Schematics

C
B
A
C
D
6 5 4 3 2 1
D
B
A
BAT
MCU
LED
ISP
KEY
1
VDDIO/VBAT
2
PB1/ADC7
3
VSS
4
BT_RF
5
BT_OSCI
6
BT_OSCO
7
USBDM
8
USBDP/PA6
U2
AC6368
1 3
2 4
Y1
24Mhz
1
1
2
2
BAT
CON-2
S1
SW4*4*2.0
S2
SW4*4*2.0
D1
BLUE
R1
200R
ANT1
C1
105/10V
1
J1
1
J2
1
J3
1
J4
1
SW1
2
SW2
3
SW3
4 5
SW1
SW-5PIN
VMCU
KEY1 USB_DM
USB_DP
VBAT
USB_DP
USB_DM
KEY1
USB_DM
VBAT
USB_DP
VBAT
VMCU