Schematics

1 2 3 4 56
A
B
C
D
6
54321
D
C
B
A
Y1
24Mhz 12pF
ANT
C3
1.5pF
C8
0.1uF
C4
22pF
C11
22pF
C7
1uF
C9
1uF
C5
0.1uF
C2
1uF
L1
NC
A0
1
VCC
8
A1
2
WP
7
A2
3
SCL
6
GND
4
SDA
5
U2
24C128
R4
2K
R5
2K
C6
0.1uF
VDDIO
SCL
SDA
S1
4*4*1.7
GPIO31
LED1
CAP
SW1
SW SPDT
1
2
BAT
2.54*2
R3
2K
C1
1uF
C10
0.1uF
Connect
3.3V
NC
1
DVDD
2
USB_DP
3
USB_DN
4
GPIO17
5
GPIO18
6
GPIO19
7
GPIO20
8
GPIO21
9
GPIO22
10
GPIO23
11
GPIO24
12
GPIO25
13
GPIO26
14
GPIO27
15
RSTN
16
VIO
17
GPIO28
18
GPIO29
19
GPIO30
20
GPIO31
21
I2C_SCL
22
I2C_SDA
23
VDDLPM
24
XTALOUT
25
XTALIN
26
ICE
27
SCANMODE
28
NC
29
NC
30
NC
31
RFN
32
NC
33
GPIO0
34
GPIO1
35
VPP
36
GPIO2
37
GPIO3
38
GPIO4
39
GPIO5
40
GPIO6
41
GPIO7
42
GPIO8
43
GPIO9
44
GPIO10
45
GPIO11
46
GPIO12
47
GPIO13
48
GPIO14
49
GPIO15
50
GPIO16
51
HVIN
52
HVOUT
53
VIN
54
VINPA
55
VINLPM
56
U1
YC1026
C8
C9
C10
C11
C12
C13
C15
C16
C17
LED2 LED3 GPIO31 SCL SDA ICE
R0
R1
R2
R3
R4
R5
R6
R7
VPP
C2 C3 C4 C5 C6 C7
VDDIOVIN
VDDIO
VIN
R6
0R
C14
LED2
BT
R1
470R
R2
470R
LED3
LED2
LED
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
R3 R0 R2 R1 R4 R5 R6 R7 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 C12 C13 C14 C15 C16 C17
L2
NC