Lierda WB11 Series FSK Transmissive Modules Hardware Design Manual

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This product complies with the design requirements regarding environmental protection and personal safety. The storage, use and disposal of the product should be carried out in accordance with the requirements of the product manuals, relevant contracts or relevant laws and regulations.

Lierda reserves the right to make changes and improvements to the products described in this manual without prior notice; it also reserves the right to revise or withdraw this manual at any time.

Document Revision History

Safety Instructions

It is the user's responsibility to follow the relevant regulations of other countries and the specific environmental regulations for the use of wireless communication modules and equipment. By observing the following safety principles, you can ensure your personal safety and help to protect the product and the working environment from potential damage. Lierda is not liable for damages related to the customer's failure to comply with these regulations.

• ? Safety on the road: When driving, do not use hand-held mobile terminal devices unless they have a hands-free function. Please stop the car before making a call!
• ✈️ Air travel: Please turn off your mobile devices before boarding the airplane. The wireless function of mobile devices is prohibited on board to prevent interference with the aircraft's communication system. Ignoring this reminder may lead to flight safety or even violate the law.
• ⚕️ Healthcare settings: When in a hospital or health care setting, note if there are restrictions on the use of mobile devices. RF interference can cause medical equipment to malfunction, so it may be necessary to turn off the mobile device.
• ? Emergency situations: The mobile device does not guarantee a valid connection in all circumstances, for example if the mobile device is out of credit or the SIM is invalid. When in an emergency situation, please remember to use the emergency call and make sure that your device is switched on and in an area with sufficient signal strength.
• ? RF Interference: Your mobile device receives and transmits RF signals when it is switched on, which can cause RF interference when in close proximity to TVs, radios, computers, or other electronic devices.
• ? Flammable environments: Keep the mobile terminal unit away from flammable gases. Turn off the mobile device when you are near gas stations, oil depots, chemical plants, or explosive workplaces. It is a safety hazard to operate electronic devices in any place where there is a potential explosion hazard.

Applicable Module Selection

1 Introductory

This document defines the standard application development specifications for the Lierda WB11 series FSK Transmissive Module, describing its hardware interface, electrical characteristics, application methods, and mechanical specifications.

This document can help users quickly understand the hardware interface specifications, electrical and mechanical characteristics of the module and other related information. Combined with other corresponding documents, users can quickly master the application development method of the WB11 series module.

2 Product Overview

The Lierda WB11 series FSK transmitting modules are characterized by reliability and high speed, making them widely usable in wireless intelligent public networks and other fields.

2.1 Key Features

2.2 Function Block Diagram

The diagram illustrates the interconnection of RF Chips, RF front-end, ANT, MCU, SPI, and UART components, along with power and I/O connections.

2.3 Pinouts

Refer to section 2.4 Module Pin Description for detailed pin information.

2.4 Module Pin Description

2.4.1 UART

2.4.2 Power

2.4.3 SWD Interface

2.4.4 Functional interfaces

2.4.5 Antenna Interface

Note on Pin Types: "O"=Output, "I"=Input, "P"=Power, "G"=Ground.

3 Working Characteristics

3.1 Operating Mode

3.2 Temperature Compensation

The module features a temperature compensation function that calibrates the frequency at different temperatures, allowing proper communication in the range of -40°C to 105°C.

3.3 Power

VDD is the power supply input for the entire module, and its performance directly affects the module's operation. When designing, select a power supply capable of providing at least 200mA to ensure the input voltage to VDD does not drop below the minimum operating voltage, preventing abnormal module behavior due to voltage drop.

If the voltage difference between the input and the module's supply voltage is not large, an LDO is recommended. For larger voltage differences, use DC-DC conversion, paying attention to potential EMI issues.

For optimal power supply performance, the VBAT input reference circuit is provided.

PCB Design Considerations: For VDD alignment, ensure longer traces and wider line widths to meet current capacity (>200mA). A line width of at least 0.2mm (1 ounce copper thickness) is recommended. The GND plane should be as complete as possible with ample holes. Keep capacitors close to the module's VDD pins.

3.4 Reset

The module resets when the RSTn pin is held low for more than 100µs (T1). An external key or IO can be used to generate a low-level continuous pulse for resetting the module.

After the RSTn pin is pulled high, the BUSY signal will go high within 100ms (T2). Users must wait for BUSY to go low before operating the module normally.

Timing Diagram Description: The diagram shows the RSTn signal transitioning low, triggering a reset, followed by the BUSY signal going high (T2) and then low, indicating readiness.

