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ucbus-psu-breakout
Commit c1c3b72d authored by Jake Read's avatar Jake Read
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hello psu breakout

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.gitignore 0 → 100644
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jake/
**.elf
**.hex
**.bin
**.lss
**.map
**.srec
**.o
**.d
**.DS_Store
**.b#*
**.s#*
**.l#*
**.atsuo
**/ASF/
\ No newline at end of file
2020-08_psu-breakout/2020-08_psu-breakout.brd 0 → 100644
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2020-08_psu-breakout/2020-08_psu-breakout.sch 0 → 100644
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2020-08_psu-breakout/eagle.epf 0 → 100644
View file @ c1c3b72d
[Eagle]
Version="09 06 02"
Platform="Windows"
Globals="Globals"
Desktop="Desktop"
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WireBendSet=0
WireCap=1
MiterStyle=1
PadShape=0
ViaShape=1
PolygonPour=0
PolygonRank=2
PolygonThermals=1
PolygonOrphans=0
TextRatio=8
DimensionUnit=1
DimensionPrecision=2
DimensionShowUnit=0
PinDirection=3
PinFunction=0
PinLength=2
PinVisible=3
SwapLevel=0
ArcDirection=0
AddLevel=2
PadsSameType=0
Layer=47
[Win_4]
Type="Control Panel"
Number=0
[Desktop]
Screen="2560 1440"
Window="Win_1"
Window="Win_2"
Window="Win_3"
Window="Win_4"
README.md 0 → 100644
View file @ c1c3b72d
## PSU Baseboard / Bus Head
This is a circuit & mount for a small desktop DC PSU and embedded system bus-head. Documentation is sparse.
![routed](log/2020-08-03_routed.png)
![schem](log/2020-08-03_schematic.png)
### What's Up:
- uses [the module](https://gitlab.cba.mit.edu/jakeread/ucbus-module)
- breaks out 24V 350W & UCBus on one 2x15 IDC
- second 24V 40W UCBus channel available
- RPI mount available
- RPI UART lines plumbed
- 5V 2A regulator footprint to power RPI from 24V PSU
- I2C Display Module footprint available
- BFCs & Filtering available
### BOM
Coming...
| Part | PN |
| --- | --- |
| 15x2 IDC Plug | 609-5106-ND |
| 15x2 IDC Socket | 609-3475-ND |
| 30 Position Ribbon Cable | 3M157924-50-ND |
log/ucbus-psu-breakout-log.md 0 → 100644
View file @ c1c3b72d
## 2020 08 01
For that power spike, the transient frequency is actually quite high... 500ns 'period', not 15khz: 2mhz. To make a true filter, I should potentially add an R to my C, making a low pass filter. This could pair well with the bleed: if I do a 10k resistor here, I draw 2mA through the 10k, and should use an 80pf (so 100pf) cap to bypass. I'll throw 4 0805 footprints down here, and will start with 10k and 100pf, see how that fares.
OK, through most of the setup.
- pick sercom / DE / RE / TERM etc for RS485 bonus
- pick sercom for i2c display
- pick sercom for rpi serial
- label cut-jumpers, config auto
OK, done.
\ No newline at end of file
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