7.Electrical Interface
© China Daheng Group, Inc. Beijing Image Vision Technology Branch 76
7.3.3.1. Line2/3 is Configured as Input
When Line2/3 is configured as input, the internal equivalent circuit of camera is shown in Figure 7-8, taking
Line2 as an example:
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2
8
7
6
4
5
3
3.3V
Line2
INPUT2
External
circuit
Camera internal circuit
Figure 7-8 Internal equivalent circuit of camera when Line2 is configured as input
To avoid the damage of GPIO pins, please connect GND pin before supplying power to Line2/3.
Logic 0 input voltage: 0V~+0.6V(Line2/3 voltage)
Logic 1 input voltage: +1.9V~+24V(Line2/3 voltage)
The status is unstable when input voltage is between 0.6V and 1.9V, which should be avoided
When input of Line2/3 is high, input current is lower than 100uA. When input of Line2/3 is low, input
current is lower than -1mA
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2
8
7
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4
5
3
3.3V
Line2
FPGA INPUT2
Camera internal circuit
External
circuit
Signal
output
Power+
PWR
GND
NPN
Pull-up
resistor
Figure 7-9 NPN photoelectric sensor connected to Line2 input circuit
