EVS XT2 - GPIO Hardware Specification

XT Series DISK RECORDER – Version 9 - Hardware Technical ReferenceIssue 5.00
EVS Broadcast Equipment SA – April 2008
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2.5.2 GPIO HARDWARE SPECIFICATION
4 X Relay isolated output:
• normally open contact (power off -> open)
• maximum 1A
• maximum 50 Volts
• typical life time: 100.000.000 switching
4 X Opto isolated input:
• The input consists in an opto diode (VF @ 1.1 Volt) in series with a 470
ohm resistor).
• Typical switching point @ 1.4 mA, for secure operation:
o i=0 to 0.5 mA -> opto OFF
o i=2.5 to 30 mA -> opto ON
o imax= 30 mA
• Direct connection to a TTL/CMOS signal possible (Pin opto - to GND and
pin opto + to the TTL/CMOS signal.
Typical switching point @ 1.6 Volts, for secure operation:
o Vin< 0.8 Volts -> opto OFF
o Vin> 2.2 Volts @ 2 mA -> opto ON
o Vin max (without external resistor) = 15 Volts
4 X CMOS input/output:
• each pin can be individually configured as an output or an input
• internal 4K7 pull up to +5V
• low level Vi<1.5 Volt (U12=74HC245)
• high level Vi>3.5 Volt (U12=74HC245)
• optional TTL compatible level (U12=74HCT245)