WiFi and Ethernet Shield
With WiFi Audio
User Manual
MAY 25, 2013
Rev 1.0
Copyright © 2013 WiiMu Information Technology Inc.
Doc Title WiiMu-A02 WIFI Audio Specification
WiiMu Information Technology Inc.
Number
Version 1.2
WMB20130110
HISTORY
Version Date Description Author
K8
Document No.: WMB20130110 Page 2 of 15
Doc Title WiiMu-A02 WIFI Audio Specification
WiiMu Information Technology Inc.
Number
Version 1.2
WMB20130110
INDEX
Features .......................................................................................................................................................................5
1.1. Parameters............................................................................................................................................... 6
2. Hardware Description................................................................................................................................. 7
2.1. Description of hardware interface ........................................................................................................... 7
2.2. Mechanical dimension............................................................................................................................. 9
2.3. Audio output ............................................................................................................................................9
2.4. External antenna ....................................................................................................................................10
2.5. 10/100M Ethernet Port ..........................................................................................................................11
2.5.1. Connect the module with RJ45 with transformer .............................................................................. 11
2.5.2. Transfer the data from the module to user board via Ethernet interface directly............................... 11
2.6. USB host port ........................................................................................................................................12
2.7. Power supply .........................................................................................................................................13
2.8. Status LED............................................................................................................................................. 13
3. Software ....................................................................................................................................................14
3.1. Airplay introduction...............................................................................................................................15
3.2. DLNA introduction................................................................................................................................ 15
3.3. WiFi mode ............................................................................................................................................. 15
3.3.1. AP Client mode .......................................................................................................................15
3.4. Web Server setup ................................................................................................................................... 16
Document No.: WMB20130110 Page 3 of 15
Doc Title WiiMu-A02 WIFI Audio Specification
Features
Support 802.11 b/g/n networks
Support 10/100Mbps Ethernet
Standard WiFi and Ethernet Shield two in one
Support Internet audio streaming via Apple Airplay or DLNA
Support TCP/IP/UDP protocol
Support STA/AP/AP Client mode
Support UART and Ethernet Interface
Support audio output via 3.5mm audio jack
Built-in web server to easily configure the module
Support WiFi UART via AT command
WiiMu Information Technology Inc.
Number
Version 1.2
WMB20130110
Applications
WiFi speaker
WiFi audio docking station for smartphones
WiFi remote control
Portable WiFi base station with Airplay
WiFi/Ethernet shield two in one for Arduino
Document No.: WMB20130110 Page 4 of 15
Doc Title WiiMu-A02 WIFI Audio Specification
WiiMu Information Technology Inc.
Number
Version 1.2
WMB20130110
1. Overview
WiiMu-A02 module is developed by Wiimu Information Technology Inc. It could be used in wireless speaker,
wireless docking station, WiFi base station and WiFi remote control. It supports 802.11b/g/n standard with up to
150Mbps 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. With this module, you can play the music on your
speaker wirelessly from iPhone, iPad , iPod touch, Android devices or PC devices.
1.1. Parameters
Wireless
Hardware
Software
Certification FCC/CE
Standard 802.11 b/g/n
Frequency 2.412GHz-2.484GHz
Transmit
Receive sensitivity
Antenna options
Work voltage 5.0V (+/-5%)
Work current 170mA~300mA
Work temperature
Storage temperature
Size
WiFi working mode AP Client (by default)/AP/STA
Security WEP/WPA-PSK/WPA2-PSK/WAPI
Encryption WEP64/WEP128/TKIP/AES
User Configuration Web server
Software Update Web server
Audio streaming
protocol
Items Performance
802.11b: +20dBm(Max.)
802.11g: +18dBm(Max.)
802.11n: +15dBm(Max.)
802.11b: -89dBm
802.11g: -81dBm
802.11n: -71dBm
ExternalI-PEX
Internalon board antenna
-25 - 85
-40 - 135
33×48×3mm 28-pin SMT
AirPlay
DLNA
Table 0-1 WiiMu-A02 parameters
Document No.: WMB20130110 Page 5 of 15
Doc Title WiiMu-A02 WIFI Audio Specification
WiiMu Information Technology Inc.
Number
WMB20130110
Version 1.2
2. Hardware Description
2.1. Description of hardware interface
WiiMu-A02 module provides two options to connect with customer board either through its 28-pins DIP or SMT
pads.
