WNC SWA20 Wireless 2.4GHz Audio Module User Manual

WNC SWA20 Wireless 2.4GHz Audio Module

Product Information

The SWA20 module is a wireless audio module that operates in the 2.4 GHz ISM Band. It is a member of the UL2X family of wireless module products and incorporates Skyworks newest wireless audio chip, Sky76305. The module measures 26 x 60 x 3.3 mm and is provided with a 24 pin FPC connector. It is designed to pass FCC, CE, and IC along with various other regional standards.

Features of the SWA20 module include:

• FW defined TX or RX. Same Module Hardware serves both.
• 32-bit RISC processor sub-system
• High resolution over-the-air audio and Interfaces (FW configuration dependent)
• Up to 120 dB SNR OTA audio path
• 3 x I2S Digital I/O up to 24 bits.
• Stereo USB Audio I/O
• Wireless Range (Typ):

  • 40m Indoor-Line-of-Sight range

  • 75m Outdoor-Line-of-Sight range

• Auto-search/synch, WIFI avoidance and dynamic channel selection
• Sample rate converter: Support for 32-96kHz input sample rates
• General purpose over-the-air (OTA) serial interface / data channel: >120 kb/s wireless data capability
• Support for amplifier control data, metadata, and remote-control commands
• Low, fixed latency OTA audio
• Full-speed USB interface for Audio Device and Human Interface Device
• Inter-channel, Inter-client latency less than 5us (All clients at same sample rate)
• Dual printed PCB diversity antennas for multipath and fading mitigation
• 24 pin FPC connector
• RF parts can-shielded
• Module meets FCC part 15 / CE rules for emissions

Product Usage Instructions

To use the SWA20 module, follow these steps:

1. Ensure that you have a power source and an I2S interface available.
2. Connect the SWA20 module to the power source and the I2S interface using the provided 24 pin FPC connector.
3. Once the module is powered on and connected, it will create a wireless audio link.
4. For transmitting audio, configure the module as a transmitter (TX) using firmware-defined settings.
5. For receiving audio, configure the module as a receiver (RX) using firmware-defined settings.
6. The module supports high-resolution over-the-air audio and interfaces. The specific capabilities depend on the firmware configuration.
7. The wireless range of the module is typically greater than 40m indoors and greater than 75m outdoors in line-of-sight conditions.
8. The module features auto-search/synch, WIFI avoidance, and dynamic channel selection to ensure optimal performance.
9. It also supports sample rate conversion for input sample rates ranging from 32 to 96kHz.
10. The module has a general-purpose over-the-air (OTA) serial interface/data channel with a wireless data capability of more than 120 kb/s.
11. It can be used to transmit and receive amplifier control data, metadata, and remote-control commands.
12. The module provides low, fixed latency OTA audio for real-time audio applications.

General Description

The SWA20 module is a member of the UL2X family of wireless module products. The UL2X module product concept offers customers fast time to market for point-to-multipoint mono, stereo, or multichannel wireless audio connection. It incorporates Skyworks newest wireless audio chip, Sky76305.
The UL2X family of devices are the 5th generation of Skyworks cognitive transceivers. They operate in the 2.4 GHz ISM Band. The audio system protocol that they utilize is known as UL2X. The SKY76305 devices enable wireless audio modules supporting Soundbar, TV speaker accessories as well as general Wireless USB-connected audio applications.
Like its predecessors, uncompressed, very low fixed and synchronized-latency audio is the key differentiator of the new UL2X radio protocol. The SWA20 further builds upon the Skyworks legacy by adding higher channel count, greatly lowered power consumption, more application memory and a modern embedded microcontroller for support of more sophisticated and capable end- products. The SKY76305 is supported by a range of modules intended for various wireless consumer-audio, pro-audio and home-theater applications.
The SWA20 module hardware integrates all components necessary to complete a 2.4 GHz wireless multi-client, multichannel link, including SKY76305 Wireless Audio Chip, printed diversity antennas, 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 26 x 60 x 3.3 mm and is provided with a 24 pin FPC connector.
The module is designed to pass FCC, CE, and IC along with various other regional standards.

