• [ ] Check for shorts
  • [ ] Ground
  • [ ] 3V3
  • [ ] 5V
  • [ ] 1V2

Power Circuitry

SCH2 and SCH3 (except for power headers while waiting for them)

• [ ] Assemble Dual Buck Converter circuit

  • [x] Solder LEDS (BOX 3- LINE ITEM 8)
  • [x] Solder LED Resistors (BOX 3 & 1)
  • [x] Solder LM264 IC
  • [x] Solder resistors
    • [x] 31.6k B3L24
    • [x] 10k B3L15
    • [x] 4.99 B3L23
    • [x] 5.76k B3L26
    • [x] 0.025 B3L25
  • [x] Solder Caps
    • [x] 22uF B3L5
    • [x] 1uF B3L3
  • [x] Solder Inductors
    • [x] 1uH B3L14

• [ ] Assemble eFuse circuit

  • [ ] Solder NIS IC (B2L9)
  • [ ] Solder Resistors
    • [ ] 1K (B3L19)
    • [ ] 5.6 (B3L20)
    • [ ] 14 (B3L21)
    • [ ] 36 (B3L22)
  • [ ] Solder Caps
    • [ ] 22uF (B3L5)
    • [ ] 1uF (B3L3)
  • [ ] Be careful of this

  

• [x] Test Power Circuit

  • [ ] Powering 5V directly to the buck converter → correctly steps down to 3V3 and 1v2 on testpoints
  • [x] BIG ISSUE: Pins on eFuse → bypass that
  • [x] Supply 5V power supply to power headers (using tabletop power supply)
  • [x] Measure and validate 3V3 output with TP31 (RECORD DATA) → 3.33V
  • [x] Measure and validate 1V2 output with TP32 (RECORD DATA) → 1.26V
  • [x] Validate 3V3 Power LED
  • [x] Validate 5V Power LED

• [x] Assemble Current Sensor circuit

  • [x] Solder MAX9934 IC
  • [x] Solder resistors
  • [x] Solder caps
  • [ ] TODO: ADD VALIDATION FOR CURRENT SENSOR LATER

USB-UART Circuitry

SCH1, focus on getting power from USB

• [x] Assemble USB-UART Converter
  • [x] Solder decoupling caps
  • [x] Solder UART VBUS voltage divider
  • [x] Solder 5V RED LED
  • [x] Solder USB-C connector
  • [x] Solder ESD Protection TVS diodes
  • [x] Solder USB-UART Bridge IC + 1K Resistor
  • [x] Solder RXT/TXT LEDs + resistors
• [ ] Test USB-UART Converter
  • [ ] TODO: ADD VALIDATION FOR DATA LINES (after micro probably)
  • [x] Add power jumper to use USB 5V for power supply
  • [x] Measure and validate 3V3 output with TP31 (RECORD DATA) → 3.339V
  • [x] Measure and validate 1V2 output with TP32 (RECORD DATA) → 1.268V

MCU Minimal Testing Phase

Tests the minimal working requirements of the MCU (can it be programmed and turn on an LED)

• [x] Solder RM46
  • [x] Solder Oscillator
• [x] Solder I2C Pull-up resistors
• [x] Solder 2.2k test resistor