Schematics

C
B
A
C
D
654321
D
B
A
•••
•••
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•••
D2
RED
D1
BLUE
C4
uj
X
26M
C5
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jXY
XW\
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uj
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Wy
jX\
XW\
C1
YY\
L1
XW|o
iR
iT
sR
C2
_UYw
sT
C3
_UYw
kw
0
E-GND
16
ADC10/MIC/PF2
9
BT_ANT
1
AGND
17
VCMBUF
19
VDDDAC
20
VDDPA
8
PWRKEY
4
VBAT
5
LX
18
DACL#/VCMBUF
15
ADC2/PA7
14
ADC5/PB3
13
ADC6/PB4
11
BT_OSCI
12
BT_OSCO
10
BTAVDD
7
VDDBT
6
DGND
2
VUSB
3
VDDIO
U3
AB5376A2 QFN20
R2
WyV uj
kjR
kjT
yZ
ZUZr
1
1
2
2
3
3
ANT
j`
XW[
12
MIC
GND
C6
X]y
C7
XrgXWWto
CHRG_LED
VUSB
CHRG_LED
PWRKEY
VBAT
DACL
khjsJ
BLUE_LED
DACL
DACL#
MICIN
BLUE_LED
VDDBT
VDDIO
VBAT
VDDBT
VDDDAC
VUSB
MICIN
PWRKEY