ESPRESSIF ESP32-H2-WROOM-02C Bluetooth Low Energy and IEEE 802.15.4 Module User Manual

A: The VBAT pin is connected to the internal 3V3 power supply by
default or can be connected to an external battery power supply
ranging from 3.0 to 3.6 V.

“`

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ESP32-H2-WROOM-02C
User Manual Version 1.1
Bluetooth® Low Energy and IEEE 802.15.4 module Built around ESP32-H2 series of SoCs, RISC-V single-core 32-bit microprocessor 2 MB or 4 MB flash in chip package 19 GPIOs On-board PCB antenna
ESP32-H2-WROOM-02C
www.espressif.com

1 Module Overview

1.1 Features

CPU and On-Chip Memory · ESP32-H2 embedded, RISC-V single-core 32-bit microprocessor, up to 96 MHz · 128 KB ROM · 320 KB SRAM · 4 KB LP Memory · 2 MB or 4 MB in-package flash
Bluetooth · Bluetooth Low Energy (Bluetooth 5.3 certified) · Bluetooth mesh · Bluetooth Low Energy long range (Coded PHY, 125 Kbps and 500 Kbps) · Bluetooth Low Energy high speed (2 Mbps) · Bluetooth Low Energy advertising extensions and multiple advertising sets · Simultaneous operation of Broadcaster, Observer, Central, and Peripheral devices · Multiple connections · LE power control
IEEE 802.15.4 · IEEE Standard 802.15.4-2015 compliant

· Supports 250 Kbps data rate in 2.4 GHz band and OQPSK PHY
· Supports Thread · Supports Zigbee 3.0 · Supports Matter · Supports other application-layer protocols
(HomeKit, MQTT, etc)
Peripherals
· 19 GPIOs 3 strapping pins
· I2C, I2S, SPI, UART, ADC, LED PWM, ETM, GDMA, PCNT, PARLIO, RMT, TWAI®, MCPWM, USB Serial/JTAG, temperature sensor, general-purpose timers, system timer, watchdog timer
Integrated Components on Module
· 32 MHz crystal oscillator
Antenna Options
· On-board PCB antenna
Operating Conditions
· Operating voltage/Power supply: 3.03.6 V · Operating ambient temperature: 40105 °C

1.2 Description
ESP32-H2-WROOM-02C is a powerful, generic Bluetooth® Low Energy and IEEE 802.15.4 combo module that has a rich set of peripherals. This module is an ideal choice for a wide variety of application scenarios related to Internet of Things (IoT), such as embedded systems, smart home, wearable electronics, etc.
ESP32-H2-WROOM-02C comes with a PCB antenna.
The series comparison for ESP32-H2-WROOM-02C is as follows:

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1 Module Overview

Table 1: ESP32-H2-WROOM-02C Series Comparison

Ordering Code
ESP32-H2-WROOM-02C-H2S ESP32-H2-WROOM-02C-H4S

Flash
2 MB (Quad SPI) 4 MB (Quad SPI)

Ambient Temp. (°C)
40105

Size (mm)
20.0 × 18.0 × 3.2

ESP32-H2-WROOM-02C has integrated the ESP32-H2 chip, which has a 32-bit RISC-V single-core CPU that operates at up to 96 MHz.
Note: For more information on ESP32-H2 chip, please refer to ESP32-H2 Series Datasheet.

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Contents

1 Module Overview

1.1 Features

1.2 Description

2 Pin Definitions

2.1 Pin Layout

2.2 Pin Description

3 Get Started

3.1 What You Need

3.2 Hardware Connection

3.3 Set up Development Environment

3.3.1 Install Prerequisites

3.3.2 Get ESP-IDF

3.3.3 Set up Tools

3.3.4 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

Related Documentation and Resources

Revision History

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2 Pin Definitions
2 Pin Definitions
2.1 Pin Layout
The pin diagram below shows the approximate location of pins on the module.

3V3 1
EN 2
IO4 3
IO5 4
GND
29 IO10 5
GND
IO11 6
IO8 7
IO9 8
GND 9

A
28 IO0 27 IO1 26 IO2 25 IO3 24 IO27 23 IO26 22 TXD0 21 RXD0 20 IO25

IO12 10 IO13 11 IO14 12 GND 13 VBAT 14 IO22 15
NC 16 NC 17 NC 18 NC 19

Figure 1: Pin Layout (Top View)
Note A: The zone marked with dotted lines is the antenna keepout zone. To learn more about the keepout zone for module’s antenna on the base board, please refer to ESP32-H2 Hardware Design Guidelines > Section Positioning a Module on a Base Board.

2.2 Pin Description
The module has 29 pins. See pin definitions in Table 2 Pin Description. For peripheral pin configurations, please refer to ESP32-H2 Series Datasheet.

