Identify Board Requirements

[agdespopoulos]

Checked items indicate things that have been decided. Things to identify:

• [x] What are the voltage domains in our system?
  • MSP432 boards are powered with 3v3. Do we need 5v? Any other voltage domains?
  • What is our battery voltage? Needs to be decided with the voltage regulators in mind.
  • Separate voltage domain for pyro FETs? Would prevent potential dropouts when pyros are fired.
  • Just 3v3. No 5v. Yes separate battery for pyro FET output.
• [x] What will be on all the boards?
  • common connectors
  • 8 pin microfit connector
  • 2 of them, so that they can be daisy chained
  • 2 3v3 pins, 2 GND pins, SCL, SDA, RST, and TRIGGER/SYNC
    • TRIGGER/SYNC there for synchronization between boards - probably not actually implemented
• [x] What will be on the power board?
  • ~3v3 regulator~
  • ~other regulators?~
  • ~INA260 current/voltage/power monitor?~
  • ~battery connector~
  • COTS solution
• [x] What will be on the attitude board?
  • BNO055
  • some sort of altimeter (I think we picked one, I just forgot)
  • BMP280
  • GPS?
• [x] What will be on the pyro board?
  • 4x pyro MOSFETs
  • INA260 current/voltage/power monitor
  • Separate battery connector
  • screw terminal blocks for easy use
• [x] What will be on the data board?
  • ~uSD card holder~
  • Found a COTS solution

[ADKaster]

For the pyro FET voltage domain we could just YOLO it and put huge capacitors on the MCUs. Couple dozen uF and we'll be all set.

[agdespopoulos]

True, although it's probably easier and safer to just have terminals for an external 9v.