Applications

• Hi Resolution Wireless Subwoofer, Front /Rear Speaker
• Dolby ATMOS Soundbars
• Multi-channel Soundbar

Ordering Options

• SWA20-TX: Transmit module with digital audio inputccd
• SWA20-RX: Transmit module with digital audio inputccd

Different label color and WNC P/Ns are used to distinguish between TX and RX.

Certificate of Conformity

Revision History

Photograph

SWA20 Module Connections and Interfaces

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 SKY76305 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 SKY76305 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 SKY76305 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.

SWA20 Connector Information

Table 1: SWA20 Connector Information

No

| ****

Pin Name

| ****

Pin Type

| ****

SKY76305 Pin

| ****

SWA20-TX Pin

Description

| ****

SWA20-RX Pin

Description

---|---|---|---|---|---
1| GPIO32/S_SSB/TDO| Digital I/O| B10| GPIO or SPI

Slave Chip Select or JTAG Test Data Out

| GPIO or SPI

Slave Chip Select or JTAG Test Data Out

2| GPIO31/S_SCLK/TCK| Digital I/O| A9| GPIO or SPI

Slave Serial Clock or JTAG Test Clock

| GPIO or SPI

Slave Serial Clock or JTAG Test Clock

3| GPIO30/S_SDA/S_MOSI/TMS| Digital I/O| B9| GPIO, I2C

Slave Serial Data or SPI Slave Data or JTAG Test Mode Select

| GPIO, I2C

Slave Serial Data or SPI Slave Data or JTAG Test Mode Select

4| GPIO9/S_SCL/S_MISO/TDI| Digital I/O| A34| GPIO I2C Slave Serial Clock or SPI Slave Data Out or JTAG Test Data in| GPIO I2C Slave Serial Clock or SPI Slave Data Out or JTAG Test Data in
5| GPIO28/M_SDA| Digital I/O| B8| GPIO, I2C

Master Serial Data

| GPIO, I2C

Master Serial Data

6| GPIO27/M_SCL| Digital I/O| A8| GPIO, I2C

Master Serial Clock

| GPIO, I2C

Master Serial Clock

7| GPIO26/LINK_LED| Digital I/O| B7| GPIO, or LINK_LED

Output

| GPIO, or LINK_LED

Output

8| GPIO25/PAIR| Digital I/O| A7| GPIO, or input from PAIR Button| GPIO, or input from PAIR Button
9| GPIO24/BCLK1| Digital I/O| B6| GPIO or I2S

Port 1 Bit Clock

| GPIO or I2S

Port 1 Bit Clock

10| GPIO23/WCLK1| Digital I/O| A6| GPIO or I2S

Port 1 Word Clock

| GPIO or I2S

Port 1 Word Clock

11| GPIO10/MCLK| Digital I/O| B38| GPIO or Master Clock| GPIO or Master Clock
12| GND| GND| GND Paddle| GND| GND
13| GPIO21/BCLK0| Digital I/O| A5| GPIO or I2S

Port 0 Bit Clock

| GPIO or I2S

Port 0 Bit Clock

14| GPIO20/WCLK0| Digital I/O| B4| GPIO or I2S

Port 0 Word Clock

| GPIO or I2S

Port 0 Word Clock

15| GPIO19/ADAT0| Digital I/O| A4| GPIO or I2S

Port 0 Audio Data

| GPIO or I2S

Port 0 Audio Data

16| GPIO18/ADAT1| Digital I/O| B3| GPIO or I2S

Port 1 Audio Data

| GPIO or I2S

Port 1 Audio Data

---|---|---|---|---|---
17| GPIO17/ADAT2/CEN| Digital I/O| A3| GPIO or I2S

Port 2 Audio Data (1) or Chip Enable (4)

| GPIO or I2S

Port 2 Audio Data (1) or Chip Enable (4)

