FCC ID: 2AC7Z-ESPS2SOLO2 2.4GHz Wi-Fi IoT Module

WARNING:pdfminer.pdfpage:The PDF <_io.BufferedReader name='/Volumes/Scratch/Incoming/eg-scratch/6111066.pdf'> contains a metadata field indicating that it should not allow text extraction. Ignoring this field and proceeding. Use the check_extractable if you want to raise an error in this case ESP32-S2-SOLO-2 User Manual 2.4GHz Wi-Fi loT Module Built around ESP32-S2 series of SoC, Xtensa single-core 32-bit LX7 microprocessor Flash up to 16 MB, optional 2 MB PSRAM in chip package 36 GPIOs, rich set of peripherals On-board PCB antenna ESP32-S2-SOLO-2 www.espressif.com Version 0.5 Espressif Systems Copyright 2022 1 Module Overview 1 Module Overview ESP32-S2-SOLO-2 is a general-purpose Wi-Fi module. The rich set of peripherals and a small size make this module an ideal choice for smart homes, industrial automation, health care, consumer electronics, etc. Table 1: ESP32-S2-SOLO-2 Specifications Categories Parameters Specifications Wi-Fi Protocols Frequency range Module interfaces Integrated crystal Integrated SPI flash 802.11 b/g/n (up to 150 Mbps) 2412 ~ 2462 MHz GPIO, SPI, I2S, UART, I2C, LED PWM, TWAI, LCD, Camera interface, ADC, DAC, touch sensor, temper-

ature sensor, USB OTG 40 MHz crystal 4 MB Hardware Operating voltage/Power supply 3.0 V ~ 3.6 V Operating current Average: 80 mA Minimum current delivered by power supply 500 mA Ambient temperature 40 C ~ +85 C/105 C Moisture sensitivity level (MSL) Level 3 Espressif Systems 2 ESP32-S2-SOLO-2 User Manual v0.5 Contents Contents 1 Module Overview 2 Pin Definitions 2.1 Pin Layout 2.2 Pin Description 3 Get Started 3.1 What You Need 3.2 3.3 Hardware Connection Set up Development Environment 3.3.1 Install Prerequisites 3.3.2 Get ESP-IDF 3.3.3 3.3.4 Set up Tools Set up Environment Variables 3.4 Create Your First Project 3.4.1 Start a Project 3.4.2 Connect Your Device 3.4.3 Configure 3.4.4 Build the Project 3.4.5 Flash onto the Device 3.4.6 Monitor 4 U.S. FCC Statement 5 Related Documentation and Resources Revision History 2 4 4 4 6 6 6 7 7 7 8 8 8 8 8 9 9 10 11 13 17 18 Espressif Systems 3 ESP32-S2-SOLO-2 User Manual v0.5 2 Pin Definitions 2 Pin Definitions 2.1 Pin Layout The pin diagram below shows the approximate location of pins on the module. Figure 1: Pin Layout (Top View) 2.2 Pin Description The module has 41 pins. See pin definitions in Table 2. For peripheral pin configurations, please refer to ESP32-S2 Series Datasheet. Table 2: Pin Definitions Name No. Type1 Function GND 3V3 1 2 P P Ground Power supply Espressif Systems 4 ESP32-S2-SOLO-2 User Manual v0.5 Contd on next page GND3V3ENIO4IO5IO6IO7IO204039383736353433323130292827GNDIO1IO2TXD0RXD0IO42IO41IO40IO39IO38IO37IO36IO35IO041GNDKeepout ZoneGNDGNDGNDGNDGNDGNDGNDGND181920IO10IO11IO12212223IO13IO14IO21151617IO3IO46IO9242526IO33IO34IO451234567891011121314IO15IO16IO17IO18IO8IO19 2 Pin Definitions Name No. Type1 Function Table 2 contd from previous page EN IO4 IO5 IO6 IO7 IO15 IO16 IO17 IO18 IO8 IO19 IO20 IO3 IO46 IO9 IO10 IO11 IO12 IO13 IO14 IO21 IO33 IO34 IO45 IO0 IO35 IO36 IO37 IO38 IO39 IO40 IO41 IO42 RXD0 TXD0 IO2 IO1 GND EPAD 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 I High: on, enables the chip. Low: off, the chip powers off. Note: Do not leave the EN pin floating. I/O/T RTC_GPIO4, GPIO4, TOUCH4, ADC1_CH3 I/O/T RTC_GPIO5, GPIO5, TOUCH5, ADC1_CH4 I/O/T RTC_GPIO6, GPIO6, TOUCH6, ADC1_CH5 I/O/T RTC_GPIO7, GPIO7, TOUCH7, ADC1_CH6 I/O/T RTC_GPIO15, GPIO15, U0RTS, ADC2_CH4, XTAL_32K_P I/O/T RTC_GPIO16, GPIO16, U0CTS, ADC2_CH5, XTAL_32K_N I/O/T RTC_GPIO17, GPIO17, U1TXD, ADC2_CH6, DAC_1 I/O/T RTC_GPIO18, GPIO18, U1RXD, ADC2_CH7, DAC_2, CLK_OUT3 I/O/T RTC_GPIO8, GPIO8, TOUCH8, ADC1_CH7 I/O/T RTC_GPIO19, GPIO19, U1RTS, ADC2_CH8, CLK_OUT2, USB_D-

