©2008-2012 Gigawit Electronics Ltd. Version 1.1 Page 1 of 17

GWK5Nx Datasheet

GWK5Nx 2.4GHz Wireless Audio Transmitter / Receiver

1. General Description GWK5Nx is the digital audio interface version of Gigawit GWK5 family wireless digital audio products. It is designed to interface with the DSP or digital amplifiers directly. GWK5Nx supports most of I2S format and sample rates. Inheriting from its GWK5 family, GWK5Nx features both good wireless performance and audio performance. GWK5Nx has good RF co-existence and robust link quality, can combat the most interference from the crowded 2.4G ISM band. GWK5Nx uses non-compression PCM signal thus delivering very low THD audio. By adopting advance forward error correction and error concealment algorithm, GWK5Nx can reach <15ms latency, this makes it ideal for the Video synchronization, Home Theater applications. GWK5Nx‘s built-in high-speed 32bit processor also offers some added value functions such as Volume, Treble/Bass, Balance, 2-way Remote control and etc. It will help customers to reduce the total system cost.

2. Applications 5.1 Speakers Headphones Surround Speakers Microphones CD Player, DVD Player Stereo Audio Dongles

3. Features Small RF foot-print (2MHz bandwidth) and frequency agility scheme enables better 2.4GHz

co-existence Antenna diversity, forward error correction and error concealment for robust audio link None-compression wireless audio transmission with very low THD <15ms low latency, ideal for video synchronization applications Low Power Consumption(Codec not Included) 10+m RF indoor range 1 audio transmitter supports 4 receivers Dedicated 2-way logical data channel for remote control I2S digital audio interface supports 44.1/48/88.2/96/176.4/192 KHz sample rate Supports 2.1 Channel a low-cost extension chip Power management functions for battery powered applications Auto muting function when suffering interference or at poor receiving conditions Built-in Treble/Bass, Volume, Balance Control Flexible design, custom functions supported

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GWK5Nx Datasheet

4. GWK5Nx Form Factor

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GWK5Nx Datasheet

5. Electrical Specification

Table [1]: Electrical Specification

Description Typical

General

Operation voltage +3.3V DC Supply current TX: 45mA RX: 40mA (GWK5NO)

TX: 60mA RX: 60mA (GWK5NQ) Operation temperature -10 ~ +60℃

RF

RF Frequency 2400 ~ 2483MHZ Modulation GFSK Data rate 2M bps TX Power +0dBm (GWK5NO)

+10dBm (GWK5NQ) RX Sensitivity -90dBm (GWK5NO)

-88dBm (GWK5NQ) RF Range (indoor) 10m (GWK5NO)

15m (GWK5NQ)

Audio

Frequency Response 20~20KHz S/N >85dB @ 20~20KHz THD+N < 0.01% @ 20~20KHz Dynamic range 80dB Digital Audio Format I2S, Left Justify, Right Justify Sample Rate Support 44.1/48/88.2/96/176.4/192KHz Latency Fixed 15ms or application dependent

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GWK5Nx Datasheet

6. GWK5Nx Pin Assignment

Pin #

Pin name Type Description

1 NC NA Not Connected 2 NC NA Not Connected 3 KEY I/O Built-in ADC for KEY

4 RST I Reset input, active low

5 RXD I/O UART RX

6 TXD I/O UART TX

7 GP8 I/O General purpose IO

8 GP2 I/O General purpose IO

9 GP3 I/O General purpose IO

10 GP4 I/O General purpose IO

11 GP5 P General purpose IO 12 NC NA Not Connected 13 GND P Ground 14 SCL

/MUTE I/O I2C Clock or MUTE Control, firmware configurable.

When used as I2C, External 4.7K pull-up resister required. 15 SDA

/STANDBY I/O I2C Data or Standby Control, firmware configurable. For

Standby mode, A high level will be asserted when no TX signal >5s. When used as I2C, External 4.7K pull-up resister required.

