SAMSUNG A3LWCD940M Highly Integrated Single Chip User Manual

SAMSUNG A3LWCD940M Highly Integrated Single Chip

Specifications

• Chipset: MediaTek MT7921AUN
• Wireless Standards: 802.11a/b/g/n/ac/ax, Bluetooth 5.2
• Package Size: 11.5×8.7 DRQFN 109 pins
• Power Supply: Single 3.3V input
• Platform: 32-bit RISC MCU, USB v3.0 compliant
• RF Software Support: Ad-hoc, Wi-Fi Direct, DFS channels
• FCC Approval: Yes

Product Usage Instructions

Connecting the Module

To use the WCD940M module, ensure it is correctly connected to your device’s power source. Do not install it in a weatherized enclosure or attempt to operate it from a battery source.

Wireless Connectivity

The module offers wireless connectivity through Wi-Fi and Bluetooth technology. Ensure proper antenna placement and follow FCC guidelines for interference prevention.

Software Restrictions

• The device supports Ad-hoc and Wi-Fi Direct for specific bands.
• It operates as a client in DFS channels and has limitations on peer-to-peer modes.

Frequently Asked Questions

Q: Can the module be used in peer-to-peer modes?

A: The module does not support peer-to-peer modes like Hotspot or Wi-Fi Direct Group Owner in certain bands as per FCC regulations.

Q: What power supply does the module require?

A: The module operates on a single 3.3V power supply input.

Q: Is the module compliant with FCC regulations?

A: Yes, the module has FCC approval and meets the requirements specified in Part 15 of the FCC’s Rules.

Introduction

WCD940M is a highly integrated single chip that features a low power 2×2 11a/b/g/n/ac/axe dual-band Wi-Fi subsystem and a Bluetooth v5.2 subsystem, offering feature-rich wireless connectivity at high standards, and delivering reliable, cost-effective throughput from an extended distance.
The core chipset is from MediaTek part number MT7921AUN.

Hardware Architecture

Main Chipset Information

MT7921AUN

Operational Description

WCD940M is the 802.11a/b/g/n/ac/axe +Bluetooth 5.2 Combo Module that acts as a communication controller for users of a wireless device to connect to SMART TV

Features

• Technology and package
  • 11.5×8.7 DRQFN 109 pins package

Power management and clock source

• Integrate a high-efficiency power management unit with a single 3.3V power supply input.
• Support 40MHz crystal clock with low power operation in idle mode
• Buffered clock output for co-clock with other SOC chipset

Platform

• 32-bit RISC MCU for Wi-Fi/Bluetooth protocols and Wi-Fi offload
• Embedded SRAM/ROM
• UART interface with hardware flow control
• Programmable and multiplexed GPIO pins
• MT7921AUN – USB device fully compliant with USB v3.0 specification

Approval Statement

FCC approval

RF Software restrictions

This device can support Ad-hoc and Wi-Fi Direct for 2.4GHz, UNII 1 and UNII 3 bands.
The device operates strictly as a client in DFS channels (with passive scan). It does not support ad-hoc, Wi-Fi Direct Group Owner, Hotspot or any other peer-to-peer modes that may initiate a network in DFS channels(UNII2-2A and UNII2-2C band)
This device complies with Part 15 of the FCC`s Rules. Operation is subject to the following two Conditions:

1. This device may not cause harmful interference
2. This device must accept any interference received, including interference that may cause undesirable operation.

To satisfy FCC exterior labelling requirements, the following text must be placed on the exterior of the end product. Contains Transmitter module FCC ID: A3LWCD940M
This equipment has been tested and found to comply with the limits for a Class B digital device, according 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 under 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 the receiver.
• Connect the equipment to 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.
• The OEM integrator is responsible for ensuring the end user has no manual instruction to remove or install the module.
• The module is limited to installation in mobile or fixed applications.

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.
This transmitter must not be co-located or operating in conjunction with any other antenna or transmitter.

This device meets all the other requirements specified in Part 15E, Section 15.407 of the FCC Rules.
This module cannot be installed in a weatherized enclosure and cannot operate from a battery but only power sources.
The host device must be connected to a power source as it has no battery.