I/O/T RTC_GPIO20, GPIO20, U1CTS, ADC2_CH9, CLK_OUT1, USB_D+

I/O/T RTC_GPIO3, GPIO3, TOUCH3, ADC1_CH2 I GPIO46 I/O/T RTC_GPIO9, GPIO9, TOUCH9, ADC1_CH8, FSPIHD I/O/T RTC_GPIO10, GPIO10, TOUCH10, ADC1_CH9, FSPICS0, FSPIIO4 I/O/T RTC_GPIO11, GPIO11, TOUCH11, ADC2_CH0, FSPID, FSPIIO5 I/O/T RTC_GPIO12, GPIO12, TOUCH12, ADC2_CH1, FSPICLK, FSPIIO6 I/O/T RTC_GPIO13, GPIO13, TOUCH13, ADC2_CH2, FSPIQ, FSPIIO7 I/O/T RTC_GPIO14, GPIO14, TOUCH14, ADC2_CH3, FSPIWP, FSPIDQS I/O/T RTC_GPIO21, GPIO21 I/O/T SPIIO4, GPIO33, FSPIHD I/O/T SPIIO5, GPIO34, FSPICS0 I/O/T GPIO45 I/O/T RTC_GPIO0, GPIO0 I/O/T SPIIO6, GPIO35, FSPID I/O/T SPIIO7, GPIO36, FSPICLK I/O/T SPIDQS, GPIO37, FSPIQ I/O/T GPIO38, FSPIWP I/O/T MTCK, GPIO39, CLK_OUT3 I/O/T MTDO, GPIO40, CLK_OUT2 I/O/T MTDI, GPIO41, CLK_OUT1 I/O/T MTMS, GPIO42 I/O/T U0RXD, GPIO44, CLK_OUT2 I/O/T U0TXD, GPIO43, CLK_OUT1 I/O/T RTC_GPIO2, GPIO2, TOUCH2, ADC1_CH1 I/O/T RTC_GPIO1, GPIO1, TOUCH1, ADC1_CH0 P P Ground Ground 1 P: power supply; I: input; O: output; T: high impedance. Espressif Systems 5 ESP32-S2-SOLO-2 User Manual v0.5 3 Get Started 3 Get Started 3.1 What You Need To develop applications for module you need:

