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Espressif Systems ESP32-H2 Series Hardware Design Manuallines

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ESP32-H2 Series
Hardware Design Guidelines
Introduction
Hardware design guidelines give advice on how to integrate ESP32-H2 into other products.
ESP32-H2 is a series of ultra-low-power SoCs with support for Bluetooth
Mesh, Thread, Matter and Zigbee.
These guidelines will help to ensure optimal performance of your product with respect to tech-
nical accuracy and conformity to Espressif's standards.
www.espressif.com
®
5 (LE), Bluetooth
Pre-release v0.5
Espressif Systems
Copyright © 2023

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Summary of Contents for Espressif Systems ESP32-H2 Series

  • Page 1 ESP32-H2 Series Hardware Design Guidelines Introduction Hardware design guidelines give advice on how to integrate ESP32-H2 into other products. ® ESP32-H2 is a series of ultra-low-power SoCs with support for Bluetooth 5 (LE), Bluetooth Mesh, Thread, Matter and Zigbee. These guidelines will help to ensure optimal performance of your product with respect to tech- nical accuracy and conformity to Espressif’s standards.

  • Page 2: Table Of Contents

    EVM is relatively poor. 3.8.4 Q: TX performance is not bad, but the RX sensitivity is low. Hardware Development ESP32-H2 Modules ESP32-H2 Development Boards Download Guidelines Related Documentation and Resources Espressif Systems ESP32-H2 Series Hardware Design Guidelines v0.5 Submit Documentation Feedback...
  • Page 3 Contents Glossary Revision History Espressif Systems ESP32-H2 Series Hardware Design Guidelines v0.5 Submit Documentation Feedback...
  • Page 4 ESP32-H2 Crystal Oscillator Layout (Not Connected to the Ground) ESP32-H2 RF Layout in a Four-layer PCB Design ESP32-H2 PCB Stack up Design ESP32-H2 Stub in a Four-layer PCB Design ESP32-H2 UART0 Layout Espressif Systems ESP32-H2 Series Hardware Design Guidelines v0.5 Submit Documentation Feedback...

  • Page 5: Overview

    RF subsystem, including a antenna switch, RF balun, power amplifier, low noise amplifier (LNA), filter, power management unit, calibration circuits, etc. As a result, PCB size has been greatly reduced. With its advanced calibration circuitry, ESP32-H2 series can dynamically adjust itself to remove external circuit imperfections or adapt to changes in external conditions.

  • Page 6: Schematic Checklist

    Any basic ESP32-H2 circuit design may be broken down into 10 major sections: • Power supply • UART • Power-on sequence and system reset • Strapping pins • Flash • GPIO • Clock source • ADC • RF • USB Espressif Systems ESP32-H2 Series Hardware Design Guidelines v0.5 Submit Documentation Feedback...

  • Page 7: Power Supply

    If VBAT is powered separately by an external power supply, R2 is not required and the operating voltage range is 3.0 V to 3.6 V. Espressif Systems ESP32-H2 Series Hardware Design Guidelines v0.5 Submit Documentation Feedback...

  • Page 8: Power-Up Timing And System Reset

    0.25 × VDD) V. To avoid reboots caused by external interferences, make the CHIP_EN trace as short as possible. Also, add a pull-up resistor as well as a capacitor to ground whenever possible. More details can be found in Section 2.2.3. Espressif Systems ESP32-H2 Series Hardware Design Guidelines v0.5 Submit Documentation Feedback...

  • Page 9: Power-Up And Reset Timing

    IC is suggested to be around 3.0 V. 2.3 Flash ESP32-H2 series of chips have in-package 2 MB or 4 MB flash. The pins for flash are not bonded out. 2.4 Clock Source ESP32-H2 has two clock sources: •...

