7.Electrical Interface
© China Daheng Group, Inc. Beijing Image Vision Technology Branch 98
External voltage
EXVCC
External resistance
Rexternal
Line2/3 voltage (V)
Output current (mA)
5V
1kΩ
0.19
4.8
12V
0.46
11.6
24V
0.92
23.1
Table 7-7 Voltage and output current of Line2/3 in typical conditions
Rising time delay = tr+td: <
20μs (0°C~45°C) (parameter description as shown in Figure 7-4)
Falling time delay = ts+tf: <20μs (0°C~45°C) (parameter description as shown in Figure 7-4)
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 7-8
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 7-8 Delay time when GPIO is configured as output in typical conditions
When Line2/3 is configured as output, the internal equivalent circuit of camera is shown in Figure 7-9,
taking Line2 as an example
