Operation As An Input; Electrical Characteristics - Basler acA2040-55 User Manual

Physical Interface
5.9.3

Operation as an Input

This section describes the electrical operation of a GPIO line when the line has been set to operate
as an input.
5.9.3.1

Electrical Characteristics

Voltage outside of the safe operating voltage range can cause damage.
You must supply power within the safe operating voltage range.
The following I/O supply voltage requirements apply to a direct-coupled GPIO line when the line is
set as an input.
Voltage Significance
+30.0 VDC Absolute maximum. The absolute maximum must never be exceeded. Otherwise, the
camera can be damaged and the warranty becomes void.
+0 to +5.0 VDC Safe operating input voltage range (the minimum external pull up voltage is 3.3 VDC as
illustrated in Figure 44).
+0 to +0.8 VDC The voltage indicates a logical 0 (inverter disabled).
"voltage level low" of Section 5.13 on
> +0.8 to +2.0 VDC Region where the transition threshold occurs; the logical status is not defined in this
region.
> +2.0 VDC The voltage indicates a logical 1 (inverter disabled).
"voltage level high" of Section 5.13 on
Table 23: Voltage Requirements for a Direct-coupled GPIO Line Set as an Input
Your application must be able to accept 2 mA (sink current) from the direct-coupled GPIO input line
without exceeding +0.8 VDC, the upper limit of the low status. The current draw for high-level input
current is < 100 µA.
Figure 43 shows the applicable electrical circuit when a GPIO line is set to operate as an input. The
figure is drawn to specifically apply to pin 1 (Line 3) as an example. However, with the necessary
modifications, the figure applies equally to pin 3 (Line 4).
The figure shows, as an example, the use of a TTL or CMOS logic gate in the external circuit. A
different example for an external circuit is shown in Figure 44.
80
NOTICE
page 103.
page 103.
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