Digital I/O Configuration
3-2
Controlling devices using pull-up resistors
CAUTION
Failure to set J201 to the Vext position,
when using external pull-up voltages,
may result in damage to the output
drivers.
Figure 3-2
Output configuration using pull-up resistance
When interfacing outputs to high-impedance devices (i.e.,
logic devices), internal pull-up resistors are used to achieve
the appropriate logic level. Figure 3-2 shows the output con-
figuration using the 10k
Ω
pull-up resistor (Rp).
The configuration in Figure 3-2 uses the internal 5V source
as the high logic level. If you need a higher logic level, you
can place the jumper in the alternate position and apply an
external voltage (via V
EXT
).
Driver
Jumper
5V
V
EXT
Logic
device
7022
R
P
10k
Ω
GND
Or
gate
A
B
Y
+V
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