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Power Module - Backplane
Overview
This module provides power to the backplane and other modules.
Current Status
Layout
Action Items
@James May (RIT Student) Update Block Diagram to reflect current design
@James May (RIT Student) simulate umbilical switch in LTspice, look at power loss
@James May (RIT Student) Assemble BOM & include all components
Create BOM file
Add switcher
Add switcher passives
Add umbilical switch components
Add monitoring components
Add monitoring passives
Add microcontroller
Add microcontroller passives
Add WIZnet
Add WIZnet passives
Add flash memory
Add flash passives
@James May (RIT Student) Spec shielded inductors
@James May (RIT Student) Complete schematic capture
Complete switcher design
5V switcher
3.3V switcher
Backplane connector
current measure (all 3)
voltage measure
WIZnet
Complete battery/umbilical switch design
Battery/umbilical switch transfer to Billy
Review umbilical switch diode
Umbilical connector choose
33R to wiznet
Arrange top level
Determine MCU pinouts
Programming interface
Add microcontroller & logging circuitry (should be roughly identical to other modules)
Add nc mount holes
Address pins to mcu
Polyfuse & standard fast-blow fuse to battery line (poly rated to trip before fast-blow)
Reverse polarity protection on battery line
Add ESD protection
FETs on wiznet LEDs?
Update backplane connector
Add NCs to MCU
Make power jumper female
REF designators
Fix MCU top level block
Swap to INA219
Volt current sense pins?
@James May (RIT Student) Complete layout
Define board shape (including fillets!)
Ensure mounting holes are placed in correct spots
Ensure backplane connector is placed in correct spot
Place components
Calculate power trace widths
set components in meaningful way
Fix layer stackup
Route power traces
Route signal traces
polygon pours
Silkscreen it up (following standards)
Import Ben's DRC
Run DRC until good
@James May (RIT Student) Simulate switchers in Webench
@James May (RIT Student) Layout Review Updates
Swap out old ESD for new ESD
8mil trace & 8mil spacing compliance
Silkscreen unstupid
Via 1:2 compliance
Nuke ref des?
Make fonts guardians
Ensure all components have jlc number
Fix diff pairs
Tooling holes
Board # JLCJLCJLC
Move crystal
Tooling holes
Via stitch grounds
Un-nuke designators a bit
Silkscreen launch standard compliance
flippy flip switcher circuits?
pull back ground pour?
@James May (RIT Student) Generate Manufacturing Files
Bill of Materials
https://docs.google.com/spreadsheets/d/11sWTTM-sTX7rhC-IRGJUKW5k7srjvS_wg9Uwbcga4CQ/edit?usp=sharing
Power Budget
https://docs.google.com/spreadsheets/d/1P6vVKbwPyueS9w23q3px6IzPuvbkSv0gtSdnh-D0MMo/edit?usp=sharing
Block Diagram
Links