A31 Wireless Audio Module User Manual 15_A31 UserMan Wiimu Information Technology Inc.

Wiimu Information Technology Inc. Wireless Audio Module

Page 1 of A31 Wireless Audio Module User Manual 15_A31  UserMan Wiimu Information Technology Inc.
Page 2 of A31 Wireless Audio Module User Manual 15_A31  UserMan Wiimu Information Technology Inc.
Page 3 of A31 Wireless Audio Module User Manual 15_A31  UserMan Wiimu Information Technology Inc.
Page 4 of A31 Wireless Audio Module User Manual 15_A31  UserMan Wiimu Information Technology Inc.
Page 5 of A31 Wireless Audio Module User Manual 15_A31  UserMan Wiimu Information Technology Inc.
Page 6 of A31 Wireless Audio Module User Manual 15_A31  UserMan Wiimu Information Technology Inc.
Page 7 of A31 Wireless Audio Module User Manual 15_A31  UserMan Wiimu Information Technology Inc.
Page 8 of A31 Wireless Audio Module User Manual 15_A31  UserMan Wiimu Information Technology Inc.
Page 9 of A31 Wireless Audio Module User Manual 15_A31  UserMan Wiimu Information Technology Inc.
Page 10 of A31 Wireless Audio Module User Manual 15_A31  UserMan Wiimu Information Technology Inc.
Page 11 of A31 Wireless Audio Module User Manual 15_A31  UserMan Wiimu Information Technology Inc.
Page 12 of A31 Wireless Audio Module User Manual 15_A31  UserMan Wiimu Information Technology Inc.
Page 13 of A31 Wireless Audio Module User Manual 15_A31  UserMan Wiimu Information Technology Inc.
Page 14 of A31 Wireless Audio Module User Manual 15_A31  UserMan Wiimu Information Technology Inc.
Page 15 of A31 Wireless Audio Module User Manual 15_A31  UserMan Wiimu Information Technology Inc.
Page 16 of A31 Wireless Audio Module User Manual 15_A31  UserMan Wiimu Information Technology Inc.
Page 17 of A31 Wireless Audio Module User Manual 15_A31  UserMan Wiimu Information Technology Inc.
Page 18 of A31 Wireless Audio Module User Manual 15_A31  UserMan Wiimu Information Technology Inc.
Page 19 of A31 Wireless Audio Module User Manual 15_A31  UserMan Wiimu Information Technology Inc.
Page 20 of A31 Wireless Audio Module User Manual 15_A31  UserMan Wiimu Information Technology Inc.
Page 21 of A31 Wireless Audio Module User Manual 15_A31  UserMan Wiimu Information Technology Inc.
Page 22 of A31 Wireless Audio Module User Manual 15_A31  UserMan Wiimu Information Technology Inc.

LinkPlay Wireless Smart Audio
Module (A31)
User Manual
Rev 1.0
SEP. 21, 2015

Doc Title
Number
Version
Wireless smart audio module
WMB20150921
1.0
HISTORY
Version
0.1
Date
09/21/2015
Description
Author
Initial document
Document No.: WMB20150921
Page 2 of 20

Doc Title
Wireless smart audio module
Number
Version
WMB20150921
1.0
INDEX
Features ....................................................................................................................................................................... 4
1. Overview ............................................................................................................................................................. 5
1.1.
2.
3.
Parameters................................................................................................................................................ 5
Hardware Description ............................................................................................................................... 6
2.1. Description of hardware interface............................................................................................................ 6
2.2. Mechanical dimension ............................................................................................................................. 8
2.3. Connect with Audio Codec ...................................................................................................................... 9
2.4. External antenna .................................................................................................................................... 11
2.5. 10/100M Ethernet Port .......................................................................................................................... 11
2.5.1.
Connect the module with RJ45 .......................................................................................................... 12
2.6. USB host port ........................................................................................................................................ 12
2.7. Power supply ......................................................................................................................................... 13
2.8. Silkscreen and Package............................................................................................................................... 13
Software .................................................................................................................................................... 14
3.1. Airplay introduction............................................................................................................................... 15
3.2. DLNA introduction ................................................................................................................................ 15
3.3. WiFi mode ............................................................................................................................................. 15
3.3.1.
AP Client mode ........................................................................................................................ 16
3.4. Web Server setup ................................................................................................................................... 16
3.4.1. Web server login ..................................................................................................................... 17
3.4.2.
Connecting the module to another AP ................................................................................. 17
3.4.3.
Advanced setting for the module .......................................................................................... 18
3.4.3.1. Module setting page .............................................................................................................. 18
3.4.3.1.1. Software upgrade ............................................................................................................... 18
3.5. Use UART to debug ............................................................................................................................... 19
3.6. WPS Setting ........................................................................................................................................... 20
3.7. Restore to factory setting ....................................................................................................................... 20
Document No.: WMB20150921
Page 3 of 20

