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When S2 is turned off, the 1.2 V and 2.5 V power rails are always enabled.

S2 position

Default position

Effect on 1.2 V and 2.5 V rails

FX2 PON (on)(1)

(tick)

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

PON (off)

(error)

1.2 V and 2.5 V rails always enabled

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Table 14: Slide switch S2 settings overview (1.2 V and 2.5 V rails only).

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