SkyWave IDP-680 - Digital Input; Figure 12 Digital Input

IDP 600 Terminal Series - Hardware Guide
© SkyWave Proprietary 13 T200, Version 02
3.3.1 Digital Input
Figure 12 shows a schematic of the I/O when configured as a digital input.
Figure 12 Digital Input
Input Type
S1
S2
With weak pull-down
Open
Open
With pull-down
Open
Closed
With pull-up
Closed
Open
The input specifications are provided in the table below.
Parameter
Minimum
Typical
Maximum
Units
Input low range
-10
-
1.05
V
Input high range
1.95
-
150
V
Input current with weak pull-down
(weak 1 MΩ pull-down still in place);
V
in
= 3.0 V
-
3
-
µA
Input source current with pull-up
(V
in
= 0.0 V)
-
75
-
µA
Input sink current with pull-down
(V
in
= 3 to 150 V)
-
80
-
µA
INPUT
DIGITAL
1k
3V
ARM PROCESSOR
1M
3V
1nF
1k
3V
LIMITER
3V
S1
40k
S2
40k