Schematics

AC6928
BT_OSCO
BT_OSCI
VSSIO
BT_RF
BT_AVDD
ADC12/PR2
ADC12/PR1
RTCVDD
VBAT
PWMH2H/ADC9/AUX0R/PB5VDDIO
DACVSS
VCOM
DACVDD
DACL
PA0/MIC/PA3/AUX1L/ADC0
USBDP/PA4/AUX1R/ADC1
USBDM/PC3/SD1DAT/ADC10
PC4/SD1CMD/ADC4
PC5/SD1CLK
1
2
3
4
5
6
7
8
9
10 11
12
13
14
15
16
17
18
19
20
U2
C2
105
C1
104
C13 105
C12 105
C11 105
12
3
Y1
24Mhz/12PF
+
-
C
N
2
GND
R
DP/GND
DM/L
V+
1
2
3
4
5
68
91
2
U
S
B
1
C7
105P
R17 NC C3 104P
C15 105P
R28 100K
+
-
C
N
1
VO2
GND
VDD
VO1-IN
+IN
BYPASS
SHUTDOWN
1
2
3
4 5
6
7
8
U1
LTK5128
LED2
B
D
P
D
M
B
Q3
3904
R9
10K
R11
1
0
R
B
Q2
3904
R8
10K
R10
10R
B
Q1
3904
R7
10K
R18
1
0
R
LED4
B
LED3
B
1 2 34 5
SW1
SW-SK-12D07
G
R
L
DET
1
2
3
4
PH1
R131K
C4
104P
R210K
LED7
B
LED6
B
LED5
B
C6 472P
R14 51K
R16 10K
LED1
C
5
1
u
F
R12 3.3K
R3 1K
CHRG
GND
BAT VCC
CHRG1
1
2
3 4
5
U3
TP4054
AD_KEY
BAT+
RTCVDD
BT_AVDD
BT_OSCI
BT_OSCOLEDB
LEDR
LEDG
AUX
DACL
DACVDD
VCOM
+3.3V
BT_OSCO BT_OSCI
BATT+
R+
R-
MUTE1
LEDG
AUX
B
LEDB
R
LEDR
G
LEDG
BAT+
BAT+
AD_KEY
AUX
B
R
G
DACL
BAT+
MUTE
DP
DC_5V