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www.wireless-tag.com WT52840-S1

Wireless-Tag Technology www.wireless-tag.com technical@wireless-tag.com

Wireless-Tag WT52840-S1

Bluetooth Low Energy 5.0 Module

DATASHEET

Overview:

WT52840-S1 is a high-performance, ultra-low energy (Bluetooth Low Energy) RF transceiver system

module that uses Nordic’s nRF52840 as the core processor. The overall size is 27.28*18.74*2.30,

which is suitable for most application scenarios with volume requirements. The module supports

Bluetooth S140 SoftDevice, a Bluetooth 5.0 pre-qualified protocol stack.

The module is used as a master or a slave, and the client’s MCU is connected to the module

through the UART port. When the module is used as a master, it can scan and search for the

broadcast of our WT52810-S1, WT52832-S2, WT52840-S1 series modules to establish a connection.

After successful connection, the two-way communication between the two modules can be realized

through the serial port. The user can exchange data or control the communication parameters of

the module through the UART port. The meaning of the data is defined by the upper application

user. When the module is used as a slave, it can be connected by other mobile devices or master

modules. App or master data will be received by the module and pushed to MCU through UART.

After the module receives the data packet from the serial port of the client’s MCU, it will

automatically forward it to the mobile device or master.

Features:

 Operating temperature: -25℃~75℃，typical 25℃

 CPU: nRF52840-QIAA（32-bit ARM Cortex-M4F processor）

 Memory: 1MB flash + 256KB RAM memory

 Transparent transmission（Bridged method），easy and fast to use even for developers without

Bluetooth protocol stack development experience;

 Adopt standard UART（TTL） interface, bidirectional data reading and simple to operate;

 Support serial AT commands, users can modify the module's serial port baud rate（default

115200bps）, name, MAC address and other basic parameters;

 Support master mode or slave mode;

 Serial data packet length: single data packet can support data length up to 244bytes;

 Operating distance: 0~45m, class II level;

 System: support Android and IOS;

 Supply voltage: 2.0～3.6V（3.3V typical）;

 The module comes with a PCB antenna, and an external antenna can also be used

(customization required);

 Module size：27.28*18.74*2.30mm

 Sleep current: 0.3uA

Summary of content (32 pages)

