Chapter 2:
Description
13
General purpose digital inputs/outputs
The LCC-10 is provided with 4 general purpose digital inputs and 4 general purpose
digital outputs, all of them TTL compatible.
General purpose inputs
General purpose digital inputs are connected to the main processor through a 1K5
resistor that protects the processor from an over current.
The polarity of GPI is user configurable through its communication interface. Figure 11
illustrates the model of general purpose inputs.
Figure 11: GP input model
General purpose outputs
General purpose digital outputs are driven by a buffer, without any pull up resistor.
The polarity of GPO is user configurable through its communication interface. Figure 12
illustrates the model of general purpose outputs.
Figure 12: GP output model
Following tables show the pin out of the input/output connector (marked as J3 in the
board) and the maximum voltage and current level ranges. GPI, GPO and analog
input/outputs share the same connector.
Pin
ID
Pin
Type
Description
1
-
-
-
2
-
-
-
3
GPI 2
Input
General purpose digital input 2
4
GPI 0
Input
General purpose digital input 0
5
GND
Output
Ground
6
ANALOG
OUT
Output
DAC output
7
-
-
-
J
3
(
IN
P
U
T
/
O
U
T
P
U
T
c
o
n
n
e
c
to
r)
8
GPO 2
Output
General purpose digital output 2