External Capacitor; Uart; Esp32 Uart - Espressif Systems ESP32 Hardware Design Manuallines
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Also See for ESP32:
- Technical reference manual (126 pages) ,
- Instruction set (103 pages) ,
- Hardware design manuallines (44 pages)
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2. SCHEMATIC CHECKLIST AND PCB LAYOUT DESIGN
circuit or avoid using them in software.
2.1.7 External Capacitor
The schematics of Pin47 CAP2 and Pin48 CAP1 is shown in Figure 8. C5 (10 nF) that connects to CAP1 should
be of high precision. For the RC circuit between CAP1 and CAP2 pins, please refer to Figure 8. Removing the RC
circuit may slightly affect ESP32 in Deep-sleep mode.
2.1.8 UART
Users need to connect a 499Ω resistor to the U0TXD line in order to suppress the 80 MHz harmonics.
Espressif Systems
GND
R1
C5
C6
10nF
GND
Figure 8: ESP32 External Capacitor
R3
499R
Figure 9: ESP32 UART
13
20K
3.3nF
U0TXD
U0RXD
GPIO22
ESP32 Hardware Design Guidelines V2.1
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