Software-Controlled Switches (SoftConfig)
2-4
ADSP-BF707 EZ-KIT Lite Evaluation System Manual
shows two individual FET switches (Pericom PI3A125CEX)
with reference designators UA and UB. Net names
ENABLE_A
and
ENABLE_B
control UA and UB. The default FET switch enable settings in this exam-
ple are controlled by resistors
RA
and
RB
which pull the enable pin 1 of UA
and UB to ground (low). In a real example, these enable signals are con-
trolled by the Microchip IO expander. The default pull-down resistors
connects the signals
EXAMPLE_SIGNAL_A
and
EXAMPLE_SIGNAL_B
and also
connects signals
EXAMPLE_SIGNAL_C
and
EXAMPLE_SIGNAL_D
. To disconnect
EXAMPLE_SIGNAL_A
from
EXAMPLE_SIGNAL_B
, the Microchip IO expander is
used to change
ENABLE_A
to a logic 1 through software that interfaces with
the Microchip. The same procedure for
ENABLE_B
would disconnect
EXAM-
PLE_SIGNAL_C
from
EXAMPLE_SIGNAL_D
.
Figure 2-2. Example of Individual FET Switches
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