Wireless-Tag Technology Co., Ltd WT018684-S2 Datasheet V1.0.0 WT018684-S2 Datasheet Version 1.0.0 April 27, 2022 Wireless-Tag Copyright 2022, Wireless-Tag Technology Co., Ltd http://www.wireless-tag.com 1 Wireless-Tag Technology Co., Ltd WT018684-S2 Datasheet V1.0.0 2.4GHz Wi-Fi(802.11b/g/n) + Bluetooth 5(LE) module Built around ESP8684 series of SoCs, 32-bit RISC-V single-core processor Flash up to 4 MB, rich set of peripherals On-board PCB antenna and external antenna connector Ordering Code WT018684-S2-N1 WT018684-S2-N2 WT018684-S2-N4 Chip Embedded ESP8684 ESP8684 ESP8684 Flash(MB) 1 2 4 PSRAM(MB) 0 0 0 Antenna PCB PCB PCB Copyright 2022, Wireless-Tag Technology Co., Ltd http://www.wireless-tag.com 2 Wireless-Tag Technology Co., Ltd WT018684-S2 Datasheet V1.0.0 About the Document This document provides users with WT018684-S2 series specification. Document Version Please go to the official website of wireless-tag to download the latest version of the document. Revision History Please go to the Revision History page to view the revisions. Disclaimer of Warranties and Copyright Notice The information in this article, including the URL address for reference, is subject to change without notice. The Documentation is provided "as is" without warranty, including any warranty of merchantability, fitness for a particular purpose, or non-infringement, and any warranties of any proposal, specification, or sample referred elsewhere. This document is not responsible for any infringement of any patent rights arising from the use of the information in this document. Nothing in this document grants, by estoppel or otherwise, any license to use the Intellectual Property Rights, whether express or implied. All trade names, trademarks and registered trademarks mentioned herein are the property of their respective owners and are hereby declared. Copyright 2022 wireless-tag. All rights reserved. Note The contents of this manual are subject to change due to product version upgrades or other reasons. Shenzhen Wireless-Tag Technology Co., Ltd. reserves the right to modify the contents of this manual without any notice or prompt. This manual is only used as a guide. Shenzhen Wireless-Tag Technology Co., Ltd. does its best to provide accurate information in this manual. However, Shenzhen Wireless-Tag Technology Co., is completely correct. All Ltd. does not ensure that the content of the manual statements in this manual , information and advice do not constitute any express or implied warranties. Copyright 2022, Wireless-Tag Technology Co., Ltd http://www.wireless-tag.com 3 Wireless-Tag Technology Co., Ltd WT018684-S2 Datasheet V1.0.0 Revision History No. Version Changes Notes Editor Date 1 V1.0.0 C First release GUO April 27, 2022
*ChangesCcreateAaddMmodifyDdelete Copyright 2022, Wireless-Tag Technology Co., Ltd http://www.wireless-tag.com 4 Wireless-Tag Technology Co., Ltd WT018684-S2 Datasheet V1.0.0 Table of Contents 1 Module Overview .............................................................................................................................6 1.1 Features ................................................................................................................................ 6 1.2 Description ............................................................................................................................7 1.3 Applications .......................................................................................................................... 8 2 Block Diagram ................................................................................................................................ 10 3 Pin Definitions ................................................................................................................................11 3.1 Pin Layout ........................................................................................................................... 