Table Of Contents - Espressif Systems ESP32 Hardware Design Manuallines

Contents
1 Overview
2 Schematic Checklist and PCB Layout Design
2.1 Schematic Checklist
2.1.1 Power Supply
2.1.1.1 Digital Power Supply
2.1.1.2 Analog Power Supply
2.1.2 Power-on Sequence and System Reset
2.1.2.1 Power-on Sequence
2.1.2.2 Reset
2.1.3 Flash
2.1.4 Crystal Oscillator
2.1.4.1 External Clock Source (Compulsory)
2.1.4.2 RTC (Optional)
2.1.5 RF
2.1.6 ADC
2.1.7 External Capacitor
2.1.8 UART
2.2 PCB Layout Design
2.2.1 Standalone ESP32 Module
2.2.1.1 General Principles of PCB Layout
2.2.1.2 Positioning a ESP32 Module on a Base Board
2.2.1.3 Power Supply
2.2.1.4 Crystal Oscillator
2.2.1.5 RF
2.2.1.6 External RC
2.2.1.7 UART
2.2.1.8 Touch Sensor
2.2.2 ESP32 as a Slave Device
2.2.3 Typical Layout Problems and Solutions
2.2.3.1 Q: The current ripple is not large, but the Tx performance of RF is rather poor.
2.2.3.2 Q: The power ripple is small, but RF Tx performance is poor.
2.2.3.3 Q: When ESP32 sends data packages, the power value is much higher or lower than the
target power value, and the EVM is relatively poor.
2.2.3.4 Q: Tx performance is not bad, but the Rx sensitivity is low.
3 Hardware Development
3.1 ESP32-PICO-D4 Module
3.2 ESP32-WROOM-32(ESP-WROOM-32) Module
3.3 ESP32-WROOM-32D(ESP-WROOM-32D) Module
3.4 ESP32-WROOM-32U Module
3.5 ESP32-WROVER Module
3.6 Notes on Using Modules
3.7 ESP32-DevKitC Development Board
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