2. Schematic Checklist and PCB Layout Design
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
The capacitance of C1 and C2 varies
with the selection of the crystal.
SENSOR_VP
SENSOR_VN
GPIO32
GPIO33
CHIP_PU
GPIO35
SCK/CLK
SCS/CMD
SENSOR_VP
SHD/SD2 SWP/SD3
SDI/SD1
SDO/SD0
SENSOR_VN
GPIO34
GPIO26
GPIO27
GPIO14
GPIO12
GPIO2
GPIO15
GPIO0
GPIO18
GPIO2
U0TXD
U0RXD
GPIO22
GPIO21
GPIO4
GPIO19
SHD/SD2
SWP/SD3
SCS/CMD
SCK/CLK
SDO/SD0
SDI/SD1
GPIO23
CHIP_PU
GPIO34
GPIO35
GPIO25
GPIO26
GPIO27
GPIO14
GPIO12
GPIO13
GPIO0
GPIO15
GPIO4
GPIO16
GPIO5
GPIO17
GPIO32
GPIO33
GPIO21
U0TXD
U0RXD
GPIO25
GPIO13
GPIO16
SDI/SD1
SDO/SD0
SCK/CLK
SCS/CMD
SWP/SD3
SHD/SD2
GPIO5
GPIO18
GPIO23
GPIO17
GPIO19
GPIO22
GND
VDD33
GND
VDD33
GND
GND
GND
VDD33
GND
GND
VDD_SDIO
GND
VDD_SDIO
GND
GND
GND
GNDGND
GND
VDD33
VDD33
GND
GNDGND
GND
GND
GND
GND GND
VDD33
GND
GND
Title
Size
Document Number Re v
Date: Sheet o f
<Doc>
ESP-WROOM-32-5X5
A2
1 1Tuesday, July 03, 2018
Title
Size
Document Number Re v
Date: Sheet o f
<Doc>
ESP-WROOM-32-5X5
A2
1 1Tuesday, July 03, 2018
Title
Size
Document Number Re v
Date: Sheet o f
<Doc>
ESP-WROOM-32-5X5
A2
1 1Tuesday, July 03, 2018
L5
2.0nH
R1 20K(5%)
C13
10uF
U3 FLASH
/CS
1
DO
2
/WP
3
GND
4
DI
5
CLK
6
/HOLD
7
VCC
8
J30
CON1
1
J23
CON1
1
C5
10nF/6.3V(10%)
C14
TBD
J26
CON1
1
J31
CON1
1
C6
3.3nF/6.3V(10%)
D1
ESD3.3V88D-LCDN
C9
0.1uF
J4
CON1
1
R3 499R
C11
1uF
J22
CON1
1
J14
CON1
1
J35
CON1
1
C15
TBD
J36
CON1
1
J12
CON1
1
ANT1
PCB ANT
1
2
C16
270pF(NC)
J7
CON1
1
J25
CON1
1
J21
CON1
1
J6
CON1
1
J33
CON1
1
J17
CON1
1
J32
CON1
1
C17
270pF(NC)
J10
CON1
1
J1
CON1
1
J15
CON1
1
J3
CON1
1
J24
CON1
1
J37
CON1
1
J27
CON1
1
J2
CON1
1
U2 ESP32-D0WD
VDDA
1
LNA_IN
2
VDD3P3
3
VDD3P3
4
SENSOR_VP
5
SENSOR_CAPP
6
SENSOR_CAPN
7
SENSOR_VN
8
CHIP_PU
9
VDET_1
10
VDET_2
11
32K_XP
12
32K_XN
13
GPIO25
14
GPIO26
15
GPIO27
16
MTMS
17
MTDI
18
VDD3P3_RTC
19
MTCK
20
MTDO
21
GPIO2
22
GPIO0
23
GPIO4
24
VDD_SDIO
26
GPIO16
25
GPIO17
27
SD_DATA_2
28
SD_DATA_3
29
SD_CMD
30
SD_CLK
31
SD_DATA_0
32
GND
49
SD_DATA_1
33
GPIO5
34
GPIO18
35
GPIO19
38
CAP2
47
VDDA
43
XTAL_N
44
XTAL_P
45
GPIO23
36
U0TXD
41
GPIO22
39
GPIO21
42
VDD3P3_CPU
37
CAP1
48
VDDA
46
U0RXD
40
C20
1uF
L4 TBD
C1
TBD
C18
1uF
J20
CON1
1
J16
CON1
1
J5
CON1
1
C12
NC
U1
40MHz+/-10ppm
XIN
1
GND
2
XOUT
3
GND
4
C21
NC
J29
CON1
1
J8
CON1
1
J13
CON1
1
C2
TBD
J19
CON1
1
J9
CON1
1
C4
0.1uF
C10
0.1uF
C3
100pF
J34
CON1
1
C19
0.1uF
J11
CON1
1
J38
CON1
1
R2
0R
J28
CON1
1
J18
CON1
1
Figure 5: ESP32 Crystal Oscillator
Notice:
• If an oscillator is used, its output should be connected to XTAL_P on the chip. Please make sure that the oscillator
output is stable and its accuracy is within ± 10 ppm. It is also recommended that the circuit design for the oscillator
is compatible with the use of crystal, in case that if there is a defect in the circuit design, users can still use the
crystal.
• Defects in the craftsmanship of the crystal oscillators (for example, frequency deviation more than ±10 ppm) and
unstable operating temperature may lead to the malfunction of ESP32, resulting in a decrease of the overall per-
formance.
2.1.4.2 RTC (Optional)
ESP32 supports an external 32.768 kHz crystal or an external 32.768 kHz signal (e.g., an oscillator) to act as the
RTC sleep clock.
Figure 6 shows the schematic for the external 32.768 kHz crystal.
GPIO35
GPIO33
GPIO25
GPIO32
GND
GND
R4
TBD
C23 TBD
U4
32.768KHz
XTAL32_IN
1
XTAL32_OUT
2
C22 TBD
U2
VDET_1
VDET_2
11
32K_XP
12
32K_XN
13
GPIO25
14
Figure 6: Schematic for ESP32’s External Crystal (RTC)
Espressif Systems 6 ESP32 Hardware Design Guidelines V2.7
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