FCC ID: 2AFOS-WT055120-S1 BLE Module

WIRELESS-TAG TECHNOLOGY CO.,LIMITED V1.0.0 WT055120-S1 Datasheet V1.0.0 May 25, 2021 Wireless-Tag Technology Co., Ltd. 2020 WIRELESS-TAG TECHNOLOGY CO.,LIMITED All rights reserved. http://www.wireless-tag.com 1 WIRELESS-TAG TECHNOLOGY CO.,LIMITED V1.0.0 About this document This document provides users with WT055120-S1 specifications. Document version Please visit Wireless-Tags official website to download the latest version of the document. Revision history Please go to the document revision history page to view the revisions of the document. Disclaimer and copyright notice Information in this paper, including URL references, is subject to change without prior notice. This document is provided as is with no warranties whatsoever, including any warranty of merchantability, non-infringement, fitness for any particular purpose, or any warranty otherwise arising out of any proposal, specification or sample. All liability, including liability for infringement of any patent rights, relating to use of information in this document is disclaimed. No licenses, either express or implied, by estoppel or otherwise, to any intellectual property rights are granted herein. All trade names, trademarks and registered trademarks mentioned in this document are property of their respective owners, and are hereby acknowledged. Copyright 2020 Wireless-Tag Technology Co., Ltd. All rights reserved. Statement Due to product version upgrade or other reasons, the contents of this datasheet may be changed. 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. Wireless-Tag Technology Co., Ltd makes every effort to provide accurate information in this manual, but it does not guarantee that the contents of the manual are completely free of errors. All statements, information and suggestions in this manual do not constitute any express or implied guarantee. 2020 WIRELESS-TAG TECHNOLOGY CO.,LIMITED All rights reserved. http://www.wireless-tag.com 2 WIRELESS-TAG TECHNOLOGY CO.,LIMITED V1.0.0 Revision History No. Version Changes Change (+ / -) description Author Date 1 V1.0.0 C First release Wang Nov 17, 2020

*Changes: CCreate, AAdd, MModify, DDelete 2020 WIRELESS-TAG TECHNOLOGY CO.,LIMITED All rights reserved. http://www.wireless-tag.com 3 WIRELESS-TAG TECHNOLOGY CO.,LIMITED V1.0.0 Table of Contents 1 Overview ....................................................................................................................................................... 5 2 Module Dimensions ...................................................................................................................................... 8 3 Pin Definition ................................................................................................................................................ 9 3.1 Pin Layout .......................................................................................................................................... 9 3.2 Pin Description ................................................................................................................................... 9 4 Functional Description ................................................................................................................................ 11 4.1 Direct Memory Access Controller (DMA) ...................................................................................... 11 4.2 Independent Watchdog(IWDG) ....................................................................................................... 11 4.3 Window Watchdog(WWDG) ...........................................................................................................12 4.4 General Purpose and Alternate Function(GPIO and AFIO) ............................................................12 4.5 Peripheral Interconnection ............................................................................................................... 13 4.6 Elliptic Curve Cryptography(ECC) ................................................................................................. 13 4.7 Encryption(AES/DES) ..................................................................................................................... 13 4.8 True Random Number Generator(TRNG) .......................................................................................14 4.9 Calculating Accelerator(CALC) ...................................................................................................... 14 4.10 Advanced Timer(ADTIM) ............................................................................................................. 14 4.11 General-Purpose Timer(GPTIMC) ................................................................................................ 15 4.12 Basic Timer(BSTIM) ..................................................................................................................... 16 4.13 Low-Power Timer(LPTIM) ........................................................................................................... 17 4.14 Analog-to-Digital Converter(ADC) ...............................................................................................17 4.15 Real Time Clock(RTC) .................................................................................................................. 18 4.16 Inter-Integrated Circuit Interface(I2C) ...........................................................................................19 4.17 Serial Peripheral Interface 1(LSSPI) ..............................................................................................19 4.18 Serial Peripheral Interface 2(SPI2) ................................................................................................ 20 4.19 Universal Asynchronous Receiver Transmitter(UART) ............................................................... 21 4.20 Audio Interface (PDM) .................................................................................................................. 23 4.21 BLE .................................................................................................................................................23 5 Electrical Characteristics .............................................................................................................................24 2020 WIRELESS-TAG TECHNOLOGY CO.,LIMITED All rights reserved. http://www.wireless-tag.com 4 WIRELESS-TAG TECHNOLOGY CO.,LIMITED V1.0.0 1 Overview BLE5.0 / BLE5.1 Supports 125Kbps/500Kbps/1Mbps/2Mbps Receiving sensitivity-99.7dBm@1Mbps

