Schematics

A
B
C
D
5 4 3 2 1
D
C
B
A
12345
C1
1uF
1
CHG
2
GND
3
BAT
4
VCC
5
PROG
U2TC4054
1
VDDIO
2
VBAT
3
LDO_IN/PB5
4
BT_AVDD
5
PB3_ADC6
6
PB1_ADC5
7
BT_RF
8
VSSIO
9
BT_OSCI
10
BT_OSCO
11
USBDM
12
PA3/ADC12/ USBDP
13
DACR
14
DACL
15
DACVSS
16
ADC11/MIC/ PC6
U1
AC6959B
+
1
1
2
2
SPK2
1
1
2
2
4
3
3
4
K2
C10
NC
C3
NC/10V
R3
330R
1
VCC
2
D-
3
D+
4
ID
5
GND
6
GND1
7
GND2
USB1
MicroUSB_5p
D3
BLUE
1
2
MIC1
D2
RED
R6
0R
R4
1.68K
+
1
1
2
2
SPK1
C15
NC/10V
1
2
3
4
Y1
24M/ 12pF/10PPM
C5
2.7pF
C11
10uF/6.3V/0805
L2
NC
C12
10uF/6.3V/0805
1
2
34
J1
Earphone_Socket
BT1
3.7V
D1
RED
C8
10uF/10V/0805
C4
1uF
L1
NC
1
2
SPK3
3_3V
TEST_DM
TEST_DP
DC_5V
DACR
LED_B/ R
BATT
DACL
BT_RF
GND_FIELD_SIGNAL
OSCO
OSCI
3_3V
BT_AVDD
DC_5V
DC_5V
DACR
DACR
LED_B/ R
BATT
DACL
DACL
P/ P/ POWER
TEST_DP
TEST_DP
MIC
GND_FIELD_SIGNAL
GND_FIELD_SIGNAL
GND_FIELD_SIGNAL
GND_FIELD_SIGNAL
GND
GND
TEST_DM
TEST_DM
3_3V
OSCI OSCO
LOUT
ROUT
P/ P/ POWER
TEST_DM
MIC