Power Management Requirements

Energy sources

• Harvesting:
  • Solar cells
    • SPV1040
    • SPV1050
  • Seebeck TEGs
    • SPV1050
  • Piezo elements
  • LEDs
• External:
  • USB-C and USB-PD
    • STUSB4710
  • PoE
    • PM8800A
  • Battery

Internal storage

One or more Murata super-cap things, possibly in multiple locations (eg. might have some in photonics as interim store for solar cells).

When external power is available, it should be used in preference to internal storage in terms of driving circuits. However, it should also be used to charge internal storage if applicable.

Energy management

• Ability to switch between different storage sources and external supplies.
• Ability to enable/disable circuit branches ideally via I2C
• Method for handing brownouts and blackouts
• Prioritisation, scheduling/triggering of sensor events

Other stuff

• STEF033 - eFuse