RF-Star 42UH, Manual, Page: 14 / 36

RF-83UP
www.szrfstar.com V1.3 - Jun., 2019
Shenzhen RF-star Technology Co., Ltd.
Page 13 of 35
4.3 Schematic Diagram
Figure 6. Schematic Diagram of RF-83UP
4.4 Reference Design of the Connection between MCU and Module
Figure 7. Reference Design of the Connection between MCU and Module
Note: TTL level for module and MCU.
VDD
VDD
VDD
VDD
VDD
50 ohm Microstripe Line
50 ohm Microstripe Line
P1´óÓÚ33dbm
Bias
LR1 30R LR2 30R 1
VIN
2
GND
3
EN
4
NC
5
VO
U1
HT7233
C1
10uF
C2
10uF
C3
100nF
C33
100nF
C7 100nF
C8
100nF
1
R
F
I_
L
F
2
V
R
_
A
N
A
3
V
B
A
T
1
4
V
R
_
D
IG
5
X
T
A
6
X
T
B
7
N
R
E
S
E
T
8
DIO0
9
DIO1
10
DIO2
11
DIO3
12
DIO4
13
DIO5
14
VBAT3
1
5
G
N
D
1
6
S
C
K
1
7
M
IS
O
1
8
M
O
S
I
1
9
N
S
S
2
0
R
X
T
X
/R
F
M
O
D
2
1
R
F
I_
H
F
22
RFO_HF
23
GND
24
VBAT2
25
VR_PA
26
GND
27
PA_BOOST
28
RFO_LF
U3
SX1276
C9
47pF
C10
100nF
C11 100nF
C12 100nF
C15
10nF
C16
47pF
C19
3.3pF
L1
33nH
L6
2.2nH
Y1
32MHz
C5
100nF
C4
100nF
1
NRST/PA1
2
USART1_TX/PA2
3
USART1_RX/PA3
4
PA4
5
PA5
6
VSS
7
VDD
8
P
D
0
/T
IM
3
_
C
H
2
9
P
D
1
/T
IM
1
_
C
H
3
1
0
P
D
2
/T
IM
1
_
C
H
1
1
1
P
D
3
1
2
P
B
0
/T
IM
2
_
C
H
1
1
3
P
B
1
/T
IM
3
_
C
H
1
1
4
P
B
2
/T
IM
2
_
C
H
2
15
PB3
16
SPI1_NSS/PB4
17
SPI1_SCK/PB5
18
SPI1_MOSI/PB6
19
SPI1_MISO/PB7
20
PD4/TIM1_CH2
21
I2C1_SDA/PC0
2
2
I2
C
_
S
C
L
/P
C
1
2
3
P
C
2
2
4
P
C
3
2
5
P
C
4
2
6
P
C
5
2
7
P
C
6
2
8
S
W
IM
/P
A
0
U2
STM8151G4
C40
15pF
C41
15pF
R9
1K
1
2
3
4
5
6
7
8
JP1
Interface
R1 100R
R2 100R
R3 100R
R4 100R
R5 100R
R
6
1
M
R
7
1
M
C18
5pF
C22
9pF
C24
9pF
L3
8.2nH
L4
8.2nH
1
OUT1
2
GND
3
OUT2
4
CONT2
5
IN
6
CONT1
U4
HWS421
C34
100pF
C35
100pF
C26
47pF
L7
560nH
1
NC
2
RF_IN
3
NC
4
NC
5
V
R
1
&
2
6
V
C
T
R
7
V
C
C
B
8
V
R
3
9
RF_OUT
10
RF_OUT
11
RF_OUT
12
RF_OUT/VCC3
1
3
D
E
T
1
4
V
C
C
D
1
5
V
C
C
2
1
6
V
C
C
1
1
7
G
N
D
_1
YP3236W
C6 100pF
C13
L2
12nH
C14 1000pF
C17 2.2uF
C20 100pF
L8
12nH
C21 1000pF
C23 2.2uF
C25 100pF
L9
8.7nH
C27 1000pF
C28 2.2uF
C29
100pF
C31 1000pF
C32 100pF
C36 1000pF
C37 2.2uF
C38 100pF
C39 1000pF
C42 100pF
C43 2.2uF C44 2.2uF
C47
20pF
C45
51pF
A
N
T
1
A
N
T
-S
M
A
1
O
2
G
3
E
4
I
5
G
U6
SGM2036
C50
100nF
C51
100nF
C46
47pF
R10 0R
C49
5.6pF
C52
47pF
C53
47pF
L11
13nH
J3-1
J3-2
J3-3
1
2
3
4
J2
DBG
VDD
VDD
VDD
VDD
VDD
VIN1 VDD VO
PA_BOOST
VR_PA
VDD
AUX
TXD
RXD
M0
M1
M
C
U
_
M
0
M
C
U
_
M
1
RESET
S
W
IM
M
C
U
_
M
1
M
C
U
_
M
0
R
S
T
MCU_TXD
MCU_RXD
M
C
U
_
A
U
X
R
X
E
N
T
X
E
N
NSS
SCK
MOSI
MISO
S
C
K
M
IS
O
M
O
S
I
N
S
S
RST
MCU_M0 MCU_M1
MCU_RXD
MCU_TXD
MCU_AUX
V
O
V
IN
1
+
5
V
V
D
D
+5V
R
X
E
N
TXEN
R
F
V
R
E
F
_
2V
6
VIN1
V
IN
1
VIN1
VREF_2V6
T
X
E
N
VDD
SWIM
RESET