User Manual

FCC ID: 2AOO6-WLT8761M

Users Manual

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FCCID_4508184

              Wi-linktech Communication Technologies (Shanghai) Co.,Ltd




   WLT8761M dual mode            Bluetooth module

                               RTL 8761 BR/EDR/LE

                                MVsilicon BM5064




                         Spec

                         V1.1




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                                                               Index
1 Summary.......................................................................................................................................... 3
     1.1 Functions............................................................................................................................... 3
     1.2 Application Field....................................................................................................................3
2 Electrical characters......................................................................................................................... 4
     2.1 Basic characters.....................................................................................................................4
     2.2 Power consumption.............................................................................................................. 4
     2.3 Audio performance............................................................................................................... 5
3 Hardware Description...................................................................................................................... 5
       3.1 Module size and Pin assignment.......................................................................................... 6
4 PCB Design and RF Layout...............................................................................................................7
4.1 Example Board Layout..................................................................................................................7
     4.2 PCB Layout Guide.................................................................................................................7
5 Recommended Reflow Profile(Number of Times : ≤2 times).......................................................8
6. Storage...........................................................................................................................................9
7 Software introduction.................................................................................................................... 10




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1 Summary

WLT8761M is a dual mode Bluetooth module, support for all Bluetooth profiles and BLE profiles.

WLT8761M is based on RTL 8761. It is a Bluetooth BR/EDR/BLE single chip solution. RTL8761 has
best-in-class RF performance (TX power, RX sensitivity, blocking) and advanced power
management for very low-power applications.

WLT8761M has a high efficiency audio SOC inside. It is BM5064 from MVSilicon which integrates
ARM Cortex-M3 MCU, Bluetooth stack, MP3/WMA decoder, MP2 encoder, OTG, SD/MMC card
controller, Audio DAC, Audio ADC, RTC in a single chip.


    1.1 Functions
    Bluetooth BR/EDR/LE
    Support all Bluetooth profiles, such as SPP, SPPLE, HFP, MAP, PXP, A2DP, ANP, HID, AVRCP…
    Embedded ARM Cortex-M3, running @ 96MHz
    Built-in 128K byte SRAM
    Support booting from SPI-flash and the firmware can be updated through SD or USB disk
    Built-in MP2/MP3/WMA/FLAC(8/16/24bit)/WAV(IMA-ADPCM and raw PCM) decoder and
MP2 encoder
    Embedded 20-bit Audio DAC and 16-bit Audio ADC
    Built-in Capless Earphone driver
    Built-in MIC amplify block with AGC
    Support audio input
    Onboard 2.4GHz antenna,support external antenna optional
    Support AT+Command Set for Configuration
    Single power supply: 3.35V~5V
    Smallest size: 18x35mm
    Flexible Software Platform, customized software service

    1.2 Application Field
    Bluetooth Speaker
    True wireless stereo Audio system
    Bluetooth handsfree
    Fitness
    Wireless POS
    Portable printer




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2 Electrical characters

2.1 Basic characters

Absolute Maximum Ratings                                    Min             Max               Unit
Power supply Voltage (LDOIN)                                –0.5            +5.5               V
Voltage of I/O pins                                         –0.5            +3.6               V
Storage Temperature                                         –55             +125               °C
                                Table 1. Absolute Maximum Ratings



Recommended Operating Conditions                            Min           TYP         Max      Unit
Power supply Voltage (LDOIN)                                3.35          4.2          5.0          V
Voltage of I/O pins                                           0           3.3          3.6          V
Operating Temperature                                        -20          25           75          °C
                              Table 2. Recommend Working Condition


Wireless Standard       Bluetooth BR/EDR/LE
Frequency               2.402GHz~2.480GHz
TX power                10dBm
Antenna                 external:RF_PIN
                        internal:PCB antenna                  High gain as external antenna
                                        Table 3. Bluetooth features



I/O pins                            Test Conditions                Min          Max           Unit
Logic input low, VIL                                                  0         0.75            V
Logic input high, VIH                                              2.1          3.6             V
Logic output low, VOL                         6mA                     0         0.6             V
Logic output high, VOH                        6mA                  2.7          3.3             V
                                Table 4. DC Characteristics of I/O pins