16 LRCK I/O I2S Left and Right Clock Input / Output 17 SCLK I/O I2S Bit Clock Input / Output 18 I2SMISO I/O I2S Data Master Input / Slave Output

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GWK5Nx Datasheet

19 I2SMOSI I/O I2S Data Master Output / Slave Input 20 MCLK O I2S Master Clock Output, NC when I2S is in slave mode 21 LED I/O Status LED output 22 MFB I/O Power or pairing key input, press long than 3s to turn on or

off the module, press long than 10s to enter pairing mode. 23 3.3V P +3.3V Power Input 24 GND P Ground

Table [2]. GWK5Nx Pin Description

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GWK5Nx Datasheet

7. Application Schematic

R12K

LRCKSCLKSD

IN

SDA

SCL

To DSP I2S Output

GND3.3VIN

MFBLED

SCLSDA

MOSI

SCLK

MCLK

LRCK

GND

MISO

GWK5Nx

KEY

D1LED

+3.3V

To MCU I2C Control

Figure [1]: GWK5Nx Interfacing with DSP (I2S Slave Input Mode)

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GWK5Nx Datasheet

Figure [2]: GWK5Nx Interfacing with ADC

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GWK5Nx Datasheet

R3 470

R5 470

LCH

RCH

C16

2.2n

F/NP

O

C14

2.2n

F/NP

O

C13

10uF

/10V

/X7R

R6 10K

R4 10K

I2SS

DOUT

I2SS

CLK

I2SL

RCK

I2SM

CLK

LRCI

N1

DIN

2BC

KIN

3EN

ABLE

4CA

P5

VOUT

R6

GND

7VD

D8

VOUT

L9

MUT

E10

DVDD

11DE

EMPH

12FO

RMAT

13M

CLK

14U4 W

M85

01

VCC3

3

C810

uF/1

0V/X

7R

C6 0.1u

F/X7

R

DAC_

EN

R2 5R1

+5V

C12

10uF

/10V

/X7R

C15

10uF

/10V

/X7R

J6 Line

out

VA

I2SS

DOUT

DAC_

EN

Vin

1GN

D2

ON/O

FF3

Vout

5

NC4

U2 RT91

93C3

0.1u

F/X7

R

C410

uF/1

0V/X

7R

+5V

VCC3

3

R11

4.7K

12J2

Shun

t for

ISP

R1 0R3.

3VIN

+1

D-2

D+3 4

_5

USB

J5RX

DTX

D

1 2

J4 BAT

+5V

+C1 220u

F/16

V

C50.

1uF/

X7R

1 2 3

J3

C2 0.1u

F/X7

R

D2 1N58

19

R10

1K

I2SS

CLK

I2SL

RCK

I2SM

CLK

TXD

RXD

BLED

SDA

SCL

ADCK

EYRS

TNM

FB

GPIO

8GP

IO2

GPIO

3

GPIO

5GP

IO4

NC123456789101112

13 23222120191817161514 24

J1 GWK5

NO

NC NC3.

3VIN

BLUED1

MFB

SW1

Figure [3]: GWK5Nx Interfacing with DAC

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GWK5Nx Datasheet

8. I2S Digital Audio Interface GWK5Nx supports I2S digital audio interface mode.

1 2 3 n-1 n-2 n…...

Left Channel Right Channel

1 2 3 n-1 n-2 n…...

LRCK

BCLK

SDINSDOUT

1 SCLK 1 SCLK

MSB LSB MSB LSB

1/fs

Figure [4]. I2S Mode

GWK5Nx I2S interface can work as master or slave mode, the IO pin function is described below. The default configuration is GWK5Nx Tx in I2S slave mode, and GWK5Nx RX in left justify master mode. Other configurations are available upon customer request.

Master Mode Slave Mode

MCLK Output, Driving the external DSP or Codec

Non function, can be left open

BCLK Output, Driving the external DSP or Codec

Input, Driven by the external DSP or Codec

LRCK Output, Driving the external DSP or Codec

Input, Driven by the external DSP or Codec

SDIN PCM Data Input PCM Data Input

SDOUT PCM Data Output PCM Data Output

Table [3]: GWK5Nx I2S Interface

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GWK5Nx Datasheet

9. Subwoofer Extension Channel Support GWK5Nx requires an extended interface chip XL9618 to support Subwoofer Channel Input. Below is the schematic.

Figure [5]: Subwoofer Extension Chanel Support Circuit

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GWK5Nx Datasheet

10. I2C Control Interface GWK5Nx features a standard I2C Control interface. The I2C can work as a master or a slave, It can be used to control the peripheral devices or be controlled by the external MCU / DSP. GWK5Nx features a two way wireless logical data channel; The I2C can also be used to exchange the control information between the TX and RX side. I2C Address is 0x0e, it is configurable by firmware.