4 Application Interfaces

4.1 UART

The module's serial port operates at a 3.3V level with a baud rate of 115200bps, used for command transmission and data transfer.

• UART_TXD: The module sends data to the user device.
• UART_RXD: The module receives data from the user's device.

The connection between the external serial port and the module serial port is illustrated in the diagram.

Connection Diagram Description: A diagram shows a "Terminal" with TXD, RXD, and GND pins connected to a "Module" with corresponding UART_TXD, UART_RXD, and GND pins.

If the customer's serial port is not a 3.3V level, a serial port level conversion circuit is required.

5 Parameters

5.1 Absolute Maximum Limit Value

The maximum load values provided indicate the limits the device can withstand. Prolonged operation under these conditions may affect device reliability.

5.2 Operating Parameters

Digital Logic Level Characterization

5.3 RF Characterization

Note:

• The above test conditions are: temperature: 25℃, center frequency: 868MHz/915MHz, operating voltage: 3.3V.
• Users are allowed to configure and use the frequency band according to local regulations. Compliance with local regulations is mandatory. If regulations prohibit the use of a specific frequency band, Lierda assumes no responsibility. For domestic terminal market applications, refer to the "micropower short-range radio transmitting equipment catalog and technical requirements".

6 Mechanical Dimension

Mechanical Dimension Drawing Description: The drawing provides detailed dimensions of the module in millimeters, including length, width, height, and hole sizes.

7 Production and Packaging Information

7.1 Production Welding

Stencil opening design

The stencil thickness on the base plate is selected based on the device packaging type. Key requirements include:

• Module pad locations can be locally thickened to 0.15~0.20mm to avoid void soldering.

Reflow soldering work instructions

(This work instruction is for lead-free work only and is for reference only.)

Reflow Soldering Diagram Description: The diagram shows a Standard Operation Procedure (SOP) for reflow soldering, detailing temperature profiles with zones, ramp-up, soaking, peak temperature, conveyor speed, and temperature ranges for different stages. It also lists required tools/equipment such as a temperature measuring instrument and heat-resistant gloves.

7.2 Product Model Information Sheet

Federal Communication Commission (FCC) Radiation Exposure Statement

When using the product, maintain a distance of 20cm from the body to ensure compliance with RF exposure requirements.

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.

NOTE: The manufacturer is not responsible for any radio or TV interference caused by unauthorized modifications or changes to this equipment. Such modifications or changes could void the user's authority to operate the equipment.

NOTE: 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 or more 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.

ORIGINAL EQUIPMENT MANUFACTURER (OEM) NOTES

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.

The OEM must certify the final end product to comply with unintentional radiators (FCC Sections 15.107 and 15.109) before declaring compliance of the final product to Part 15 of the FCC rules and regulations. Integration into devices that are directly or indirectly connected to AC lines must add with Class II Permissive Change.

The OEM must comply with the FCC labeling requirements. If the module's label is not visible when installed, then an additional permanent label must be applied on the outside of the finished product which states: "Contains transmitter module FCC ID: 2AOFDWB11-8P." Additionally, the following statement should be included on the label and in the final product's user manual: "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 interferences, and (2) this device must accept any interference received, including interference that may cause undesired operation.".

The module is allowed to be installed in mobile and portable applications. A module or modules can only be used without additional authorizations if they have been tested and granted under the same intended end-use operational conditions, including simultaneous transmission operations. When they have not been tested and granted in this manner, additional testing and/or FCC application filing may be required. The most straightforward approach to address additional testing conditions is to have the grantee responsible for the certification of at least one of the modules submit a permissive change application. When having a module grantee file a permissive change is not practical or feasible, the following guidance provides some additional options for host manufacturers. Integrations using modules where additional testing and/or FCC application filing(s) may be required are: (A) a module used in devices requiring additional RF exposure compliance information (e.g., MPE evaluation or SAR testing); (B) limited and/or split modules not meeting all of the module requirements; and (C) simultaneous transmissions for independent collocated transmitters not previously granted together.

This Module is full modular approval, it is limited to OEM installation ONLY. Integration into devices that are directly or indirectly connected to AC lines must add with Class II Permissive Change. (OEM) Integrator has to assure compliance of the entire end product include the integrated Module. Additional measurements (15B) and/or equipment authorizations (e.g. Verification) may need to be addressed depending on co-location or simultaneous transmission issues if applicable. (OEM) Integrator is reminded to assure that these installation instructions will not be made available to the end user.

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