2.2 Power consumption

                      Characteristics                             Min     Typ         Max      Unit
       Current consumption in shut-down mode                                                    uA
          Current consumption in active mode                                                   mA
                                Table 5. Static Current Consumption




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2.3 Audio performance
      Parameter          Test conditions         Min         Type        Max   Unit
                            No filter                     88(L)/88(R)           dB
 Signal-to-Noise Ratio
                          20KHz filter                    92(L)/92(R)           dB
       THD+N                  Peak                        -72(L)/-72(R          dB
                                                                )
   Stereo Isolation      IPad as Player                       80                dB
                             Table 6. Audio performance




3 Hardware Description

3.1 Module size and Pin assignment




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             Figure 2. WLT8761M module size




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4 PCB Design and RF Layout

      4.1 Example Board Layout




                                Figure 4. Footprint dimensions

    4.2 PCB Layout Guide
Bluetooth works in a frequency of 2.4GHz, the design of PCB and Mechanical should be careful to
avoid the impact of various factors on the RF performance. Please note the following:
1. Outer casing surrounding WLT8761M module should avoid using metal materials. If the
     casing is metal, it is recommended to use an external 2.4GHz antenna.
2. Metal screws should be far away from RF part of module.
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3.   Module should be placed on the edge of motherboard, ensure the antenna towards outside.
     Please make sure that all layers have no trace or copper under the Antenna region.




5 Recommended Reflow Profile(Number of Times : ≤2 times)

     Parameter setting of reflow soldering can refer to the following requirements
:




                                    Figure 5. Reflow profile



      Temperature range                          Time              Key parameters
      Preheat zone(<150℃)                        60-120S           Ramp up rate:≤2S
      Uniform temperature zone(150-200℃)         60-120S           Ramp up rate:<1S
      Recirculation zone(>217℃)                  40-60S            Peak:240-250℃
      Cooling zone                               Ramp down rate:1℃/s≤Slope≤4℃/s
                               Table 8. Reflow process parameter




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6. Storage

         1. Calculated shelf life in sealed bag: 12 months at <40℃ and <90% relative
            humidity(RH).
         2. After bag is opened , devices that will be subjected to reflow solder or other high
            temperature process must be:
            1). Check the humidity card :Normal at ≦ 30%RH. If :30%~40%(pink) or
            greater than 40%(red),labeling module has moisture absorption. Module require
            bake before mounting.
            2). Mounted within 168 hours of factory conditions <30℃/60%RH.OR
            3). Module apart packing after 168 hours,need to bake before SMT, to remove
            the module hygroscopic.
         3. If baking is required ,devices may be baked for 8 hours at 125℃. After baking,
            put proper amount of desiccant to seal packages.
         4. Module vacuum packing 600PCS per bag.


Note: Product handling, storage, processing process must follow the J-STD-033 IPC/JEDEC




7 Software introduction

WLT8761M is a bluetooth dual mode module with embedded Bluetopia™ protocol stack, support
for all Bluetooth profiles and BLE profiles. Such as SPP, SPPLE, HFP, MAP, PXP, A2DP, ANP, HID,
AVRCP…

UART interface is used for data transmission and log information printing. Host MCU can use
AT+Command set to control WLT8761M module through UART interface. For detail commands
please refer to WLT8761M module SW application documents.




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Regulatory Module Integration Instructions

List of applicable FCC rules
This device complies with part 15.247 of the FCC Rules.
Summarize the specific operational use conditions
This module can be applied in wireless POS, sports and fitness sensors , health sensors, mobile
accessories as well as smart home. The input voltage to the module should be nominally 3.35-5.0
V DC ,typical value 4.2V DC and the ambient temperature of the module should not exceed
75℃.

This module using PCB antennas with maximum gain is 2.5 dBi .Other antenna arrangement is
not covered by this certification.
If the antenna needs to be changed,the certification should be re-applied.

