Switch Settings
2-12
ADSP-21375 EZ-KIT Lite Evaluation System Manual
Electret Microphone Select Switch (SW4)
To connect an electret microphone to the audio input, place all positions
of the
SW4
switch
ON
. The default position of the switch is all
OFF
. When all
of the
SW4
positions are
ON
, a DC offset of 2.5V is added to the signal, and
gain of the input amplifiers is changed from 1x to 10x.
UART Enable Switch (SW5)
The UART enable switch (
SW5
) disconnects UART signals from the DPI
pins of the processor. When the switch is
OFF
, the associated DPI signal
(see
) can be used on the expansion interface.
Loop-Back Test Switches (SW6 and SW14)
The loop-back test switch
SW6
is located at the top left side of the board.
The second loop-back test switch,
SW14
, is located at the top right side of
the board. These switches are used only for testing; all switch positions
should remain
OFF
.
Table 2-5. UART Enable Switch (SW5)
Switch Position
EZ-KIT Lite Signal
Processor Signal
1 (
OFF
1
)
1 Bold typeface denotes the default setting.
CTS
DPI12
2 (
ON
)
RX
DPI10
3 (
OFF
)
RTS
DPI11
4 (
ON
)
T2IN
tied to
R2OUT
N/A