-97dBm@2Mbps

-105dBm@125Kbps Transmit power+3 dBm Link gain117dBm@125KbpsMax. Supports Single-Ended Antenna Output Frequency Range: 2.400~2.4835 GHz BLE MESH Supports BLE SIG Mesh Supports private MESH MCU core 32-bit CPU core Frequency up to 64MHZ Max. 64KB Data SRAM memory Max. 512KB Data Flash memory Supports two-wire debug protocol System power consumption RX mode: 4.5mA @3.3V TX mode: 4.3 mA @3.3V 0dBm Deep sleep mode: 1.1ARTC wake-up+GPIO wake-up ShutDown mode: 700nAGPIO wake-up Power, reset Main power domainVDD33 Supply voltage range: 1.8VVDD333.6 V POR, PDR, PVD Clock External high-speed crystal oscillator: 16MHz Internal high-speed RC oscillator: 24 MHz External low-speed crystal oscillator: 32.768KHz Internal low-speed RC oscillator: 32.768KHz System peripherals 2020 WIRELESS-TAG TECHNOLOGY CO.,LIMITED All rights reserved. http://www.wireless-tag.com 5 WIRELESS-TAG TECHNOLOGY CO.,LIMITED V1.0.0 DMAsupports 8 multiplexed channels Watchdog timer: IWDG and WWDG Peripheral interconnection PIS System tick timer Security and computing acceleration unit ECC elliptic curve cryptography (256) AES advanced encryption (256/192/128) T/DES advanced encryption (192/128/64) True random number generator (TRNG) Calculating accelerator (CALC) Timer One advanced 16-bit timer (ADTIM), supports 4-channel PWM, 3 of which support dead-zone complementary One general-purpose 32-bit timer A (GPTIMA), supports 4-channel PWM One general-purpose 16-bit timer B (GPTIMB), supports 4-channel PWM One general-purpose 16-bit timer C (GPTIMC), supports 2-channel PWM, one of which supports dead zone complementary One basic timer (BSTIM) One low power timer (LPTIM) RTC ( Real time clock ) Supports high precision hardware temperature compensation ADC ( Analog to digital conversion ) 12-bit high precision SAR ADC Supports up to 9 external channels Supports 3 internal channels Built-in temperature sensor 1/8, 1/4, 1/2, 3/8VDD Internal reference voltage of 1.4V Communication interface 2 x I2C (supports bus arbitration) 2 x SPI 3 x UART (supports ISO7816, LIN, IrDA, etc.) Audio interface 2 x PDM, supports digital MIC 1 x I2S 2020 WIRELESS-TAG TECHNOLOGY CO.,LIMITED All rights reserved. http://www.wireless-tag.com 6 WIRELESS-TAG TECHNOLOGY CO.,LIMITED V1.0.0 General-purpose IO Working temperature: -40105 2020 WIRELESS-TAG TECHNOLOGY CO.,LIMITED All rights reserved. http://www.wireless-tag.com 7 WIRELESS-TAG TECHNOLOGY CO.,LIMITED V1.0.0 2 Module Dimensions Figure 1 Module Dimensions 2020 WIRELESS-TAG TECHNOLOGY CO.,LIMITED All rights reserved. http://www.wireless-tag.com 8 WIRELESS-TAG TECHNOLOGY CO.,LIMITED V1.0.0 3 Pin Definition 3.1 Pin Layout Figure 2 Top View of Pin Layout 3.2 Pin Description The module has a total of 24 pins. See Table 1 for specific descriptions. Table 1 Pin Definition Pin No. Pin Name 1 2 3 4 5 6 7 B12 B13 B14 B15 A00 A01 GND Description GPIO/ADC Channel 0 GPIO/ADC Channel 1 GPIO (BOOT pin, high level is required when programming) GPIO/Wake-up GPIO/ADC Channel 4/Wake-up GPIO/ADC Channel 5 Module power negative 2020 WIRELESS-TAG TECHNOLOGY CO.,LIMITED All rights reserved. http://www.wireless-tag.com 9 WIRELESS-TAG TECHNOLOGY CO.,LIMITED V1.0.0 Pin No. 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Pin Name GND A02 A07 A08 A09 A13 A14 A15 B00 VCC B01 B05 B06 B08 B09 B10 RST Description Module power negative GPIO/ADC Channel 6 GPIO/Wake-up GPIO GPIO GPIO GPIO GPIO GPIO Module power positive 3.3V GPIO GPIO(debug interface data by default) GPIO(debug interface clock by default) GPIO GPIO GPIO Reset input pin, active low 2020 WIRELESS-TAG TECHNOLOGY CO.,LIMITED All rights reserved. http://www.wireless-tag.com 10 WIRELESS-TAG TECHNOLOGY CO.,LIMITED V1.0.0 4 Functional Description 4.1 Direct Memory Access Controller (DMA) The Direct memory access (DMA) is used to provide high-speed data transfer between peripheral and memory or between memory and memory, without intervention from CPU, data can be transferred quickly by DMA, which frees up CPU resources for other operations. The features are described as follows:

Supports 8 independent DMA channels Each DMA channel has an independent handshake signal The priority of each DMA channel is programmable Each priority arbitration uses a fixed priority determined by the DMA channel number Supports various transfer modes Memory to memory Memory to peripheral Peripheral to memory Supports various DMA cycle modes Supports various DMA transfer data bit width Each DMA channel can access the primary and alternate channel controlled data structure All channel controlled data is stored in system memory in little endian format The number of data transferred in a single DMA cycle can be programmed (from 1 to 1024) The transfer address increment can be greater than the data width It can indicate errors on the bus 4.2 Independent Watchdog(IWDG) The independent watchdog IWDG can be used to detect software and hardware abnormalities, such as the main clock stops oscillating, the program becomes out of control and no longer refreshes the watchdog. The features are described as follows:

Free running down counter Writing to the IWDG_RLR register will reload the watchdog After the watchdog is activated, a reset occurs when the counter reaches 0 IWDG interrupt can wake up from sleep mode 0 and sleep mode 2 2020 WIRELESS-TAG TECHNOLOGY CO.,LIMITED All rights reserved. http://www.wireless-tag.com 11 WIRELESS-TAG TECHNOLOGY CO.,LIMITED V1.0.0 4.3 Window Watchdog(WWDG) Window Watchdog(WWDG)will generate a WWDG reset if it is refreshed too early or too late. It can be used to detect whether the software fails to refresh the watchdog or it refreshes the watchdog in the refresh prohibited area to prevent the program from running into an uncontrollable state. The features are described as follows:

Supports setting a watchdog refresh prohibited area Set a watchdog refresh prohibited period through WIN When WIN register is set to 11, refreshing the watchdog in any area will not generate a reset. Refreshing the watchdog in the refresh prohibited area will generate a WWDG reset. WWDG interrupt occurs after the watchdog refresh prohibited area WWDG interrupt can be used as a watchdog refresh request WWDG overflow length can be set It can be set by WWDG_RLR register WWDG reset generated on overflow WWDG interrupt can be used as a watchdog refresh request 4.4 General Purpose and Alternate Function(GPIO and AFIO) Each GPIO port contains 16 independent pins, which can be individually configured as input or output. Each pin can be additionally configured as an open-drain output mode or a filtered input mode, and the drive strength of each pin can be selected when configured as an output pin. GPIO pins can be multiplexed as peripheral function ports, such as PWM output port or UART communication port, and each peripheral can be multiplexed onto multiple pins. The GPIO port supports up to 13 asynchronous external interrupts, which can be configured to any IO pin. And the GPIO port supports triggering other peripherals through PIS. The features are described as follows:

It can be configured as input or output Output mode Push-pull/open drain Pull-up/pull-down Input mode Floating Pull-up/pull-down 2020 WIRELESS-TAG TECHNOLOGY CO.,LIMITED All rights reserved. http://www.wireless-tag.com 12 WIRELESS-TAG TECHNOLOGY CO.,LIMITED V1.0.0 Analog port Supports reset/set of port output data, bitwise operation Supports multiplexing as peripheral functions port Configurable output drive capacity: four drive capacity options Supports 16 external input interrupts Supports write protection of port configuration 4.5 Peripheral Interconnection PIS is used as a bridge interface for the interconnection of peripherals in the microcontroller. The use of PIS can achieve the mutual triggering, control and automation of the peripherals, improve the real-time performance and rapid response ability of the system, avoid occupying excessive CPU resources and simplify software work to provide convenience for various applications. The features are described as follows:

Supports up to 8 PIS channel selection Supports synchronous and asynchronous channel selection Supports signal effective edge selection Supports channel output to pin 4.6 Elliptic Curve Cryptography(ECC) is an asymmetric encryption algorithm based on the Elliptic Curve Cryptography, ECC for short, mathematical theory of elliptic curve. Compared with RSA, ECC has the advantage of using shorter keys to achieve security equivalent to or higher than RSA. 4.7 Encryption(AES/DES) The hardware encryption module is mainly used to encrypt or decrypt data by hardware, and supports AES and DES standards. AES (Advanced Encryption Standard) is the latest block symmetric cipher algorithm, compatible with the Advanced Encryption Standard (AES) specified by the Federal Information Processing Standards Publication (FIPS PUB 197, November 26, 2001). DES (Data Encryption Standard) is a widely used symmetric encryption algorithm, compatible with the Data Encryption Standard (DES) and Triple DES (TDES) specified in the Federal Information Processing Standards Publication (FIPS PUB 46-3, October 25, 1999) , and complies with the American National Standards Institute (ANSI) 9.52 standard. The features are described as follows:

2020 WIRELESS-TAG TECHNOLOGY CO.,LIMITED All rights reserved. http://www.wireless-tag.com 13 WIRELESS-TAG TECHNOLOGY CO.,LIMITED V1.0.0 Suitable for AES, DES and TEDS encryption and decryption operations AES Supports 128/192/256-bit keys Supports ECB/CBC modes Supports 1/8/16/32-bit data exchange DES(TDES) Supports ECB/CBC modes Supports 64/128/192-bit keys Supports 4x32-bit initialization vector (IV) used in CBC mode Supports 1/8/16/32-bit data exchange Supports Direct Memory Access (DMA) (used to transfer data and read processed data) Supports to generate CPU interrupt requests 4.8 True Random Number Generator(TRNG) True random number generator (TRNG) can produce 1-bit serial true random numbers or 8/16/32-bit parallel true random numbers. The features are described as follows:

Supports programmable random bit width Supports programmable seed value Supports random correction mode Supports random sequence error detection 4.9 Calculating Accelerator(CALC) The calculating accelerator (CALC) can perform calculation acceleration of square root and division. The features are described as follows:

Supports up to 32-bit unsigned square root operation Supports division of up to 32-bit signed and unsigned numbers Supports the use of DMA write data to perform calculating operations 4.10 Advanced Timer(ADTIM) The advanced-control timer (ADTIM) consists of a 16-bit auto-load counter driven by a programmable Prescaler. It may be used for a variety of purposes, including measuring the pulse widths of input signals

(input capture), or generating output waveforms (output compare, PWM, complementary PWM with 2020 WIRELESS-TAG TECHNOLOGY CO.,LIMITED All rights reserved. http://www.wireless-tag.com 14 WIRELESS-TAG TECHNOLOGY CO.,LIMITED V1.0.0 dead-time insertion). Pulse widths and waveform periods can be modulated from a few microseconds to several milliseconds using the timer Prescaler and the RCC clock controller Prescaler. The advanced-control timers (ADTIM), general-purpose timers (GPTIMA, GPTIMB, GPTIMC) and basic timers (BSTIM) are completely independent and do not share any clock sources. They can be synchronized together as well. The features are described as follows:

16-bit up, down, up/down auto-reload counter. 16-bit programmable Prescaler allowing dividing (on the fly) the counter clock frequency by any factor between 1 and 65536. Up to 4 independent channels for:

Input Capture Output Compare PWM generation (Edge and Center-aligned Mode) One-pulse mode output Synchronization circuit can control the timer with external signals and interconnect several timers. Interrupt/DMA request is generated when the following events occur:

Update:

counter overflow/underflow, counter initialization

(by software or internal/external trigger) Trigger events (counter start, stop, initialization or count by internal trigger) Input capture (capture register) Output compare (count register paired with compare register) Supports incremental(quadrature) encoder and Hall sensor circuits for positioning purposes. Trigger input for an external clock or cycle-by-cycle current management 4.11 General-Purpose Timer(GPTIMC) The general-purpose timer (GPTIMC) consists of a 16-bit auto-reload counter driven by a programmable Prescaler. It may also be used for multiple purposes, including measuring the pulse lengths of input signals (input capture), or generating output waveforms (output compare, PWM, complementary PWM with dead-time insertion). Pulse lengths and waveform periods can be modulated from a few microseconds to several milliseconds by using the timer Prescaler and the APB clock controller Prescaler. The advanced-control timers (ADTIM1), general-purpose timers (GPTIMA1, GPTIMB1, GPTIMC1) and 2020 WIRELESS-TAG TECHNOLOGY CO.,LIMITED All rights reserved. http://www.wireless-tag.com 15 WIRELESS-TAG TECHNOLOGY CO.,LIMITED V1.0.0 basic timers (BSTIM1) are completely independent and do not share any clock sources. The features are described as follows:

16-bit auto-reload up-counter 16-bit programmable Prescaler allows the counter clock frequency to be divided by any factor between 1 and 65536 (on the fly) Up to 2 independent channels Input capture Output compare PWM generation (Edge-aligned and Center-aligned modes) One-pulse mode output Complementary output programmable dead-time register Synchronization circuit can control the timer with external signal and interconnect several timers The repeat counter is used to update the timing register and only works after the definition number of the counter period Pause input to put timer output signal in reset state or known state Interrupt/DMA generation on the following events:

Update: Counter overflow/underflow, counter initialization (through software or internal/external trigger) Trigger event (counter start, stop, initialization or count by internal/external trigger) Input capture (capture register) Output compare (count register paired with compare register) Brake signal input Trigger input for an external clock or cycle-by-cycle current management 4.12 Basic Timer(BSTIM) The basic timer consists of a 16-bit auto-reload counter driven by a programmable Prescaler. It may be used for a variety of purposes, including measuring the pulse lengths of input signals (input capture) or generating output waveforms (output compare, PWM). Pulse lengths and waveform periods can be modulated from a few microseconds to several milliseconds by using the timer Prescaler and the APB clock controller Prescaler. The advanced-control timers (ADTIM), general-purpose timers (GPTIMA, GPTIMB, GPTIMC) and basic timers (BSTIM) are completely independent and do not share any clock source. The features are described as follows:

16-bit auto-reload up-counter 2020 WIRELESS-TAG TECHNOLOGY CO.,LIMITED All rights reserved. http://www.wireless-tag.com 16 WIRELESS-TAG TECHNOLOGY CO.,LIMITED V1.0.0 16-bit programmable Prescaler used to divide (on the fly) the counter clock frequency by any factor between 1 and 65536 Synchronization circuit can control the timer with external signal and interconnect several timers Interrupt/DMA request is generated when the following event occurs:

Update: Counter overflow/underflow, counter initialization (by software or internal/external trigger) Trigger input for an external clock or cycle-by-cycle current management 4.13 Low-Power Timer(LPTIM) The LPTIM is a 16-bit timer that is designed for low-power applications. Thanks to its multiple clock sources, the LPTIM supports the use of external input as a clock source, and can also count when the internal clock source is stopped. The features are described as follows:

16-bit up-counter 3-bit Prescaler with 8 possible dividing factors (1,2,4,8,16,32,64,128) Clock sources Internal clock sources: HSE, HIS, LSI, LSE, HSE, PLL External clock source: external port input 16-bit ARR auto-reload register 16-bit compare register Continuous or one-shot mode optional Selectable software or hardware trigger Programmable filter Configurable output: Pulse, PWM, Flip Configurable I/O polarity 4.14 Analog-to-Digital Converter(ADC) The ADC module is a 12-bit precision successive approximation analog-to-digital converter. It has up to 8 multiplexed channels allowing it to measure 8 external signals, two internal signals and BVAT voltage signals. The A/D conversion of the various channels can be performed in a single, continuous, scan, or discontinuous mode. The result of the ADC is stored in a left-aligned or right-aligned 16-bit data register. The analog watchdog feature allows the application to detect if the input voltage goes outside the user-defined high or low thresholds.The analog watchdog feature allows the application to detect if the 2020 WIRELESS-TAG TECHNOLOGY CO.,LIMITED All rights reserved. http://www.wireless-tag.com 17 WIRELESS-TAG TECHNOLOGY CO.,LIMITED V1.0.0 input voltage goes outside the user-defined high or low thresholds. The features are described as follows:

Configurable conversion accuracy (6/8/10/12) Interrupt generation at the end of conversion, the end of injected conversion, analog watchdog or overrun events. Supports single and continuous conversion modes Scan mode for automatic conversion of channel 0 to channel n Configurable data alignment Programmable sampling time of each channel External trigger option to configure polarity for both regular and injected conversion Supports discontinuous sampling mode Configurable conversion clock divider DMA request generation during regular channel conversion 4.15 Real Time Clock(RTC) Real Time Clock (RTC) can provide users with accurate time and date information. These keywords are stored in the RTC control register in BCD format to provide users with the alarm function. There are two RTC CLK sources for users to choose from, which are an external 32.768K Hz crystal oscillator and an internal 32.768K Hz RC oscillator. When the MCU is in low power consumption mode, the RTC can still continue to provide accurate time information. The features are described as follows:

Supports calendar display: year, month, day Supports time display: week, hour, minute, second The calendar and time are stored in BCD format Supports leap year detection capability Supports users to set the RTC counter correction function Supports users to set the alarm interrupt function Supports rollover interrupt of year, month, day, week, hour, minute, and second Supports MCU to keep counting in sleep mode Supports users to configure the sleep counter Supports a sleep counting up to 16777216 seconds (194 days). Supports a sleep counting as short as 1/16 second. Supports to detect whether the calendar and time have been cleared. 2020 WIRELESS-TAG TECHNOLOGY CO.,LIMITED All rights reserved. http://www.wireless-tag.com 18 WIRELESS-TAG TECHNOLOGY CO.,LIMITED V1.0.0 4.16 Inter-Integrated Circuit Interface(I2C) The I2C (Inter-chip) bus interface connects the microcontroller and the serial I2C bus. It provides the multi-master capability and controls all I2C bus-specified sequencing, protocol, arbitration and timing. It supports standard mode, fast mode and super ultra-fast mode. At the same time, it is compatible with SMBus (System Management Bus) and PMBus (Power Management Bus). DMA can be used to reduce the burden on the CPU. The features are described as follows:

Slave mode and master mode Multi-master mode Standard mode (up to 100KHz) Fast mode (up to 400KHz) Ultra-fast mode (up to 1MHz) 7-bit and 10-bit addressing modes Multiple 7-bit slave addressing (2 addresses, one of which can be masked) All 7-bit addressing response mode Broadcast call Programmable setup and hold time Optional clock stretching Programmable digital noise filter Transmit/receive FIFOs of depth 8 DMA function SMBus specification Generation and verification hardware PEC (Packet Error Checking) , with ACK control Command and data response control Support address resolution protocol (ARP) Master and device supporting SMBus alert Timeout and idle state detection Compatible with PMBus version 1.1 specification 4.17 Serial Peripheral Interface 1(LSSPI) SPI1 is a full-duplex master/slave synchronous serial interface. The master processor accesses data, control and status information on LSSPI through a bus interface. LSSPI is connected to a DMA controller through a set of DMA signals. LSSPI can be set to one of the two operating modes: serial master mode or serial 2020 WIRELESS-TAG TECHNOLOGY CO.,LIMITED All rights reserved. http://www.wireless-tag.com 19 WIRELESS-TAG TECHNOLOGY CO.,LIMITED V1.0.0 slave mode. LSSPI can be connected to any serial master or serial slave peripheral device using one of the following interfaces. The features are described as follows:

Supports SPI serial peripheral interface Supports SSP protocol Supports national semiconductor ray 4.18 Serial Peripheral Interface 2(SPI2) The SPI/I2S interface can be used to communicate with external devices based on the SPI protocol and the I2S audio protocol. SPI or I2S mode is selected by software. SPI mode is selected by default after device reset. Serial Peripheral Interface (SPI) protocol supports serial communication with external devices in half-duplex, full-duplex and simplex synchronization modes. This interface can be configured as master mode, in this case, it provides communication clock (SCK) to external slave device. The interface can also be operated in multiple configurations. I2S audio protocol, also a synchronous serial communication interface, uses three external signals. It supports four different audio standards, including Philips' I2S standard, MSB and LSB alignment standards and PCM standard. It can achieve half-duplex communication in master-slave mode. When I2S is used as a master device, it can provide a communication clock to an external slave device. The features are described as follows:

SPI main features Master device and slave device modes Three-wire full-duplex synchronous transmission Two-wire half-duplex synchronous transmission (two-way data line) Two-wire simplex synchronous transmission (one-way data line) 8-bit to 16-bit data size selection Multiple modes capability 8-bit master mode baud rate divider Slave mode frequency up to fpclk/2 In both master and slave modes, you can manage NSS by hardware or software:

dynamic changes of master/slave mode operation Programmable clock polarity and phase High-order or low-order can be set Special sending and receiving status flags, all support interrupt triggering SPI bus busy status flag 2020 WIRELESS-TAG TECHNOLOGY CO.,LIMITED All rights reserved. http://www.wireless-tag.com 20 WIRELESS-TAG TECHNOLOGY CO.,LIMITED V1.0.0 Supports SPI Motorola mode Hardware CRC can achieve reliable communication CRC value can be transmitted as the last byte of TX mode CRC automatically performs an error check to the last received byte. Supports Rx and TxFIFO, depth is 16 Supports DMA transfer Supports SPI TI mode I2S features Simplex communication (only send or receive) Master or slave operation 8-bit linear programmable frequency divider to achieve accurate audio sampling frequency (from 8kHz to 968kHz) The data format is 16-bit, 24-bit or 32-bit Fixed data frame of audio channel is 16-bit (16-bit data frame) or 32-bit (16-bit, 24-bit, 32-bit data frame) Programmable clock polarity (steady state) Underflow flag for slave transmission mode and overflow flag for receiving function

(master or slave) 16-bit transmit and receive registers, with one register at each end of the channel I2S protocol supported:

I2S Philips standard MSB alignment standard (left alignment) LSB alignment standard (right alignment) PCM standard (16-bit channel frame with long or short frame synchronization or 16-bit data frame extended to 32-bit channel frame) Data direction is always MSB first Supports sending and receiving DMA (16 bits wide) The main clock can be output to an external audio component. The rate is fixed at 256 times FS (where FS is the audio sampling frequency) Supports TX and RX FIFO, depth is 16 Provides 2-channel external clock inputs 4.19 Universal Asynchronous Receiver Transmitter(UART) The Universal Asynchronous Receiver Transmitter (UART) offers a flexible means of full-duplex data exchange with external equipment requiring an industry-standard NRZ asynchronous serial data format. 2020 WIRELESS-TAG TECHNOLOGY CO.,LIMITED All rights reserved. http://www.wireless-tag.com 21 WIRELESS-TAG TECHNOLOGY CO.,LIMITED V1.0.0 The UART offers a wide range of baud rates using a fractional baud rate generator. UART supports asynchronous communication and half-duplex single-wire communication. It also supports the LIN (local interconnection network), Smart Card Protocol and IrDA (infrared Data Association) SIR It also supports multiprocessor ENDEC specifications, and modem operations communication. High-speed data communication is possible by using the DMA for multibuffer settings.