11 3.2 Pin Description ....................................................................................................................11 3.3 Strapping Pins ..................................................................................................................... 12 4 Electrical Characteristics ................................................................................................................ 14 4.1 Absolute Maximum Ratings ................................................................................................14 4.2 Recommended Operating Conditions ................................................................................14 5 Application Notes ...........................................................................................................................14 5.1 Module Dimensions ............................................................................................................14 5.2 Reflow Profile ......................................................................................................................16 5.3 Module Schematics ............................................................................................................ 16 5.4 Peripheral Schematics ........................................................................................................ 17 6 Product Trial ................................................................................................................................... 18 Copyright 2022, Wireless-Tag Technology Co., Ltd http://www.wireless-tag.com 5 Wireless-Tag Technology Co., Ltd WT018684-S2 Datasheet V1.0.0 1 Module Overview 1.1 Features MCU ESP8684 SoC embedded, 32-bit RISC-V single-core processor, up to 120 MHz 576 KB ROM 272 KB SRAM 16KB for cache SIP flash Flash controller with cache Supports flash in Circuit Programming (ICP) Wi-Fi IEEE 802.11 b/g/n compliant Supports 20MHz bandwidth in 2.4GHz band 1T1R mode with data rates up to 72.2Mbps Data rates up to 72.2 Mbps in 802.11n mode Frame aggregation (TX/RX A-MPDU, TX/RX A-MSDU) Immediate Block ACK Fragmentation and defragmentaion Transmit opportunity(TXOP) Automatic Beacon monitoringhardware TSF) Wireless multimediaWMM 3 virtual Wi-Fi interfaces Antenna diversity Supports external power amplifier Simultaneous support for Infrastructure BSS in Station mode, SoftAP mode, Station + SoftAP mode, and promiscuous mode NBCE power:14.82dbm Copyright 2022, Wireless-Tag Technology Co., Ltd http://www.wireless-tag.com 6 Wireless-Tag Technology Co., Ltd WT018684-S2 Datasheet V1.0.0 Note that when ESP8684 scans in Station mode, the SoftAP channel will change along with the Station channel. Bluetooth Bluetooth low energyBluetooth LE:Bluetooth 5 High power mode Speed: 125kbps, 500kbps, 1Mbps, 2Mbps Advertising Extensions Multiple Advertisement Sets Channel Selection Algorithm #2 Internal co-existence mechanism between Wi-Fi and Bluetooth to share the same antenna NBCE power:5.11dbm Hardware Peripheral interfaces: 14xGPIO, 3xSPI, 2xUART, I2C master, LED PWM controller with up to 6 channels, General DMA controller (GDMA) with 1 receive channel and 1 transmit channel Analog interfaces: 112-bit SAR ADCs with up to 5 channels, 1x temperature sensor Timers: 1x54-bit general-purpose timer, 2x watchdog timers, 1x52-bit system timer 1.2 Description The WT018684-S2 module is based on ESP8684, which is a highly integrated and low-power system-on-chip (SoC) supporting Wi-Fi and Bluetooth, designed for Internet of Things (IoT), mobile devices, wearable electronics, smart homes, such as wake word detection, speech recognition, face recognition, smart control panels, smart speakers, etc. The ESP8684 chip features state- of -the -art power and RF Copyright 2022, Wireless-Tag Technology Co., Ltd http://www.wireless-tag.com 7 Wireless-Tag Technology Co., Ltd WT018684-S2 Datasheet V1.0.0 performance, complying with the Wi-Fi IEEE802.11b/g/n protocol and BLE 5.0. The chip integrates