Doc Title
Wireless smart audio module
Number
Version
WMB20150921
1.0
Features


















Support 2.4GHz 802.11 b/g/n with highly optimized Wi-Fi performance
Support 10/100Mbps Ethernet
Support Internet audio streaming via Apple AirPlay or DLNA
Support Spotify, Pandora, iHeartRadio, Tidal, Tune in and many more ...
Support TCP/IP/UDP/HTTP/UPNP protocol
Support play-list with M3U, M3U8, WPL, ASX, PLS formats
Support MP3/WMA/AAC/AAC+/ALAC/FLAC/APE/WAV etc. audio formats
Support STA/AP/AP Client mode
Support Ethernet, UART and USB2.0 interfaces
Support digital audio input and output via I2S interface
Built-in web server to easily configure the module
Support remote control of module via WLAN
Support online firmware upgrade
Support module configuration via iOS or Android APP
Support Wi-Fi UART pass-through or self-defined MCU/UART interface
Support multi-room audio (a.k.a, party mode) and multi-channel audio with perfect time synchronization
among speakers
Support most popular streaming services around the world
Provide iOS, Android and PC SDK and applications to work with the module
Applications







Wi-Fi speaker
Smart toy
Smart audio receiver
Wi-Fi audio docking station for smartphones
Internet smart audio device
Internet radio receiver
Home automation and Internet of Thing (IoT)
Document No.: WMB20150921
Page 4 of 20

Doc Title
Number
Version
Wireless smart audio module
WMB20150921
1.0
1.Overview
LinkPlay Wi-Fi Audio module A31-2, is our second generation smart audio modules developed to be used in
wireless speaker, wireless docking station, Wi-Fi base station, home automation and smart toy. It supports
802.11b/g/n standard with up to 300Mbps bandwidth. It could work at AP, AP client or station modes. It is fully
compatible with Apple AirPlay and digital living network alliance (DLNA) streaming standards. It supports Hi-Fi
audio up to 192KHz, 24-bit with most popular audio formats. It supports multi-room and multi-channel audio
streaming with perfect synchronization.
With this module, you can play the music on your speaker wirelessly from iPhone, iPad , iPod touch, Android
devices or PC. More important, it enables the traditional speaker system to become the Internet enabled device
through the wired or wireless connection provided by the module. Thus, you could freely playback any Internet
audio contents such as music, podcast, radio or either the accompany audio in the movie directly from the Internet.
1.1. Parameters
Items
Performance
Certification
FCC/CE/Reach/RoHS
Standard
802.11 b/g/n 1T1R
Frequency
2.412GHz-2.484GHz
802.11b: +17dBm(Max.)
Transmit
Wireless
802.11g: +15dBm(Max.)
802.11n: +14dBm(Max.)
802.11b: -76dBm
Receive sensitivity
802.11g: -67dBm
802.11n(HT20): < -82dBm(MCS0)
802.11n(HT20): < -64dBm(MCS7)
Hardware
Antenna options
External:I-PEX
Work voltage
3.5V ~ 5.5V
Work current
130 mA ~ 320 mA
Peak current
320 mA
Standby current
20 mA
Work temperature
-5℃ - 40℃
Storage temperature
-40℃ - 135℃
Status LED
AP status, client status, power, WiFi data transfer
I2S input/output
24 bit, up to 192KHz
Wi-Fi distance
80m
IO extension
Ethernet, USB, UART, GPIO, I2C
Size
28.5mm X 38.7mm X 3mm, 36-pin DIP
Document No.: WMB20150921
Page 5 of 20

