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Summary of Contents for Espressif Systems ESP32-C3 Series
- Page 1 ESP32C3 Family Hardware Design Guidelines Prerelease version 0.5 Espressif Systems Copyright © 2021 www.espressif.com...
- Page 2 About This Document The guidelines outline recommended design practices when developing standalone or add-on systems based on the ESP32-C3 series of products, including ESP32-C3 SoCs, ESP32-C3 modules and ESP32-C3 development boards. Document Updates Please always refer to the latest version on https://www.espressif.com/en/support/download/documents.
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Page 3: Table Of Contents
EVM is relatively poor. 3.8.4 TX performance is not bad, but the RX sensitivity is low. 4 Hardware Development ESP32-C3-WROOM-1 Module ESP32-C3 family Development Boards Revision History Solutions, Documentation and Legal Information Espressif Systems ESP32-C3 Family Hardware Design Guidelines V0.5 Submit Documentation Feedback... - Page 4 ESP32-C3 Family Crystal Layout ESP32-C3 Family RF Layout in a Four-layer PCB Design ESP32-C3 RF Stub in a Four-layer PCB Design ESP32-C3 Family PCB Stack-up Design ESP32-C3 Family Flash Layout Espressif Systems ESP32-C3 Family Hardware Design Guidelines V0.5 Submit Documentation Feedback...
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Page 5: Overview
As such, the mass production of ESP32-C3 family does not require expensive and specialized Wi-Fi test equipment. For more information about ESP32-C3 family, please refer to ESP32-C3 Family Datasheet. Espressif Systems ESP32-C3 Family Hardware Design Guidelines V0.5 Submit Documentation Feedback... -
Page 6: Schematic Checklist
Highlights in ESP32-C3 family circuit design may be broken down into nine major sections: 10nF • Power supply 40MHz(±10ppm) • Power-on sequence and system reset • Flash • Clock source • RF • UART • ADC • Strapping pins • GPIO Espressif Systems ESP32-C3 Family Hardware Design Guidelines V0.5 Submit Documentation Feedback... -
Page 7: Power Supply
0.1 µF capacitor. In addition, a LC filter circuit needs to be added near pin 2 and pin 3 to suppress high-frequency harmonics. The inductor’s rated current is preferably 500 mA or above. Refer to Figure and place the appropriate decoupling capacitor near each analog power pin. Espressif Systems ESP32-C3 Family Hardware Design Guidelines V0.5 Submit Documentation Feedback... -
Page 8: Power-On Sequence And System Reset
This is achieved by delaying the activation of pin 7 CHIP_EN after the 3.3 V rails have been brought VDD33 Figure shows the power-up and reset timing of ESP32-C3 family. Details about the parameters are listed in Table 1. 10nF 40MHz(±10ppm) Espressif Systems ESP32-C3 Family Hardware Design Guidelines V0.5 Submit Documentation Feedback... -
Page 9: Reset
VDD_SPI. We recommend reserving a serial resistor (initially of 0 Ω) on the SPI line, to lower the driving current, adjust timing, reduce crosstalk and external interference, etc. Espressif Systems ESP32-C3 Family Hardware Design Guidelines V0.5 Submit Documentation Feedback... -
Page 10: Clock Source
VDD3P3_CPU SPIHD SPIWP /HOLD VDD33 FLASH-3V3 0.1uF ESP32-C3 VDD33 If using ESP32-C3FN4 or ESP32-C3FH4, Figure 6: Schematic for ESP32C3 Family’s Crystal external flash could be removed. 0.1uF XTAL_P Espressif Systems ESP32-C3 Family Hardware Design Guidelines V0.5 40MHz(±10ppm) Submit Documentation Feedback... -
Page 11: Rtc Clock (Optional)
• The parallel resistor R10 is used for biasing the crystal circuit (5 MΩ < R12 ⩽ 10 MΩ). In general, you do not need to populate R10. • If the RTC source is not required, then pin 4 (XTAL_32K_P) and pin 5 (XTAL_32K_N) can be used as general GPIOs. Espressif Systems ESP32-C3 Family Hardware Design Guidelines V0.5 Submit Documentation Feedback... -
Page 12: Uart
2.8 Strapping Pins Note: The content below is excerpted from Section Strapping Pins in ESP32-C3 Family Datasheet. ESP32-C3 family has three strapping pins: • GPIO2 • GPIO8 • GPIO9 • GPIO10 Espressif Systems ESP32-C3 Family Hardware Design Guidelines V0.5 Submit Documentation Feedback... - Page 13 The strapping combination of GPIO8 = 0 and GPIO9 = 0 is invalid and will trigger unexpected behavior. Figure shows the setup and hold times for the strapping pin before and after the CHIP_PU signal goes high. Espressif Systems ESP32-C3 Family Hardware Design Guidelines V0.5 Submit Documentation Feedback...
