Datasheet
Table Of Contents
7. Peripheral Schematics
7. Peripheral Schematics
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
Espressif Systems
MTDI should be kept at a low electric level when powering up the module.
EN
TXD
RXD
IO0
MTMS
MTDI
MTCK
MTDO
IO23
IO22
IO21
IO19
IO18
IO5
IO4
IO2
SD2
SD3
CMD
CLK
SD0
SD1
SENSOR_VP
SENSOR_VN
IO34
IO35
IO32
IO33
IO25
IO26
IO27
IO17
IO16
VDD33
GND
VDD33
GND
GND
GND
GND
GND
GND
Title
Size
Document Number Rev
Date: Sheet o f
<Doc> 1.0
Application of ESP32-WROOM-32
A4
1 1Wednesday, August 07, 2019
Title
Size
Document Number Rev
Date: Sheet o f
<Doc> 1.0
Application of ESP32-WROOM-32
A4
1 1Wednesday, August 07, 2019
Title
Size
Document Number Rev
Date: Sheet o f
<Doc> 1.0
Application of ESP32-WROOM-32
A4
1 1Wednesday, August 07, 2019
R2 100R
R4 100R
C1 10uF
U2
JTAG
MTMS
1
MTDI
2
MTCK
3
MTDO
4
U1
GND1
1
3V3
2
EN
3
SENSOR_VP
4
SENSOR_VN
5
IO34
6
IO35
7
IO32
8
IO33
9
IO25
10
IO26
11
IO27
12
IO14
13
IO12
14
GND3
38
IO23
37
IO22
36
TXD0
35
RXD0
34
IO21
33
NC
32
IO19
31
IO18
30
IO5
29
IO17
28
IO16
27
IO4
26
IO0
25
GND2
15
IO13
16
SD2
17
SD3
18
CMD
19
CLK
20
SD0
21
SD1
22
IO15
23
IO2
24
P_GND
39
R1
TBD
C3 TBD
J1
UART DOWNLOAD
1
2
3
R3 100R
R5 100R
C2 0.1uF
J2
BOOT OPTION
1
2
Figure 4: ESP32-WROOM-32 Peripheral Schematics
Note:
• Soldering Pad 39 to the Ground of the base board is not necessary for a satisfactory thermal performance. If users
do want to solder it, they need to ensure that the correct quantity of soldering paste is applied.
• To ensure the power supply to the ESP32 chip during power-up, it is advised to add an RC delay circuit at the
EN pin. The recommended setting for the RC delay circuit is usually R = 10 kΩ and C = 0.1 µF. However, specific
parameters should be adjusted based on the power-up timing of the module and the power-up and reset sequence
timing of the chip. For ESP32’s power-up and reset sequence timing diagram, please refer to Section Power Scheme
in ESP32 Datasheet.
VCC
GND
GND
GND
VDD33
GND
ESP Module
Discharge Circuit CAP Added By User
Q1
R1
100K
D1SW1
1 2
R2
1K
+
C1
Bulk CAP
Figure 5: Discharge Circuit for VDD33 Rail
Espressif Systems 14 ESP32-WROOM-32 Datasheet V2.9