1 x ESP32-S2-SOLO-2 1 x Espressif RF testing board 1 x USB-to-Serial board 1 x Micro-USB cable 1 x PC running Linux In this user guide, we take Linux operating system as an example. For more information about the configuration on Windows and macOS, please refer to ESP-IDF Programming Guide. 3.2 Hardware Connection 1. Solder the ESP32-S2-SOLO-2 module to the RF testing board as shown in Figure 2. Figure 2: Hardware Connection 2. Connect the RF testing board to the USB-to-Serial board via TXD, RXD, and GND. 3. Connect the USB-to-Serial board to the PC. 4. Connect the RF testing board to the PC or a power adapter to enable 5 V power supply, via the Micro-USB cable. 5. During download, connect IO0 to GND via a jumper. Then, turn ON the testing board. 6. Download firmware into flash. For details, see the sections below. Espressif Systems 6 ESP32-S2-SOLO-2 User Manual v0.5 3 Get Started 7. After download, remove the jumper on IO0 and GND. 8. Power up the RF testing board again. The module will switch to working mode. The chip will read programs from flash upon initialization. Note:

IO0 is internally logic high. If IO0 is set to pull-up, the Boot mode is selected. If this pin is pull-down or left floating, the Download mode is selected. For more information on ESP32-S2-SOLO-2, please refer to ESP32-S2 Series Datasheet. 3.3 Set up Development Environment The Espressif IoT Development Framework (ESP-IDF for short) is a framework for developing applications based on the Espressif SoCs. Users can develop applications with ESP32-S2 in Windows/Linux/macOS based on ESP-IDF. Here we take Linux operating system as an example. 3.3.1 Install Prerequisites To compile with ESP-IDF you need to get the following packages:

CentOS 7 & 8:

1 2 sudo yum -y update && sudo yum install git wget flex bison gperf python3 python3-

pip python3-setuptools cmake ninja-build ccache dfu-util libusbx Ubuntu and Debian:

sudo apt-get install git wget flex bison gperf python3 python3-pip python3-

setuptools cmake ninja-build ccache libffi-dev libssl-dev dfu-util libusb-1.0-0 sudo pacman -S --needed gcc git make flex bison gperf python-pip cmake ninja ccache dfu-util libusb 1 2 Arch:

1 2 Note:

This guide uses the directory ~/esp on Linux as an installation folder for ESP-IDF. Keep in mind that ESP-IDF does not support spaces in paths. 3.3.2 Get ESP-IDF To build applications for ESP32-S2-SOLO-2 module, you need the software libraries provided by Espressif in ESP-IDF repository. To get ESP-IDF, create an installation directory (~/esp) to download ESP-IDF to and clone the repository with git clone:

Espressif Systems 7 ESP32-S2-SOLO-2 User Manual v0.5 3 Get Started 1 mkdir -p ~/esp 2 cd ~/esp 3 git clone --recursive https://github.com/espressif/esp-idf.git ESP-IDF will be downloaded into ~/esp/esp-idf. Consult ESP-IDF Versions for information about which ESP-IDF version to use in a given situation. 3.3.3 Set up Tools Aside from the ESP-IDF, you also need to install the tools used by ESP-IDF, such as the compiler, debugger, Python packages, etc. ESP-IDF provides a script named install.sh to help set up the tools in one go. 1 cd ~/esp/esp-idf 2 ./install.sh 3.3.4 Set up Environment Variables The installed tools are not yet added to the PATH environment variable. To make the tools usable from the command line, some environment variables must be set. ESP-IDF provides another script export.sh which does that. In the terminal where you are going to use ESP-IDF, run:

1 . $HOME/esp/esp-idf/export.sh Now everything is ready, you can build your first project on ESP32-S2-SOLO-2 module. 3.4 Create Your First Project 3.4.1 Start a Project Now you are ready to prepare your application for ESP32-S2-SOLO-2 module. You can start with get-started/hello_world project from examples directory in ESP-IDF. Copy get-started/hello_world to ~/esp directory:

1 cd ~/esp 2 cp -r $IDF_PATH/examples/get-started/hello_world . There is a range of example projects in the examples directory in ESP-IDF. You can copy any project in the same way as presented above and run it. It is also possible to build examples in-place, without copying them first. 3.4.2 Connect Your Device Now connect your module to the computer and check under what serial port the module is visible. Serial ports in Linux start with /dev/tty in their names. Run the command below two times, first with the board unplugged, then with plugged in. The port which appears the second time is the one you need:

1 ls /dev/tty*

Note:

Keep the port name handy as you will need it in the next steps. Espressif Systems 8 ESP32-S2-SOLO-2 User Manual v0.5 3 Get Started 3.4.3 Configure Navigate to your hello_world directory from Step 3.4.1. Start a Project, set ESP32-S2 chip as the target and run the project configuration utility menuconfig. 1 cd ~/esp/hello_world 2 idf.py set-target esp32s2 3 idf.py menuconfig Setting the target with idf.py set-target ESP32-S2 should be done once, after opening a new project. If the project contains some existing builds and configuration, they will be cleared and initialized. The target may be saved in environment variable to skip this step at all. See Selecting the Target for additional information. If the previous steps have been done correctly, the following menu appears:

Figure 3: Project Configuration - Home Window You are using this menu to set up project specific variables, e.g. Wi-Fi network name and password, the processor speed, etc. Setting up the project with menuconfig may be skipped for hello_word. This example will run with default configuration The colors of the menu could be different in your terminal. You can change the appearance with the option

--style. Please run idf.py menuconfig --helpfor further information. 3.4.4 Build the Project Build the project by running:

1 idf.py build This command will compile the application and all ESP-IDF components, then it will generate the bootloader, partition table, and application binaries. 1 $ idf.py build 2 Running cmake in directory /path/to/hello_world/build 3 Executing cmake -G Ninja --warn-uninitialized /path/to/hello_world... Espressif Systems 9 ESP32-S2-SOLO-2 User Manual v0.5 3 Get Started 4 Warn about uninitialized values. 5 -- Found Git: /usr/bin/git (found version 2.17.0) 6 -- Building empty aws_iot component due to configuration 7 -- Component names: ... 8 -- Component paths: ... 9 10 ... (more lines of build system output) 11 12 [527/527] Generating hello_world.bin 13 esptool.py v2.3.1 14 15 Project build complete. To flash, run this command:

16 ../../../components/esptool_py/esptool/esptool.py -p (PORT) -b 921600 17 write_flash --flash_mode dio --flash_size detect --flash_freq 40m 18 0x10000 build/hello_world.bin build 0x1000 build/bootloader/bootloader.bin 0x8000 19 build/partition_table/partition-table.bin 20 or run idf.py -p PORT flash If there are no errors, the build will finish by generating the firmware binary .bin file. 3.4.5 Flash onto the Device Flash the binaries that you just built onto your module by running:

1 idf.py -p PORT [-b BAUD] flash Replace PORT with your ESP32-S2 boards serial port name from Step: Connect Your Device. You can also change the flasher baud rate by replacing BAUD with the baud rate you need. The default baud rate is 460800. For more information on idf.py arguments, see idf.py. Note:

The option flash automatically builds and flashes the project, so running idf.py build is not necessary. When flashing, you will see the output log similar to the following:

1 ... 2 esptool.py esp32s2 -p /dev/ttyUSB0 -b 460800 --before=default_reset --after=hard_reset 3 write_flash --flash_mode dio --flash_freq 80m --flash_size 4 MB 0x0 bootloader/bootloader. bin 4 0x10000 hello_world.bin 0x8000 partition_table/partition-table.bin 5 esptool.py v3.2-dev 6 Serial port /dev/ttyUSB0 7 Connecting.... 8 Chip is ESP32-S2 9 Features: WiFi 10 Crystal is 40MHz 11 MAC: 7c:df:a1:e0:00:64 12 Uploading stub... 13 Running stub... Espressif Systems 10 ESP32-S2-SOLO-2 User Manual v0.5 3 Get Started 14 Stub running... 15 Changing baud rate to 460800 16 Changed. 17 Configuring flash size... 18 Flash will be erased from 0x00000000 to 0x00004fff... 19 Flash will be erased from 0x00010000 to 0x00039fff... 20 Flash will be erased from 0x00008000 to 0x00008fff... 21 Compressed 18896 bytes to 11758... 22 Writing at 0x00000000... (100 %) 23 Wrote 18896 bytes (11758 compressed) at 0x00000000 in 0.5 seconds (effective 279.9 kbit/s)

