PCI-PID01 User‟s Manual
16
4. External Interface
4-1 Digital Input
Digital inputs are separated by a Photo-diode. The board circuit is shown in [Fig 4-1].
By controlling the current flow DIN_COM and DIN pin will recognize the logic level on the
board.
DIN_COM
DIN0
in0
2.4K
DIN3
in3
2.4K
+3.3V
+3.3V
[Figure 4-1. Digital Input Circuit]