Interface Description
21
Voltage
Description
Note
voltage which should not be exceeded,
otherwise it will cause damage to the
device
an inductive load such as intermediate relay,
please use the built-in freewheeling diode or
the output interface will be damaged.
DC
＜
3.3V
I/O output may go wrong if logical 1 has
been set within this range, it is advised
to use 0V to indicates logical 0
DC3.3V
～
+24V
Any voltage within this range can be
used to indicates logical 1, it is defined
by user
The max continuous current of isolated I/O output is 50mA.
Figure 2-5 Opto-isolated Output Circuit
2.3.2.3
GPIO Input
Sheet 2-5 GPIO Input
Voltage
Description
DC30.0V
Limit voltage: input voltage should not exceed this limit, otherwise it will cause
damage to the device
DC0
～
5.0V
Input safe operating voltage range
（
the min voltage is DC 3.3V when pulled-up
from external
）
DC0
～
0.8V
Indicates logical 0
DC
＞
0.8V
～
2.0V
Input state reverses and logic state is not certain
DC
＞
2V
Indicates logical 1
The user's external circuit must be able to sink a maximum current of 2mA while the voltage does not
exceed DC 0.8V. The sink current of the interface should be less than 100uA when input voltage is a
high level.