18| GPIO15/D+| Digital I/O| A44 or A2| GPIO or USB

Data Plus (2)

| GPIO or USB

Data Plus (2)

19| GPIO14/D-| Digital I/O| B40 or A1| GPIO or USB

Data Minus (2)

| GPIO or USB

Data Minus (2)

20| GPIO13| Digital I/O| A43| GPIO (3)| GPIO (3)
21| RESETN_EXT| Digital Input| B20| RESET signal active low (5)| RESET signal active low (5)
22| GND| GND| GND Paddle| GND| GND
23| VDD| Supply Input| A16 and A38| +3.3V input supply voltage| +3.3V input supply voltage
24| VDD| Supply Input| A16 and A38| +3.3V input supply voltage| +3.3V input supply voltage

Notes:

1. In 6 Channels application, ADAT2 will share I2S clocks from ADAT0 / ADAT1
2. Utilizing pins 18 and 19 as USB D+ and D- requires the firmware to Tri-state GPIOs 14 and 15.
3. Pin 20 (GPIO13) can be utilized to implement a “Data Waiting” interrupt signal for I2C and SPI Slave data communication.
4. Pin 17 is configured as GPIO17 by hardware in default. Utilizing this pin for CEN requires different hardware stuffing option.
5. Pin 21 (RESET_EXT) can be pulled to GND with a switch or an open drain/collector type device to provide a hard reset signal to the SKY76305. This pin is pulled up to VDDIO (3.3V) internally in the SKY76305 and should not be actively driven high.

Electrical, Audio and Timing Specifications

Module ESD spec.

Notes:

1. HBM = ESD Human Body Model; C = 150pF, R = 330Ω ; non-operational mode.

Absolute Maximum Ratings

Recommended Operating Range

Electrical Characteristics – DC Characteristics

Test Conditions: TA=+25ºC, VDD=+5.0V

RX mode (continuous RX) Link mode ( for SWA20 TX) Link mode ( for SWA20 RX)

TX mode (continuous TX);

| 200

9

11(tbd) 11(tbd)

15

| uA mA mA

mA

 | Pout=+13dBm|  |
CMOS I/O Logic Levels – 1.8V I/O
Input Voltage Logic Low, VIL|  |  |  | 0.6| V
Input Voltage Logic High, VIH|  | VDDIO -0.6|  |  | V
Output Voltage Logic Low, VOL|  |  |  | 0.3| V
Output Voltage Logic High, VOH|  | VDDIO -0.3|  |  | V
---|---|---|---|---|---

Electrical Characteristics – RF PLL Characteristics

Test Conditions: TA=+25ºC, VDD=+5.0V

Electrical Characteristics – RF RX Characteristics

Test Conditions: TA=+25ºC, VDD=+5.0V

*b : The sensitivity been defined with BER <= 0.002.

Electrical Characteristics – RF TX Characteristics

Test Conditions: TA=+25ºC, VDD=+5.0V

Electrical Characteristics – Audio C/CS

Frequency Response (-3dB)

| 24 bit audio, subwoofer OTA sample rate| 20|  | 5K| Hz
24 bit audio, CD OTA sample rate| ****

