Schematics

BAT+
BAT-
1
SPR+
1
SPR-
1
SPL+
1
SPL-
1
VCC
2
D-
3
D+
4
NC
5
GND
6
7 8
9
USB2
1
A
2
K
LED2
RED
1
A
2
K
LED3
B
1
BT-ANT
ANT
1
2
34
S1
POW
C11 102*
MIC+
MIC-
1 2
C7
105
C1
105
C6
2P7
C8
105
C9
105
C4
105
L3
NC
C5
105
1
DACVSS
2
AVDD
3
VDDIO
4
PB8
5
PB7/AUX0R/ADC9
6
PB6/AUX0L/ADC8
7
PGND
8
SW
9
VBAT
10
LDO_IN
11
BT_AVDD
12
PB3/OSC32KI
13
PB2/OSC32KO/ADC12
14
PB1/ADC6
15
PB0
16
BT_RF
17
VSSIO
18
OSCI
19
OSCO
20
ADC5/SD1CLK/PA10
21
ADC4/SD1CMD/PA9
22
SD1DAT/PA8
23
DVDD
24
ADC11/DM
25
ADC10/DP
26
AC2/AUX1R/PA4
27
ADC0/MIC/PA1
28
DACR
29
DACL
30
VCOMO
31
DACVDD
32
VCOM
U1
AC6956
C2
NC
C3
105
1
DP
1
DM
C10 104
R1 1R
1
2
3
4
Y1
1
3
2
Q3
*2301
1
2
3
Q2
*3904
1
2
3
Q1
*3904
1 2 R3 *22K
12
R4*10K
1 2
Z1
*5V1
1 2 R5 *3K
1 2
R6 *6K8
1 2
R2 0R*
KEY0_PWR
DACL
DACR
BAT+
MIC
R_LED
B_LED
LDOIN
VCOMO
MIC_BIAS
MIC
DACR DACL
VCOMO
R_LED
B_LED
BAT+
LDOIN
KEY1
KEY0_PWR
KEY2
SD_CLK/AUX_DET
SD_CMD
SD_DAT
DP
VCOM DACVDD
DVDD
TFT_VDD
MIC_BIAS
LDOIN
24 MHz