LX1553-5
FEATURES
5.3.2 Input Considerations
Limits:
The Lx1553-5 discrete inputs can withstand up to 35 VDC applied to the
pin. The discrete inputs are capable of interfacing with industry standard avionics
discrete signals.
Usage:
Some Lx1553-5 discrete inputs can be configured as input triggers using
Ballard’s BTIDriver API. Once the input has been configured as a trigger it may
no longer be used as a discrete input. Refer to Section 5.3.5 for additional
information.
5.3.3 Shunt Outputs
A shunt output is typically an open-collector circuit and is normally high
impedance. When driven, the output sinks current to ground in a low impedance
state. Shunt outputs can be used to communicate with an input discrete and/or to
energize a load.
The Lx1553-5 discrete shunt output circuit, illustrated in Figure 5.2, is a low side
switch capable of sinking up to 200 mA of current to ground through the external
load (Z
ext
). A diode protection circuit permits safe switching of inductive loads.
Over-load detection limits the sink current and shuts the device down in an over-
temperature condition. Each output circuit is wired in parallel with an input
circuit (not shown) providing self monitor capabilities.
Figure 5.2—Lx1553-5 Discrete Shunt Output Circuit
5.3.4 Output Considerations
Limits:
The Lx1553-5 discrete outputs are open-ground switches capable of
sinking up to 200mA. The discrete outputs can withstand up to 35 VDC and are
capable of interfacing with industry standard avionics discrete signals.
Usage:
Some Lx1553-5 discrete outputs can be configured as output syncs using
Ballard’s BTIDriver API. Once the output has been configured as a sync it may
no longer be used as a discrete output. Refer to Section 5.3.5 for additional
information.
Lx1553-5 User’s Manual
5-3
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