... 24 Hash of data verified. 25 Compressed 168208 bytes to 88178... 26 Writing at 0x00010000... (16 %) 27 Writing at 0x0001a80f... (33 %) 28 Writing at 0x000201f1... (50 %) 29 Writing at 0x00025dcf... (66 %) 30 Writing at 0x0002d0be... (83 %) 31 Writing at 0x00036c07... (100 %) 32 Wrote 168208 bytes (88178 compressed) at 0x00010000 in 2.4 seconds (effective 569.2 kbit/s

)... 33 Hash of data verified. 34 Compressed 3072 bytes to 103... 35 Writing at 0x00008000... (100 %) 36 Wrote 3072 bytes (103 compressed) at 0x00008000 in 0.1 seconds (effective 478.9 kbit/s)... 37 Hash of data verified. 38 39 Leaving... 40 Hard resetting via RTS pin... 41 Done If there are no issues by the end of the flash process, the board will reboot and start up the hello_world application. 3.4.6 Monitor To check if hello_world is indeed running, type idf.py -p PORT monitor (Do not forget to replace PORT with your serial port name). This command launches the IDF Monitor application:

1 $ idf.py -p /dev/ttyUSB0 monitor 2 Running idf_monitor in directory [...]/esp/hello_world/build 3 Executing python [...]/esp-idf/tools/idf_monitor.py -b 115200 4 [...]/esp/hello_world/build/hello-world.elf... 5 --- idf_monitor on /dev/ttyUSB0 115200 ---

6 --- Quit: Ctrl+] | Menu: Ctrl+T | Help: Ctrl+T followed by Ctrl+H ---

7 ets Jun 8 2016 00:22:57 8 9 rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT) 10 ets Jun 8 2016 00:22:57 Espressif Systems 11 ESP32-S2-SOLO-2 User Manual v0.5 3 Get Started 11 ... After startup and diagnostic logs scroll up, you should see Hello world! printed out by the application. 1 ... 2 Hello world!

3 Restarting in 10 seconds... 4 This is esp32s2 chip with 1 CPU core, WiFi, 5 silicon revision 1 6 Minimum free heap size: 390684 bytes 7 Restarting in 9 seconds... 8 Restarting in 8 seconds... 9 Restarting in 7 seconds... To exit IDF monitor use the shortcut Ctrl+]. Thats all what you need to get started with ESP32-S2-SOLO-2 module! Now you are ready to try some other examples in ESP-IDF, or go right to developing your own applications. Espressif Systems 12 ESP32-S2-SOLO-2 User Manual v0.5 4 U.S. FCC Statement 4 U.S. FCC Statement The device complies with KDB 996369 D03 OEM Manual v01. Below are integration instructions for host product manufacturers according to the KDB 996369 D03 OEM Manual v01. List of Applicable FCC Rules FCC Part 15 Subpart C 15.247 Specific Operational Use Conditions The module has WiFi functions. Operation Frequency:

WiFi: 2412 ~ 2462 MHz Number of Channel:

WiFi: 11 Modulation:

WiFi: DSSS; OFDM Type: On-board PCB antenna Gain: 3.26 dBi Max The module can be used for IoT applications with a maximum 3.26 dBi antenna. The host manufacturer installing this module into their product must ensure that the final composit product complies with the FCC requirements by a technical assessment or evaluation to the FCC rules, including the transmitter operation. The host manufacturer has to be aware not to provide information to the end user regarding how to install or remove this RF module in the users manual of the end product which integrates this module. The end user manual shall include all required regulatory information/warning as show in this manual. Limited Module Procedures Not applicable. The module is a single module and complies with the requirement of FCC Part 15.212. Trace Antenna Designs Not applicable. The module has its own antenna, and does not need a hosts printed board microstrip trace antenna, etc. RF Exposure Considerations The module must be installed in the host equipment such that at least 20cm is maintained between the antenna and users body; and if RF exposure statement or module layout is changed, then the host product manufacturer required to take responsibility of the module through a change in FCC ID or new application. The FCC ID of the module cannot be used on the final product. In these circumstances, the host manufacturer will be responsible for re-evaluating the end product (including the transmitter) and obtaining a separate FCC authorization. Espressif Systems 13 ESP32-S2-SOLO-2 User Manual v0.5 4 U.S. FCC Statement Antennas Antenna specification are as follows:

Type: On-board PCB antenna Gain: 3.26 dBi This device is intended only for host manufacturers under the following conditions:

The transmitter module may not be co-located with any other transmitter or antenna. The module shall be only used with the external antenna(s) that has been originally tested and certified with this module. The antenna must be either permanently attached or employ a unique antenna coupler. As long as the conditions above are met, further transmitter test will not be required. However, the host manufacturer is still responsible for testing their end-product for any additional compliance requirements required with this module installed (for example, digital device emissions, PC peripheral requirements, etc.). Label and Compliance Information Host product manufacturers need to provide a physical or e-label stating Contains FCC ID:

2AC7Z-ESPS2SOLO2 with their finished product. Information on test modes and additional testing requirements Operation Frequency:

WiFi: 2412 ~ 2462 MHz Number of Channel:

WiFi: 11 Modulation:

WiFi: DSSS; OFDM Host manufacturer must perform test of radiated and conducted emission and spurious emission, etc., according to the actual test modes for a stand-alone modular transmitter in a host, as well as for multiple simultaneously transmitting modules or other transmitters in a host product. Only when all the test results of test modes comply with FCC requirements, then the end product can be sold legally. Additional testing, Part 15 Subpart B compliant The modular transmitter is only FCC authorized for FCC Part 15 Subpart C 15.247 and that the host product manufacturer is responsible for compliance to any other FCC rules that apply to the host not covered by the modular transmitter grant of certification. If the grantee markets their product as being Part 15 Subpart B compliant (when it also contains unintentional-radiator digital circuity), then the grantee shall provide a notice stating that the final host product still requires Part 15 Subpart B compliance testing with the modular transmitter installed. This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference Espressif Systems 14 ESP32-S2-SOLO-2 User Manual v0.5 4 U.S. FCC Statement in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one of the following measures:

Reorient or relocate the receiving antenna. Increase the separation between the equipment and receiver. Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. Consult the dealer or an experienced radio/TV technician for help. This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:

This device may not cause harmful interference. This device must accept any interference received, including interference that may cause undesired operation. Caution:

Any changes or modifications not expressly approved by the party responsible for compliance could void the users authority to operate the equipment. This equipment complies with FCC RF radiation exposure limits set forth for an uncontrolled environment. This device and its antenna must not be co-located or operating in conjunction with any other antenna or transmitter. The antennas used for this transmitter must be installed to provide a separation distance of at least 20 cm from all persons and must not be co-located or operating in conjunction with any other antenna or transmitter. OEM Integration Instructions This device is intended only for OEM integrators under the following conditions:

The transmitter module may not be co-located with any other transmitter or antenna. The module shall be only used with the external antenna(s) that has been originally tested and certified with this module. As long as the conditions above are met, further transmitter test will not be required. However, the OEM integrator is still responsible for testing their end-product for any additional compliance requirements required with this module installed (for example, digital device emissions, PC peripheral requirements, etc.). Validity of Using the Module Certification In the event that these conditions cannot be met (for example certain laptop configurations or co-location with another transmitter), then the FCC authorization for this module in combination with the host equipment is no longer considered valid and the FCC ID of the module cannot be used on the final product. In these circumstances, the OEM integrator will be responsible for re-evaluating the end product (including the transmitter) and obtaining a separate FCC authorization. Espressif Systems 15 ESP32-S2-SOLO-2 User Manual v0.5 4 U.S. FCC Statement End Product Labeling The final end product must be labeled in a visible area with the following: Contains Transmitter Module FCC ID:

2AC7Z-ESPS2SOLO2. Espressif Systems 16 ESP32-S2-SOLO-2 User Manual v0.5 5 Related Documentation and Resources 5 Related Documentation and Resources Related Documentation ESP32-S2 Series Datasheet Specifications of the ESP32-S2 hardware. ESP32-S2 Technical Reference Manual Detailed information on how to use the ESP32-S2 memory and peripherals. ESP32-S2 Hardware Design Guidelines Guidelines on how to integrate the ESP32-S2 into your hardware product. ESP32-S2 Series SoC Errata Descriptions of errors in ESP32-S2 series of SoCs from chip revision 0 forward. Certificates https://espressif.com/en/support/documents/certificates ESP32-S2 Product/Process Change Notifications (PCN) https://espressif.com/en/support/documents/pcns ESP32-S2 Advisories Information on security, bugs, compatibility, component reliability. https://espressif.com/en/support/documents/advisories Documentation Updates and Update Notification Subscription https://espressif.com/en/support/download/documents Developer Zone ESP-IDF Programming Guide for ESP32-S2 Extensive documentation for the ESP-IDF development framework. ESP-IDF and other development frameworks on GitHub. https://github.com/espressif ESP32 BBS Forum Engineer-to-Engineer (E2E) Community for Espressif products where you can post questions, share knowledge, explore ideas, and help solve problems with fellow engineers. https://esp32.com/

The ESP Journal Best Practices, Articles, and Notes from Espressif folks. https://blog.espressif.com/

See the tabs SDKs and Demos, Apps, Tools, AT Firmware. https://espressif.com/en/support/download/sdks-demos Products ESP32-S2 Series SoCs Browse through all ESP32-S2 SoCs. https://espressif.com/en/products/socs?id=ESP32-S2 ESP32-S2 Series Modules Browse through all ESP32-S2-based modules. https://espressif.com/en/products/modules?id=ESP32-S2 ESP32-S2 Series DevKits Browse through all ESP32-S2-based devkits. https://espressif.com/en/products/devkits?id=ESP32-S2 ESP Product Selector 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 17 ESP32-S2-SOLO-2 User Manual v0.5 Revision History Revision History Date Version Release notes 2022-09-01 v0.5 Preliminary release Espressif Systems 18 ESP32-S2-SOLO-2 User Manual v0.5 Disclaimer and Copyright Notice Information in this document, including URL references, is subject to change without notice. ALL THIRD PARTYS INFORMATION IN THIS DOCUMENT IS PROVIDED AS IS WITH NO WARRANTIES TO ITS AUTHENTICITY AND ACCURACY. NO WARRANTY IS PROVIDED TO THIS DOCUMENT FOR ITS MERCHANTABILITY, NON-

INFRINGEMENT, FITNESS FOR ANY PARTICULAR PURPOSE, NOR DOES ANY WARRANTY OTHERWISE ARISING OUT OF ANY PROPOSAL, SPECIFICATION OR SAMPLE. All liability, including liability for infringement of any proprietary rights, relating to use of information in this document is disclaimed. No licenses express or implied, by estoppel or otherwise, to any intellectual property rights are granted herein. The Wi-Fi Alliance Member logo is a trademark of the Wi-Fi Alliance. The Bluetooth logo is a registered trademark of Bluetooth SIG. www.espressif.com All trade names, trademarks and registered trademarks mentioned in this document are property of their respective owners, and are hereby acknowledged. Copyright 2022 Espressif Systems (Shanghai) Co., Ltd. All rights reserved.