PAGE 1
www.wireless-tag.com WT52840-S1 Wireless-Tag WT52840-S1 Bluetooth Low Energy 5.0 Module DATASHEET Overview: WT52840-S1 is a high-performance, ultra-low energy (Bluetooth Low Energy) RF transceiver system module that uses Nordic’s nRF52840 as the core processor. The overall size is 27.28*18.74*2.30, which is suitable for most application scenarios with volume requirements. The module supports Bluetooth S140 SoftDevice, a Bluetooth 5.0 pre-qualified protocol stack.
PAGE 2
www.wireless-tag.com WT52840-S1 Applications:  Electronic scales  Electronic cigarettes  Smart cups  Smart bracelets  Smart watches  Bluetooth toys  Intelligent hardware  Smart home Wireless-Tag Technology www.wireless-tag.com 2 / 27 technical@wireless-tag.
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www.wireless-tag.com Version 0.0.1 Author Brussin Wireless-Tag Technology Revision History Date August 14, 2020 www.wireless-tag.com WT52840-S1 Description First release 3 / 27 technical@wireless-tag.
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www.wireless-tag.com WT52840-S1 Contents 1. Working Mode Diagram...............................................................................................6 2. Module Pin Definitions and Module Size................................................................... 7 2.1 Pin Description........................................................................................................................... 7 2.2 Module Package Size.....................................................................
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www.wireless-tag.com WT52840-S1 7. Error CODE Description............................................................................................ 18 8. Bluetooth Module Application Examples................................................................ 18 9. Appendix.....................................................................................................................27 Wireless-Tag Technology www.wireless-tag.com 5 / 27 technical@wireless-tag.
PAGE 6
www.wireless-tag.com WT52840-S1 1. Working Mode Diagram Master Mode VCC VCC MCU UART-TX BLE 5.0 Application UART-RX Module Circuit ENABLE BLE 5.0 Master BLE 5.0 UART-TX MCU Module UART-RX Application Slave ENABLE Circuit GND GND Slave Mode VCC MCU Application Circuit UART-TX UART-RX ENABLE APP BLE 5.0 Module BLE 5.0 Slave BLE Master GND Wireless-Tag Technology www.wireless-tag.com 6 / 27 technical@wireless-tag.
PAGE 7
www.wireless-tag.com WT52840-S1 2. Module Pin Definitions and Module Size Bottom view 2.1 Pin Description Chip Pin Module Pin VDD_NRF VDD DC 2.0~3.6V GND GND Ground P0.04 ENABLE Serial port enabling pin, pull it up to activate the Function Description module serial port functions, pull it down to close the serial port, the module power consumption is reduced P0.06 TXD UART--TX P0.08 RXD UART--RX P0.
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www.wireless-tag.com WT52840-S1 SWDCLK SWDCLK Debug clock signal input SWDIO SWDIO Debug Interface 2.2 Module Package Size Tolerance 0.1mm Wireless-Tag Technology www.wireless-tag.com 8 / 27 technical@wireless-tag.
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www.wireless-tag.com WT52840-S1 2.3 Reflow Soldering Reference Diagram 3. Module Power Consumption Description To control the power consumption of the module, when the serial port enable pin (enable) is at a low level, the UART of the module is closed；At this time, the serial port data and AT commands cannot be sent normally, but the serial port can receive the Bluetooth transparent data normally.
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www.wireless-tag.com WT52840-S1 4-2. In order to save volume, the module adopts TXD/RXD dual-wire serial port mode, without increasing data flow control, it is recommended that the serial port rate should not be set too high to avoid packet loss problems. It is recommended to use 115200bps, and the highest can be set to 250000bps; 4-3. The default Bluetooth connection interval time of the module is 45ms.
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www.wireless-tag.
PAGE 12
www.wireless-tag.com WT52840-S1 5.4 Serial Baud Rate Operation Command Command format： AT+BAUD=115200\r\n Return value： OK\r\n ERR:CODE\r\n Content: Modify the serial baud rate of the module communication to 115200bps. Returning value OK indicates that the modification has been successful, and returning value ERR indicates that the new serial baud rate has failed to be modified because the set value is not commonly used serial baud rate value.
PAGE 13
www.wireless-tag.com WT52840-S1 modified after disconnecting the module. 5.7 Bluetooth Name Operation Command Command format： AT+NAME=WT52840-S1\r\n Return value： OK\r\n ERR:CODE\r\n Content: Rename the module as: WT52840-S1，the length of the name does not exceed 22 bytes; Return value ERR indicates renaming failed. The reason is that the length has exceeded the length limit or Bluetooth has been connected.
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www.wireless-tag.com WT52840-S1 5.10 Master Scanning Operation Command Command format： AT+SCAN_START\r\n Return value： OK\r\n ERR:CODE\r\n Content：Start Bluetooth scanning. It can be operated in master mode and Bluetooth is not connected. Command format： AT+SCAN_STOP\r\n Return value： OK\r\n ERR:CODE\r\n Content：Stop Bluetooth scanning. It can be operated in master mode and Bluetooth is not connected. 5.11 Set Bluetooth Connection Interval Time Command Command format： AT+CIT=100\r\n Return value： O
PAGE 15
www.wireless-tag.com WT52840-S1 ERR:7\r\n（Parameter not set） Content：Query the MAC address of the target device in master mode, little-endian. Command format： AT+DISCONN\r\n Return value： OK\r\n ERR:CODE\r\n Content： Disconnect the current Bluetooth connection. It is valid in the connection state. 5.13 Transmit Power Operation Command Command format： AT+RFPM=4\r\n Return value： OK\r\n ERR:CODE\r\n Content： Modify the transmit power of the module to 4dBm.
