ESPRESSIF ESP8684-MINI-1 Smart Wifi and Bluetooth Module User Manual

ESPRESSIF ESP8684-MINI-1 Smart Wifi and Bluetooth Module

Small-sized 2.4 GHz Wi-Fi (802.11 b/g/n) and Bluetooth® 5 module
Built around ESP8684 series of SoCs, RISC-V single-core microprocessor 14 GPIOs
On-board PCB antenna or external antenna connector

Module Overview

Features

CPU and On-Chip Memory

• ESP8684H2 or ESP8684H4 embedded, 32-bit RISC-V single-core processor, up to 120 MHz
• 576 KB ROM
• 272 KB SRAM (16 KB for cache)
• SiP flash (see details in Table 1 Ordering Information)
• Access to flash accelerated by cache
• Supports flash in-Circuit Programming (ICP)

Wi-Fi

• IEEE 802.11 b/g/n-compliant
• Center frequency range of operating channel: 2412 ~ 2462 MHz
• Supports 20 MHz bandwidth in 2.4 GHz band
• 1T1R mode with data rate up to 72.2 Mbps
• Wi-Fi Multimedia (WMM)
• TX/RX A-MPDU, TX/RX A-MSDU
• Immediate Block ACK
• Fragmentation and defragmentation
• Transmit opportunity (TXOP)
• Automatic Beacon monitoring (hardware TSF)
• 3 × virtual Wi-Fi interfaces
• Simultaneous support for Infrastructure BSS in Station mode, SoftAP mode, Station + SoftAP mode, and promiscuous mode
  Note that when ESP8684 series scans in Station mode, the SoftAP channel will change along with the Station channel

Bluetooth®

• Bluetooth LE: Bluetooth 5
• Speed: 125 kbps, 500 kbps, 1 Mbps, 2 Mbps
• Advertising extensions
• Multiple advertisement sets
• Channel selection algorithm #2
• Internal co-existence mechanism between Wi-Fi and Bluetooth to share the same antenna

Peripherals

GPIO, SPI, UART, I2C, LED PWM controller, general DMA controller, temperature sensor, SAR ADC

Integrated Components on Module

• 26 MHz crystal oscillator

Antenna Options

• On-board PCB antenna (ESP8684-MINI-1)

Operating Conditions

• Operating voltage/Power supply: 3.0 ~ 3.6 V
• Operating ambient temperature: –40 ~ 105 °C

Description

ESP8684-MINI-1 is a general-purpose Wi-Fi and Bluetooth LE modules. 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.

The ordering information for the module is as follows

Module

|

Ordering code

| Chip embedded| SiP Flash| Ambient operating temperature (°C)| Module dimensions (mm)
---|---|---|---|---|---
ESP8684-MINI-1 (ANT)| ESP8684-MINI-1-H2| ESP8684H2| 2 MB| –40 ∼ 105|

13.2 × 16.6 × 2.4

ESP8684-MINI-1-H4| ESP8684H4| 4 MB

• ESP8684-MINI-1 comes with a PCB antenna. ESP8684-MINI-1 is available in two variants that integrate the ESP8684H2 and ESP8684H4 chip respectively.
• The ESP8684H2 and the ESP8684H4 chip fall into the same category, namely ESP8684 chip series. ESP8684 series of chips have a 32-bit RISC-V single-core processor. They integrate a rich set of peripherals, ranging from
• UART, I2C, LED PWM controller, general DMA controller, temperature sensor, and SAR ADC. It also includes SPI, Dual SPI and Quad SPI interfaces.
• ESP8684H2 and ESP8684H4 chip vary only in the size of system in package (SiP) flash. For details, please refer to ESP8684 Series Comparison in ESP8684 Series Datasheet.

Pin Definitions

Pin Layout

The pin diagram below shows the approximate location of pins on the module.

Pin Description

The module has 53 pins. See pin definitions in Table 2.
For peripheral pin configurations, please refer to ESP8684 Series Datasheet

36-53

| P| Ground
3V3| 3| P| Power supply
Name| No.| Type1| Function
---|---|---|---

NC

| 4, 7, 9, 10,

15, 17, 24,

25, 27, 28,

29, 32-35

|

—

|

Not connected

IO2| 5| I/O/T| GPIO2, ADC1_CH2, FSPIQ
IO3| 6| I/O/T| GPIO3, ADC1_CH3

EN

|

8

|

I

| High: on, enables the chip. Low: off, the chip powers off.

Note: Do not leave the EN pin floating.

IO0| 12| I/O/T| GPIO0, ADC1_CH0
IO1| 13| I/O/T| GPIO1, ADC1_CH1
IO10| 16| I/O/T| GPIO10, FSPICS0
IO4| 18| I/O/T| GPIO4, ADC1_CH4, FSPIHD, MTMS
IO5| 19| I/O/T| GPIO5, FSPIWP, MTDI
IO6| 20| I/O/T| GPIO6, FSPICLK, MTCK
IO7| 21| I/O/T| GPIO7, FSPID, MTDO
IO8| 22| I/O/T| GPIO8
IO9| 23| I/O/T| GPIO9
IO18| 26| I/O/T| GPIO18
RXD0| 30| I/O/T| GPIO19, U0RXD
TXD0| 31| I/O/T| GPIO20, U0TXD

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

Get Started

What You Need

To develop applications for module you need:

• 1 x ESP8684-MINI-1
• 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.

