THORLABS BBD301, Руководство пользователя

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Appendix A
HA0409T Rev B Aug 2021
Page 68
A.3.4 Digital Inputs
The digital inputs used in the controller are of the standard CMOS logic gate type with
TTL compatible input levels and a built-in pull-up resistor (10 k
Ω
to +5 V). They can be
connected directly to mechanical switches, open-collector type outputs or most type
of logic outputs.
5V
I
Gnd
Fig. A.6 Digital Input Schematic (protection circuitry not shown)
When connected to a switch, the inputs will read as logic LOW if the switch is open
circuit and HIGH if the switch is closed. When connected to a logic output, or any other
voltage source, the input is guaranteed to read LOW if the voltage is above 2.4 V and
HIGH when the output is below 0.8 V. Please see the APTServer helpfile for details
on software calls used to control these logic IO.
A.3.5 +5 Volt Supply
A +5 V, 250 mA supply is provided for interfacing to external circuits that require a
power source.
10K
N
The voltage applied to the digital inputs must be within the range
0 V to +7 V DC, or damage to the outputs may occur.
Caution
Do not exceed the 250 mA maximum output current. For applications
requiring higher currents an external power supply must be used.
Caution