Vega Customer Applications Manual Section 10 - Combining Modules
Rev. A3: October 2003 Page 43 of 48
"High" when module good.
Inhibit Connection with combination modules.
Each option board fitted to each module in the combination has the diode of an opto isolted transistor in series with a
390ohm resistor.
Both options need to have the opto isolated diodes connected in parallel.
Applying 5V across the Module inhibit +VE and Module inhibit -VE, as shown, will inhibit the module combination. Do
not apply >6V or damage may result. Current draw at 5V is approx 10mA. The 390ohm resistor is fitted internally to
the module and is there so that no external resistor is required if the drive is from 5V.
It is also possible to use higher voltages than 5V to drive this arrangement. In that case, there should be additional
external resistors to limit the current. Aim to keep the drive currents within the following limits.
1mA to 10mA = Module definitely inhibited.
Less than 0.1mA = Module definitely not inhibited.
Absolute maximum current 13mA.
Module inhibit +VE
390R
Module inhibit -VE
390R
Module 1 of combination
Module 2 of combination
1.1V = Vf (approx)
1.1V = Vf (approx)
Module Good Signal
C
Output Voltage
0V
Module Good signal
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