Datasheet

6 Peripheral Schematics
6 Peripheral Schematics
This is the typical application circuit of the module connected with peripheral components (for example, power
supply, antenna, reset button, JTAG interface, and UART interface).
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
NC: No component.
IO4
IO5
IO6
IO7
IO1
IO19
IO10
IO2
RXD
IO3
TXD
IO0
IO18
EN
IO9
EN
IO8
TDI
TMS
TCK
TDO
USB_D-
USB_D+
GND
GND
GND
GND
GND
GND
VDD33
GNDVDD33
VDD33
VDD33
GND
GNDGND
C4 0.1uF
C2 0.1uF
R1 TBD
R2 0
C712pF(NC)
R6 0
C3 TBD
R9
10K
R5 0(NC)
C812pF(NC)
X1
32.768kHz(NC)
12
JP1
JTAG
1
1
2
2
3
3
4
4
JP2
Boot Option
1
1
2
2
SW1
R4 0
JP3
USB
1
1
2
2
R8 10K
C1 10uF
R7 NC
C6
TBD
C5
TBD
R3 0(NC)
U1
ESP32-C3-WROOM-02/ESP32-C3-WROOM-02U
3V3
1
EN
2
IO4
3
IO5
4
IO6
5
IO7
6
IO8
7
IO9
8
GND
9
IO10
10
RXD
11
TXD
12
IO18
13
IO19
14
IO3
15
IO2
16
IO1
17
IO0
18
EPAD
19
JP4
UART
1
1
2
2
3
3
4
4
Figure 7: Peripheral Schematics
• Soldering the EPAD to the ground of the base board is not a must, though doing so can get optimized thermal
performance. If you do want to solder it, please ensure that you apply the correct amount of soldering paste.
• To ensure the power supply to the ESP32-C3 family chip is stable 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
= 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 power-up and reset sequence timing diagram of
the ESP32-C3 family chip, please refer to Section Power Scheme in ESP32-C3 Family Datasheet .
Espressif Systems 25
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ESP32-C3-WROOM-02 & WROOM-02U Datasheet v0.7