(CTSn/RTSn). The features are described as follows:

Full duplex asynchronous communications 16-byte receive and transmit FIFO Compatible with 16C550 standard Programmable receiving buffer trigger point Supports independent baud rate programmable for each channel Supports automatic baud rate detection 12 interrupt sources Can use DMA Buffering the received/transmitted bytes in the reserved SRAM using DMA Built-in fractional baud rate generator covering wide range of baud rates without a need for external crystals of particular values Programmable transmit and receive baud rates up to 3MHz, min. 732Hz (clock frequency 48MHz) Supports hardware automatic flow control/flow control (CTSn, RTSn), RTSn control flow trigger point can be programmed Modem hardware automatic control RS485 transmit enable control Supports CTS wake-up function Supports IrDASIR mode Supports 3/16 bit periodic modulation Supports RS485 Supports 9-bit mode Multiprocessor communication Fully programmable serial interface features Programmable data bit number, namely 5-, 6-, 7-, 8-, 9-bit Parity control, odd, even, no parity or fixed parity generation and detection can be programmed Stop bit length can be programmed: 1, 2 bits; 0.5, 1.5 bits supported in Smartcard mode 2020 WIRELESS-TAG TECHNOLOGY CO.,LIMITED All rights reserved. http://www.wireless-tag.com 22 WIRELESS-TAG TECHNOLOGY CO.,LIMITED V1.0.0 Programmable bit order with MSB or LSB first Simple half duplex communication Switch TX / RX pin configuration Disconnection signal transmission ability of LIN master and disconnection signal detection ability of LIN slave When the UART is set to LIN mode, there are a 13-bit disconnect signal generator and disconnect signal detection functions Smartcard mode Support T=0 and T=1 Smartcard asynchronous protocol declared by ISO/IEC7816-3 standard 1.5 stop bit length used in Smartcard Supports ModBus communication Timeout detection function CR/LF character recognition Noise detection 4.20 Audio Interface (PDM) PDM (Pulse Density Modulation) is a modulation technique that uses digital signals to represent analog signals. PCM, also as a technique of converting analog to digital by taking regular samples at uniform intervals, expresses the amplitude of each sampled analog signal as N-bit digital component

(N=quantization depth). So the result of each sample in PCM method is always data of N-bit word length. PDM uses a clock with a sampling rate much higher than PCMs to sample and modulate the analog components, and only one bit is output, either 0 or 1. Therefore, digital audio expressed by PDM is also called Oversampled 1-bit Audio. Compared with a series of 0 and 1 in PDM, the quantization result of PCM is more intuitive and simple. 4.21 BLE BLE5.0/5.1 protocol. 2020 WIRELESS-TAG TECHNOLOGY CO.,LIMITED All rights reserved. http://www.wireless-tag.com 23 WIRELESS-TAG TECHNOLOGY CO.,LIMITED V1.0.0 5 Electrical Characteristics Parameter Description Operating Temperture Supply Voltage tR_SUP Current Consumption VIH VIL VOH VOL Source Current Sink Current Regualator supply input Power supply rise time

(0V to 3.3V) TX Mode @ 0dBm Output

(DCDC ON) RX Mode (DCDC ON) Standy Mode Low Power Mode2 Low Power Mode3 High Level Input Voltage Low Level Input Voltage High Level Output Voltage Low Level Output Voltage VESD Electrostatic discharge voltage Min

-40 1.8 0.8*VDD33 0 VDD33-0.4 Typ 3.3 4.3 4.5 2 1.1 0.7 30 60 8000 Max 105 3.6 330 VDD33 0.2*VDD33 VDD33 0.4 Unit V ms mA mA mA uA uA V V V V mA mA V 2020 WIRELESS-TAG TECHNOLOGY CO.,LIMITED All rights reserved. http://www.wireless-tag.com 24 WIRELESS-TAG TECHNOLOGY CO.,LIMITED 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 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 25 WIRELESS-TAG TECHNOLOGY CO.,LIMITED 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-WT055120-S1. 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 FCC Part 15 Subpart C 15.247 2.3 Specific operational use conditions The module is a Bluetooth module with BLE 2.4G function. BLE Specification Operation Frequency: 2402~2480MHz Number of Channel: 40 Modulation: GFSK Type: PCB Antenna Gain: 4.35 dBi The module can be used for mobile or applications with a maximum 4.35dBi 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. 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 26 WIRELESS-TAG TECHNOLOGY CO.,LIMITED integrates this module. The end user manual shall include all required regulatory information/warning as show in this manual. 2.4 Limited module procedures Not applicable. 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:

Type: PCB Antenna Gain: 4.35 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-WT055120-S1 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 27 WIRELESS-TAG TECHNOLOGY CO.,LIMITED 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. 28 EU warnings and DOC declarations EU Caution 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 product, 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. The device complies with RF specifications when the device used at 20cm form your body. Declaration of Conformity Hereby, Wireless-Tag Technology Co., Ltd declares that the product type WT055120-S1 is in compliance with Directives 2014/53/EU. The full text of the EU declaration of conformity is available at the following internet address::www.wireless-tag.com Manufacturer Information Manufacturer's Name: Wireless-Tag Technology Co., Ltd Address:801, Block A, Building 6, Shenzhen International Innovation Valley, Dashi Road, Xili Community, Xili Street, Nanshan District, Shenzhen Rf specifications RF specification:

Function BLE Operation Frequency Max RF outputpower 2402-2480MHz 6.64 dbm

:9.8*12mm Stick on the product shield cover (red box in the picture) BLE Module Module: WT055120-S1 Input:3.3V 0.5A FCC ID:2AFOS-WT055120-S1 WIRELESS-TAG TECHNOLOGY CO., LIMITED 801, Block A, Building 6, Shenzhen International Innovation Valley, Dashi 1st Road, Xili Community, Xili Street, Nanshan District, Shenzhen. Importer: xxxxxxxx Address: xxxxxxxxx

C5266091_X10_Ed.1 WIRELESS-TAG TECHNOLOGY CO., LIMITED. Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 Subject: Request for Confidentiality FCC ID: 2AFOS-WT055120-S1 To Whom It May Concern, Date: 8/26/2022 Pursuant to the provisions of Sections 0.457 and 0.459 of Commission's rules

(47CFR0.457, 0.459), we are requesting the Commission to withhold the following attachment(s) as confidential document from public disclosure. Exhibits ID Label/Location Attestation Statement External Photos Block Diagram Schematics Test Report Test Setup Photos Users Manual Internal Photos Parts List / Tune Up RF Exposure Info Operational Description Cover Letter(s) SDR Software / Security Info Long-Term Confidentiality No No No Short-Term Confidentiality No No No No No No No No Above mentioned document contains detailed system and equipment description are considered as proprietary information in operation of the equipment. The public disclosure of above documents might be harmful to our company and would give competitor an unfair advantage in the market. It is our understanding that all measurement test reports, FCC ID label format and correspondent during certification review process cannot be granted as confidential documents and those information will be available for public review once the grant of equipment authorization is issued. Sincerely, Signature:

Name: Louie Wang Date: 8/26/2022 Title: Manager 1/1

C5266091_X8_Ed.1 Letter of Authorization Company: WIRELESS-TAG TECHNOLOGY CO., LIMITED. Address: 801, Block A, Building 6, Shenzhen International Innovation Valley, Dashi 1st Road, Xili Community, Xili Street, Nanshan District, Shenzhen. Product Name: BLE Module Model Number: WT055120-S1 FCC Identifier: 2AFOS-WT055120-S1 We authorize LGAI Technological Center S.A., Ronda de la Font del Carme, s/n, 08193 Bellaterra, Spain, to act on our behalf on all matters concerning the above named equipment. Any individual within LGAI Technological Center S.A. is authorized to act on our behalf and take action on the application. We declare that authorize LGAI Technological Center S.A., Ronda de la Font del Carme, s/n, 08193 Bellaterra, Spain, is allowed to forward all information related to the approval project to the Federal Communication Commission and to discuss any issues concerning the approval application. Any and all acts carried out by LGAI Technological Center S.A. on our behalf shall have the same effect as acts of our own. Name: Louie Wang Date: 8/26/2022 Title: Manager Signature of applicant:

1/1

C5266091_X9_Ed.2 WIRELESS-TAG TECHNOLOGY CO., LIMITED Modular Transmitter Approval Request Federal Communications Commission Equipment Authorization Branch 7435 Oakland Mills Road Columbia, MD 21046 Company name: WIRELESS-TAG TECHNOLOGY CO., LIMITED FCC ID: 2AFOS-WT055120-S1 Gentlemen, In accordance with 47CFR 15.212 Modular Transmitters and KDB 996369 D01 Module Certification Guide V02. FCC ID: 2AFOS-WT055120-S1 has been examined against the following requirements. Items to be covered by Single modular transmitters. Requirement per 15.212 and KDB 996369 D01 Modular Certification Guide v02 1. The radio elements must have the radio frequency circuitry shielded. Physical components and tuning capacitor(s) may be located external to the shield, but must be on the module assembly 2. The module must have buffered modulation/data inputs to ensure that the device will comply with Part 15 requirements with any type of input signal 3. The module must contain power supply regulation on the module 4. The module must contain a permanently attached antenna, or contain a unique antenna connector, and be marketed and operated only with specific antenna(s), per Sections 15.203, 15.204(b), 15.204(c), 15.212(a), 2.929(b) 5. The module must demonstrate compliance in a stand-

alone configuration 6. The module must be labelled with its permanently affixed FCC ID label, or use an electronic display (See KDB Publication 784748 about labelling requirements) 7. The module must comply with all specific rules applicable to the transmitter including all the conditions provided in the integration instructions by the grantee 8. The module must comply with RF exposure requirements Explanation from Grantee

(do not write yes/no, but explain why product complies/how it is achieved) Yes, The module has its own RF shield Yes, The module has data transmission function and supports 2.4G BLE function. Module with power regulation and support for DC 3.3V input The module meets the antenna requirements. The module has been tested in a standalone configuration, see report for details The module has its own FCC ID number. See the label for details. The module meets any specific rules or operational requirements applicable to the transmitter Answer: The module complies with any applicable RF exposure requirements, as detailed in the instructions. Name: Louie Wang Date: 2022-8-26 Title: Manager Signature of applicant 1/1