Pavel Shatov wrote: > Ideally I'd prefer Peter to provide me with a PDF with a piece of > schematics he wants added, as he suggested earlier, so that I can just > copy it into KiCAD project.
Attached is my proposal schematic, please review it. For reference, the SAMD11 datasheet is (currently) here: https://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-42363-SAM-D11_Datasheet.pdf I also need some feedback on the power supply: The rev03 FTDI chips are bus-powered, so when a rev03 board is connected to a PC the PC always sees a USB device, even if the rev03 board is not currently powered through the 18V supply. On rev03, PCs can only try to use a heuristic with the RPC protocol to guess if the board is running/available or not. This proposed USB interface is self-powered, by VCCO_3V3, so when this interface is connected to a PC the USB device comes and goes on the PC as the 18V supply is connected and disconnected from the rev04 board. Is that change desirable? I hope yes, because USB is really not a static connection, but please share your thoughts. If the change is unacceptable then I'll add a voltage regulator and probably level shifters in a new revision. Thanks a lot! //Peter
cryptech-rev04-usb.pdf
Description: Adobe PDF document
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