Doc Title Wireless smart audio module
Number
WMB20150921
Document No.: WMB20150921 Page 12 of 21
- Slave mode:
When A31 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: I2S DATA OUT of A31 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.
2） Case 2: AUX IN and BT could be converted to digital I2S input for A31 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, DATA OUT of A31 is connected with amplifier. A31 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, and I2S DATA OUT of A31 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：
LinkPlay WiFi Audio A31_Module_Design_Note_V03.pdf
LinkPlay WiFi Audio A31 Reference Design_1/2/3.pdf
2.4. External antenna
LinkPlay WiFi Audio A31 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
To Next Page
Loading...