User Manual of CWBR720M
1. Introduction
CWBR720M is a Wi-Fi module compliant with IEEE802.11 a.b.g.n.ac MAC/baseband/radio applications. The core chipset is from Mediatek, part number MT7668.
2. Hardware Architecture
2.1 Main Chipset Information
| Item | Vendor | Part Number |
|---|---|---|
| IEEE802.11 a.b.g.n.ac mac/baseband/radio | Mediatek | MT7668 |
2.2 Absolute Maximum Ratings
| Symbol | Parameter | Rating | Unit |
|---|---|---|---|
| Temp | Operating | -10 to 70 | °C |
| TSTG | Storage Temperature | -45 to 85 | °C |
3. Operational Description
CWBR720M is the 802.11a/b/g/n/ac WIFI Module that acts as a communication controller for users of a wireless device to connect to SMART DEVICE.
Features
- IEEE 802.11 a/b/g/n/ac
- Dual-band 2T2R Mode(2.4GHz/5GHz)
- 2X2 MIMO, 600MHz
- Support 20MHz, 40MHz, 80MHz bandwidth in 2.4GHz band and 5GHz band
- Security support for WFA WPA/WPA2 personal, WPS2.0, WAPIP
- QoS support of WFA WMM, WMM PST
- Integrated LNA, PA, and T/R switch
- Optional external LNA and PA support.
Time base of the RF frequency
For IF and RF frequency, a crystal(40MHz) is a clock reference.
Synthesizer
Synthesizer inside Transceiver. Internal voltage controlled oscillator (VCO) provides the desired LO signal base on the phase-locked loop (PLL) with a relatively wide tuning range for this application. Internal fractional nPLL allows support for a wide range of reference clock frequencies.
WIFI Transmission
Baseband data is modulated and upconverted to the 2.4GHz ISM band, respectively. Base-band Processing (BBP) IC has DSSS and OFDM modulation function, it provides transmission data rate are 1, 2, 5.5, 11Mbps on DSSS and 6, 12, 18, 24, 36, 48, 54 Mbps on OFDM. Digital data signal will be converted to analog (TX IQ) signals through DAC in BBP IC, TX IQ pass through to low pass filter. TX I/Q signal use direct conversion (zero-IF) architecture converter to generate carrier frequency signal. Transceiver IC and internal PA magnify output power.
WIFI Receiver
Reverse direction isolation of LNA inside Transceiver IC suppresses unwanted radiation. Then RF signal will be directly down to IF signal (RX IQ) and high frequency spurious emissions are suppressed by LPF. At last RX IQ signal will be demodulated digital data.
Antenna
Integral metal antenna is used. Detail antenna gains are listed in the FCC/ISED test reports.
Product Details
Data Modulation
- DSSS: CCK, BPSK, QPSK for 802.11b
- OFDM: BPSK, QPSK, 16QAM, 64QAM, 256QAM for 802.11a, g, n, ac
Frequency
- 2400-2483.5 MHz
- 5150-5350MHz, 5470-5725MHz, 5725-5850MHz
This module ensures frequency stability such that an emission is maintained within the band of operation under all conditions of normal operation.
4. Notice FCC/IC Statement
Approval Statement
FCC approval
This device complies with Part 15 of the FCC's Rules. Operation is subject to the following two Conditions:
- This device may not cause harmful interference, and
- This device must accept any interference received, including interference that may cause undesirable operation.
To satisfy FCC exterior labeling requirements, the following text must be placed on the exterior of the end product.
The host device must be labeled to display FCC ID of the module, for example: Contains Transmitter module FCC ID: A3LCWBR720M
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:
- 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.
- The OEM integrator is responsible for ensuring the end-user has no manual instruction to remove or install module.
- The module is limited to installation in mobile or fixed applications.
IC approval
This device complies with Industry Canada license-exempt RSS standard(s). Operation is subject to the following two conditions:
- this device may not cause interference, and
- this device must accept any interference, including interference that may cause undesired operation of the device.
The host device must be labeled to display the Industry Canada certification number of the module. Contains transmitter module IC:649E-CWBR720M
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.
FCC/IC RF Exposure Statements
This device complies with FCC & IC radiation exposure limits set forth for an uncontrolled environment. This module may not be co-located with any other transmitters or antennas. The antenna must be installed such that 20cm is maintained between the antenna and users.
User Information
Caution: Any changed or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate this equipment.
Important Note for OEM Integrator
This is a single module which has been tested and complied with Part 5.247/15.407, and RSS-247 requirements.
Host device needs to be labeled with module's FCC/IC IDs, for example, "Contains Transmitter module FCC ID: A3LCWBR720M , IC:649E-CWBR720M ".
This device is intended only for OEM integrators under the following conditions:
- This module may not be co-located with any other transmitters or antennas.
- The antenna must be installed such that 20cm is maintained between the antenna and users.
- Only the antenna type and antenna gain documented in the module FCC/IC reports can be used.
- For Canada, this device is limited to indoor use when operating in 5150-5250 MHz to reduce the potential for harmful interference to co-channel mobile satellite systems.
As long as above conditions are met, further test or certification will not be required. However, the OEM integrator is still responsible for host product evaluation or any additional compliance requirements with this module installed. In the event that 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.
Additional testing, Part 15B disclaimer
This module only complied with FCC 15.247/15.407 requirements as listed on the grant, and therefore, the host product manufacturer is responsible for FCC Part 15B compliance testing with the module installed.
