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31 lines
1.7 KiB
Markdown
31 lines
1.7 KiB
Markdown
# Oresat CFC Mini-Backplane
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This is the backplane for UMBC's Air Harp 2 sensor, which is going to include a PIRT SWIR sensor using OreSat's CFC system.
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## Requirements:
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* Match the DXF outline from Joe, including placement of connectors and the fastener holes.
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* Probably remove solder mask from both sides of those fastener holes just in case.
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* Probably put the external connectors in the upper right hand corner.
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* Use an OreSat 20 pin debug connector on this backplane so we can run USB from the CFC processor to the external connector using the CFC processor's debug connector.
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* External connections
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* Power should come through a 0.2 inch euroterminal for two 20 AWG wires.
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* USB should be via a [Harwin M80-5400442](https://www.digikey.com/en/products/detail/harwin-inc/M80-5400442/4953167) connector. Pin-out is determined by us.
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* signals: USB D+, USB D-, Vbus, and GND.
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* Vbus should go through a 10k ohm resistor between the 20 pin debug connector and the Harwin connector.
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## Required changes to the CFC Processor and CFC sensor boards
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Easiest thing to do:
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* Both OPDs should come on by default, so we need to bypass or hack the OPDs to turn on.
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* We may want to figure out some way to power the local OPDs so they're not doing anything weird with their connections to the Octavo.
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A Ben Idea:
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* Add a 8.4V to 5V LDO, a Trinket M0, two 4.7K resistors, and use Oliver Rew's Arduino code to turn on both CFC cards
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* This assumes we have Trinkets, which I believe we have a bunch lying around.
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* This is cute because we don't have to modify the sensor or processor card, which I hate doing.
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* Be careful of the 8.4V max input voltage can power the trinket without frying it (thus the 5V LDO).
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