Wistron NeWeb SWA52 Users manual

SWA52 5GHz Module Datasheet

Extended Range Mono/Stereo Wireless Audio System, based on the Avnera AV5100 IC

Different labels and P/Ns are used to
distinguish between TX and RX.

General Description

The SWA52 module is a member of a family of
products representing a new level of system
integration offering customers fast time to
market with a point-to-point mono, or stereo,
wireless connection. These modules are
optimized for low-cost, high-quality and ease­of-use.

The module incorporates Avnera’s proprietary
5GHz wireless audio protocol, designed from
the ground up specifically for audio. It features
low fixed latency, uncompressed CD quality
mono or stereo audio, superior interference
immunity, and inherent coexistence with WiFi.

Extended range is enabled on SWA52 with an
external RF power amplifier (PA), increasing
typical transmit power to as much as 12dBm
typical.

The SWA52 module integrates all features
necessary to complete a wireless stereo or
mono link, including AV5100 Wireless Audio
Chip, printed diversity antennas, PA, shield
can, flash memory, interface connector and all
passive components. Just provide power and
an I2S interface and you are ready to create a
wireless audio link.

The module measures 35 x 35 x 3.5 mm and
is provided with a 24 pin FPC connector.

The module is certified to FCC and CE
standards.

Features

 Audio Interfaces

 I2S Digital Input / Output interface with

>93dB end-to-end digital audio path

 Wireless Range (Typ)

 > 50m Non Line Of Sight (NLOS) range

 > 160m Line Of Sight (LOS) range

 Frequency range: 5.725-5.825 GHz,

continuous dynamic channel selection

 Forward error correction coding, error

detection, and audio-specific error
concealment

 Dual printed PCB diversity antennas for

multipath and fading mitigation

 Auto-search/synch and dynamic channel

selection

 Low, fixed latency

 24 pin FPC or pin header connector

 Sample rate converter: Support for 32 -

96kHz input sample rates

 Customizable firmware for simple, low-cost,

sub-woofer amplifier implementations

 RF parts can-shielded, module meets FCC

part 15 rules for emissions and susceptibility.

 General purpose over-the-air (OTA) serial

interface:

Applications

 Wireless Subwoofers
 Stereo Wireless Rear Speakers
 Soundbar / Audio Video Receiver / BluRay
 Mono/Stereo Audio Channel Transmission

 11 kbps, bi-directional, full duplex

 Support for amplifier control data, meta-

data, and remote control commands

Ordering Options

SWA52-TX: Transmit module with digital audio
input

SWA52- RX: Receive module with digital
audio output

CONFIDENTIAL | PROVIDED UNDER NDA

SWA52 Module Datasheet Rev 1.3

1 Table of Contents

General Description ............................................................................................................ 1

Applications ........................................................................................................................ 1

Ordering Options ................................................................................................................ 1

Features ............................................................................................................................... 1

1 Table of Contents ......................................................................................................... 2

2 Lists of Figures and Tables ......................................................................................... 3

3 Revision History ........................................................................................................... 3

4 SWA52 Functional Description ................................................................................... 4

4.1 Typical Sub-Woofer Implementation ............................................................................................... 5

4.2 SWA52 Module Connections and Interfaces .................................................................................. 7

5 SWA52 Connector Information ................................................................................... 8

6 Electrical, Audio and Timing Specifications ............................................................ 10

6.1 Absolute Maximum Ratings ........................................................................................................... 10

6.2 Recommended Operating Range ................................................................................................... 10

6.3 Electrical Characteristics – DC Characteristics ........................................................................... 10

6.4 Electrical Characteristics – RF PLL Characteristics.................................................................... 11

6.5 Electrical Characteristics – RF RX Characteristics ..................................................................... 11

6.6 Electrical Characteristics – RF TX Characteristics ...................................................................... 12

6.7 Electrical Characteristics – Audio C/CS ....................................................................................... 12

6.8 AV5100 Rate Converter Characteristics ....................................................................................... 13

6.9 I2S Communication Interface Timing ............................................................................................. 14

6.10 I2C Master/Slave Communication Interface Timing (S_SCL, S_SDA) ..................................... 166

7 Ordering Information.................................................................................................. 17

