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CIRCUIT DIAGRAM-MAIN BOARD (FM)
GPIO11
GPIO11
[2]
GPIOC2
GPIOC2
[2]
GPIO21
GPIO21
[2]
DV33
DV33
[1,2,3,4,5]
L4
FB600R
DV33
L0805
TC1
C108
+
22nF
10uF/16V
GND
7-1
Near phonejack(PT-242)
FM
TP4
ANT
VCC_FM
L32
270nH/0603
GND
FM_RST
GPIO11
R149
C114
15K
470pF
GPIOC2
GND
If use 3V3D to power the si4702
chip. must use GPIO to controll the
FM reset
GPIOC3
C105 22pF
X1
32.768KHz
CLK
C106 22pF
GND
GND
C107
U10
GND
C109
1
15
NC
GND
1000pF
2
14
FMIP
LOUT
Si4702
3
13
RFGND
ROUT
QFN20
4
12
GND
GND
FM_RST
5
11
RST
VD
Si4702
GND
VCC_FM
GND
R148
10K
C113
R150
10K
100nF
R57
1K
C5
VCC_FM
100P
GND
SI4702/03
VCC_FM
22nF
C110 470P
GND
FMINL
FMINR
GND
C111 470P
VCC_FM
C112
22nF
GND
GND
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