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Full power operation (PS_EN = 1): when Dip switch S1B is in the right position (PON = power rails unconditionally on), signal PS_EN is set to power rail 3.3V. Thus power rails 1.2 V, 1.5 V and 2.5 V are unconditionally enabled.

Scroll pdf title
titleS1B on position PON (PS_EN ≠ FX2_PS_EN = x; PS_EN = high ).

 
 

 

Summary table

The table below summarizes all switching options implied by Dip switch S1B and firmware signal FX2_PS_EN (under the standard assembly option). 

Scroll pdf title
titleDip switch S1B settings overview ( 1.2 V, 1.5 V , 2.5 V, VCCIO0).

power rail

S1B= PON
(PS_EN = 1)
(PS_EN ≠ FX2_PS_EN)
(Full power)

S1B = FX2 PON and
PS_EN = FX2_PS_EN = 1

(Dynamic full power)

S1B = FX2 PON and
PS_EN = FX2_PS_EN = 0

(Dynamic low power)

1.2 V

on

on

off

1.5 Vononoff

2.5 V

on

on

off

VCCCIO0 (= 2.5 V)
R102-R103+ assembly (1)

on

on

off

VCCCIO0 (= 3.3 V)
R102+R103- assembly (2)

on

on

on

(1) R102 unpopulated / R103 populated

(2) R102 populated / R103 unpopulated