Espressif Systems ESP32-C3 Series, Руководство по проектированию аппаратного обеспечения, Страница: 3 / 30

Contents
Contents
1 Overview
4
2 Schematic Checklist
5
2.1 Power Supply 6
2.1.1 Digital Power Supply 6
2.1.2 Analog Power Supply 6
2.2 Power-on Sequence and System Reset 7
2.2.1 Power-on Sequence 7
2.2.2 Reset 8
2.3 Flash 8
2.4 Clock Source 9
2.4.1 External Clock Source (compulsory) 9
2.4.2 RTC Clock (optional) 10
2.5 RF 11
2.6 UART 11
2.7 ADC 11
2.8 Strapping Pins 11
2.9 GPIO 13
3 PCB Layout Design
16
3.1 General Principles of PCB Layout 16
3.2 Placement of Module on the Base Board 16
3.3 Power Supply 19
3.4 Crystal 20
3.5 RF 21
3.6 Flash 23
3.7 UART 23
3.8 Typical Layout Problems and Solutions 24
3.8.1 Ripple in the power supply is not large, but the RF transmit (TX) performance is rather poor. 24
3.8.2 Ripple in power supply is small during packet transmission, but RF TX performance is still poor. 24
3.8.3 When ESP32-C3 family transmits data packets, the measured power is much higher or lower
than the target power, and the EVM is relatively poor. 24
3.8.4 TX performance is not bad, but the RX sensitivity is low. 24
4 Hardware Development
26
4.1 Modules Built around ESP32-C3 Family of Chips 26
4.2 Development Boards Built around ESP32-C3 Family of Chips 26
Revision History
27
Solutions, Documentation and Legal Information
28
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ESP32-C3 Family Hardware Design Guidelines V1.0