.
Bob
Does it appear the board survived the slight over voltage or is it too early to tell?
I don't believe I have a 6.8k or 24k in those sizes.
Jim
WA4CWI
While reviewing things today I realized i had the Watchdog timer enabled for protection until things are working. However we have a watchdog that turns on at power up and stayed active for about 1.2 seconds. After 1.2 seconds it turns the general power to the board off. I am doing my testing by slowly increasing the power supply current which means the voltage comes up slowly.
The 1.8 volt supply has never been turned on so far.
When Power and clocks are stable we will disable the watchdog until code is running in CPU at power up.
Something to think about later, A watchdog normally resets a processor. In this case i have one watchdog turning off the distributed power to the board. We may need a power cycle to restart the watchdog process. If we are a host on a larger platform we do have a method to cycle power. If we do not want to rely on intervention we may need to change things in this design.
I needed a 6.8K resistor and a 24K resistor to recondition the 3.3 volt regulator. I purchased 100 6.8K resistors a year ago but can’t find them. Kent WA5VJB will bring me the resistors to the NTMS meeting tomorrow so I can keep moving forward.
Bob
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While reviewing things today I realized i had the Watchdog timer enabled for protection until things are working. However we have a watchdog that turns on at power up and stayed active for about 1.2 seconds. After 1.2 seconds it turns the general power to the board off. I am doing my testing by slowly increasing the power supply current which means the voltage comes up slowly.
The 1.8 volt supply has never been turned on so far.
When Power and clocks are stable we will disable the watchdog until code is running in CPU at power up.
Something to think about later, A watchdog normally resets a processor. In this case i have one watchdog turning off the distributed power to the board. We may need a power cycle to restart the watchdog process. If we are a host on a larger platform we do have a method to cycle power. If we do not want to rely on intervention we may need to change things in this design.
I needed a 6.8K resistor and a 24K resistor to recondition the 3.3 volt regulator. I purchased 100 6.8K resistors a year ago but can’t find them. Kent WA5VJB will bring me the resistors to the NTMS meeting tomorrow so I can keep moving forward.
Bob
The connector placed on the PCB is Samtec FTSH-105-01-L-DV-K Its a .050” pitch 2X5 connector.
This part number is on the schematic CPU page top left.
I purchased a ribbon cable from Mouser and raced it today. This cable will work with the PCB connector.
Mouser # 200-FFSD05D08.0001N
The connector on the TI programming board and likely the lower cost programming board have a different arrangement. My solution is to purchase ribbon cables for both types and cut and splice them together properly.
Bob
The last thing I ordered from Newark was also shipped from the UK with no shipping communications and as I recall took a long time.
It was also an obsolete component by DigiKey and Mouser.
Keep us posted.
Jim
Ok, Bob. The picture sure looks like there are "holes" there, but you never know. I do think that I asked Zach to put the connector on the bottom so it would line the ribbon cable up correctly with the RTIHU connector. We'll find out. BTW, Newark says they are sending the board from the UK. Hmm.
73,
Burns Fisher, WB1FJ
AMSAT(R) Engineering -- Flight Software
On Fri, Dec 8, 2023 at 11:00 AM Bob Stricklin via pacsat-dev <pacsat-dev(a)amsat.org <mailto:[email protected]> > wrote:
Burns,
I believe he is talking about a 10 pin connector on the bottom left corner of the photo that is turned down below the board.
He probably did this to make a standard ribbon cable work with female IDC connectors on each end.
We can make that change if the boards are shipped.
It may be that Newark inventory is there because they do not got so much business on TI product. Normally when an OEM drops a product they pull all the distributor inventory back. These may be a third party board which is fine if they have the same processor and code.
It will be interesting to see if the TI ARM processor TM4C1294NCPDTT3R is on these boards. If it is and several people working on AMSAT projects need these boards we probably should buy more.
The info I have is the design information I showed last night that Zach shared with me on an AMSAT version of this programming interface board.
Bob
On Dec 8, 2023, at 9:41 AM, Burns Fisher (AMSAT) via pacsat-dev <pacsat-dev(a)amsat.org <mailto:[email protected]> > wrote:
Thanks, Zach. That might mean that what I ordered is different. See in the picture, the place where you added the connector is not populated. (You have to hover over it to get the expanded version in order to see it).
https://www.newark.com/texas-instruments/cc-devpack-debug/debugger-devpak-s…
Well see what happens. Actually do you have a couple of male connectors that you could send me? That way, I could easily add it in and test the new board (assuming it comes...maybe you'd better wait until I get a shipping number :-) )
73,
Burns Fisher, WB1FJ
AMSAT(R) Engineering -- Flight Software
On Fri, Dec 8, 2023 at 10:32 AM Zach Metzinger <zmetzing(a)pobox.com <mailto:[email protected]> > wrote:
On 12/8/23 08:07, Burns Fisher (AMSAT) wrote:
> Note to Pacsat folks: It appears (and Zach can confirm) that Zach must
> have just ADDED a connector into a DNP space on the board...this is
> based on the pictures.
Hello Burns and the Pacsat team,
This is not correct; I replace the female 2x5 connector with a male 2x5
shrouded/keyed connector. Instructions, already sent to Bob Strickland,
attached.
73,
--- Zach
N0ZGO
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