ANT
5VD
GND GND OUT_L AGND OUT_R
RF Connector
5VD
5VD
SPI_CS1
Reserved
GPIO_19
GPIO_20
Reserved
Reserved
Eth_TX+
Eth_TX-
Eth_RX-
Eth_RX+
USB-
USB+
15
16
17
18
19
20
21
22
23
24
25
26
27
28
14
13
12
11
10
OUT_L
AGND
OUT_R
1V8_Output
nReload
9
8
7
6
5
4
3
2
1
UART_TXD
UART_RXD
GND
GND
nRST
nReady
SPI_CLK
SPI_MOSI
SPI_MISO
Figure 2-1 WiiMu-A02 interface pins
Document No.: WMB20130110 Page 6 of 15
Doc Title WiiMu-A02 WIFI Audio Specification
Pin description
Pin Description Net Type Comments
6,7 GND GND Power Ground
15,16 5VD 5VD Power +5V@ 350mA
1 SPI data SPI_MISO I/O
2 SPI data SPI_MOSI I/O
3 SPI clock SPI_CLK I/O
17 SPI chip select SPI_CS1 I/O
4 Module ready
5 Module reset nRST I,IPU Reset with pull down, reset time
8 UART data receive UART_RXD I,IPD
9 UART data send UART_TXD O,IPD
10 Reset factory
11 Output 1.8V 1V8_Output O 1.8V@300mA, used for Ethernet
12 Audio output-R OUT_R A
13 AGND AGND Power
14 Audio output-L OUT_L A
18 Reserved pin Reserved I/O, IPD Reserved, keep float
19 GPIO GPIO_19 I/O, IPD
20 GPIO GPIO_20 I/O, IPD
21 Reserved pin Reserved I/O, IPD Reserved, keep float
22 Reserved pin Reserved I/O, IPD Reserved, keep float
23 Ethernet Output+ PHY_TX+ O
24 Ethernet Output- PHY_TX- O
25 Ethernet Input- PHY_RX- I
26 Ethernet Input+ PHY_RX+ I
27 USB input- USB- I
28 USB input+ USB+ I
nReady O,IPU Module finishes the boot-up and
signal
nReload I,IPU Pull down for more than 5
setting
WiiMu Information Technology Inc.
Number
WMB20130110
Version 1.2
SPI interface is configured to
work in master mode, can be
used to connect SD card or other
SPI slave devices
is ready to work output “0”;
Otherwise, output “1”.
>300ms
UART
seconds then pull up, reset the
module with factory setting.
interface
Audio output ports
1.8V TTL interface
(module provides 1.8V reference
voltage via Pin11)
USB 2.0 host interface
Table 2-1 WiiMu-A02 module pin description
Notes
1. I: Input, O: Output, P: Power, IPU: Internal Pull Up, IPD: Internal Pull Down, A: Analog.
Meanwhile,WiiMu-A02 module could work in standalone mode. There are two three pin breakouts that could
connect with 5V voltage input and stereo audio output.
Document No.: WMB20130110 Page 7 of 15
Doc Title WiiMu-A02 WIFI Audio Specification
WiiMu Information Technology Inc.
Number
Version 1.2
WMB20130110
2.2. Mechanical dimension
WiiMu-A02 module has the physical dimension of 33 x 48mm. The detailed layout shows below. The unit is in
mm.
Figure 2-2: WiiMu-A02 physical dimension
2.3. Audio output
WiiMu_A02 module has integrated a high quality audio codec IC with the following performance parameters:
Document No.: WMB20130110 Page 8 of 15
Doc Title WiiMu-A02 WIFI Audio Specification
WiiMu Information Technology Inc.
Number
Version 1.2
WMB20130110
Table 2-3 Audio output parameters
2.4. External antenna
WiiMu-A02 provides two antenna options for different customer applications. The user could use either internal or
external antenna. 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 WiiMu-A02 external antenna parameters
Document No.: WMB20130110 Page 9 of 15
Doc Title WiiMu-A02 WIFI Audio Specification
WiiMu Information Technology Inc.
Number
Version 1.2
WMB20130110
2.5. 10/100M Ethernet Port
WiiMu-A02 module provides 10/100Mbps Ethernet interface pins that could be used to connect with Ethernet
RJ45 socket via transformer. On the other hand, it could be used to transfer data from the module to the customer
base board directly via PHY-to-PHY connection. Moreover, the module also provides the 1.8V reference voltage
for the Ethernet transformer.
2.5.1. Connect the module with RJ45 with transformer
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:
Figure 2-4 The reference design of Ethernet via transformer
2.5.2. Transfer the data from the module to user board via
Ethernet interface directly
The Ethernet interface could be used to transfer data from the module to customer board through Ethernet interface.
It could save one transformer, one the RJ45 socket and PCB space. The reference circuit diagram is shown below.
The voltage (VCC_PHY) in the figure depends on the PHY chip in the customer board, usually it requires 2.5V
power input.
Document No.: WMB20130110 Page 10 of 15
Doc Title WiiMu-A02 WIFI Audio Specification
Table 2-5 The reference design of Ethernet
2.6.
USB host port
WiiMu Information Technology Inc.
Number
Version 1.2
WMB20130110
WiiMu_A02 module provides high speed USB2.0 host interface. To connect with USB port, the reference design is
shown below.
