Schematics

1 2 3 4
A
B
C
D
4321
D
C
B
A
+ BAT
BAT
VBAT
C1
1UF
LED1
RED
1
2
3
4
5
6
7
8 9
10
11
12
13
14
15
16
U1
ST17H26
R1
NC
R2
NC
C2
1UF
C3
1UF
SW1
SW
X1
12MHz
VBAT
L1
0R
C4
NC
C5
NC
A1
ANTENNA
P1
VPP
P2
SWS
P3
LED
P4
VDD
P5
GND
VBAT
LED
LED
SWS
SWS
VPP
VPP