Doc Title
Number
Version
Wireless smart audio module
Software
WMB20150921
1.0
Wi-Fi working mode
AP Client (by default)/AP/STA
Security
WEP/WPA-PSK/WPA2-PSK/WAPI
Encryption
WEP64/WEP128/TKIP/AES
User Configuration
Web browser, Companion APP
Software update
Web browser or APP
Online update
Support
Audio source
U disk, Smartphone/Tablet/PC, online contents
Applications support
iOS, Android, Win7/8
Audio
protocol
AirPlay
streaming
DLNA, Spotify Connect, QQ music Qplay
Multi-room audio
Support Airplay, Spotify Connect, DLNA, U Disk attached to
WiFi device, BT and Aux-in multi-room transmission
Table1-1 LinkPlay A31-2 module parameters
2. Hardware Description
2.1. Description of hardware interface
A31-2 module provides the option to connect with customer board through its 36-pins DIP . The detail is as
follows.
Document No.: WMB20150921
Page 6 of 20

Doc Title
WMB20150921
Number
Version
Wireless smart audio module
1.0
Figure 2-1 A31-2 interface pins
Pin description:
Pin
3,4,21
Description
Net
Type
Comments
GND
GND
Power
Ground
1,2
5VD input
DC+5V
Power, I
+5V@ 350mA
20
3.3VD output
DC+3.3V
Power, O
Output +3.3V@100mA
I2S_WS
I2S_WS
All pins could be pin shared as
I2S_CLK
I2S_CLK
I/O
GPIO
I2S_SDO
I2S_SDO
I2S_SDI
I2S_SDI
ETH_TXP
ETH_TXP
10M/100M
10
ETH_TXN
ETH_TXN
(Current driven)
11
ETH_RXP
ETH_RXP
12
ETH_RXN
ETH_RXN
13
USB_DM
USB_DM
I/O
,28
Document No.: WMB20150921
Ethernet
interface
USB 2.0 host
Page 7 of 20

Doc Title
Number
Version
Wireless smart audio module
WMB20150921
1.0
14
USB_DP
USB_DP
I/O
15
I2C_CLK
I2C_CLK
I2C interface, in module 4.7K
16
I2C_SDA
I2C_SDA
I/O
resistor pull-up
Module reset
CPU_RST
I,IPU
17
18
Reset with pull down, reset
time >300ms
First Input 0 and keep for more
Restore
factory
setting
nReload
I/O, IPU
than 5 seconds then change to 1,
it will go back to factory setting,
in module 4.7K resistor pull-up
19
GPIO
GPIO5
I/O, IPU
in module 4.7K resistor pull-up
22
GPIO
GPIO2
I/O, IPU
in module 4.7K resistor pull-up
23
GPIO
GPIO1
I/O, IPU
in module 4.7K resistor pull-up
24
UART receive
UART_RXD
I,
Need keep UART_TXD high
25
UART transmit
UART_TXD
O, IPU
during chip boot-up
26
GPIO
GPIO4
I/O, IPU
27
GPIO
GPIO3
I/O,IPU
37
Reference CLK
REF_CLK
O,IPD
Reference Clock Output
29
SDIO Data
SD_D2
I/O
SDIO, GPIO 10K Pull-up
30
SDIO CMD
SD_CMD
SDIO CMD, GPIO, 10K IPU
31
SDIO Data
SD_D0
I/O
SDIO Data0, GPIO,10K IPU
32
SDIO Detect
SD_CD
SDIO detect, GPIO, 10K IPU
33
SDIO WP
SD_WP
Write Protect, GPIO, 10K IPU,
If MICRO SD (TF), need put
this pin to GND
34
SDIO Data
SD_D1
I/O
SDIO Data 1, GPIO, 10K IPU
35
SDIO CLK
SD_CLK
SDIO CLK, GPIO
36
SDIO Data
SD_D3
I/O
SDIO Data 3, GPIO, 10K IPU
Table 2-1 LinkPlay A31-2 module pin description
Notes:
1. I: Input, O: Output, P: Power, IPU: Internal Pull Up, IPD: Internal Pull Down, A: Analog.
2.2. Mechanical dimension
LinkPlay A31-2 module has the physical dimension of 28.5 x 38.7mm. The detailed layout shows below. The unit
is in mm.
Document No.: WMB20150921
Page 8 of 20

Doc Title
Wireless smart audio module
Number
Version
WMB20150921
1.0
Figure 2-2: LinkPlay A31-2 physical dimension
2.3. Connect with Audio Codec
LinkPlay A31-2 module has digital audio interface I2S. It supports both master and slave modes.
- Master mode:
In master mode, it is recommended to connect with an audio codec IC for audio playback and record shown in the
following example. Current module firmware supports Wolfson WM8918/WM8960. The reference schematics is
shown below.
Document No.: WMB20150921
Page 9 of 20