This module is intended for OEM integrators only. Per FCC KDB 996369 D03 OEM Manual v01 guidance, the following conditions must be strictly followed when using this certified module:

KDB 996369 D03 OEM Manual v01 rule sections:

List of applicable FCC rules

• This module has been tested for compliance with CFR 47 FCC Part 15 C (15.247, DTS and DSS) and CFR 47 FCC Part 15 E (NII). It applies to the modular transmitter

Summarize the specific operational use conditions

• The module is tested for standalone mobile RF exposure use conditions. Any other usage conditions such as co-location with another transmitter (s) will need a separate reassessment through a class II permissive change application or new certification.

Further operation restrictions on the host product include:

• Prohibited for control of or Communications with unmanned aircraft systems.
• This radio transmitter FCC ID: A3LWCD940M has been approved by the Federal Communications Commission to operate with the integrated PCB antenna.
• Use of any other antenna is strictly prohibited without applying for a new system-specific FCC ID.
• Limited module procedures are Not applicable.
• The module complies with FCC Part 15.247 / Part 15.407 and applies for Single module approval.
• Trace antenna designs Not applicable.
• The antenna is integrated into the module and cannot be modified. See section 2.3.

RF exposure considerations

• This equipment complies with FCC mobile radiation exposure limits set forth for an uncontrolled environment.
• This equipment should be installed and operated with a minimum distance of 20cm between the radiator & your body. A separate SAR/Power Density evaluation is required to confirm compliance with relevant FCC portable RF exposure rules.

Antennas

1. Note 1: Use of other antenna types or the same type of antenna with higher gain than listed above must perform additional testing and appropriate permissive change approval.
2. Note 2: Additional testing/submission (C2PC) will be required if the device does not meet the antenna and RF exposure requirements.
3. Note 3: Contact Samsung for additional guidance, if choose to use different antenna types or higher/lower gain antennas in the end system.

IMPORTANT: The final host product must have an integral antenna that is not removable by the end user.

Antenna Type & Antenna Gain BT&BLE:

Note: The antennas are permanently attached and can’t be replaced.

WIFI:

Note: The antennas are permanently attached and can’t be replaced.

WIFI:

Note: The antennas are permanently attached and can’t be replaced.

Label and compliance information

• The end product must be labelled in a visible area with the following: “Contains FCC ID: A3LWCD940M”. The grantee’s FCC ID can be used only when all FCC compliance requirements are met.

Information on test modes and additional testing requirements

• This transmitter is tested in a standalone mobile RF exposure condition and any co-located or simultaneous transmission with other transmitters need class II permissive change re-evaluation or new certification.

Additional testing, Part 15 Subpart B disclaimer

• This transmitter module is tested as a subsystem and its certification does not cover the FCC Part 15 Subpart B (unintentional radiator) rule requirement applicable to the final host.
• The final host will still need to be reassessed for compliance with this portion of rule requirements if applicable.
• If all conditions above are met, further transmitter tests 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.
• IMPORTANT NOTE: If these conditions cannot be met (for example certain laptop configurations or co-location with another transmitter), then the FCC authorization is no longer considered valid and the FCC ID 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.

Note EMI Considerations

• The host manufacturer is recommended to use the D04 Module Integration Guide recommended as “best practice”
• RF design engineering testing and evaluation in case non-linear interactions generate additional non-compliant limits due to module placement to host components or properties.

How to make changes

• This module is stand-alone modular. If the end product will involve Multiple simultaneous transmitting conditions or different operational conditions for a stand-alone modular transmitter in a host, the host manufacturer has to consult with the module manufacturer for the installation method in the end system.

Manual Information to the End User

• The OEM integrator must 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 that integrates this module.
• The end user manual shall include all required regulatory information/warnings as shown in this manual.

OEM/Host manufacturer responsibilities

• OEM/Host manufacturers are ultimately responsible for the compliance of the Host and Module.
• The final product must be reassessed against all the essential requirements of the FCC rule such as FCC Part 15 Subpart B before it can be placed on the US market. This includes reassessing the transmitter module for compliance with the Radio and EMF essential requirements of the FCC rules. This module must not be incorporated into any other device or system without retesting for compliance as multi-radio and combined equipment.
• Modules: extended to host manufacturers by integration instructions.

