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changes.mady.by.user Sergio Pavesi

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When S2 is turned off (open, PON), the 1.2 V and 2.5 V power rails are always enabled (switched on).

(warning)

When S2 is turned on (FX2 PON), make sure that no signals are applied to the input pins when power-rails are disabled by the USB microcontroller (at start-up).

S2 position

Default position

Effect on 1.2 V and 2.5 V rails

FX2 PON (on, closed) 

(tick)

Power rails 1.2 V and 2.5 V controlled by USB FX2 microcontroller (signal FX2_PS_EN)

PS_EN = FX2_PS_EN = 1 or 0

PON (off, open)

(error)

Power rails 1.2 V and 2.5 V always enabled (PS_EN = 1)

PS_EN ≠ FX_PS_EN = 1 or 0

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