Limited module procedures

Not applicable

Trace antenna designs

Not applicable

RF exposure considerations

This equipment complies with FCC radiation exposure limits set forth for an
uncontrolled environment .This equipment should be installed and operated with
minimum distance 5mm between the radiator& your body. If the device built into a host as
a portable usage, the additional RF exposure evaluation may be required as specified by
2.1093.

Antennas
This module using PCB antennas with maximum gain is 2.5 dBi .
Label and compliance information
The outside of final products that contains this module device must display a label referring to
the enclosed module. This exterior label can use wording such as:"Contains Transmitter
Module FCC ID: 2AOO6-WLT8761M " ,or "Contains FCC ID: 2AOO6-WLT8761M ",Any similar
wording that expresses the same meaning may be used.
Information on test modes and additional testing requirements
a) The modular transmitter has been fully tested by the module grantee on the required
number of channels, modulation types, and modes, it should not be necessary for the host
installer to re-test all the available transmitter modes or settings. It is recommended that the
host product manufacturer, installing the modular transmitter, perform some investigative
measurements to confirm that the resulting composite system does not exceed the spurious
emissions limits or band edge limits (e.g.,where a different antenna may be causing additional
emissions).
b) The testing should check for emissions that may occur due to the intermixing of emissions


with the other transmitters, digital circuitry, or due to physical properties of the host product
(enclosure). This investigation is especially important when integrating multiple modular
transmitters where the certification is based on testing each of them in a stand-alone
configuration. It is important to note that host product manufacturers should not assume that
because the modular transmitter is certified that they do not have any responsibility for final
product compliance.
c) If the investigation indicates a compliance concern the host product manufacturer is
obligated to mitigate the issue. Host products using a modular transmitter are subject to
all the applicable individual technical rules as well as to the general conditions of
operation in Sections 15.5, 15.15, and 15.29 to not cause interference. The operator
of the host product will be obligated to stop operating the device until the interference
has been corrected


The WLT8761M module is based on RTL8761BTV chip . For the testing module on
your product, user can refer to specification of the Bluetooth system on how to
configure and evaluate the module. This specification can also be found on the
official Bluetooth website:

https://www.bluetooth.org/en‐us/specification/adopted‐specifications.
Additional testing, Part 15 subpart B disclaimer

The final host / module combination need to be evaluated against the FCC Part 15B
criteria for unintentional radiators in order to be properly authorized for operation as a
Part 15 digital device .


The host integrator installing this module into their product must ensure that the final
composite product complies with the FCC requirements by a technical assessment or
evaluation to the FCC rules, including the transmitter operation and should refer to
guidance in KDB 996369.

Frequency spectrum to be investigated
For host products with certified modular transmitter , the frequency range of
investigation of the composite system is specified by rule in Sections 15.33(a)(1)
through (a)(3), or the range applicable to the digital device, as shown in Section
15.33(b)(1), whichever is the higher frequency range of investigation.

Operating the host product
When testing the host product, all the transmitters must be operating. The transmitters
can be enabled by using publicly-available drivers and turned on,so the transmitters
are active. In certain conditions it might be appropriate to use a technology-specific call
box (test set) where accessory devices or drivers are not available.

When testing for emissions from the unintentional radiator, the transmitter shall be
placed in the receive mode or idle mode, if possible. If receive mode only is not
possible then, the radio shall be passive (preferred) and/or active scanning. In these


cases , this would need to enable activity on the communication BUS (i.e., PCIe,
SDIO , USB) to ensure the unintentional radiator circuitry is enabled. Testing
laboratories may need to add attenuation or filters depending on the signal strength of
any active beacons (if applicable) from the enabled radio(s). See ANSI C63.4, ANSI
C63.10 and ANSI C63.26 for further general testing details.



The product under test is placed into a normal ‘paired' mode with another BLE device,
as per the normal intended use of the product (for example, transferring data).



FCC Statement:
Any Changes or modifications not expressly approved by the party responsible for compliance
could void the user’s authority to operate the equipment.

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.



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



Document Created: 2019-11-08 07:02:39
Document Modified: 2019-11-08 07:02:39

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