TE0320 is provided with a slide switch S2.
Slide switch S2 conditions the value of signal PS_EN.
In this way, S2 conditionally/unconditionally enables the 1.2 V and 2.5 V power rails.
Slide switch S2 conditions the value of signal PS_EN.
Figure 33: Slide switch S2 (angle view).
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S2 position | Default position | Effect on 1.2 V and 2.5 V rails |
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FX2 PON (on) | 1.2 V and 2.5 V rails controlled by USB FX2 microcontroller (signal FX2_PS_EN) PS_EN = FX2_PS_EN = high 1 or low0 | |
PON (off) | 1.2 V and 2.5 V rails always enabled (PS_EN = high1) PS_EN ≠ FX_PS_EN = 1 or 0 |
Table 14: Slide switch S2 settings overview (1.2 V and 2.5 V rails only).
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Port D Pin | Alternate Function | Alternate Function is Selected By... | Alternate Function is Described in... |
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PD.7:0 | FD[15:8] | IFCFG1 = 1 and any WORDWIIDE bit = 1 | Slave FIFOs chapter 9 on page 99 |
Table from EZ-USB(R) Technical Reference Manual (EZ-USB_TRM.pdf).
Power-rail 3.3V is not controlled by signal PS_EN and is unconditionally enabled.
Figure 3837: Power rails 3.3V could not be enabled/disabled by signal PS_EN.
According to the corresponding assembly option, power rail VCCCIO0 can depend or not on the 2.5V power rail.
Figure 37: example of VCCIO0 assembly not dependent on 2.5V power rail. The other way is also possible.
When slide switch S2 is in the left position ( = FX2 PON : power rails conditionally on depending on signal FX2_PS_EN), signal PS_EN is set to signal FX2_PS_EN (PS_EN = FX2_PS_EN) driven by the EZ-USB FX2LP USB FX2 microcontroller under user control (IOD and OED of fw.c).
Figure 3538: S2 on position FX2 PON (PS_EN = FX2_PS_EN = high 1 or low 0 ).
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Full power operation (PS_EN = high1): when slide switch S2 is in the right position (PON = power rails unconditionally on), signal PS_EN is set to power rail 3.3V. Thus power rails 2.5V and 1.2V are unconditionally enabled.
Figure 3439: S2 on position PON (PS_EN ≠ FX2_PS_EN = x; PS_EN = high ).
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power rail | S2= PON | S2 = FX2 PON and | S2 = FX2 PON and |
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1.2V | on | on | off |
2.5V | on | on | off |
VCCCIO0 (= 2.5V) | on | on | off |
VCCCIO0 (= 3.3V) | on | on | on |
(21) R131 soldered / R132 unsoldered
(32) R131 unsoldered / R132 soldered
Table 1440: Slide switch S2 settings overview ( 1.2V , 2.5V, VCCIO0).
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Assembly option when resistor R17 not populated and R19 populated is equivalent to slide switch S2 permanently set to PON.
Figure 3741: assembly option: S2 = PON.
Assembly option when resistor R17 populated and R19 not populated is equivalent to slide switch S2 permanently set to FX2 PON.
Figure 3842: Assembly option: S2 = FX2 PON.
Any other assembly options of R17 and R19 are not allowed. |
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