UNICORECOMM UM980 - IO Threshold; Antenna Feature

UC-00-M32 EN R1.0 Hardware Design 13
2.3.3 IO Threshold
Table 2-5 IO Threshold
Parameter
Symbol
Min.
Typ.
Max.
Unit
Condition
Low Level
Input Voltage
V
in_low
-0.3
0.7
V
High Level
Input Voltage
V
in_high
VCC ×
0.65
VCC + 0.3
V
Low Level
Output Voltage
V
out_low
0
0.45
V
I
out
= 2 mA
High Level
Output Voltage
V
out_high
VCC -
0.45
VCC
V
I
out
= 2 mA
2.3.4 Antenna Feature
Table 2-6 Antenna Feature
Parameter
Symbol
Min.
Typ.
Max.
Unit
Condition
Optimum Input
Gain
G
ant
18
30
36
dB
3 Hardware Design
3.1 Antenna Feed Design
UM980 just supports feeding the antenna from the external of the module rather than
from the internal. It is recommended to use devices with high power and that can
withstand high voltage. Gas discharge tube, varistor, TVS tube and other high-power
protective devices may also be used in the power supply circuit to further protect the
module from lightning strike and surge.