Doc Title
Wireless smart audio module
Number
Version
WMB20150921
1.0
Table 2-3 Connect with external audio IC with A31-2 module
Notes:
Please see the following documents for details:
WIFIAudio_Module_Design_Note_V03.pdf
WIFIAudio A31-2 Reference Design_4.pdf
- Slave mode:
When A31-2 module is working as I2S slave mode, it needs the external input for both I2S_WS and I2S_CLK.
Here we use the MVSilicon’s MCU/Codec chip AP8048/AP8064 as an example to explain how to connect the
module as the I2S slave. The connection method and function description are as follows:
1) Case 1: Wi-Fi, BT or AUX IN can be connected to AP8048/8064 directly. The AP8048 etc. will decide which
source ( Wi-Fi/BT/AUX IN) is output to connected digital amplifier.
How to connect I2S pin of A31-2: I2S DATA OUT of A31-2 is connected to I2S DATA IN of
AP8048/8064. The I2S DATA OUT of AP8048 is connected to the amplifier. The advantage of doing this is:
power saving, i.e., Wi-Fi or BT could be switched off independently.
Document No.: WMB20150921
Page 10 of 20

Doc Title
Wireless smart audio module
Number
Version
WMB20150921
1.0
2) Case 2: AUX IN and BT could be converted to digital I2S input for A31-2 by AP8048. It is possible to
re-transmit these inputs through Wi-Fi to other speakers and output it to digital amplifier simultaneously.
Therefore, we could achieve the multi-room audio for Aux-in and BT sources with this configuration.
To connect with amplifier with digital input, the I2S DATA OUT of AP8048 is connected with DATA IN of
A31-2, DATA OUT of A31-2 is connected with amplifier. A31-2 will be responsible for receiving data then
re-transmit to other slave speakers during multi-room playback
To connect with amplifier with analog input, the I2S DATA OUT of AP8048 needs to be connected with the
I2S DATA IN of A31-2, and I2S DATA OUT of A31-2 needs to be connected with the DATA IN of AP8048.
AP8048 will be responsible for output analog audio data to amplifier.
Notes: There is an advantage to use amplifier with analog input. The EQ module in AP8048 could be used to
improve the sound quality.
Notes:
Please see the following documents for details:
WIFIAudio_Module_Design_Note_V03.pdf
WIFIAudio A31-2 Reference Design_1/2/3.pdf
2.4. External antenna
A31-2 uses the external antenna for best Wi-Fi performance. To use external antenna, please choose the antenna
type that meets the requirement of IEEE 802 b/g/n WiFi standard running at 2.4GHz frequency. The detailed
parameters are shown in the table below.
Items
Parameters
Frequency range
2.4~2.5GHz
Impedance
50 Ohm
VSWR
2 (Max)
Reflection loss
-10dB (Max)
Connector
I-PEX or populate directly
Table 2-5 A31-2 external antenna parameters
2.5. 10/100M Ethernet Port
A31-2 module provides 10/100Mbps Ethernet interface pins that could be used to connect with Ethernet RJ45
socket. It has built-in transformer.
Document No.: WMB20150921
Page 11 of 20

Doc Title
Number
Version
Wireless smart audio module
WMB20150921
1.0
2.5.1. Connect the module with RJ45
To provide 10/100Mbps Ethernet functionality, you could connect the module with the RJ45 socket via a Ethernet
transformer. The detailed diagram is as follows:
ETH_TXN
ETH_TXP
CAP3
ETH_RXN
U5
RJ-45X1P
U4
HN1674DG
R X
T X
MB4_N
14
13
12
MB4_P
CMT4
MA4_N
10
MA4_P
CMT4
R94 2
1 75R
1 75R
R100 2
1 75R
R95
MA4_P
MA4_N
MB4_P
WAN_C1
MB4_N
C86
0.1uF
C84 1
2 0 ohm/SB
GND
C85 1
2 0 ohm/SB
C87
2 CHGND
1000pF/2KV/NC
WAN_C2
L A N
P O R T 1
CHGND
ETH_RXP
16
GND
Figure 2-4 The reference design of Ethernet
2.6. USB host port
A31-2 module provides high speed USB2.0 host interface. To connect with USB port, the reference design is
shown below.
Figure 2-5 USB host interface
Please follows the following design rule to populate the USB host interface:
Item
Signal Group
Document No.: WMB20150921
Parameter
USB
Page 12 of 20

