FreeCalypso > hg > fc-small-hw
view duart28/src/MCL @ 28:bd7eec55ebc0
duart28: new design ideas
* added input buffers (LVC with Ioff feature) to prevent high current flow
from powered-up target into powered-down FT2232D inputs;
* added series resistors on outputs to limit current flow from powered-up
adapter into powered-down Calypso target;
* buffer IC changed from 74LVC125A to 74LVC541A.
| author | Mychaela Falconia <falcon@freecalypso.org> |
|---|---|
| date | Sun, 28 Jun 2020 22:06:24 +0000 |
| parents | b58388f57c16 |
| children | ccb544045646 |
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# Connectors J1: hier=usb.conn.conn description=USB connector, receptacle, mini-B manufacturer=AMP/TE manufacturer_part_number=1734035-2 vendor=Digi-Key vendor_part_number=A31727CT-ND footprint=file:USB_CONN_1734035 npins=9 # 5 actual pins + 4 mounting pads # main DUART signal set J2: hier=app.target_if.main_if footprint=file:HEADER10_Shrouded description=Shrouded header, 0.100", dual row, 10 posts manufacturer=AMP/TE manufacturer_part_number=2-1761603-3 vendor=Digi-Key vendor_part_number=A97470-ND npins=10 # extra header for DSR, RI and GND J3: hier=app.target_if.aux_if footprint=JUMPER3 description=Header, 0.100", single row, 3 posts manufacturer=Molex manufacturer_part_number=0901200123 vendor=Digi-Key vendor_part_number=WM8073-ND npins=3 # 5V & GND bringout for misc uses J4: hier=aux_5V footprint=JUMPER2 description=Header, 0.100", 2 posts manufacturer=Molex manufacturer_part_number=0901200122 vendor=Digi-Key vendor_part_number=WM8072-ND npins=2 # Ferrite bead L1: hier=usb.VBUS_ferrite manufacturer=Murata manufacturer_part_number=BLM18AG471SN1D description=Ferrite bead for USB, 0603 vendor=Digi-Key vendor_part_number=490-1013-1-ND footprint=0603 npins=2 # ICs U1: hier=usb.FT2232D.FT2232D.pkg manufacturer=FTDI device=FT2232D part=yes description=USB to dual UART adapter IC vendor=Digi-Key vendor_part_number=768-1010-1-ND footprint=LQFP48_7 npins=48 U2: hier=usb.FT2232D.eeprom.pkg device=93C46 manufacturer=Atmel manufacturer_part_number=AT93C46EN-SH description=Serial EEPROM, 64x16, SOIC-8 package footprint=SO8 npins=8 U3: hier=reg_3V3.reg.pkg manufacturer=TI device=TLV70233DBV part=yes description=LDO regulator, 3.3 V output, SOT23-5 vendor=Digi-Key vendor_part_number=296-32415-1-ND footprint=file:TLV702xxDBV npins=5 U4: hier=reg_2V8.reg.pkg manufacturer=TI device=TLV70228DBV part=yes description=LDO regulator, 2.8 V output, SOT23-5 vendor=Digi-Key vendor_part_number=296-39282-1-ND footprint=file:TLV702xxDBV npins=5 part 74LVC541A: device=74LVC541A manufacturer=Nexperia manufacturer_part_number=74LVC541APW description=Octal buffer IC, TSSOP20 package vendor=Digi-Key vendor_part_number=1727-6370-1-ND footprint=file:TSSOP20_MNF npins=20 # buffer for driving outputs from the adapter U5: part=74LVC541A # buffer for inputs coming into the adapter U6: part=74LVC541A # Crystal Y1: hier=usb.FT2232D.xtal manufacturer=IQD manufacturer_part_number=LFXTAL026900 description=Crystal, 6.0 MHz, 16 pF, HC-49 SMT vendor=Digi-Key vendor_part_number=1923-1509-1-ND footprint=HC49_SMT npins=2