Register Bit R/W Reset Description

0x00: Control

0: Mute

R/W 0 0: Mute off 1: Mute on

1: Power

R/W 1 0: Power Off 1: Power On

2; Link Status

R 0 0: Not Linked 1: Linked

3: Standby

R/W 0: Standby off 1: Standby on

4-5: Pairing

R/W 0 Write 1 to Enter pairing mode Read back: 0: Normal Mode 1: Pairing in progress, pairing will be timeout in 30 seconds. 2: Paired with success 3: Pairing failed, time is out

6-7: Reserved

R/W 0

0x01: Volume

0-7 R/W 0 Volume 0dB to -48dB 0x00: 0dB 0xd0: -48dB

0x02: Treble

0-7 R/W 0 Treble -14dB to + 14dB 0xf2: -14dB 0x00: 0dB 0x0e: +14dB

0x03: Bass

0-7 R/W 0 Bass -14dB to + 14dB 0xf2: -14dB 0x00: 0dB 0x0e: +14dB

0x04: Balance

0-7 R/W 0 Balance -12dB to + 12dB 0xf4: -12dB 0x00: 0dB 0x0c: +12dB

Table [4] I2C Registers

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GWK5Nx Datasheet

11. ISP Firmware Updating GWK5Nx support ISP firmware updating through UART, When TXD pin connected with a 4.7K resistor to the GND, GWK5Nx will enter the ISP mode.

Figure [6]: Gigawit ISP tool

R14.7K

USB to UARTTXD

RXD

GNDJ1

Short for ISP

GWK5 Module

TXD

RXD

GND

Figure [7]: Gigawit ISP Connection

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GWK5Nx Datasheet

12. Pairing GWK5Nx support ID matching to enable multi TX/RX operating in a same area. The RX will only receive

the paired TX audio signals. To pair the TX and RX module, follow the below steps:

1) Power on the TX and RX Module. The TX/RX LED will keep solid for 5 seconds, and then turn into

Idle Mode and flash slowly.

2) Press the TX key long than 10 seconds Until the LED change into flashing fast. Release the key.

After this, The TX Module will stay into Pairing Mode for 30 seconds until it find the RX (the RX must

be in Pairing Mode in 30 seconds, see Step 3).If the TX found the RX in 30 seconds and paired, the

LED will turn to solid and quit the Pairing Mode, or it will be time out after 30 seconds and turn the

Pairing Mode into the Idle Mode.

3) Press the RX key long than 10 seconds Until the LED change into flashing fast. Release the key.

After this, The RX Module will stay into Pairing Mode for 30 seconds until it find the TX (the TX must

be in Pairing Mode, see Step 2) If the RX found the RX in 30 seconds and paired, the LED will turn

to solid and quit the Pairing Mode, or it will be time out after 30 seconds and turn the Pairing Mode

into the Idle Mode.

4) When the TX and the RX are paired, The TX/RX LED will stay in solid .the RX can receive the TX signal.

PowerOn

LED

KeyPressed>10s

Key KeyReleased

BaseBand PairingMode

≤30s

SolidLine:Paired

IdleMode

5s

DottedLine:PairingFailed

Figure [8]: Key and LED Timing at pairing mode

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GWK5Nx Datasheet

13. Mounting Requirements GWK5Nx is a sensitive RF part. Need to mount them at the corner of the mother circuit board and

reserve some keep out space to the components on the mother board. Try to keep them away with metal

components like Speakers, Transformers, Batteries, Big Aluminum Capacitors, Heat Sinks and Metal

Panels.

The figure below illustrates how to mount the GWK5 module. Improper mounting will decrease the RF

performance dramatically.

Mother Board

GWK5

Keep Out Area GWK5

GWK5

GWK5

Keep out Area

Figure [9]: GWK5Nx Mounting Rule

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GWK5Nx Datasheet

14. GWK5Nx Physical Dimension

Figure [10]: GWK5Nx Dimension

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GWK5Nx Datasheet

15. Naming Rule

Gigawit Products Prefix

GW K5 N x

Wireless Audio K5 Family

N Module

RF Power VaraintO:0dBm, without PA

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GWK5Nx Datasheet

16. Ordering Information

Gigawit ID. Description

GWK5NO 0dBm RF Power module

17. Contact

捷电科技有限公司 Gigawit Electronics Limited 512 Building R2-A, Virtual University ，Science Park, Nanshan District, 518057 Shenzhen, China Tel:+86-755-86329300, Fax:+86-755-86329882 http://www.gigawit.com

18. Revision History

2011-8-22 Version 1.0, Original version

2012-9-29 Version 1.1, Subwoofer Extension Channel Support