IMPORTANT NOTE

This device complies with FCC & IC radiation exposure limits set forth for an uncontrolled environment. This device should be installed and must not be co- located or operating in conjunction with any other antenna or transmitter.
This device is intended only for OEM integrators under the following conditions:

1. This module may not be co-located with any other transmitters or antennas.
2. The antenna must be installed such that 20cm is maintained between the antenna and users.

As long as the 2 conditions above are met, further transmitter tests will not be required. However, the OEM integrator is still responsible for testing their end product for any additional compliance requirements with this module installed. If these conditions cannot be met, then the FCC & IC authorizations are no longer considered valid, and the FCC ID cannot be used on the final product. In these circumstances, the OEM integrator will be responsible for re-evaluating the end product including this module and obtaining separate FCC & IC authorizations.

IC approval

This device contains license-exempt transmitter(s)/receiver(s) that comply with Innovation, Science and Economic Development Canada’s license-exempt RSS(s). Operation is subject to the following two conditions:

1. This device may not cause interference.
2. This device must accept any interference, including interference that may cause undesired operation of the device.

User Information

Caution: Any changes or modifications not expressly approved by the party responsible for compliance could void the user`s authority to operate this equipment.

Antenna Type & Antenna Gain BT&BLE:

Note: The antennas are permanently attached and can’t be replaced.

2.4G WIFI:

Note: The antennas are permanently attached and can’t be replaced.

5G WIFI:

Note: The antennas are permanently attached and can’t be replaced.

• Please notice that if the ISED certification number is not visible when the module is installed inside another device, then the outside of the device into which the module is installed must also display a label referring to the enclosed module.
• This exterior label can use wording such as the following: “Contains IC: 12290A-WXT2L” Any similar wording that expresses the same meaning may be used.
• The device for operation in the band 5150-5250 MHz is only for indoor use to reduce the potential for harmful interference to co-channel mobile satellite systems
• Users should also be advised that high-power radars are allocated as primary users (i.e. priority users) of the bands 5250-5350 MHz and 5650-5850 MHz and that these radars could cause interference and/or damage to LE-LAN devices.
• The device meets the exemption from the routine evaluation limits in section 2.5 of RSS 102 and compliance with RSS-102 RF exposure, users can obtain Canadian information on RF exposure and compliance.
• This transmitter must not be co-located or operating in conjunction with any other antenna or transmitter. This equipment should be installed and operated with a minimum distance of 20 centimetres between the radiator and your body.

CE approval

• This device is restricted to indoor use only within the 5.15 ~ 5.35GHz Band. (Europe)
• Samsung Electronics Co Ltd declares that the radio equipment type(WCD940M) complies with Directive 2014/53/EU. The full text of the EU Declaration of Conformity is available at the following internet address:

Frequency Range and Maximum Output Power (EIRP)

• 2400 MHz to 2483.5 MHz: Below 20 dBm for Bluetooth
• 2400 MHz to 2483.5 MHz: Below 20 dBm for 02.11b,g,n, axe
• 5150MHz to 5250 MHz: Below 23 dBm for 802.11a,n,ac, ax
• 5350MHz to 5725 MHz: Below 20 dBm for 802.11a,n,ac,ax
• 5725MHz to 5875 MHz: Below 14 dBm for 802.11a,n,ac, ax

Restricted countries:

• Manufacturer Name: SAMSUNG ELECTRONICS CO. LTD.
• Address: 129 Samsung-ro, Yeongtong-gu, Suwon-Si Gyeonggi-do 16677 Korea (Republic Of)

Contact info for above certified FCC:

• Company Name: Samsung Electronics America, Inc. Contact Name: JENNI CHUN
• Address: 19 Chapin Rd, Building D. Pine Brook, NJ 07058 Telephone No: 973-808-6375
• Email: j1.chun@samsung.com

Documents / Resources

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