Name 3V3

Table 2: Pin Definitions

No. Type1 Function

P Power supply

Cont’d on next page

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2 Pin Definitions

Name
EN
IO4 IO5 IO10 IO11 IO8 IO9 GND IO12 IO13 IO14 VBAT
IO22 NC IO25 RXD0 TXD0 IO26 IO27 IO3 IO2 IO1 IO0

No.
2
3 4 5 6 7 8 9, 13, 29 10 11 12 14
15 16 ~19
20 21 22 23 24 25 26 27 28

Type1
I
I/O/T I/O/T I/O/T I/O/T I/O/T I/O/T
P I/O/T I/O/T I/O/T
P
I/O/T —
I/O/T I/O/T I/O/T I/O/T I/O/T I/O/T I/O/T I/O/T I/O/T

Table 2 cont’d from previous page
Function High: on, enables the chip. Low: off, the chip powers off. Note: Do not leave the EN pin floating. GPIO4, FSPICLK, ADC1_CH3, MTCK GPIO5, FSPID, ADC1_CH4, MTDI GPIO10, ZCD0 GPIO11, ZCD1
GPIO8
GPIO9 Ground
GPIO12 GPIO13, XTAL_32K_P GPIO14, XTAL_32K_N Connected to internal 3V3 power supply (Default) or external battery power supply (3.0 ~ 3.6 V).
GPIO22 NC GPIO25, FSPICS3 GPIO23, FSPICS1, U0RXD GPIO24, FSPICS2, U0TXD GPIO26, FSPICS4, USB_DGPIO27, FSPICS5, USB_D+ GPIO3, FSPIHD, ADC1_CH2, MTDO GPIO2, FSPIWP, ADC1_CH1, MTMS GPIO1, FSPICS0, ADC1_CH0 GPIO0, FSPIQ

1 P: power supply; I: input; O: output; T: high impedance.

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3 Get Started
3 Get Started
3.1 What You Need
To develop applications for module you need: · 1 x ESP32-H2-WROOM-02C · 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 for ESP32-H2.
3.2 Hardware Connection
1. Solder the ESP32-H2-WROOM-02C 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 IO9 to GND via a jumper. Then, turn “ON” the testing board. 6. Download firmware into flash. For details, see the sections below. 7. After download, remove the jumper on IO9 and GND.

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3 Get Started
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: IO9 is internally pulled up (logic high). If IO9 is kept high or left floating, the normal Boot mode (SPI Boot) is selected. If this pin is pulled down to GND, the Download mode (Joint Download Boot) is selected. Note that IO8 must be high for proper operation in Download mode. For more information on ESP32-H2-WROOM-02C, please refer to ESP32-H2 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 Espressif chips. Users can develop applications with ESP32-H2 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:

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

cmake ninja-build ccache dfu-util libusbx

· Ubuntu and Debian:

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

venv cmake ninja-build ccache libffi-dev libssl-dev dfu-util libusb-1.0-0

· Arch:
1

sudo pacman -S –needed gcc git make flex bison gperf python cmake ninja ccache dfu-util libusb python-pip

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-H2-WROOM-02C 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’:
1 mkdir -p ~/esp 2 cd ~/esp 3 git clone –recursive https://github.com/espressif/esp-idf.git

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3 Get Started
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 esp32h2
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-H2-WROOM-02C module.
3.4 Create Your First Project
3.4.1 Start a Project
Now you are ready to prepare your application for ESP32-H2-WROOM-02C 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.

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3 Get Started
3.4.3 Configure
Navigate to your `hello_world’ directory from Step 3.4.1. Start a Project, set ESP32-H2 chip as the target and run the project configuration utility `menuconfig’.
1 cd ~/esp/hello_world 2 idf.py set-target esp32h2 3 idf.py menuconfig
Setting the target with `idf.py set-target esp32h2′ 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 –help’ for 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”…

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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 write_flash —
flash_mode dio –flash_size detect –flash_freq 40m 0x10000 build/hello_world.bin build 0x1000 build/bootloader/bootloader.bin 0x8000 build/partition_table/
partition-table.bin 17 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 flash
Replace PORT with your ESP32-H2 board’s 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 esp32h2 -p /dev/ttyUSB0 -b 460800 –before=default_reset –after=hard_reset
write_flash –flash_mode dio –flash_freq 48m –flash_size 2MB 0x0 bootloader/ bootloader.bin 0x10000 hello_world.bin 0x8000 partition_table/partition-table.bin 3 esptool.py v4.6 4 Serial port /dev/ttyUSB0 5 Connecting…. 6 Chip is ESP32-H2 (revision v0.1) 7 Features: BLE 8 Crystal is 32MHz 9 MAC: 60:55:f9:f7:3e:93:ff:fe 10 Uploading stub… 11 Running stub… 12 Stub running…