  • Page 10: Schematic For The Crystal

    ESP32-H2, resulting in a decrease of the RF performance. • It is recommended that the amplitude of the crystal is greater than 500 mV. Espressif Systems ESP32-H2 Series Hardware Design Guidelines v0.5 Submit Documentation Feedback...

  • Page 11: Rtc Clock(Optional)

    • If the RTC clock is not required, then the pins for the external 32.768 kHz crystal can be used as other GPIOs. 2.5 RF The RF circuit of the ESP32-H2 series of chips is mainly composed of three parts, the RF traces on the PCB board, the chip matching circuit, the antenna and the antenna matching circuit.

  • Page 12: Uart

    CHIP_EN RF tuning of PCB board, which depends greatly on the antenna and PCB layout. For ESP32-H2 series of chips, it is recommended to set the S11 parameter in the figure below to 35+j5 Ω and the center frequency is 2442 MHz.

  • Page 13: Strapping Pins

    Table 3: Description of Timing Parameters for the Strapping Pins Parameter Description Min (ms) Setup time before CHIP_EN goes from low to high Hold time after CHIP_EN goes high Espressif Systems ESP32-H2 Series Hardware Design Guidelines v0.5 Submit Documentation Feedback...

  • Page 14: Gpio

    Please do not add high-value capacitors at GPIO9, otherwise the chip not boot successfully. 2.8 GPIO The pins of ESP32-H2 series can be configured via IO MUX or GPIO matrix. IO MUX provides the default pin configurations, whereas the GPIO matrix is used to route signals from peripherals to GPIO pins. For more...
  • Page 15 If any of the two pull-up values is 1, the pin’s pull-up resistor will be enabled. The pull-up resistors of USB pins are controlled by the USB_SERIAL_JTAG_DP/DM_PULLUP bit, and the pull-up value is Espressif Systems ESP32-H2 Series Hardware Design Guidelines v0.5 Submit Documentation Feedback...

  • Page 16: Adc

    0 Ω) and a capacitor to ground (initially optional), and place them near the ESP32-H2 chip. ESP32-H2 also supports downloading and log printing through USB. For instructions on download over USB, please refer to Section 4.3. Espressif Systems ESP32-H2 Series Hardware Design Guidelines v0.5 Submit Documentation Feedback...

  • Page 17: Pcb Layout Design

    • Layer 2 (BOTTOM): Do not place any components on this layer and keep traces to a minimum. Please make sure there is a complete GND plane for the chip, RF, and crystal. Espressif Systems ESP32-H2 Series Hardware Design Guidelines v0.5 Submit Documentation Feedback...

  • Page 18: Positioning A Module On A Base Board

    ✓ Feed Point Base board ✓ Figure 11: Placement of ESP32-H2 Modules on Base Board (antenna feed point on the right) Espressif Systems ESP32-H2 Series Hardware Design Guidelines v0.5 Submit Documentation Feedback...

  • Page 19: Placement Of Esp32-H2 Modules On Base Board (Antenna Feed Point On The Left)

    If there is a base board under the antenna area, it is recommended to cut it off to minimize its impact on the antenna. Figure shows the suggested clearance for modules whose antenna feed point is on the left. Espressif Systems ESP32-H2 Series Hardware Design Guidelines v0.5 Submit Documentation Feedback...

  • Page 20: Power Supply

    As a conclusion, please be noted it is necessary to test the throughput and communication signal range of the whole product to ensure the product’s actual RF performance. 3.3 Power Supply Figure 14: ESP32-H2 Power Traces in a Four-layer PCB Design Espressif Systems ESP32-H2 Series Hardware Design Guidelines v0.5 Submit Documentation Feedback...

  • Page 21: Crystal

    • There should be no vias for the clock input and output traces, which means the traces cannot cross layers. • Components in series to the crystal trace should be placed close to the chip side. Espressif Systems ESP32-H2 Series Hardware Design Guidelines v0.5 Submit Documentation Feedback...