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ESPRESSIF SYSTEMS (SHANGHAI) CO., LTD /2AC7Z 2AC7Z-ESPS2SOLO2 Section 15.212 Modular Transmitters Request for Modular Approval Request for Limited Modular Approval Requirements EUT Conditions Comply (Y/N) Single Modular Approval Requirements The radio portion of this module is shielded, please see exhibition external photos. The module has buffer modulation/data inputs. The module has its own power supply regulation. Please see the schem.pdf The requirements of antenna connector and spurious emission have been fulfilled. Please refer to the Test Report exhibition. Please refer to the Setup Photo exhibition for the stand-alone test configuration. Y Y Y Y Y 1 2 3 4 5 The radio elements of the modular transmitter must have their own shielding. The physical crystal and tuning capacitors may be located external to the shielded radio elements. The modular transmitter must have buffered modulation/data inputs (if such inputs are provided) to ensure that the module will comply with Part 15 requirements under conditions of excessive data rates or over-modulation. The modular transmitter must have its own power supply regulation. The modular transmitter must comply with the antenna and transmission system requirements of Sections 15.203, 15.204(b) and 15.204(c). The antenna must either be permanently attached or employ a unique antenna coupler (at all connections between the module and the antenna, including the cable). The professional installation provision of Section 15.203 is not applicable to modules but can apply to limited modular approvals under paragraph (b) of this section. The modular transmitter must be tested in a stand-alone configuration, i.e., the module must not be inside another device during testing for compliance with Part 15 requirements. Unless the transmitter module will be battery powered, it must comply with the AC line conducted requirements found in Section 15.207. AC or DC power lines and data input/output lines connected to the module must not contain ferrites, unless they will be marketed with the module (see Section 15.27(a)). The length of these lines shall be the length typical of actual use or, if that length is unknown, at least 10 centimeters to insure that there is no coupling between the case of the module and supporting 6 7 equipment. Any accessories, peripherals, or support equipment connected to the module during testing shall be unmodified and commercially available

(see Section 15.31(i)). The modular transmitter must be equipped with either a permanently affixed label or must be capable of electronically displaying its FCC identification number.

(A) If using a permanently affixed label, the modular transmitter must be labeled with its own FCC identification number, and, if the FCC identification number is not visible when the module is installed inside another device, then the outside of the device into which the module is installed must also display a label referring to the enclosed module. This exterior label can use wording such as the following: Contains Transmitter Module FCC ID: XYZMODEL1 or Contains FCC ID:

XYZMODEL1. Any similar wording that expresses the same meaning may be used. The Grantee may either provide such a label, an example of which must be included in the application for equipment authorization, or, must provide adequate instructions along with the module which explain this requirement. In the latter case, a copy of these instructions must be included in the application for equipment authorization.

(B) If the modular transmitter uses an electronic display of the FCC identification number, the information must be readily accessible and visible on the modular transmitter or on the device in which it is installed. If the module is installed inside another device, then the outside of the device into which the module is installed must display a label referring to the enclosed module. This exterior label can use wording such as the following:

Contains FCC certified transmitter module(s). Any similar wording that expresses the same meaning may be used. The user manual must include instructions on how to access the electronic display. A copy of these instructions must be included in the application for equipment authorization. The modular transmitter must comply with any specific rules or operating requirements that ordinarily apply to a complete transmitter and the manufacturer must provide adequate instructions along with the module to explain any such requirements. A copy of these instructions must be included in the application for equipment authorization. The Module will be labeled with its own FCC ID, and the instruction on the labeling rule of the end product has been stated in the User Manual of this module. Please refer to the Label and User Manual exhibition. Y The required FCC rule has been fulfilled and all the instructions for maintaining compliance have been clearly stated in the User Manual. Y 8 The modular transmitter must comply with any applicable RF exposure requirements in its final configuration. Please refer exhibition RF Exposure for the compliance of MPE RF exposure rule. Y _________________________________ Contact Person: Mia Zhou E-mail: zhoumiaomiao@espressif.com