Data Sheet

SWA52 Module Datasheet Rev 1.3
CONTENTS SUBJECT TO CHANGE WITHOUT NOTICE 5 CONFIDENTIAL
4.1 Typical Sub-Woofer Implementation
A basic AV5100 Wireless Subwoofer system block Diagram is shown in below
Figure 1: AV5100 Wireless Subwoofer Solution Block Diagram
A simple low cost implementation of sub-woofer design is shown in Figure 3. The sub amplifier consists of a
PWM chip plus an output stage device, but no external MCU is required as the SWA52-RX module performs
the control function using the I2C master communication port in conjunction with multiple GPIOs. The SWA52
module is configured to accept nominal 5V power from the main application board. An optional reset signal
can be supplied to the SWA52-RX module and I2C or SPI slave communication can be used to control the
module if required.
Several GPIOs can be used to drive LEDs, or to connect to UI buttons. Typically 2 LEDs may be used and 1
button for pairing purposes. Another button could be used, for example, to implement a “bass enhance”
feature. Another GPIO can be used to control t
he power supply to external system blocks such as the PWM IC and the output stage. The SWA52-RX
module can remain powered up during a standby or low power operating mode; however, a true power-down
mode can be implemented by configuring pin 17 (GPIO15/ADAT2/CEN) to be used as a chip-enable pin that
can be used to power down the AV5100. The SWA52 can also be completely powered down by turning off
the main 5V supply.
If the wireless link is lost (ex. when the sound bar is powered down), the SWA52_RX module can, after a
timeout period, power down the amplifier and output stage sections to conserve power and to help meet
Energy Star requirements.
The I2C master port from the SWA52-RX module (pins 5 and 6 on the connector) can communicate, control,
and initialize external audio ICs such as the PWM chip in this example. Other GPIOs can be used to detect
fault conditions (over temperature etc) and notify the module. The audio is routed from the SWA52-RX
module to the amplifier circuit with the I2S output port which can be configured as either a master or a slave
as required. MCLK can also be generated from the SWA52-RX module as a 12.00 MHz clock if required.