level translation.

Back Power Through J8

As described above, a simple deployment can power peripherals via the 5V

and 3.3V pins of J8. But it’s also possible to apply power to the Pi via those

lines. The Pi Foundation call this “back powering”, and they have a number

of recommendations for it’s implementation.

The first recommendation is to duplicate the fuse and MOSFET + BJT

power protection circuit as seen on the Pi itself. This circuit is a variant on

the “ideal diode” circuit.

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