UC-08-M32 EN R1.0
Antenna Circuit
11
Dual buffer/driver
with open-drain outputs
0805
U4 LT6000IDCB#TRMPBF
Q1
Si2333CDS-T1-GE3
U6 SN74LVC2G07DBVR
U2 SN74LVC2G07DBVR
Dual buffer/driver
with open-drain outputs
Figure 4-1 Antenna Detection Circuit
Table 4-1 Truth Table of the Antenna Detection Circuit
ANT-OFF
ANT-DETECT
ANT-SHORT-N
1
X
X
The antenna feed supply is
turned off
0
0
0
An error occurred in the circuit
0
0
1
The antenna feed current < 50
mA; no antenna detected
0
1
0
The antenna feed circuit is
shorted to ground
0
1
1
The antenna feed current > 50
mA; the antenna status is
normal
Figure 4-2 Antenna Detection Circuit on the Bottom of UM980eb