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Page 14: Gpio
IO MUX functions of each pin. For more information about IO MUX and GPIO matrix, please refer to Chapter IO MUX and GPIO Matrix (GPIO, IO_MUX) in ESP32-C3 Technical Reference Manual. Espressif Systems ESP32-C3 Family Hardware Design Guidelines V0.5 Submit Documentation Feedback... - Page 15 You may add pull-up and pull-down resistors in your PCB design referring to Table DC Characteristics (3.3 V, 25 °C) in ESP32-C3 Family Datasheet, or enable internal pull-up and pull-down resistors during software initialization. Notes Espressif Systems ESP32-C3 Family Hardware Design Guidelines V0.5 Submit Documentation Feedback...
- Page 16 • G - These pins have glitches during power-up. See details in Table 5. Table 5: PowerUp Glitches on Pins Typical Time Period Glitch (ns) MTCK Low-level glitch MTDO Low-level glitch GPIO10 Low-level glitch U0RXD Low-level glitch GPIO18 Pull-up glitch 50000 Espressif Systems ESP32-C3 Family Hardware Design Guidelines V0.5 Submit Documentation Feedback...
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Page 17: Pcb Layout Design
If you design an on-board module, please pay attention to the placement of the module on the base board. The aim is to minimize the impact of the base board on the module’s antenna performance. Espressif Systems ESP32-C3 Family Hardware Design Guidelines V0.5... - Page 18 Figure 12: Placement of ESP32C3 Modules on Base Board. Antenna Feed Point on the Right Base board Figure 13: Placement of ESP32C3 Modules on Base Board. Antenna Feed Point on the Left Espressif Systems ESP32-C3 Family Hardware Design Guidelines V0.5 Submit Documentation Feedback...
- Page 19 If there is base board under the antenna area, it is recommended to cut it off to minimize its impact on the antenna. When designing an end product, pay attention to the impact of enclosure on the antenna. Espressif Systems ESP32-C3 Family Hardware Design Guidelines V0.5...
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Page 20: Power Supply
3 (analog power supply pins) to the third and fourth layer through a via, and maintaining a keep-out area on other layers. Figure 16: ESP32C3 Family Stub in a Fourlayer PCB Design Espressif Systems ESP32-C3 Family Hardware Design Guidelines V0.5 Submit Documentation Feedback... -
Page 21: Crystal
• As the crystal is a sensitive component, do not place any magnetic components nearby that may cause interference (e.g. large inductance component), and ensure that around the crystal is a clean large ground plane. Espressif Systems ESP32-C3 Family Hardware Design Guidelines V0.5 Submit Documentation Feedback... - Page 22 A π-type matching circuit should be reserved on the RF trace and placed close to the chip. • The RF trace should have consistent width and not branch out. It should be as short as possible with dense ground vias around for inteference shielding. Espressif Systems ESP32-C3 Family Hardware Design Guidelines V0.5 Submit Documentation Feedback...
- Page 23 . • For designing the RF trace at 50 Ω single-ended impedance, please refer to the PCB stack-up design shown in Figure 20. Espressif Systems ESP32-C3 Family Hardware Design Guidelines V0.5 Submit Documentation Feedback...
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Page 24: Flash
The series resistor on the U0TXD line needs to be placed close to the chip and away from the crystal. The U0TXD and U0RXD traces on the top layer should be as short as possible, surrounded by ground copper and ground vias. Espressif Systems ESP32-C3 Family Hardware Design Guidelines V0.5 Submit Documentation Feedback... -
Page 25: Typical Layout Problems And Solutions
As TX and RX share the antenna path, good TX performance indicates proper RF impedance matching. The reason of low RX sensitivity might lie in coupling of high-frequency interference signals to the antenna. In this Espressif Systems ESP32-C3 Family Hardware Design Guidelines V0.5... - Page 26 PCB layout. Solution: Keep the antenna away from crystals. Do not route high-frequency signal traces close to the RF trace. For details, please see Section 3. Espressif Systems ESP32-C3 Family Hardware Design Guidelines V0.5 Submit Documentation Feedback...
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Page 27: Hardware Development
• The serial port cannot be used to print log and download firmware simultaneously. 4.2 ESP32C3 family Development Boards For latest information about ESP32-C3 development boards, please check Development Boards section of Espressif website. Espressif Systems ESP32-C3 Family Hardware Design Guidelines V0.5 Submit Documentation Feedback... -
Page 28: Revision History
Revision History Revision History Date Version Release notes 2021-04-09 V0.5 Preliminary release Espressif Systems ESP32-C3 Family Hardware Design Guidelines V0.5 Submit Documentation Feedback... -
Page 29: Solutions, Documentation And Legal Information
Sales and Technical Support • Sales Questions MustHave Resources • Technical Inquiries • SDKs and Demos • Get Samples • APPs Developer Zone • Tools • ESP32 Forum • Espressif Systems ESP32-C3 Family Hardware Design Guidelines V0.5 Submit Documentation Feedback... - Page 30 The Wi-Fi Alliance Member logo is a trademark of the Wi-Fi Alliance. The Bluetooth logo is a registered trademark of Bluetooth SIG. All trade names, trademarks and registered trademarks mentioned in this document are property www.espressif.com of their respective owners, and are hereby acknowledged. Copyright © 2021 Espressif Systems (Shanghai) Co., Ltd. All rights reserved.
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