a 32-bit RISC-V single-core processor, up to 120 MHz. You can power off the CPU and make use of the low-power co-processor to constantly monitor the peripherals for changes or crossing of thresholds. It supports a secondary development without the need for additional microcontrollers or processors. The chip supports a variety of low-power working states, which can meet the power consumption requirements of various application scenarios. The unique features of the chip, such as fine-grained clock gating, dynamic voltage and frequency scaling, and RF output power adjustment, can achieve the best balance between communication distance, communication rate and power consumption. The WT018684-S2 module integrate a rich set of peripherals, ranging from UARTSPII2S I2CADCtemperature sensor, GPIO, LED PWM controller, GDMA, general-purpose timer, watchdog timer. The WT018684-S2 module have a variety of unique hardware security features ensured by the cryptographic hardware accelerators that support AES, SHA and RSA algorithms. RNG, HMAC and digital signature modules provide more security performance. Other security features include flash encryption, secure boot, signature verification. Reliable security features make the SoC perfect for a variety of encryption products. The WT8684-S2 module supports Bluetooth Low Energy:
Bluetooth5, Bluetooth mesh. Bluetooth speed supports: 125kbps, 500kbps, 1Mbps, 2Mbps. It aslo supports advertising extensions, multiple advertisement, channel selection. WT018684-S2 is generic Wi-Fi+Bluetooth LE MCU-based module, integrated with ESP8684 series of SoCs. 1.3 Applications Generic Low-power IoT Sensor Cameras for Video Streaming Hubs Over-the-top (OTT) devices Generic Low-power IoT Data Speech recognition Loggers Image recognition Copyright 2022, Wireless-Tag Technology Co., Ltd http://www.wireless-tag.com 8 Wireless-Tag Technology Co., Ltd WT018684-S2 Datasheet V1.0.0 Mesh network Home automation Health/Medical/Nursing Wi-Fi enabled toys Smart home control panel Wearable electronics Smart building Retail & Catering Applications Industrial automation Smart POS machines Smart agriculture Audio device Smart door lock Copyright 2022, Wireless-Tag Technology Co., Ltd http://www.wireless-tag.com 9 Wireless-Tag Technology Co., Ltd WT018684-S2 Datasheet V1.0.0 2 Block Diagram Figure 1 Block Diagram Copyright 2022, Wireless-Tag Technology Co., Ltd http://www.wireless-tag.com 10 Wireless-Tag Technology Co., Ltd WT018684-S2 Datasheet V1.0.0 3 Pin Definitions 3.1 Pin Layout Figure 2 Pin Layout 3.2 Pin Description Table 1 Pin Definition and Description Type Index Name 1 2 3 4 5 6 7 8 9 10 11 EN I IO1 IO6 IO10 IO3 3V3 GND RXDO TXDO IO5 IO4 I/O/T I/O/T I/O/T I/O/T PA G I/O/T I/O/T I/O/T I/O/T Power Domain VDD3P3_RTC VDD3P3_RTC VDDP3_CPU VDDP3_CPU VDDP3_CPU
VDDP3_CPU VDDP3_CPU VDDP3_CPU VDDP3_CPU Function the High: on, enables chip. Low: off, the chip powers off. Note: Do not leave the CHIP_EN pin floating. GPIO0,ADC1_CH1 GPIO6,FSPICLK,MTCK GPIO10,FSPICSO GPIO3,ADC1_CH3 Analog power supply GroundFSPID,MTDP GPIO19,U0RXD GPIO20,U0TXD GPIO5,FSPIWP,MTDI GPIO4 ADC1_CH4,FSPIHD,MTMS Copyright 2022, Wireless-Tag Technology Co., Ltd http://www.wireless-tag.com 11 Wireless-Tag Technology Co., Ltd WT018684-S2 Datasheet V1.0.0 12 Test IO9 points I/O/T VDDP3_CPU The BOOT pin of the module, when power-on: pull down to download and enter PA: Analog power supply PD: Digital IO power supply I: Input O: Output T: High impedance The pin function in this table refers only to some fixed settings and do not cover all cases for signals that can be input and output through the GPIO matrix. 3.3 Strapping Pins ESP8684 series has two strapping pins:
GPIO8 GPIO9 Software can read the values of GPIO8 and GPIO9 from GPIO_STRAPPING field in GPIO_STRAP_REG register. During the chips system reset, the latches of the strapping pins sample the voltage level as strapping bits of 0 or 1, and hold these bits until the chip is powered down or shut down. There are several types of system resets:
Power-on reset RTC watchdog reset Brownout reset analog super watchdog reset By default, GPIO9 is connected to the internal weak pull-up resistor. If GPIO9 is not connected or connected to an external high-impedance circuit, the latched bit value will be 1. To change the strapping bit values, you can apply the external pull-down/pull-up resistances, or use the host MCUs GPIOs to control the voltage level of these pins when powering on ESP8684 series. After reset, the strapping pins work as normal-function pins. See Table 2 for detailed booting configurations of the strapping pins Table 2 Strapping Pins Booting Mode Pin GPIO8 Default N/A SPI Boot Download Boot Dont care 1 Copyright 2022, Wireless-Tag Technology Co., Ltd http://www.wireless-tag.com 12 Wireless-Tag Technology Co., Ltd WT018684-S2 Datasheet V1.0.0 GPIO9 Internal weak pull-up 1 0 Enabling/Disabling ROM Messages Print During Booting Pin Default Function GPIO8 N/A When the value of eFuse field EFUSE_UART_PRINT_CONTROL is 0 (default), print is enabled and not controlled by GPIO8. 1, if GPIO8 is 0, print is enabled; if GPIO8 is 1, it is disabled. 2, if GPIO8 is 0, print is disabled; if GPIO8 is 1, it is enabled. 3, print is disabled and not controlled by GPIO8. The strapping combination of GPIO8=0 and GPIO9=0 is invalid. Figure 3 shows the setup and holding times of the strapping pins before and after the CHIP_EN signal goes high. Details about the parameters are listed in Table 3. t0 t1 VIL_nRST CHIP_EN VIH Strapping pin Table 3 Parameter Descriptions of Setup and Hold Times for the Strapping Pins Parameter Description Minms t0 t1 Setup time befor CHIP_EN goes from low to high Hold time after CHIP_EN goes high 0 3 Copyright 2022, Wireless-Tag Technology Co., Ltd http://www.wireless-tag.com 13 Wireless-Tag Technology Co., Ltd WT018684-S2 Datasheet V1.0.0 4 Electrical Characteristics 4.1 Absolute Maximum Ratings Stresses above those listed in Absolute Maximum Ratings may result in permanent damage to the device. These are stress ratings only and functional operation of the device is not implied. Table 4 Absolute Maximum Ratings Symbol VDDA3P3, VDDA, VDD3P3_RTC, VDD3P3_CPU TSTORE Parameter Power pin voltage Storage temperature Min
-0.3
-40 Max 3.6 150 Unit V 4.2 Recommended Operating Conditions Table 5 Recommended Operating Conditions Symbol VDDA3P3,VDDA,VDD3P 3_RTC,VDD3P3_CPU IVDD 2 TA Parameter Min Typ Max Unit Power pin voltage Current delivered by external power supply Operating ambient temperature 3.0 0.5
-40 3.3 3.6 V A
105 When writing eFuse, VDD3P3_CPU should not exceed 3.3v. When powered by a single power supply, the output current should reach 500mA and above. 5 Application Notes 5.1 Module Dimensions Figure 4 Module Dimensions Copyright 2022, Wireless-Tag Technology Co., Ltd http://www.wireless-tag.com 14 Wireless-Tag Technology Co., Ltd WT018684-S2 Datasheet V1.0.0 Copyright 2022, Wireless-Tag Technology Co., Ltd http://www.wireless-tag.com 15 Wireless-Tag Technology Co., Ltd WT018684-S2 Datasheet V1.0.0 5.2 Reflow Profile Figure 5 Reflow Profile 5.3 Module Schematics Figure 6 Module Schematics Copyright 2022, Wireless-Tag Technology Co., Ltd http://www.wireless-tag.com 16 Wireless-Tag Technology Co., Ltd WT018684-S2 Datasheet V1.0.0 5.4 Peripheral Schematics This is the typical application circuit of the module connected with peripheral components (for example, reset button, JTAG interface, UART interface, etc). Figure 7 Peripheral Schematics Copyright 2022, Wireless-Tag Technology Co., Ltd http://www.wireless-tag.com 17 Wireless-Tag Technology Co., Ltd WT018684-S2 Datasheet V1.0.0 6 Product Trial Sales Mailboxsales@wireless-tag.com Technical Support Mailboxtechnical@wireless-tag.com Federal Communication Commission Statement (FCC, U.S.) This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 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:
(1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. FCC Caution:
Any changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate this equipment. FCC Radiation Exposure Statement:
This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with minimum distance 20cm between the radiator & your body. IMPORTANT NOTES Copyright 2022, Wireless-Tag Technology Co., Ltd http://www.wireless-tag.com 18 Wireless-Tag Technology Co., Ltd WT018684-S2 Datasheet V1.0.0 Co-location :warning This transmitter 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:
2AFOS-WT018684-S2. Information that must be placed in the end user manual
The OEM integrator 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. Integration instructions for host product manufactures according to KDB 996369 D03 OEM Manual v01 2.2 List of applicable FCC rules Copyright 2022, Wireless-Tag Technology Co., Ltd http://www.wireless-tag.com 19 Wireless-Tag Technology Co., Ltd FCC Part 15 Subpart C 15.247 WT018684-S2 Datasheet V1.0.0 2.3 Specific operational use conditions The module is a Bluetooth module with WiFi & BLE 2.4G function. WiFi Specification Frequency:
Operation Number of Channel: 11 Modulation: DSSS Type: PCB Antenna Gain: 3 . 1 2 dBi BLE Specification Frequency:
Operation Number of Channel: 40 2412~2462MHz 2402~2480MHz Modulation: GFSK Type: PCB Antenna Gain: 3 . 1 2 dBi The module can be used for mobile or applications with a maximum 3.12dBi 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 operaition. Th e 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. 2.4 Not applicable. Limited module procedures 2.5 Trace antenna designs Not applicable. The module has its own antenna, and doesnt need a hosts printed board microstrip trace antenna etc. 2.6 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 2.7 Antennas Antenna Specification are as follows:
Copyright 2022, Wireless-Tag Technology Co., Ltd http://www.wireless-tag.com 20 Wireless-Tag Technology Co., Ltd WT018684-S2 Datasheet V1.0.0 Type: PCB Antenna Gain: 3 . 1 2 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 internal 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.
) 2.8 Label and compliance information Host product manufacturers need to provide a physical or e-label stating Contains Transmitter Module FCC ID: 2AFOS-WT018684-S2 with their finished product. 2.9 Information on test modes and additional testing requirements BLE Operation Frequency:
2402~2480MHz Number of Channel: 40 Modulation: GFSK WIFI Operation Frequency:
2412~2462MHz Number of Channel: 11 Modulation: DSSS Host manufacturer must perfom test of radiated & 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. 2.10 Additional testing, Part 15 Subpart B disclaimer 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. Manufacturer's Name: WIRELESS-TAG TECHNOLOGY CO., LIMITED Sample Description: WIFI BLE Module Copyright 2022, Wireless-Tag Technology Co., Ltd http://www.wireless-tag.com 21 Wireless-Tag Technology Co., Ltd WT018684-S2 Datasheet V1.0.0 Trade Mark: Wireless-tag Model number: WT018684-S2 This device was tested for operations. To comply with RF exposure requirements, a minimum separation distance of 20cm must be maintained between the users body and the charger, including the antenna. Accessories that do not meet these requirements may not comply with RF exposure requirements and should be avoided. Use only the supplied or an approved antenna. This device in compliance with the essential requirements and other relevant provisions of Directive 2014/53/EU. All essential radio test suites have been carried out. This restriction will be applied to all Member States of European Union. 1. Declaration of Conformity Hereby, WIRELESS-TAG TECHNOLOGY CO., LIMITED declares that the product type WT018684-S2 is in compliance with Directives 2014/53/EU. The device complies with RF specifications when the device used at 20cm form your body Copyright 2022, Wireless-Tag Technology Co., Ltd http://www.wireless-tag.com 22