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Small Spacecraft Missions – How About Flying a CubeSat? - page 24 / 44

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Slide 24

www.pumpkininc.com

Construction

Operating voltages

Transceivers run at +5V due to power considerations. Typical efficiency is < 25%.

uC’s run at +5V, +3.3V, …, +1.8V.

Various peripherals have narrower ranges. E.g. SD card: +3.3V (low-voltage cards do exist)

Most flash memory (e.g. in the uC) cannot reprogram itself at very low voltage. Charge pumps (big power consumer) are required.

Many +3.3V parts are +5V I/O tolerant.

Recommend +5V and/or +3.3V EPS outputs, I/O at +3.3V

Level-shifting can consume a lot of power, esp. if charge pumps are used.

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