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TE0320 is provided with a slide switch S2. S2 conditionally / unconditionally enables the 1.2 V and 2.5 V power rails.
Figure 33: Slide switch S2 (angle view).
When S2 is turned on (FX2 PON), the 1.2 V and 2.5 V power rails are controlled by the USB (EZ-USB FX2LP USB FX2) microcontroller. At start-up, the USB microcontroller switches off the 1.2 V and 2.5 V power rails and starts up the module in low-power mode. After enumeration, the USB microcontroller firmware switches the 1.2 V and 2.5 V power rails on, if enough current is available from the USB bus.
When S2 is turned off, the 1.2 V and 2.5 V power rails are always enabled.
S2 position | Effect on 1.2 V and 2.5 V rails |
|---|---|
FX2 PON (on)* | 1.2 V and 2.5 V rails controlled by USB FX2 microcontroller (signal FX2_PS_EN) |
PON (off) | 1.2 V and 2.5 V rails always enabled |
Slide switch S2 conditions the value of signal PS_EN.
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