  • Page 22: Esp32-H2 Crystal Oscillator Layout (Connected To The Ground)

    Figure 15: ESP32-H2 Crystal Oscillator Layout (Connected to the Ground) Espressif Systems ESP32-H2 Series Hardware Design Guidelines v0.5 Submit Documentation Feedback...

  • Page 23: Esp32-H2 Crystal Oscillator Layout (Not Connected To The Ground)

    π-type matching circuit should be added on the RF trace and placed close to the chip, in a zigzag. • For designing the RF trace at 50 Ω impedance, you could refer to the PCB stack-up design shown in Figure Espressif Systems ESP32-H2 Series Hardware Design Guidelines v0.5 Submit Documentation Feedback...
  • Page 24 USB port, USB-to-serial chip, UART signal lines (including traces, vias, test points, header pins, etc.) must be as far away from the antenna as possible. The UART signal line should be surrounded by ground copper and ground vias. Espressif Systems ESP32-H2 Series Hardware Design Guidelines v0.5 Submit Documentation Feedback...

  • Page 25: Uart

    • Please use differential pairs and route them in parallel at equal lengths. • Make sure there is a complete reference ground plane and surround the USB traces with ground copper. 3.8 Typical Layout Problems and Solutions Espressif Systems ESP32-H2 Series Hardware Design Guidelines v0.5 Submit Documentation Feedback...

  • Page 26: Q: The Voltage Ripple Is Not Large, But The Tx Performance Of Rf Is Rather Poor

    Match the antenna’s impedance with the π-type circuit on the RF trace, so that impedance of the antenna as seen from the RF pin matches closely with that of the chip. This reduces reflections to the minimum. Espressif Systems ESP32-H2 Series Hardware Design Guidelines v0.5 Submit Documentation Feedback...

  • Page 27: Q: Tx Performance Is Not Bad, But The Rx Sensitivity Is Low

    Solution: Keep the antenna away from crystals. Do not route high-frequency signal traces close to the RF trace. Please see Section for details. Espressif Systems ESP32-H2 Series Hardware Design Guidelines v0.5 Submit Documentation Feedback...

  • Page 28: Hardware Development

    • The USB auto-download will be disabled if the following conditions occur in the application, where it will be neces- sary to set the chip to Download Boot mode first by configuring the strapping pin. Espressif Systems ESP32-H2 Series Hardware Design Guidelines v0.5 Submit Documentation Feedback...
  • Page 29 – USB GPIOs are configured to other peripherals, such as UART and LEDC. • It is recommended that the user retains control of the strapping pins to avoid the USB download function not being available in case of the above scenario. Espressif Systems ESP32-H2 Series Hardware Design Guidelines v0.5 Submit Documentation Feedback...

  • Page 30: Related Documentation And Resources

    Find an Espressif hardware product suitable for your needs by comparing or applying filters. https://products.espressif.com/#/product-selector?language=en Contact Us • See the tabs Sales Questions, Technical Enquiries, Circuit Schematic & PCB Design Review, Get Samples (Online stores), Become Our Supplier, Comments & Suggestions. https://espressif.com/en/contact-us/sales-questions Espressif Systems ESP32-H2 Series Hardware Design Guidelines v0.5 Submit Documentation Feedback...
  • Page 31 Power Amplifier Resistor-Capacitor Real-Time Clock System-in-Package Zero-ohm resistor A zero-ohm resistor is a placeholder on the circuit so that another higher ohm resistor can replace it, depending on design cases. Espressif Systems ESP32-H2 Series Hardware Design Guidelines v0.5 Submit Documentation Feedback...
  • Page 32 Revision History Revision History Date Version Release Notes 2023-05-24 v0.5 Preliminary release Espressif Systems ESP32-H2 Series Hardware Design Guidelines v0.5 Submit Documentation Feedback...
  • Page 33 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 © 2023 Espressif Systems (Shanghai) Co., Ltd. All rights reserved.

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