Basic sanity check. Assume that the sum total of power draw must be under 15W.
Take a USB-C power only connector. Wire 5.1K resistors to CC1 and CC2. Send the Vbus to a 3.3V 1A LDO to power the various 3.3V parts, and a 1.2V LDO to power the FPGA. Send the Vbus directly to the controller ports - it’ll be close to 5V, and will have enough current left over to power whatever plugs in, and can be regulated down on an accessory device if need be. Controllers won’t care (they have only a 4000 series shift register good up to like 15V IIRC).
Seem sane for a mini Sentinel?
#Sentinel65X
mos_8502 :verified: /
npub1qn…5hzwk
2024-08-10 17:36:32
Author Public Key
npub1qnufz4pycufk27kkeev5g0fgm0w0tqexsly674s2uwy0tynk5ymsk5hzwkPublished at
2024-08-10 17:36:32Event JSON
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"content": "Basic sanity check. Assume that the sum total of power draw must be under 15W. \n\nTake a USB-C power only connector. Wire 5.1K resistors to CC1 and CC2. Send the Vbus to a 3.3V 1A LDO to power the various 3.3V parts, and a 1.2V LDO to power the FPGA. Send the Vbus directly to the controller ports - it’ll be close to 5V, and will have enough current left over to power whatever plugs in, and can be regulated down on an accessory device if need be. Controllers won’t care (they have only a 4000 series shift register good up to like 15V IIRC). \n\nSeem sane for a mini Sentinel?\n\n#Sentinel65X",
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