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Appendix A
A.
Appendix - Schematics
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5
5
4
4
3
3
2
2
1
1
D
D
C
C
B
B
A
A
ESP32
Pow
er
Blo
ck:
Sys
tem
Blo
ck:
DS
P
CX
20
92
1
Co
de
c
CX
22
72
1
MI
C*
2
Ke
y
s
SP
K*
2
EN
Ke
y
RS
T
BO
OT
Ke
y
BO
O
T
US
B
to UA
R
T
TX
/R
X
US
B
CN
N
D+
/D
-
Ke
y*
4
CN
N(
Re
se
rv
e
d
fo
r
LE
D,
Ke
y,
MI
C)
I2
C&
AD
C
MI
C
OU
T+
/
-
IN
T+
RS
T+
I
2
C
+I
2S
_C
X_
T
X
IR
Q+
EA
PD
+
I
2
C
+I
2S
_E
SP
_
T
X
I2
S_
AE
C
VCC
AP7361C
-
3
3
-ER-
7
/
1
3
US
B
CN
N
ESP32
3.3
V
LDO
3.3
V
DSP CX2
0
9
2
1
3.3
V
Codec CX2
2
7
2
1
LDO
LDO
1.8
V
VCC
Ti
tle
Size
Doc
umen
t
Numb
er
Re
v
Da
te
:
Sh
e
e
t
of
<01_
B
loc
k>
1.3
ESP32-
LYR
ATD-SYN
A
C
1
6
F
rid
ay
, Augus
t 3
0,
20
19
Ti
tle
Size
Doc
umen
t
Numb
er
Re
v
Da
te
:
Sh
e
e
t
of
<01_
B
loc
k>
1.3
ESP32-
LYR
ATD-SYN
A
C
1
6
F
rid
ay
, Augus
t 3
0,
20
19
Ti
tle
Size
Doc
umen
t
Numb
er
Re
v
Da
te
:
Sh
e
e
t
of
<01_
B
loc
k>
1.3
ESP32-
LYR
ATD-SYN
A
C
1
6
F
rid
ay
, Augus
t 3
0,
20
19
Espressif
!
/
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11 17
2019.09