Intel
ยฎ
EP80579 Integrated Processor Product LineโLow Pin Count (LPC) Interface
Intel
ยฎ
EP80579 Integrated Processor Product Line
Platform Design Guide May 2010
192 Order Number: 320068-005US
the life of the device). The V
PP
of 12V would be useful in a programmer environment,
which is typically an event that occurs very infrequently (much less than 80 hours). The
V
PP
pin must be connected to 3.3V on the motherboard.
In some instances, it is desirable to program the FWH during assembly with the device
soldered down on the board. To decrease programming time, it becomes necessary to
apply 12V to the V
PP
pin. The circuit in Figure 128 allows testers to put 12V on the V
PP
pin while keeping this voltage separated from the 3.3V plane to which the rest of the
power pins are connected. This circuit also allows the board to operate with 3.3V on
this pin during normal operation.
Figure 128. FWH VPP Isolation Circuitry
Note: This is an example only. See the specification for the FWH being used for more details.
1 Kฮฉ
FET
12 V (From Motherboard)3.3 V
VPP
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