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As before, when the breakdown voltage is exceeded; all the remaining electrical energy is
transferred through the diode. However, because the breakdown voltage is designed to be
much smaller than the N-type and P-type silicon can cope with, the diode remains func-
tional and the effect is to maintain the potential difference at the break-down voltage.
FIGnition uses Zener diodes to limit the voltage on the USB d+ and d- signals to the speci-
fied 3.6v while allowing FIGnition's AVR microcontroller to operate at 5v. This is described
in
section
7.1.
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