QPRO Technical Data Sheet
Document 1137-0901, REV A
14
Figure 4-5, Digital Input Circuit
4.2.1 Switched Digital Relay
Four available: Pins 18/19 and 20/21
•
Two pins route the supplied input voltage on Pins 18 and 19.
•
Two pins provide switch closure to ground Pins 20 and 21.
These inputs can sink 1A continuous current at ambient temperatures and are de-rated as seen in the chart
below.
Figure 4-6, Switched Relay Characteristics
Warning
: Connecting SW_UBATT1 or SW_UBATT2 (pin 27 and 25) directly to ground while the switch
is turned “ON” will damage the unit. If SW_GND1 or SW_GND2 (pin 26 and 28) is tied directly to VBATT (Pin
In
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