20

|  | ****

20K

| ****

Hz

24 bit audio, Hi OTA sample rate*c| ****

20

|  | ****

40K

| ****

Hz

Gain Flatness1| 0dB Input / Output Gain|  | ±0.2|  | dB

SNR

| ****

I2S Input / Output

| ****

93

|  | ****

117

| ****

dB

*c: Specific version only – please contact Skyworks for more details

I2S Communication Interface Timing

Table 2: SWA20 I2S Timing

MIN                 TYP                MAX         UNIT NOTES

VL| low voltage level|  | 0.0V| 0.4V| V|
VH| high voltage level| 2.4V| 3.3V|  | V|
T| clock period|  | 325.5n|  | s| 1/3.072MHz
TLo| clock low period| 0.4T|  | 0.6T|  |
THi| clock high period| 0.4T|  | 0.6T|  |
TR| rise time|  |  | 50n| s| Note 1
TF| fall time|  |  | 50n| s| Note 1
TSu| setup time| 25n|  |  | s|
THd| hold time| 25n|  |  | s|
TOd| output delay| -25n|  | 25n| s|
 | bit clocks/word clock|  | 64|  |  |

I2S protocol is “I2S Justified” as shown below.

Note 1: The timing specified for the rise and fall times represents the edge rates on the module itself. The rise and fall times of the I2S signals are determined by ESD/EMI mitigation components on the modules, as well as external loading, and will be higher than the specified numbers

I2C Master/Slave Communication Interface Timing (S_SCL, S_SDA)
The SWA20 has both I2C slave and master interfaces available with their respective pins S_SCL, S_SDA and M_SCL, M_SDA. The interfaces operate in I2C fast-mode and can receive and transmit at up to 400 kbit/s.
Bytes are 8 bits long and are transferred with the most significant bit (MSB) first. Each byte has to be followed by an acknowledge bit. The SWA20 will apply clock-stopping (by holding the clock line S_SCL LOW to force the master into a wait state) if necessary due to internal high-priority tasks.
The slave/master interface can be used both for writing (e.g. sending commands) or reading (e.g. requesting status). An additional GPIO pin on the SWA20 (Ex. GPIO24), can be used to notify the I2C master when a pending message is ready to be sent.
The SWA20 slave interface responds to the 7-bit slave address TBD as shown in Figure 1 below.

Figure 5: First Byte after the START Procedure

ELECTRICAL SPECIFICATIONS AND TIMING

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

Output fall time from VIHmin to VILmax with a bus capacitance from 10 pF to 400 pF| tof| 0| 250| ns
Pulse width of spikes which must be

suppressed by the input filter

| tSP| 0| 50| ns
S_SCL clock frequency| fSCL| 0| 400| kHz
LOW period of the S_SCL clock| tLOW| 1.3| –| ms
HIGH period of the S_SCL clock| tHIGH| 0.6| –| ms
Data hold time| tHD;DAT| 100| –| ns
Data set-up time| tSU;DAT| 100| –| ns

Figure 6: Definition of Timing for F/S-Mode Devices on the I2C-Bus

Ordering Information

Table 4: SWA20 Module Ordering Information

Module Part

Number

| Option

Code

| Description
---|---|---
SWA20| TX| Digital Input , FPC Connector, integrated printed PCB antennas
SWA20| RX| Digital Output, FPC Connector, integrated printed PCB antennas

Suggested clearance area for SWA20 printed antennas

Hereunder clearance suggestions are mainly for metal or conductive material nearby .

Precaution for Use

Be aware of the following limits before using this wireless module.

• Do NOT subject this wireless module to high temperatures, direct sunlight or moisture.
• Do NOT bend, or subject this wireless module to strong impacts.
• Do NOT disassemble or alter this wireless module in any way.
• Do NOT attempt to install this wireless module in any incompatible device.
• Do NOT remove this wireless module from product during operation.
• Data transmitted and received over radio waves may be intercepted and monitored.
• To avoid malfunctions caused by radio wave interference, please keep product away from the devices such as other wireless devices, microwave and the devices operating at 2.4GHz/5GHz when using this wireless module. Depending on the area, this wireless module may not be available.

FCC statement
Federal Communication Commission Interference Statement
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one of the following measures:

• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.

CAUTION :
Any changes or modifications not expressly approved by the grantee of this device could void the user’s authority to operate the equipment.
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.

Radiation Exposure Statement (For Mobile)
This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with minimum distance 20cm between the radiator & your body.