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3 Get Started

13 Changing baud rate to 460800 14 Changed. 15 Configuring flash size… 16 Flash will be erased from 0x00000000 to 0x00005fff… 17 Flash will be erased from 0x00010000 to 0x00034fff… 18 Flash will be erased from 0x00008000 to 0x00008fff… 19 Compressed 20880 bytes to 12788… 20 Writing at 0x00000000… (100 %) 21 Wrote 20880 bytes (12788 compressed) at 0x00000000 in 0.6 seconds (effective 297.5
kbit/s)… 22 Hash of data verified. 23 Compressed 149424 bytes to 79574… 24 Writing at 0x00010000… (20 %) 25 Writing at 0x00019959… (40 %) 26 Writing at 0x00020bb5… (60 %) 27 Writing at 0x00026d8f… (80 %) 28 Writing at 0x0002e60a… (100 %) 29 Wrote 149424 bytes (79574 compressed) at 0x00010000 in 2.1 seconds (effective 571.7
kbit/s)… 30 Hash of data verified. 31 Compressed 3072 bytes to 103… 32 Writing at 0x00008000… (100 %) 33 Wrote 3072 bytes (103 compressed) at 0x00008000 in 0.0 seconds (effective 539.7 kbit/
s)… 34 Hash of data verified.
35
36 Leaving… 37 Hard resetting via RTS pin…
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 <PORT> monitor 2 Running idf_monitor in directory […]/esp/hello_world/build 3 Executing “python […]/esp-idf/tools/idf_monitor.py -b 115200 […]/esp/hello_world/
build/hello_world.elf”… 4 — idf_monitor on <PORT> 115200 –5 — Quit: Ctrl+] | Menu: Ctrl+T | Help: Ctrl+T followed by Ctrl+H –6 ets Jun 8 2016 00:22:57
7
8 rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT) 9 ets Jun 8 2016 00:22:57 10 …
After startup and diagnostic logs scroll up, you should see “Hello world!” printed out by the application.

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3 Get Started

…

Hello world!

Restarting in 10 seconds…

This is esp32h2 chip with 1 CPU core(s), BLE, 802.15.4 (Zigbee/Thread), silicon

revision v0.1, 2 MB external flash

5 Minimum free heap size: 268256 bytes

Restarting in 9 seconds…

Restarting in 8 seconds…

Restarting in 7 seconds…

To exit IDF monitor use the shortcut Ctrl+].
That’s all what you need to get started with ESP32-H2-WROOM-02C module! Now you are ready to try some other examples in ESP-IDF, or go right to developing your own applications.

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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 BLE, Thread, and Zigbee functions. · Operation Frequency: Bluetooth: 2402 ~ 2480 MHz Zigbee: 2405 ~ 2480 MHz Thread: 2405 ~ 2480 MHz · Number of Channel: Bluetooth: 40 Zigbee/Thread: 16 · Modulation: Bluetooth: GFSK Zigbee: O-QPSK Thread: O-QPSK · Type: PCB Antenna · Gain: 3.26 dBi
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 user’s 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 host’s printed board microstrip trace antenna, etc.

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4 U.S. FCC Statement

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.
Antennas
Antenna specification are as follows: · Type: 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-ESPH2WR02C” with their finished product.
Information on test modes and additional testing requirements
· Operation Frequency: Bluetooth: 2402 ~ 2480 MHz Zigbee: 2405 ~ 2480 MHz Thread: 2405 ~ 2480 MHz
· Number of Channel: Bluetooth: 40 Zigbee/Thread: 16
· Modulation: Bluetooth: GFSK Zigbee: O-QPSK

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4 U.S. FCC Statement
Thread: O-QPSK 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 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 user’s 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.

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4 U.S. FCC Statement
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.
End Product Labeling
The final end product must be labeled in a visible area with the following: “Contains Transmitter Module FCC ID: 2AC7Z-ESPH2WR02C”.

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Documents / Resources

ESPRESSIF ESP32-H2-WROOM-02C Bluetooth Low Energy and IEEE 802.15.4 Module [pdf] User Manual
ESP32-H2-WROOM-02C Bluetooth Low Energy and IEEE 802.15.4 Module, ESP32-H2-WROOM-02C, Bluetooth Low Energy and IEEE 802.15.4 Module, Low Energy and IEEE 802.15.4 Module, Energy and IEEE 802.15.4 Module, IEEE 802.15.4 Module, 802.15.4 Module, Module

References

User Manual

ESPRESSIF ESP32-H2-WROOM-02C Bluetooth Low Energy and IEEE 802.15.4 Module User Manual

ESP32-H2-WROOM-02C Bluetooth Low Energy and IEEE 802.15.4 Module

Specifications

Product Usage Instructions

Pin Definitions

Pin Layout

Pin Description

Get Started

What You Need

Hardware Connection

Set up Development Environment

Create Your First Project

FAQ

Q: What is the default power supply for VBAT pin?

Documents / Resources

References

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