Doc Title
Wireless smart audio module
Topology
Reference Plane
Characteristic Trace Impedance (Zo)
Trace Width
Serpentine Spacing(center to center)
Minimum Isolation Spacing to Clock Signals
Minimum Isolation Spacing to Low-Speed Signals
Minimum Isolation Spacing to other USB Pair
Total Length (with package length)
Maximum Recommended Via Count
DM to DP Length Matching(with package length)
Number
Version
WMB20150921
1.0
Differential Pair Point-to-Point
Ground Referenced
90 Ω ±10%
4 mils
8.5 mils
50 mils
20 mils
20 mils
Max = 8000 mils
2 (per side)
Match total length to within ±10 mils
Table 2-6 WiFiAudio-A31-2 USB design rule
2.7. Power supply
A31-2 module can be powered with single power supply with voltage between 3.5V and 5.5V. The peak current is
around 300mA, the normal working current is 170mA. In sleep mode (when Wi-Fi is off), the current is 20mA.
The power supply is important for system stability and Wi-Fi performance. It is recommended to use 100uF and
10uF decoupling capacitor in parallel to reduce the ripple of power supply.
2.8. Silkscreen and Package
Remark:
Wiimu:English logo
A31:Internal product code
V03:A31 revision code
Document No.: WMB20150921
Page 13 of 20

Doc Title
Number
Version
Wireless smart audio module
WMB20150921
1.0
Remark:
1 tray: 30 pcs
1 carton: 15 trays
Total of 1 carton:15*30 pcs=450 pcs
3. Software
WiFiAudio-A31-2 supports Airplay and DLNA functionality:
Items
iOS version
Description
 iOS 4.2 and above
 iPhone,iPad,iPod Touch,iPad Mini
iTune version
Network setup

iTunes 10.2 and above

PC, iMac
 A31-2 works in AP Client mode
 Support WPS and proprietary Wi-Fi setup
Support Airplay mode
 Play, Pause, Seek, Volume, Prev, Next
Airplay applications
 Apple Music App.
 QQ Music
 iTunes
 Many third party music applications …
DLNA operations
 Play, Pause, Seek, Volume, Prev, Next
DLNA applications
 Compatible with DLNA certified player, i.e.,
Document No.: WMB20150921

Skifta

BubbleUPnP
Page 14 of 20

Doc Title
Number
Version
Wireless smart audio module
WMB20150921
1.0
 MP3, WMA, WAV, Apple Lossless (ALAC), AAC, AAC+,
Audio format support
FLAC, APE, OGG
 PC:IE9/10, Chrome, Firefox
Browser support
 iOS/MAC OS: Safari
Language support of Web server
 Chinese
 English
 Setup A31-2 network
Setup with web server
 Setup A31-2 device name, add password protection
 Update A31-2 firmware and restore factory setting
 Online update firmware
 Connect device to Internet
Table 3-1 A31-2 software description
3.1. Airplay introduction
AirPlay is the streaming standard developed by Apple Inc. It lets you wirelessly stream what’s on your iOS device
to your HDTV or speaker. It is supported starting from iOS4.2 and OS X Mountain Lion. It can also stream the
music in PC or Mac via iTunes 10.1 or above.
When the user devices (including iMac, PC, iPod touch, iPhone, iPad) are in the same WiFi LAN with the speaker
that supports Airplay, when the user device launches the applications such as iTunes or iOS music applications, the
Airplay button
appears. When click the Airplay button, please choose the speaker that you want to stream
to.
3.2. DLNA introduction
Digital Living Networrk Alliance (DLNA) is an organization formed by companies in consumer electronics,
cellphone and PC fields. The device with DLNA certification could seamlessly works with other DLNA devices
without compatibility issue. The device has
logo.
3.3. WiFi mode
WiFiAudio-A31-2 module is working at WiFi AP Client mode. To setup AP client mode, please setup with web
browser when you connect with the device via WiFi or Ethernet.
Document No.: WMB20150921
Page 15 of 20

