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5.4.3
Characteristics of optical interface
The relationship of the input signal to the output signal through the optical interface is as follows.
270Ω
Time Delay Rise
TDR (us)
Rise Time
RT (us)
Time Delay Fall
TDF (us)
Fall Time
FT (us)
5.5
Pulse Generator
The SP-20000-USB has a frequency divider using the sensor clock as the basic clock and two pulse
generators. In each Pulse Generator, various Clear settings are connected to GPIO.
The following shows Pulse Generator default settings.
Table - 7
Pulse Generator default settings
Display Name
Clock Pre-scaler
Pulse Generator
Selector
-
Pulse Generator 0
-
Pulse Generator 1
Note: When Pulse Generator Repeat Count is set to "0", the camera is operating in free-running mode.
However, based on the above default settings, Length=1, Start Point=0 and End Point=1, Pulse Generator stops at
High output. Therefore, if Start Point =0 and End Point=1 are configured, Length should be "2" as the minimum
active width.
5.5.1
Clock Pre-scaler
Clock pre-scaler (Divide Value) can set the dividing value of the frequency divider (12-bit
length) and the sensor clock is used for this. Two built-in pulse generators work by the same clock.
In the SP-20000-USB, the sensor pixel clock is 40 MHz .
SP-20000M-USB / SP-20000C-USB
User Power（VCC）
3.3V
5V
0.54
0.54
1.2
1.2
1.5
1.5
3.6
3.4
Fig.9
Optical interface characteristics
Value
1
Pulse Generator
Length
Start
End
Point
Point
1
0
1
1
0
1
- 19 -
User
12V
Power
24V
0.62
0.68
2
3
2.4
2.1
4.5
6.8
Repeat
Clear
Clear
Count
Source
Inverter
0
Off
True
0
Off
True
SP-20000
Output line
270Ω
Voltage
Clear
Clear
Activation
Sync
Mode
Off
Async Mode
Off
Async Mode
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