Hardware Connection

1. Solder the ESP8684-MINI-1 module to the RF testing board as shown in Figure 2.
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.
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 ESP8684-MINI-1, please refer to ESP8684 Series Datasheet.

Set up Development Environment

The Espressif IoT Development Framework (ESP-IDF for short) is a framework for developing applications based on the Espressif ESP32. Users can develop applications with ESP8684 in Windows/Linux/macOS based on ESP-IDF. Here we take Linux operating system as an example

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

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.

Get ESP-IDF

To build applications for ESP8684-MINI-1 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

• mkdir -p ~/esp
• cd ~/esp
• 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.

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

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:

• $HOME/esp/esp-idf/export.sh

Now everything is ready, you can build your first project on ESP8684-MINI-1 module

Create Your First Project

Start a Project

Now you are ready to prepare your application for ESP8684-MINI-1 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.

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

Configure

Navigate to your ‘hello_world’ directory from Step Start a Project, set ESP8684 chip as the target and run the project configuration utility ‘menuconfig’.

1. cd ~/esp/hello_world
2. idf.py set-target esp8684
3. idf.py menuconfig

Setting the target with ‘idf.py set-target esp8684’ 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

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 menu config 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 menu config help’for further information.

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

If there are no errors, the build will finish by generating the firmware binary .bin file.

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 ESP8684 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 :

If there are no issues by the end of the flash process, the board will reboot and start up the “hello_world” application.

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:

After startup and diagnostic logs scroll up, you should see “Hello world!” printed out by the application

To exit IDF monitor use the shortcut Ctrl+].
That’s all what you need to get started with ESP8684-MINI-1 module! Now you are ready to try some other examples in ESP-IDF, or go right to developing your own applications.

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 and BLE functions.

• Operation Frequency:
  • WiFi: 2412 ~ 2462 MHz
  • Bluetooth: 2402 ~ 2480 MHz
• Number of Channel:
  • WiFi: 11
  • Bluetooth: 40
• Modulation:
  • WiFi: DSSS; OFDM
  • Bluetooth: GFSK
• Type: On-board PCB Antenna
• Gain: 3.96 dBi Max

The module can be used for IoT applications with a maximum 3.96 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.

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: 3.96 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-ESP8684M1” with their finished product.

Information on test modes and additional testing requirements

• Operation Frequency:
  • WiFi: 2412 ~ 2462 MHz
  • Bluetooth: 2402 ~ 2480 MHz
• Number of Channel:
  • WiFi: 11
  • Bluetooth: 40
• Modulation:
  • WiFi: DSSS; OFDM
  • Bluetooth: GFSK

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.

FCC Statement

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.

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-ESP8684M1”.

Related Documentation and Resources

Related Documentation

• ESP8684 Series Datasheet – Specifications of the ESP8684 hardware.

• ESP8684 Technical Reference Manual – Detailed information on how to use the ESP8684 memory and peripherals.

• ESP8684 Hardware Design Guidelines – Guidelines on how to integrate the ESP8684 into your hardware product.

• Certificates
  https://espressif.com/en/support/documents/certificates

• Documentation Updates and Update Notification Subscription
  https://espressif.com/en/support/download/documents

Developer Zone

• ESP-IDF Programming Guide for ESP8684 – 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

• ESP8684 Series SoCs – Browse through all ESP8684 SoCs.
  https://espressif.com/en/products/socs?id=ESP8684

• ESP8684 Series Modules – Browse through all ESP8684-based modules.
  https://espressif.com/en/products/modules?id=ESP8684

• ESP8684 Series DevKits – Browse through all ESP8684-based devkits.
  https://espressif.com/en/products/devkits?id=ESP8684

• 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

Revision History

Disclaimer and Copyright Notice

Information in this document, including URL references, is subject to change without notice.
ALL THIRD PARTY’S 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.
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.

References

• Get Started - ESP32-C2 - — ESP-IDF Programming Guide latest documentation
• Wireless SoCs, Software, Cloud and AIoT Solutions | Espressif Systems
• The ESP Journal
• Build System - ESP32 - — ESP-IDF Programming Guide latest documentation
• Build System - ESP32 - — ESP-IDF Programming Guide latest documentation
• ESP-IDF Versions - ESP32 - — ESP-IDF Programming Guide latest documentation
• Get Started - ESP32-C2 - — ESP-IDF Programming Guide latest documentation
• ESP32 Forum - Index page
• Sales Questions | Espressif Systems
• ESP DevKits | Espressif Systems
• ESP Modules | Espressif Systems
• ESP SoCs | Espressif Systems
• Certificates | Espressif Systems
• Technical Documents | Espressif Systems
• SDKs & Demos | Espressif Systems
• Espressif Systems · GitHub
• GitHub - espressif/esp-idf: Espressif IoT Development Framework. Official development framework for Espressif SoCs.
• esp-idf/examples/get-started/hello_world at c77c4ccf6c43ab09fd89e7c907bf5cf2a3499e3b · espressif/esp-idf · GitHub
• esp-idf/examples at master · espressif/esp-idf · GitHub
• ESP Product Selector

Read User Manual Online (PDF format)

Read User Manual Online (PDF format)  >>

Download This Manual (PDF format)

Download this manual  >>