PAGE 16
www.wireless-tag.com WT52840-S1 effective after restarting. 5.15 Custom Advertising Data Command Command format： AT+ADD=0123456A\r\n Return value： OK\r\n ERR:CODE\r\n Content： Users can add the custom advertising data to the Bluetooth advertising data. For example, add the data of 0123456A to the Bluetooth advertising data, and return OK to indicate that it has been added successfully. After the setting is successful in slave mode, Bluetooth will start broadcasting with the new configuration.
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www.wireless-tag.com WT52840-S1 5.18 Set Low Power Sleep Mode Command Command format： AT+SLEEP\r\n Return value： OK\r\n Content： When the module is in the idle state, in order to reduce the power consumption, the module can be set to enter the sleep mode by the sleep command. At this time, the Bluetooth and serial port functions are turned off, and the power consumption is reduced. The module can be awakened by external enabling. The power consumption in sleep mode is 0.3uA. 5.
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www.wireless-tag.com WT52840-S1 7. Error CODE Description Err CODE Description Reason 1 Invalid input 2 Unsupported command 3 Parsing commands is not allowed in the current state 4 The command is not allowed in Some commands are not allowed in the current state the Bluetooth connection status. You need to disconnect the Bluetooth before operating.
PAGE 19
www.wireless-tag.com WT52840-S1 install the driver of the FTDI chip first. After the driver is installed successfully, connect DEMO-Kit to PC by a USB cable. At this time, the serial port label of Demo Kit tool can be recognized by PC terminal; 4. Start the serial port debugging tool on PC, select the virtual COM port number mapped by the FTDI chip. Set the serial port parameters as: baud rate 115200, the data format is 8 data bits, no parity bit and 1 stop bit.
PAGE 20
www.wireless-tag.com WT52840-S1 Click on the slave that needs to be connected, the iPhone will connect to the slave, and then the program will automatically search for all services of the slave, as shown below. Wireless-Tag Technology www.wireless-tag.com 20 / 27 technical@wireless-tag.
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www.wireless-tag.com WT52840-S1 Click the corresponding service to display the characteristics contained in the service, as shown in the figure below. Wireless-Tag Technology www.wireless-tag.com 21 / 27 technical@wireless-tag.
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www.wireless-tag.com WT52840-S1 Click “Writer new value” to enter the Characteristic communication interface and input a value, as shown in the figure below: Wireless-Tag Technology www.wireless-tag.com 22 / 27 technical@wireless-tag.
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www.wireless-tag.com WT52840-S1 After the module receives the data sent by LightBlue, it pushes the received data to the serial port through DEMO-KIT, and displays it in the serial debugging tool on PC: Wireless-Tag Technology www.wireless-tag.com 23 / 27 technical@wireless-tag.
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www.wireless-tag.com B. WT52840-S1 In the Android system (Andorid 4.3 and above, only supports Bluetooth 4.0; Andorid 6.0 and above, you need to turn on the GPS service to search for Bluetooth) nrfconnect can be used as an APP debugging tool. The way to obtain APK and source code is: https://github.com/NordicSemiconductor/Android-nRF-Connect/releases?tdsourcetag=s_pctim_ai omsg Wireless-Tag Technology www.wireless-tag.com 24 / 27 technical@wireless-tag.
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www.wireless-tag.com WT52840-S1 Click SCAN to search for the Bluetooth device: Click CONNECT to establish a connection with the Bluetooth device: Wireless-Tag Technology www.wireless-tag.com 25 / 27 technical@wireless-tag.
PAGE 26
www.wireless-tag.com WT52840-S1 After the connection is successful, expand the 0x2214 service and turn on the NOTIFY channel: At this time, the NOTIFY channel can receive the serial port data, or send data to the serial port through the WRITE, WRITE NO RESPONSE channel. Wireless-Tag Technology www.wireless-tag.com 26 / 27 technical@wireless-tag.
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www.wireless-tag.com WT52840-S1 9. Appendix For more technical support, please email to: technical@wireless-tag.com Wireless-Tag Technology www.wireless-tag.com 27 / 27 technical@wireless-tag.
PAGE 28
FCC WARNING 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. Any changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment.
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Integration instructions for host product manufacturers according to KDB 996369 D03 OEM Manual v01 2.2 List of applicable FCC rules FCC Part 15 Subpart C 15.247 & 15.207 & 15.209 2.3 Specific operational use conditions The module is a Bluetooth module with BLE function. Operation Frequency: 2402-2480MHz Number of Channel: 40 Modulation: GFSK Type: PCB Antenna Gain: 1dBi Max. The module can be used for mobile or portable applications with a maximum 0.5dBi antenna.
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2.8 Label and compliance information Host product manufacturers need to provide a physical or e-label stating “Contains FCC ID: 2AFOSWT52840-S1” with their finished product. 2.
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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.
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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.