Overview

This module provides power to the backplane and other modules.

Current Status

Layout

Action Items

  • James May Update Block Diagram to reflect current design
  • James May simulate umbilical switch in LTspice, look at power loss
  • James May 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 Spec shielded inductors
  • James May 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 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 Simulate switchers in Webench
  • James May 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 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




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