Doc Title
Number
Version
Wireless smart audio module
WMB20150921
1.0
3.3.1. AP Client mode
Device working under AP Client could serve as AP and client simultaneously. When it is used as AP, other wireless
device could connect with it directly. Meanwhile, it could connect to other wireless AP as a wireless station. In this
mode, device could connect with WiFiAudio-A31-2 and playback music to this device with airplay or DLNA.
Meanwhile, if WiFiAudio-A31-2 is connected with main wireless AP that is connected to Internet, the device that
is connected with WiFiAudio-A31-2 has access to Internet too.
Figure 3-1 WiFiAudio-A31-2 AP Client mode
3.4. Web Server setup
WiFiAudio-A31-2 module provides built-in web server to let user configure the module via the Internet browser.
In the factory mode, the SSID of WiFiAudio-A31-2’s AP port is in the form of WiFiAudio_xxxx. The xxxx
represent four digital numbers. The IP address, user name and password are shown below:
Parameters
Default setting
SSID
WiFiAudio _xxxx
IP address
10.10.10.254
Mask
255.255.255.0
DNS
WiiMu.com
User name
admin
Password
admin
Table 3-2 WiFiAudio-A31-2 AP default parameters
You could use PC, iOS or Android device connect the WiFiAudio-A31-2 first as wireless AP, then launch the
browser and login to web server and configure the module. It supports IE8.0 or up, Chrome and Safari Internet
browser.
Document No.: WMB20150921
Page 16 of 20

Doc Title
Wireless smart audio module
Number
Version
WMB20150921
1.0
3.4.1. Web server login
When the user devices are in the same network as WIFIAudio-A31-2 the user could login to the built-in web server
by entering “http://10.10.10.254” or “http://wiimu.com” in the Internet browser. Currently, both English and
Chinese language are supported in the web server and could be configured in the setup page. However, it is also
possible to add other language support. The following example is shown in English as it is selected as the default
language in the web server.
If the WIFIAudio-A31-2 device is not connected to another AP to get Internet access, the web server will be
directed to the WIFI setup page. In this page, the user could choose the AP to connect. Otherwise, if it is already
connected with another AP, it will be redirected to the setting page for other settings.
3.4.2. Connecting the module to another AP
In this page, the network information such as the connected AP and list of available AP are displayed. Please see
the details in Figure 3-2. The user could select the AP to connect to provide the module with Internet access.
Meanwhile, the module could serve as the AP for other devices that could directly connect with the module. In the
case, the module worked as “AP client” or so called bridge mode.
Document No.: WMB20150921
Page 17 of 20

Doc Title
Wireless smart audio module
Number
Version
WMB20150921
1.0
Figure 3-2 Connect WiFiAudio-A31-2 with another AP
After entering the password for the connected AP, there is pop up message window to remind you that the user
device should be in the same network as WiFiAudio-A31-2 in order to use it , i.e., the user device is connected to
the module directly or the AP that the module is connected to.
Figure 3-3 Keep the device and WIFIAudio-A31-2 in the same network
3.4.3. Advanced setting for the module
Press the setting button in top left corner of the WiFi setup page to enter the page for advanced settings. There are
three setting fields such as device information, module and wireless LAN setting.
3.4.3.1. Module setting page
It is used to perform manual software upgrade, restore factory settings and setup the default language.
3.4.3.1.1.
Software upgrade
Important: software upgrade is the critical operation so please be cautious of doing this. In the process of
Document No.: WMB20150921
Page 18 of 20

Doc Title
Wireless smart audio module
Number
Version
WMB20150921
1.0
software upgrade, please don’t playback any music or any other operation except the software upgrade.
Please don’t disconnect the power for the module during the process.
It is also possible to use the online update if the device is connected with the Internet by press the “Check Online
update” button in the software upgrade page. The module will then check if there is updated version in the remote
maintenance server.
Figure 3-4 Upgrade the module firmware manually
3.5. Use UART to debug
The UART needs setup as follows:
Baud rate
Data bit
Parity bit
Stop bit
57600
None
Document No.: WMB20150921
Page 19 of 20

