electronic_eel has quit [Ping timeout: 246 seconds]
electronic_eel has joined #scopehal
<d1b2>
<david.lenfesty> Is it valid to just spec the power supplies at power-on current levels and leave it at that for a spartan 7? That's ~200mA for VCCINT/VCCBRAM and ~50mA for VCCAUX
<d1b2>
<david.lenfesty> The power estimator spreadsheet is borked on libreoffice and vivado is a ways out
<d1b2>
<david.lenfesty> although it's also pretty trivial to just spec everything for 500mA anyways
Degi_ has joined #scopehal
Degi has quit [Ping timeout: 256 seconds]
Degi_ is now known as Degi
ericonr has quit [Quit: WeeChat 3.0]
ericonr has joined #scopehal
<azonenberg>
david.lenfesty: I would use the power estimator spreadsheet. I usually just estimate the chip stuffed to the gills with some vaguely representative clock rate
<azonenberg>
it uses heavy vba macros so not surprising libreoffice cant handle it
<azonenberg>
i usually run it in a windows vm in actual office
<azonenberg>
i'll crunch some numbers for you in a bit
<d1b2>
<theorbtwo> I wonder if it is worth porting the spreadsheet to something sane, or re-charachterizing the chip and making your own equivalent. (Probably neither, to be honest.)
<azonenberg>
Having to use a windows VM once per board design isn't that catastrophic
<azonenberg>
so not exactly a priority
<azonenberg>
david.lenfesty: for the prototype, honestly, i'd say 500 mA on everything is more than adequate
<azonenberg>
on the actual board i'll run the spreadsheet and see. those rails will be likely shared by other logic
<azonenberg>
so i'll add everything up
bvernoux has joined #scopehal
<_whitenotifier>
[starshipraider] azonenberg commented on issue #3: Active Probe Control/Power Prototypes - https://git.io/JLSpB
<_whitenotifier>
[starshipraider] azonenberg edited a comment on issue #3: Active Probe Control/Power Prototypes - https://git.io/JLSpB
elms has quit [Read error: Connection reset by peer]
elms has joined #scopehal
<_whitenotifier>
[starshipraider] davidlenfesty opened pull request #4: Active Probe Host Prototype - https://git.io/JLHJu
<d1b2>
<david.lenfesty> dangit I forgot some of the USB level shifters
<azonenberg>
Let me know when it's ready for review. As far as power sequencing there shouldnt be any real requirements for 7 series, i'd just use LDOs and let them all come up at once
<azonenberg>
on the actual BLONDEL system the stm32f7 on the main control board will likely be in charge of all power sequencing and monitoring
bvernoux has quit [Read error: Connection reset by peer]