MEDIATEK MT7921K Wireless Module User Guide
- June 5, 2024
- Mediatek
Table of Contents
MEDIATEK MT7921K Wireless Module User Guide
© 2021 MediaTek Inc. This document contains information that is proprietary to MediaTek Inc. Unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited. Specifications are subject to change without notice.
Document Revision History
1 System overview
1.1 General Description
MT7921K chip is highly integrated single chip which have built in 2×2 dual- band wireless LAN and Bluetooth combo radio. WiFi works on the ISM band, which means many other devices such as microwave oven, radar, and Bluetooth use the same frequencies and channels with WiFi devices. Therefore, governments make regulations to avoid interference between devices. The specifications include usable channels, scan rule, and transmit power.
2 Driver install
2.1 How to install driver
Please follow the procedure listed in below to install driver
- 1st : Update Windows security package to register signature mechanism
- 2nd : Install Windows driver.
2.1.1 Windows Security for new signature mechanism
If you are the 1st time to use this driver, you should update Windows Security
for new signature mechanism at first. Please follow below link to install this
software. https://www.microsoft.com/en-us/download/details.aspx?id=46148
For windows 7 x64 example:
2.1.2 Windows 10 install note
If manufacturer can’t install the driver in Windows 10 due to driver integrity check, try to disable the integrity check to allow installation.
- Disable Driver Integrity Check
- Open cmd as Administrator.
- Execute `bcdedit /set nointegritychecks on’
- Reboot
- Then install again. If still fail, try do
Disable Secure Boot’ below. NOTE: Re-enable the driver integrity check by executingbcdedit /set nointegritychecks off’ and then rebooting.
- Disable Secure Boot Please refer to: https://docs.microsoft.com/en-us/windows-hardware/manufacture/desktop/disabling-secure-boot
2.1.3 Install Windows driver
MT7921K supports PCIE interface. According to interface type of MT7921K, please refer to steps shown below to install Windows driver:
PCIE interface:
-
Connect DUT to PC/NB and check Windows Device Manager.
-
Window Device Manager would discover DUT shows “Generic Bluetooth Adapter”(BT device) and
-
Right click the “Generic Bluetooth Adapter” BT device and select disable as follows.
-
Right-click on “WiFi_If” Wifi device and Update Driver Software.
-
According host’s Windows’ OS to select and install driver.
3 General Information & Integration Instructions
3.1 General Description of MT7921K
3.2 Antenna information
The antennas mentioned below are covered in the certification scope and the HOST can only be used with the following antennas:
Please note that the above antennas are custom made for MediaTek MT7921K module and are not listed in Walsin Technology Corp standard catalogs. For the purchase of these antennas, please contact Walsin Technology as listed below directly. Only the above antennas are tested for compliance with the FCC rules, and all other antennas (even same type with lower gain) will require a re-assessment to be used with this module.
Contact info for above certified antennas:
Company/Dept.: Walsin Technology Corp./ Antenna Business Dept. Contact window:
Andrew Lin
Tel: +886-3-475-8711 # 8172
Cell phone: +886-938-286-596
Email address:
[email protected]
URL link: http://www.passivecomponent.com/zh-ant/products/antenna/
3.3 Host Integration instructions
The product is designed to be used with “NGFF (Next Generation Form Factor) M.2 2230” PCIE Bus, please install module into a M.2 2230 PCIE slot.
3.4 Host product testing guidance
HOST must follow the specific restrictions listed in “3.5 Regulatory notes” section below and section 3 of KDB996369 D04 V02 Module Integration Guide v01, to verify that the host product meets all the applicable rules.
3.5 Regulatory notes
Federal Communication Commission Interference Statement
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.
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.
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.
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.
Radiation Exposure Statement:
The product comply with the FCC portable RF exposure limit set forth for an uncontrolled environment and are safe for intended operation as described in this manual. The further RF exposure reduction can be achieved if the product can be kept as far as possible from the user body or set the device to lower output power if such function is available.
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: 2.2 List of applicable FCC rules This module has been tested for compliance to FCC Part 15 Subpart C (15.247) and Subpart E (15.407). Device is tested for compliance as a low power indoor client device within 5.9257.125 GHz band.
2.3 Summarize the specific operational use conditions The module is tested for
standalone mobile RF exposure use condition. Any other usage conditions such
as co-location with other transmitter(s) will need a separate reassessment
through a class II permissive change application or new certification. This
module is authorized for Low Power Indoor Client applications only; final host
product must be for indoor operations only.
Further operation restrictions on the host product include: *Prohibited for
control of or Communications with unmanned aircraft systems.
2.4 Limited module procedures Not applicable.
2.5 Trace antenna designs Not applicable.
2.6 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.
2.7 Antennas
The following antennas have been certified for use with this module; antennas
of the same type with equal or lower gain may also be used with this module
except for operations within the 5.925~7.125GHz band. Use of any other antenna
with a lower or higher gain in this band will require a separate reassessment
through a Class II Permissive Change application or new certification.
2.8 Label and compliance information
The final end product must be labeled in a visible area with the following:
“Contains FCC ID: RAS-MT7921K”. The grantee’s FCC ID can be used only when all
FCC compliance requirements are met.
2.9 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 transmitter(s) class II
permissive change re-evaluation or new certification.
2.10 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 to this portion of rule requirements if applicable.
As long as all 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.
IMPORTANT NOTE: In the event that these conditions can not 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 can not 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.
Manual Information To the End User
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.
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.
MediaTek Confidential © 2021 MediaTek Inc.
This document contains information that is proprietary to MediaTek Inc. Unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited.
References
- Disabling Secure Boot | Microsoft Learn
- Download Security Update for Windows 7 for x64-based Systems (KB3033929) from Official Microsoft Download Center