Front End Module Control - LG KP500 Service Manual

3. TECHNICAL BRIEF

3.22 Front End Module control

Implemented in the S-Gold3 (FL600) are two outputs which are FE1, FE2 for direct control of front end
modules with two logic input pins to select RX and TX mode as well as low and high band operation.
FEM need 2V85_VRF supply.
Table 12 FEM Control Logic
MODE
VDD
VC1
VC2
RF
6 C 0 0 6 R
GND600
D I N
6 R 0 1
0
6 L 1 0
2 1 H n
LGE Internal Use Only
Tx 1GHz Tx 2GHz
ON ON
OFF ON
ON ON
9 0
GND601
0
6 C 1 0
D I N
SW600
6 R 1 1 6 L 3 0
2 G
A T N F R
1 G
2 2 . H n
0
6 C 9 0
D I N
Figure 29 FEM schematic
Rx 1GHz
ON
OFF
OFF
VRF_2V85
6 C 2 0 6 C 3 0
u 1 3 p 9
FL600
DGM1110M014
6 C 6 0
7 1 SFAY0011101
8 1 p 0
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Rx 2GHz
ON
ON
OFF
F 1 E
F 2 E
6 C 4 0 6 C 5 0
4 p 7 4 p 7
L
1
6 C 1 1
D I N
C 1 6
Only for training and service purposes