Jonathan,
The key part number is the one I have given you. This defines the 144 pin package and the definition of each pin.
The QQ! on the end are:
1st Q - Temp range -40 to 125C Q1 - Automotive grade
There can be a R on the end also which would bean tape and reel. No R would mead a flat pack. We could use either one.
For prototype builds we could use other grades. For flight hardware we would like to have the best grade. Since a lot of TI volume is in automotive that grade which is probably the best we would want to pay for is not so expensive unless the price starts ratcheting up due to shortages.
Bob
On May 3, 2023, at 9:27 PM, Jonathan Brandenburg via pacsat-dev pacsat-dev@amsat.org wrote:
I should point out the BoM I have is from the most recent board assembly but it was emailed directly from Zach so I don't know if it was posted to Subversion. (It is now as Cameron has been tracking down the latest schematics and layouts for the RT-IHU and has ensured they're posted to Subversion.)
Bob, you're listing a slightly different part number... Is that significant? Could that have been from a previous BoM? This is confusing to me :(
Jonathan
On 5/3/2023 9:23 PM, Jonathan Brandenburg via pacsat-dev wrote:
The RT-IHU BoM is showing TMS5700914APGEQQ1 for the complete part number... There is a good chance Zach Metzinger has a small supply of those but it's not clear to me how those are allocated. Perhaps reaching out to Zach is appropriate, especially for the initial boards.
Thoughts?
Jonathan
On 5/3/2023 9:18 PM, Bob Stricklin via pacsat-dev wrote:
Jonathan,
The chip number I am working with is:
TMS570LS0914PGE
This is the same part used on other AMSAT designs. I had looked into ordering a few also and noticed the long lead-time. I would like to have two or three of these myself.
There is a possibility someone else has a few left over from earlier builds.
I would not be surprised to see the delivery keep getting pushed out. If China invades Taiwan we may never see them again. I don’t think a lot of Americans realize the impact this will have.
Bob
On May 3, 2023, at 5:16 PM, Jonathan Brandenburg via pacsat-dev pacsat-dev@amsat.org wrote:
Howdy!
Which TMS570 are you currently planning to use on the PACSAT board? I ask because I'd like to get an order in as stock is still sporadic.
In particular, the RT-IHU uses the TMS5700914APGEQQ1, which I have ordered from Mouser but delivery is currently scheduled for Jan 2024. Digikey lists Nov 2023 for delivery at this time.
The Launchpad uses a TMS570LS1224 device with one part, TMS5701224CPGEQQ1 showing a July 2023 delivery from Mouser and Digikey showing January 2024.
I have admittedly done no research on the capabilities offered by these parts but I'm happy to order when we know what PACSAT will fly.
Jonathan
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