98
•
Technical Specifications
Xtium-CL MX4 User's Manual
Note 1: General Inputs / External Trigger Inputs Specifications
Each of the four General Inputs are opto-coupled and able to connect to differential or single ended
source signals. General Input 1 and 2 can also act as External Trigger Inputs. See “Board
Information” user settings. These inputs generate individual interrupts and are read by the Sapera
application.
•
Note: On Rev A1, only General Input 1 can be connected to a differential source signal.
The following figure is typical for each Genera Input. General Input 1 can be connected to a
differential input signal. Note that in this specific case, the other 3 General Inputs cannot be used.
V
From User
Interface
Connector
EMI
Filter
Figure 27: General Inputs Electrical Diagram
Input Details:
•
Maximum input voltage is 26V.
•
Maximum input signal frequency is 100 KHz.
•
Each input has a 649-ohm series resistor on the opto-coupler input.
•
The 0.01uF capacitor provides high frequency noise filtering.
•
Minimum current is dependent on input voltage applied: I
optoin
(min) = (V
optoin
- 0.5)/649Ω
•
The switch point is software programmable to support differential (LVDS/RS422) or single
ended TTL, 12V or 24V input signals.
For External Trigger usage:
•
Input signal is “debounced” to ensure that no voltage glitch is detected as a valid transition.
This debounce circuit time constant can be programmed from 1
µ
s to 255
µ
s. Any pulse smaller
than the programmed value is blocked and therefore not seen by the board. If no debounce
value is specified (value of 0
µ
s), the minimum value of 1
µ
s will be used.
•
Refer to Sapera parameters:
CORACQ_PRM_EXT_TRIGGER_SOURCE
CORACQ_PRM_EXT_TRIGGER_ENABLE
CORACQ_PRM_EXT_TRIGGER_LEVEL
CORACQ_PRM_EXT_FRAME_TRIGGER_LEVEL
CORACQ_PRM_EXT_TRIGGER_DETECTION
CORACQ_PRM_EXT_TRIGGER_DURATION
•
See also *.cvi file entries:
External Trigger Level, External Frame Trigger Level, External Trigger Enable, External Trigger
Detection.
•
External Trigger Input 2 used for two pulse external trigger with variable frame length line scan
acquisition.