Doc Title
Flow control
DTR/DSR
RTS/CTS
XON/XOFF
Wireless smart audio module
Number
Version
WMB20150921
1.0
None
None
None
3.6. WPS Setting
WPS (Wi-Fi Protected Setup) is used to simplify the Wi-Fi setup. Working with WPS enabled router, user doesn’t
need choose the Wi-Fi SSID and enter password. Instead, user just needs press the button (PBC mode) and it will
join the network safely.
To enter the WPS mode, keep low pulse ( 300ms < t <5s) for “nReload” pin in A31-2 module.
3.7. Restore to factory setting
To restore the factory setting for the module, keep low pulse for t >5s for “nReload” pin in the A31-2 module.
When the factory setting is restored, the system will reboot automatically.
Document No.: WMB20150921
Page 20 of 20
FCC Warning
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.
NOTE: Any changes or modifications to this unit not expressly approved by the party responsible for compliance
could void the user's authority to operate the equipment.
FCC Radiation Exposure Statement:
This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. End users
must follow the specific operating instructions for satisfying RF exposure compliance.
Note 1: This module certified that complies with RF exposure requirement under portable or mobile or fixed
condition, this module is to be installed only in portable or mobile or fixed applications.
A portable device is defined as a transmitting device designed to be used so that the radiating structure(s) of the
device is/are within 20 centimeters of the body of the user
A mobile device is defined as a transmitting device designed to be used in other than fixed locations and to
generally be used in such a way that a separation distance of at least 20 centimeters is normally maintained
between the transmitter's radiating structure(s) and the body of the user or nearby persons. Transmitting devices
designed to be used by consumers or workers that can be easily re-located, such as wireless devices associated
with a personal computer, are considered to be mobile devices if they meet the 20 centimeter separation
requirement.
A fixed device is defined as a device is physically secured at one location and is not able to be easily moved to
another location.
Note 2: Any modifications made to the module will void the Grant of Certification, this module is limited to OEM
installation only and must not be sold to end-users, end-user has no manual instructions to remove or install the
device, only software or operating procedure shall be placed in the end-user operating manual of final products.
Note 3: The device must not transmit simultaneously with any other antenna or transmitter.
Note 4: To ensure compliance with all non-transmitter functions the host manufacturer is responsible for ensuring
compliance with the module(s) installed and fully operational. For example, if a host was previously authorized as
an unintentional radiator under the Declaration of Conformity procedure without a transmitter certified module
and a module is added, the host manufacturer is responsible for ensuring that the after the module is installed and
operational the host continues to be compliant with the Part 15B unintentional radiator requirements. Since this
may depend on the details of how the module is integrated with the host, LM Technologies Ltd. shall provide
guidance to the host manufacturer for compliance with the Part 15B requirements.
Note 5: FCC ID label on the final system must be labeled with “Contains FCC ID: 2AAPP-A3 1 or “Contains
transmitter module FCC ID: 2AAPP-A3 1”.
The transmitter module must be installed and used in strict accordance with the manufacturer's instructions as
described in the user documentation that comes with the host product. Wiimu Information Technology Inc. is
responsible for the compliance of the module in all final hosts.
Download: A31 Wireless Audio Module User Manual 15_A31  UserMan Wiimu Information Technology Inc.
Mirror Download [FCC.gov]A31 Wireless Audio Module User Manual 15_A31  UserMan Wiimu Information Technology Inc.
Document ID3034717
Application IDWmQIqAF5uSZ6XEhiKGK6TQ==
Document Description15_A31 UserMan.pdf
Short Term ConfidentialNo
Permanent ConfidentialNo
SupercedeNo
Document TypeUser Manual
Display FormatAdobe Acrobat PDF - pdf
Filesize65.4kB (817533 bits)
Date Submitted2016-06-21 00:00:00
Date Available2016-06-21 00:00:00
Creation Date2016-04-20 14:05:47
Producing SoftwareAcrobat Distiller 9.0.0 (Windows)
Document Lastmod2016-06-13 11:41:07
Document Title15_A31 UserMan
Document CreatorPScript5.dll Version 5.2.2
Document Author: WANG

Source Exif Data [exif.tools]:
File Type                       : PDF
File Type Extension             : pdf
MIME Type                       : application/pdf
PDF Version                     : 1.5
Linearized                      : No
Author                          : WANG
Create Date                     : 2016:04:20 14:05:47+08:00
Modify Date                     : 2016:06:13 11:41:07+08:00
XMP Toolkit                     : Adobe XMP Core 4.2.1-c043 52.372728, 2009/01/18-15:08:04
Creator Tool                    : PScript5.dll Version 5.2.2
Metadata Date                   : 2016:06:13 11:41:07+08:00
Format                          : application/pdf
Title                           : Microsoft Word - WiFi Audio A31-2 User Manual (English) V1.0.doc
Creator                         : WANG
Producer                        : Acrobat Distiller 9.0.0 (Windows)
Document ID                     : uuid:0cd43eed-fb22-4850-b8bf-849eb5bc3852
Instance ID                     : uuid:f5a6048b-3350-4c43-be96-0316cae560bc
Page Count                      : 22