7.Electrical Interface
© China Daheng Group, Inc. Beijing Image Vision Technology Branch 22
t
d
t
s
t
f
t
r
90%
10%
OUTPUT2
LINE2
Figure 7-9 Parameter of opto-isolated output circuit
⚫
Delay time (td): the time required from 50% rising of OUTPUT2 to the decrease to 90% of the
maximum value of LINE2
⚫
Falling time (tf): the time taken for the amplitude of LINE2 to decrease from 90% to 10% of the
maximum value
⚫
Storage time (ts): the time required from 50% falling of OUTPUT2 to the rise to 10% of the maximum
value of LINE2
⚫
Rising time (tr): the time for the response of LINE2 to rise from 10% to 90% of its final value
⚫
Delay parameters are affected greatly by external voltage and external pull-up resistor, but little by
temperature. Output delay time in typical application conditions (temperature is 25°C) are shown in
Table 7-6
Parameter
Test Conditions
Value (us)
Storage time (ts)
External power is 5V,
pull-up resistor is 1kΩ
0.17
~
0.18
Delay time (td)
0.08
~
0.09
Rising time (tr)
0.11
~
0.16
Falling time (tf)
1.82
~
1.94
Rising time delay = tr+td
0.19
~
0.26
Falling time delay = tf+ts
1.97
~
2.09
Table 7-6 Delay time when GPIO is configured as output in typical conditions
⚫
When Line2 is configured as output, the internal equivalent circuit of camera is shown in Figure 7-10
