USR WH-MT7628AN Wireless Module User Manual
- August 6, 2024
- USR
Table of Contents
USR WH-MT7628AN Wireless Module
FAQ
Frequently Asked Questions
- Q: What are the wireless standards supported by the WH-MT7688/7628AN-V2.4 module?
- A: The module supports wireless standards 802.11 b/g/n.
- Q: What is the operating voltage of the module?
- A: The operating voltage is 3.3V+/-0.2V.
- Q: What is the operating temperature range of the module?
- A: The module can operate within a temperature range of -20°C to +55°C.
About documentation
Purpose of the Documentation
This paper elaborates the basic functions and main features, hardware interface and usage methods, structural characteristics and other electrical indicators of the 628AN-V2.4 wireless module. By reading this document, users can have an overall understanding of the product, have a clear understanding of the product specifications, and smoothly embed the module into various terminal designs.
Product Appearance
Product Introduction
Basic parameters
Table 1 List of parameters
| classify | parameter | Valid values |
|---|
Wireless parameters
| Wireless standards| 802.11 b/g/n
Transmit power
| 802.11b: +20dBm(Max.@11Mbps，CCK)
802.11g: +17dBm(Max.@54Mbps，OFDM)
802.11n: +17dBm(Max.@HT20，MCS7)
802.11n: +16dBm(Max.@HT40，MCS7)
Receive sensitivity
| 802.11b: -88 dBm(typ.@11Mbps，CCK)
802.11g: -75 dBm(typ.@54Mbps，OFDM)
802.11n: -73 dBm(typ.@HT20，MCS7)
802.11n: -70 dBm(typ.@HT40，MCS7)
Antenna options| Choose between an IPEX socket and an external pad
Hardware parameters
| ****
Interface standards
| Ethernet：1~5 个 10M/100M Adaptive USB2.0：1 way
SDIO：1way SPI：1 way I2C：1 way I2S：1 way UART：3way PWM：4way
GPIO：8 channels and above
Operating voltage| 3.3V+/-0.2V
Operating current| No-load operating current: average 170 ±
50mA
Electrical requirements| 800mA above
flash| 128Mb
Running memory| DDR2: 1Gb
Operating temperature| -20℃ ~ +55℃
Storage temperature| -20℃ ~ +80℃
Operating humidity| 10~90%RH(No condensation)
Store humidity| 10~90%RH(No condensation)
size| size：33.02mm x 17.78mm x 3.5mm
encapsulation| SMT
Module application block diagram
Module interfaces include: power input, IO, serial port, RF interface
Pin definition
Table 2 LCC Package pin definition
| pins | name | Signal type | illustrate |
|---|---|---|---|
| A1 | I2S_SDI | I | I2S Data Entry；GPIO0 |
| A2 | I2S_SDO | O | I2S Data output ， Related to chip start-up, the external |
cannot be pulled up and down, and the drive source cannot be connected；GPIO1
A7| VDD_FLAS
H
| P| FLASH Independent power supply，3.3V
---|---|---|---
B23| GND| P| GND
B24| UD_P| IO| USB D+
B25| UD_N| IO| USB D-
C1| GND| P| GND
C2| RF| IO| RF input and output
C3| GND| P| GND
C4| GND| P| GND
C17| 3.3VD| P| POWER
C18| GND| P| GND
C19| GPIO40/LIN
K3
| IO| GPIO40/PORT3 LED
C20| GPIO39/LIN
K4
| IO| GPIO39/PORT4 LED
C21| CPURST_N| I| CPU reset input
C22| WPS_RST_P
BC
| I| GPIO38
C25| GND| P| GND
Hardware reference designs
Peripheral circuit frame reference
Power interface
The input voltage of the power supply is 3.1~3.5V, the standard value is 3.3V, and the no-load operating current: the average is 170±50mA, and the power supply current must be greater than 800mA. The pin interface reserves a high- frequency filter capacitor, and 10uF + 0.1μF + 1nF + 100pf is recommended. If the application environment is harsh, often subject to ESD interference or high EMC requirements, it is recommended to connect magnetic beads in series or TVS transistors in parallel to increase the stability of the module.
When designing products, users should first ensure that the peripheral circuit can provide sufficient power supply capacity, and the power supply range should be strictly controlled within 3.3V+/-0.2 V, and the peak value of power supply voltage should be within 300mV. In addition, a large capacitor is placed after DC/DC or LDO to prevent voltage dips in the external power supply during the pulse current period.
Table 3 Module power consumption
Node name| Pin description| MIN| Average| MAX|
unit
---|---|---|---|---|---
VCC| Module supply voltage| 3.1| 3.3| 3.5| V
I| The module runs at no load| –| –| 220| mA
UART interface
The TX port of serial port 0 (module pin B1) and the TX port of serial port 1 (module pin C6) are related to chip startup, and cannot be pulled up or down externally, and cannot be connected to the drive source.
If the serial port of the module communicates directly with the MCU (3.3V level), you only need to add the TXD of the module to the RXD of the MCU, and connect the RXD of the module to the TXD of the MCU. When the level of the module does not match the level of the MCU, a special level translation chip needs to be added in the middle.
Electrical Characteristics
Operating storage temperature
The operating storage temperature is shown in the figure below
Table 4 Temperature parameters
| Parameter | Min | Max |
|---|---|---|
| Operating temperature | -20℃ | +55℃ |
| Storage temperature | -20℃ | +80℃ |
Input power
Table 5 Power supply range
| Parameter | Min. | Typ. | Max. |
|---|---|---|---|
| Input Voltage（V） | 3.1 | 3.3 | 3.5 |
Module IO port level
Table 6 I/O pin voltage parameters
| Symbol | Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| VIH | High-level input |
voltage
| 2.0| –| VCC+0.
3V
| V
VIL| Low-level input
voltage
| -0.3| –| 0.8| V
VOH| High-level output
voltage
| 2.4| –| –| V
VOL| Low-level output
voltage
| –| –| 0.4| V
| | | | |
VCC supplies the voltage to the module.
IO drive current
| IO pins | Maximum drive current | Maximum input current |
|---|---|---|
| All I/O ports | 2mA | 2mA |
Mechanical properties
Reflow soldering is recommended
Size description
FCC STATEMENT
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:
- this device may not cause harmful interference
- 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.
Caution: Any changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate this equipment.
ORIGINAL EQUIPMENT MANUFACTURER (OEM) NOTES
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:
WH-MT7628AN. 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 FCCapplication 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.
Jinan USR IOT Technology Limited
FCC ID: 2ACZO-WH-MT7628AN
Model Name: WH-MT7628AN
References
Read User Manual Online (PDF format)
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