Schematics

A3
11ofSheetDate:
Size
Title
LED
VDDIO
KEY
A
B
C
D
54321
D
C
B
A
12345
C7
NC
VBAT
GND
R10
2.2K
B-
C11
222/16V
4
PB9/SD0CLKB/AUX2L
5
PB8/SD0DATB/AUX1R/ADC8
2
PB11/SD_PWR
25
ADC2/PA6
14
PB0
3
PB10/SD0CMDB/AUX2R/ADC9
7
PGND
8
NC
6
VBAT
10
BT_AVDD
11
VDDIO
12
PB3/ADC6
13
PB1/ADC5
15
NC
16
BT_RF
17
VSSIO
18
BT_OSCI
19
BT_OSCO
20
ADC13/SD1CLK/PC5
21
ADC10/SD1CMD/PC4
22
DVDD
23
USBDM
24
ADC12/USBDP
26
ADC1/PA5
27
ADC0/AUX0R/MIC/PA1/PC6
28
DACR
29
DACL
33
PAD
30
VCOMO
31
DACVDD
32
NC
1
DACVSS
9
LDO_IN/PB5
U1
LC6956A-QFN32
Y1 24MHz/10PPM
R+
C4
105/16V
C10
105/16V
R12
2R7/0603
L-
VDDIO
1
VBUS
2
D-
3
D+
4
ID
5
GND
6
S1
7
S2
9
S3
8
S4
USB1
Micro-USB
LED1 BLUE LED2 RED
L4 120nH
C9
105/16V
C23
105/16V
DM
C1 2.7P
B+
C3
NC
C2
NC
L2 120nH
1
2
MIC1
MIC-4013
R2
NC
R-
L+
C17
NC
C13
105
L1 120nH
DP
R1
NC
C20 104
4
G
3
R
2
L
5
1
DET
6
J1
JACK-SMD-A
R3
10K
G
R
B
LED3
RGB5050
R5
33R
LEDB-
1
B
2
E
3
C
Q1
9014
R9
1K
R15
10K
C6
106/10V
1
VBAT1
BT_ANTENNA_5
BT_ANT
R7
NC
LED+
LEDB-1
LED+1
C14
106/10V
K1
WKUP
K2
PREV/V-
K3
NTXT/V+
R8
100K
LEDB/R
OSC24MI OSC24MO
BT-ANT-IC
DM
DP
DACL
DACR
VCOMO
NEXT/V+
WKUP
PREV/V-
MIC
WKUP
DACL
MIC
DP
DM
VCOM
BT-ANT-IC
OSC24MI
OSC24MO
DACR
VCOMO
NEXT/V+
PREV/V-
GND
GND
GND
3V3
GND
VBAT
DACVDD
VBAT
GND
DC+5V
VBAT
GND
GND
3V3
GND
DC+5V
GND
VBAT
BT_AVDD
3V3
GND
DVDD
GND
SD_PWR
DC+5V
DVDD
GND
DACVDD
GND
GND
BT_AVDD
3V3
LEDB/R
DC-EN
AUX-DET
LED-B
VBAT
AUX-DET
LEDB
LEDB
GND
LED-B
GND
LEDB
GND
LC6956A
3.3V
DACVDD