Schematics

5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
ADKEY
BT_RF DC-DET
DP
VCOM
DACL
+3.3V
BT_OSCO
BT_RF
MIC
DM
DP
VBATIN
SP-
DACL
SP+
VBAT VCC+5V
GND
+3.3V
VBAT
VBAT
ADKEY
VBATIN
LED
LEDBT_OSCI
VBATIN
DC-DET
VCC+5V
U1
LP4068B5F
1
2
3
5
4
CHRG
GND
BT
PROG
VCC
J2
1
2
3
4
NC
$PIN1
$PIN2
$PIN3
105
C2
R10
10K
U6
8002
1
2
3
4
8
7
6
5
MUTE
Bypass
IN+
IN-
OUT+
GND
VDD
OUT-
DM1
R6
1K
R15
10K
D1
B_LED
12
2.7PC13
VBAT1
NC C18
106
C12
R8
1K
J4
4013
1
2
R12
10K
R3
10K
105
C6
473
C8
B-1
NC C15
R2
2K
R1
2K7
D2
R_LED
12
SP+1
105
C14
104C5
C3
105
R7
NC
R14
NC
+
C11 NC
IC1
AC6969D
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
LDO_IN/PB5
VBAT
VDDIO
PB1/ADC5
FMIP
BT_RF
BT_OSCI
BT_OSCO
DACL
VCOM
VSSIO
PA1/PA0
ADC3/PA4/USBDP
ADC14/SD0DAT/PC3/USBDM
ADC11/SD0CMD/PC4
ADC12/SD0CLK/PC5
105
C1
D3
RED_LED
R4
NC
R5 1M
105
C7
J1
USB2.0
6 7 8
9
5
4
3
2
1
6 7 8
9
BT-ANT1
R9 NC
SP-1
R17
47K
R11
47K
+
C10 NC
DP1
R13
NC
C16
NC
C4
105
105
C9
C30 NC
R16 10K
U2
RY2201
1 2 3
5 4
GND GND
VDD
VM VM
24MHZ
Y1
NC C17
Q12301
1
32