Figure 2-6 USB host interface
Please follows the following design rule to populate the USB host interface:
Item Parameter
Signal Group
USB
Topology Differential Pair Point-to-Point
Reference Plane Ground Referenced
Characteristic Trace Impedance (Zo) 90 Ω ±10%
Trace Width 4 mils
Serpentine Spacing(center to center) 8.5 mils
Minimum Isolation Spacing to Clock Signals 50 mils
Document No.: WMB20130110 Page 11 of 15
Doc Title WiiMu-A02 WIFI Audio Specification
WiiMu Information Technology Inc.
Number
Version 1.2
WMB20130110
Minimum Isolation Spacing to Low-Speed Signals 20 mils
Minimum Isolation Spacing to other USB Pair 20 mils
Total Length (with package length) Max = 8000 mils
Maximum Recommended Via Count 2 (per side)
DM to DP Length Matching(with package length) Match total length to within ±10 mils
Table 2-6 WiiMu-A02 USB design rule
2.7. Power supply
WiiMu-A02 module is powered with single 5V power supply. The peak current is around 350mA, the normal
working current is 200mA. In sleep mode (when WiFi is off), the current is 100mA.
The power supply is important for system stability and WiFi performance. It is recommended to use 100uF and
10uF decoupling capacitor in parallel to reduce the ripple of power supply.
2.8. Status LED
WiiMu-A02 module provides four status LEDs as the follows:
1. Power supply status
2. WiFi AP status
3. WiFi station status
4. WiFi data transfer status
Status LED of the WiiMu-A02 module:
LED status Description
AP LED off WiFi AP is waiting for connection
AP LED on WiFi AP has the device that connected to the module
Client LED off WiFi AP Client is not connected to any router
Client LED on WiFi AP Client is connected to router, however, it is not
connected to Internet yet
Client LED blinking WiFi AP Client is connected to router and connected to Internet
too
Power LED on WiFi is in boot-up procedure
Power LED blinking slowly ( on:
1 second, off: 1 second)
Power LED blinking fast (on: 0.3
second, off: 0.3 second)
WiFi is running normally
The system is in the process of updating firmware. Please don’t
disconnect the power. Otherwise, the system may be corrupt.
Document No.: WMB20130110 Page 12 of 15
server
Doc Title WiiMu-A02 WIFI Audio Specification
WiFi data LED on The WiFi data transfer is ongoing
Table 2-7 WiiMu-A02 status LEDs
3. Software
WiiMu-A02 supports Airplay and DLNA functionality:
Items Description
iOS version iOS 4.2 and above
iPhoneiPadiPod TouchiPad Mini
iTune version iTunes 10.2 and above
WiiMu Information Technology Inc.
Number
Version 1.2
WMB20130110
PC, iMac
Network setup WiiMu-A02 work in AP Client mode
Support WPS
Support Airplay mode Play, Pause, Seek, Volume, Prev, Next
Support Airplay applications Apple Music App.
QQ Music
iTunes
Many music applications …
Support DLNA operations Play, Pause, Seek, Volume, Prev, Next
Support DLNA applications Compatible with DLNA certified player, i.e.,
Skifta
BubbleUPnP
Supported browser PCIE9/10 Chrome, Firefox
iOS/MAC OS Safari
Supported language of Web
Chinese
English
Setup with web server Setup WiiMu-A02 network
Setup WiiMu-A02device name, add password protection
Update WiiMu-A02firmware and restore factory setting
Table 3-1 WiiMu-A02 Software description
Document No.: WMB20130110 Page 13 of 15
Doc Title WiiMu-A02 WIFI Audio Specification
WiiMu Information Technology Inc.
Number
Version 1.2
WMB20130110
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
WiiMu-A02 module is working at WiFi AP Client mode. To setup AP client mode, please setup with web server.
3.3.1.
3.3.1. AAAAP Client
3.3.1.3.3.1.
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 WiiMu-A02 and playback music to this device with airplay or DLNA. Meanwhile,
if WiiMu-A02 is connected with main wireless AP that is connected to Internet, the device that is connected with
WiiMu-A02 has access to Internet too.
P Client mode
P ClientP Client
mode
mode mode
Document No.: WMB20130110 Page 14 of 15
Doc Title WiiMu-A02 WIFI Audio Specification
Figure 3-1 WiiMu-A02 AP Client mode
WiiMu Information Technology Inc.
Number
Version 1.2
WMB20130110
3.4. Web Server setup
WiiMu-A02 module provides Web server to let user configure the module via the browser.
In the factory mode, the SSID of WiiMu-A02’s AP port is in the form of WiiMu _AP_xxxx. The xxxx represent 4
digital numbers. The IP address, user name and password are shown below:
r
Parameters Default setting
SSID WiiMu _AP_xxxx
IP address 10.10.10.254
Mask 255.255.255.0
DNS WiiMu.com
User name admin
Password admin
Table 3-2 WiiMu-A02 AP default parameters
You could use PC, iOS or Android device connect the WiiMu-A02 first as wireless AP, then launch the browser and
login to web server and configure the module.
Document No.: WMB20130110 Page 15 of 15
Loading...