FCC Radiation Exposure Statement (For Portable)
This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment and meets the FCC radio frequency (RF) Exposure Guidelines. This equipment has very low levels of RF energy that is deemed to comply without testing of specific absorption rate (SAR)

Additional testing, Part 15 Subpart B disclaimer

This transmitter module is tested as a subsystem and its certification does not cover the FCC Part 15 Subpart B (unintentional radiator) rule requirement
applicable to the final host. The final host will still need to be reassessed for compliance to this portion of rule requirements if applicable.
As long as all conditions above are met, further transmitter test will not be required. However, the OEM integrator is still responsible for testing their end-product for any additional compliance requirements required with this module installed.
IMPORTANT NOTE:
In the event that these conditions can not be met (for example certain laptop configurations or co-location with another transmitter), then the FCC authorization is no longer considered valid and the FCC ID can not be used on the final product. In these circumstances, the OEM integrator will be responsible for re-evaluating the end product (including the transmitter) and obtaining a separate FCC authorization.
The host manufacturer should reference KDB Publication 996369 D04 Module Integration Guide

Manual Information To the End User
The OEM integrator has to be aware not to provide information to the end user regarding how to install or remove this RF module in the user’s manual of the end product which integrates this module.
The end user manual shall include all required regulatory information/warning as show in this manual.

OEM/Host manufacturer responsibilities
OEM/Host manufacturers are ultimately responsible for the compliance of the Host and Module. The final product must be reassessed against all the essential requirements of the FCC rule such as FCC Part 15 Subpart B before it can be placed on the US market. This includes reassessing the transmitter module for compliance with the Radio and EMF essential requirements of the FCC rules. This module must not be incorporated into any other device or system without retesting for compliance as multi-radio and combined equipment

LABEL OF THE END PRODUCT:
The final end product must be labeled in a visible area with the following: “Contains FCC ID: NKR-SWA20”. The grantee’s FCC ID can be used only when all FCC compliance requirements are met.

IC Statement

Industry Canada statement

This device complies with ISED’s licence-exempt RSSs. 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.

Radiation Exposure Statement (For Mobile)
This equipment complies with ISED radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with greater than 20cm between the radiator & your body.
This device is intended only for OEM integrators under the following conditions:

1. The antenna must be installed and operated with greater than 20cm between the antenna and users (For Mobile)
2. The transmitter module may not be co-located with any other transmitter or antenna.
3. Module approval valid only when the module is installed in the tested host or compatible series of host which have similar RF exposure characteristic with equal or larger antenna separation distance.

As long as 3 conditions above are met, further transmitter test will not be required. However, the OEM integrator is still responsible for testing their end-product for any additional compliance requirements required with this module installed.

IMPORTANT NOTE:
In the event that these conditions can not be met (for example certain laptop configurations or co-location with another transmitter), then the Canada authorization is no longer considered valid and the IC ID can not be used on the final product. In these circumstances, the OEM integrator will be responsible for re-evaluating the end product
(including the transmitter) and obtaining a separate Canada authorization.

End Product Labeling (For Mobile)
This transmitter module is authorized only for use in device where the antenna may be installed and operated with greater than 20cm between the antenna and users. The final end product must be labeled in a visible area with the following:
“Contains IC: 4441A-SWA20”.

Manual Information To the End User

The OEM integrator has to be aware not to provide information to the end user regarding how to install or remove this RF module in the user’s manual of the end product which integrates this module.
The end user manual shall include all required regulatory information/warning as show in this manual.

Caution :
(iv) where applicable, antenna type(s), antenna models(s), and worst-case tilt angle(s) necessary to remain compliant with the e.i.r.p. elevation mask requirement set forth in section 6.2.2.3 shall be clearly indicated.

Table for Antenna

Preliminary datasheet (subject to change w/o notice) | PROVIDED UNDER NDA

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