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Circuit Boards
Receiver Board Schematic
VDD_3.3V
C2
C3
C1
M CU
104
104
104
VBAT
VDD
PC13_TAMPER_RTC
2
PC14_OSC32_IN
3
PC15_OSC32_OUT
R2
4
10K
OSC_IN
5
R3
OSC_OUT
10K
6
RESET
7
RESET
C6
103
PA0_WKUP
10
PA1
11
PA2
12
PA3
13
PA4
14
PA5
15
PA6
16
PA7
17
P80
18
P81
19
P82_BOOT1
20
U3
PB10
21
PB11
22
VSS
STM32F103C8T6
Transmitter Board Schematic
From Main Board J3
J1
1
SPI2_MOSI
3
SPI2_MISO
5
SPI2_SCK
7
SPI2_NSS
VDD_3.3V
C4
C5
104
104
VDDA
PB9
46
PB8
45
BOOT0
44
P87
43
P86
42
P85
41
P84
40
P83
39
PA15
38
SWCLK
PA14
37
SWDIO
PA13
34
USB_D+
PA12
33
USB_D-
PA11
32
R1
1.5K
PA10
31
SI24R1_IRQ
PA9
30
SI24R1_CE
PA8
29
R6
100R
SPI2_MOSI
PB15
28
R7
100R
SPI2_MISO
PB14
27
SPI2_SCK
PB13
26
SPI2_NSS
PB12
25
VSSA
VDD_3.3V
2
4
SI24R1_CE
6
SI24R1_IRQ
8
C1
C2
C10
C3
47U/25V
103
102
33nf
1
SI24R1_CE
CE
2
SPI2_NSS
CSN
3
SPI2_SCK
SCK
4
SPI2_MOSI
MOSI
5
MISO
SPI2_MISO
SI24R1_IRQ
SI24R1
VDD_3.3V
C7
C8
C9
103
33nf
102
1
SI24R1_CE
CE
2
SPI2_NSS
CSN
3
SPI2_SCK
SCK
4
SPI2_MOSI
MOSI
5
MISO
SPI2_MISO
SI24R1_IRQ
RESET
VDD_3.3V
R20
10K
IMP809TEUR 3.08V
RESET
3
2
VCC
/RESET
U15
1
PROGRAMMING HEADER
VDD_3.3V
T1
T2
SWDIO
T3
SWCLK
T4
T5
RESET
22K 1%
R1
VDD_3.3V
15
VCC
14
VSS
13
RFN
12
RFP
11
VDD_PA
U1
Si24R1
Y1
16M
C4
C5
20pF
20pF
22K 1%
R5
15
VCC
14
L1
VSS
13
RFN
12
RFP
3.9nH
11
VDD_PA
L4
2.7nH
U1
Si24R1
C14
2.2nF
R4
DNS
16M
Y1
C10
C11
20pF
20pF
ANT1
L1
3.9nH
C7
1pF
L3
2.7nH
C8
C9
2.2nF
4.7pF
ANT1
C13
1pF
C15
4.7pF
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