Schematics

1 1
2 2
3 3
4 4
D D
C C B B
A A
Title
Number RevisionSize
A4
Date: 2020/10/8 Sheet of File: C:\Users\..\CBU-4_V100-0806.SchDoc Drawn By:
*
CBU-3
*
RF
1
TP1
R110K
3.3V
PWM2
PWM1
PWM0
PWM4
UART1_RXD UART1_TXD UART2_RXD UART2_TXD
C2
10pF/25V_DNI
C4 10pF/25V_DNI
GND
GND
R2 18R
Need Change to 18R
C8
4.7uF/6.3V
C6 1uF/6.3V
GND
C3 10uF/6.3V
GND
3.3V
C7
4.7uF/6.3V
GND GND
C10
1uF/6.3V
C9
2.2uF/6.3V
GND
PWM5
GND
L1
3.0nH
C11 1.0pF
C12 1.2pF/50VR3 0R/1%
C15 0.5pF/50V
GND
CEN
L2 3.6nH
C5 100pF/50V
TCK_F_SCK TMS_F_CSN TDI_F_SI TDO_F_SO
T
F_CSN1 TP
TMS_F_CSN
C1 0.1uF/10V
GND
C13 NC
C14 NC
GND GND
GND
P17 P15 P16 P14 P28
P9
PWM2
PWM1
PWM0
PWM5
PWM4
3.3V
8
8
9
9
10
10
11
11
12
12
GND
13
3V3
14
15
15
16
16
17
17
18
18
19
19
20
20
21
21
7
7
6
6
5
5
4
4
3
3
2
2
1
1
P1 Component_1
P9
P9/BT_PRIORITY/PWM3
25
P10/UART1_RXD
26
P11/UART1_TXD
27
P1/UART2_RXD/I2C2_SDA
28
P0/UART2_TXD/I2C2_SCL
29
XO
30
XI
31
VCCPLL
32
GND
33
P24/LPO_CLK/PWM4
16
P26/IRDA/PWM5
15
P17/SD_DATA0/SPI_MISO
14
P15/SD_DATA3/SPI_CSN
13
P16/SD_CMD/SPI_MOSI
12
P14/SD_CLK/SPI_SCK
11
P28/RX_EN/USBDN
10
VBAT
9
VDDAON
8
VDDDIG
7
VSYS
6
VCCIF
5
VCCTX
4
VCCPA
3
ANT
2
VCCRXFE
1
P8/BT_ACTIVE/PWM2
24
P7/WIFI_ACTIVE/PWM1
23
P6/CLK13M/PWM0
22
CEN
21
P20/I2C1_SCL/TCK
20
P21/I2C1_SDA/TMS
19
P22/XHOUT/TDI
18
P23/ADC3/TDO
17
U1 BK7231NQN32
GND
4
XI
1
XO
3
GND
2
Y1 XTAL_4PIN
GND
GND
GND
GND
XO XI XO
XI
1
2 3 4
P2 WI-FI_IPEX
GND
R5 0Ω
R6 0Ω
R5,R6 common pad
UART2_TXD UART2_RXD TDO_F_SO
UART1_TXD UART1_RXD CEN P28
P14 P15 P16 P17 TCK_F_SCK TDI_F_SI
SCK ADC IO IO
CS
IO ADC RST
NP
NP
RF
1
GND
2
ANT
MOSI MISO