CONTENTS SUBJECT TO CHANGE WITHOUT NOTICE 2 CONFIDENTIAL

SWA52 Module Datasheet Rev 1.3

Revision

Description of Changes

Date

1.0

Initial Draft

11/26/2015

1.3

Final version

12/24/2015

2 Lists of Figures and Tables

Table 1: SWA52 Connector Information ............................................................................................................. 8

Table 2: SWA52 I2S Timing .............................................................................................................................. 14

Table 3: Characteristics of the S_SDA and S_SCL I/Os .................................................................................. 16

Table 4: SWA52 Module Ordering Information ................................................................................................. 17

Figure 1: AV5100 Wireless Subwoofer Solution Block Diagram .................................................................. 5

3 Revision History

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SWA52 Module Datasheet Rev 1.3

4 SWA52 Functional Description

The SWA52 module is available in 2 variations; digital input transmitter module or digital output receiver
module.

There are three available I2S digital audio data inputs/outputs, each of these can be configured to operate as
either a master or a slave - depending on the application, the I2S ports can operate simultaneously as either
inputs or outputs. When configured as slaves, the I2S inputs/outputs can be independently clocked by up to
two external masters. In addition, MCLK can be output from the module to provide a reference clock source to
an external ADC or DAC. MCLK can also be input to the module to provide a reference clock from an
external source.

The hardware for the audio input (transmit) and audio output (receive) versions of the module is identical and
only the firmware loaded onto the module determines its function.

The highly integrated nature of the AV5100 transceiver IC results in few external components being required
for the SWA52 module design. 2 printed PCB antennas are used to achieve increased range, and to achieve
antenna spatial diversity. The extended-range RF path consists of the antennas, associated tuning
components, shield can, the RF switch, RF power amplifer (PA) and two baluns, one connected to each of the
RF input/output ports on the AV5100 IC.

A 16MHz crystal oscillator generates the AV5100 fundamental system clock used as the basis for all RF and
digital audio clocks.

A 2Mb flash memory chip is used to store the module’s application firmware. The AV5100 is able to boot from
internal ROM upon first power up, which enables programming the flash chip with the application firmware
through USB. In addition, Over-the-air Firmware upgrade capability can be enabled through the application
firmware. The module can be controlled from an external host device via the I2C Slave or the SPI Slave data
interfaces. The I2C master port allows the module to control other system audio devices such as a sub­woofer amplifier system without having to add another MCU to the product design. Up to 9 additional GPIOs
are available on the SWA52 module (not including I2C and I2S signals) for implementing different UI features
on the target application. The resources mentioned above can be leveraged to implement low cost sub­woofer designs as outlined below.

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SWA52 Module Datasheet Rev 1.3

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.

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Figure 2: SWA52 Module Simple Sub-Woofer Implementation

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SWA52 Module Datasheet Rev 1.3

Signal Type

Description

+5.0V Supply

The SWA52 hardware is configured to accept a nominal +5.0V supply.

Reset

Active low reset input. This pin is driven from an open collector/drain device such
that it can be pulled to ground for the active reset state but, when released, must
go to a high impedance state. This pin should not be actively driven high, as the
AV5100 internal reset circuit will not operate correctly.

I2S In Port

The I2S input port can be configured as a master or slave. Consequently BCLK
and LRCK can be either inputs or outputs. In addition, MCLK can be sourced by
the module on pin 16. Since the AV5100 IC contains a sample rate converter,
MCLK is not required to be supplied to the module when it is an I2S slave.
CMOS 3.3V logic levels are used for all I2S signals.

I2S Out Port

The I2S output port can be configured as a master or slave. Consequently BCLK
and LRCK can be either inputs or outputs. In addition, MCLK can be sourced by
the module on pin 16. Since the AV5100 IC contains a sample rate converter,
MCLK is not required to be supplied to the module when it is an I2S slave.
CMOS 3.3V logic levels are used for all I2S signals.

I2C Slave Port

The I2C slave port can be used for external host communication and for module
testing. It is assumed that external pull up resistors are connected at the I2C
master communicating with the module.

I2C Master Port

The I2C master port is used to communicate with external audio devices such as
a sub-woofer amplifier. It is assumed that external pull up resistors are included
on the application board.

GPIOs

3.3V CMOS logic level GPIOs available to connect to other devices, or to use as
UI supporting GPIOs for LED and button support. All supported GPIOs can be
configured as outputs or inputs with configurable pull-ups/pull-downs.

4.2 SWA52 Module Connections and Interfaces

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