Clear-Com Eclipse-PiCo - Manual (Page 47)

Clear-Com Communication Systems
Eclipse PiCo Matrix Instruction Manual 4 - 9
Figure 4-7: Opto-Isolated Connection to Eclipse PiCo GPI Connector
In this mode, a DC voltage of between 7 and 24 volts is required at the
EXTVIN+ pin with relation to the EXTVIN– pin. To cause an input to
detect an active signal current must be sent from the relevant input pin.
The external device should draw no current to cause an inactive input
and at least 5 mA to cause an active input. The opto-isolator drive line
contains a 1.5 kOhm resistor to limit the current through the
opto-isolator. It is therefore possible to connect the input pins directly
to the EXTVIN– level to cause an active input.
The voltage level at the external input pin should not be allowed to go
below EXTVIN– or above +6 V with respect to EXTVIN–.
+ C
10uF_10V D
BYG22D + C
10uF_25V
INPUT 1 EXTVIN-
EXTERNAL INPUT 2
EXTVIN+
INPUT 2
R29 1.5K
U
LM78L05ACM
VIN
8
VOUT
1
7-24V
R30 1.5K
U
MOCD207-M
1
3
2
4
8
7
6
5
EXTERNAL INPUT 1
R
33K2
+3V3
R
33K2
+3V3