Gigawit Electronics GWNO User Manual

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

z 5.1 Speakers
z Headphones
z Surround Speakers
z Microphones
z CD Player, DVD Player
z Stereo Audio Dongles

3. Features

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

co-existence

z Antenna diversity, forward error correction and error concealment for robust audio link
z None-compression wireless audio transmission with very low THD
z <15ms low latency, ideal for video synchronization applications
z Low Power Consumption
z 10+m RF indoor range
z 1 audio transmitter supports 4 receivers
z Dedicated 2-way logical data channel for remote control
z I2S digital audio interface supports 32 / 44.1 / 48 KHz sample rate
z Supports 2.1 Channel and 96 /192 KHz sample rate by a low-cost sample rate converter
z Power management functions for battery powered applications
z Auto muting function when suffering interference or at poor receiving conditions
z Built-in Treble/Bass, Volume, Balance Control

z Flexible design, custo m function s supported

©2008-2011 Gigawit Electronics Ltd. Version 1.0 Page 1 of 17

(Codec not Included)

4. GWK5Nx Form Factor

GWK5Nx Datasheet

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5. Electrical Specification

GWK5Nx Datasheet

General

Audio

RF

Description Typical

Operation voltage +3.3V DC
Supply current TX: 60mA RX: 60mA (GWK5NO)

TX: 69mA RX: 63mA (GWK5NQ)
Operation temperature
RF Frequency 2400 ~ 2483MHZ
Modulation GFSK
Data rate 2M bps
TX Power +0dBm (GWK5NO)

RX Sensitivity -90dBm (GWK5NO)

RF Range (indoor) 10m (GWK5NO)

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 32KHz, 44.1KHz, 48KHz
Latency Fixed 15ms or application dependent

Table [1]: Electrical Specification

-10 ~ +60℃

+10dBm (GWK5NQ)

-88dBm (GWK5NQ)

15m (GWK5NQ)

©2008-2011 Gigawit Electronics Ltd. Version 1.0 Page 3 of 17

6. GWK5Nx Pin Assignment

GWK5Nx Datasheet

Pin

#

1 GND P Ground
2 3.3V P +3.3V Power Input
3 MFB I/O Power or pairing key input, press long than 3s to turn on or

4 LED I/O Status LED output
5 MCLK O I2S Master Clock Output, NC when I2S is in slave mode
6
7
8 SCLK I/O I2S Bit Clock Input / Output
9 LRCK I/O I2S Left and Right Clock Input / Output

10 SDA

11 SCL

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

Pin name Type Description

off the module, press long than 10s to enter pairing mode.

I2SMOSI I/O I2S Data Master Output / Slave Input
I2SMISO I/O I2S Data Master Input / Slave Output

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

/STANDBY

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

/MUTE

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

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

15 GP4 I/O General purpose IO
16 GP3 I/O General purpose IO
17 GP2 I/O General purpose IO

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18 GP8 I/O General purpose IO
19 TXD I/O UART TX
20 RXD I/O UART RX

GWK5Nx Datasheet

21 RST
22 KEY I/O

23 LR2 I
24 NC NA Not Connected

I Reset input, active low

Built-in ADC for KEY
192 KHz sampling rate LRCK input

Table [2]. GWK5Nx Pin Description

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7. Application Schematic

GWK5Nx Datasheet

GWK5Nx

3.3VIN

MCLK

MOSI
MISO

SCLK

LRCK

GND
MFB

LED

SDA
SCL

GND

To MCU I2C Control

+3. 3V

R1
2K

KEY

D1

LRCK

SCLK

SDA

SCL

SDIN

T o DSP I2S Out pu t

LED

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

©2008-2011 Gigawit Electronics Ltd. Version 1.0 Page 6 of 17

NC

NC

TXD

RXD

ADCKEY

RSTN

GPIO8

GPIO2

123456789

1314151617181920212223

J1

NC

I2SMCLK

I2SLRCK

I2SSCLK

I2SSDIN

SDA

SCL

IfGWK5NxTXI2S

interfaceworkasslave

mode,usetheJ1pin19

asI2SSDIN,and

I2SMCLKremoved

123

J3

J2

1

2

RXD

TXD

TP

1

GPIO3

BLED

Shunt for ISP

R11

GPIO5

GPIO4

101112

MFB

4.7K

TP

NC

24

GWK5Nx

3.3VIN

MFB

SW1

R10

1.5K

1

TP

1

TP

1

TP

1

TP

1

TP

1

TP

1

D1

BLUE

RCH
LCH

I2SLRCK
I2SSCLK

I2SSDIN
I2SMCLK

J6

RCH

R2

470

C9

1000pF/NPO

R4

10K

C8

10uF/10V/X7R

GWK5Nx Datasheet

Line In

LCH

R5

470

C12

1000pF/NPO

10K

R6

C11

10uF/10V/X7R

C14

3.3VIN

R1

VCC33

0R

5

Vout

Vin1GND2ON/OFF

U2

+

+5V

1

2

+

D-

J5

I2SSCLK

I2SSDIN

C2

0.1uF/X7R

C4

10uF/10V/X7R

4

C6

NC

0.1uF/X7R

RT9193

3

C1

220uF

C5

0.1uF/X7R

4

5

3

_

D+

USB

+5V

1

2

J4

BAT

C7

0.1uF/X7R

VCC33

2

U3

+5V

1

DVDD

DGND

14

SDATO

MLCK

13

I2SMCLK

3

BCLK

LRCK

12

I2SLRCK

R3

4

FMT

NOHP

11

5R1

5

10

CAP

6

VA

7

RIN

VREF

LIN8AVDD9AGND

WM8738

C10

10uF/10V/X7R

10uF/10V/X7R

C13

10uF/10V/X7R

Figure [2]: GWK5Nx Interfacing with ADC

©2008-2011 Gigawit Electronics Ltd. Version 1.0 Page 7 of 17

NC

NC

123456789

1314151617181920212223

J1

SCL

ADCKEY

SDA

RSTN

I2SLRCK

RXD

I2SSCLK

TXD

DAC_EN

GPIO8

GPIO2

I2SMCLK

I2SSDOUT

GWK5Nx Datasheet

TP

1

TP

GPIO3

BLED

GPIO5

GPIO4

101112

MFB

NC

24

GWK5Nx

1

TP

1

TP

1

TP

1

TP

1

TP

1

TP

1

RCH

LCH

I2SLRCK

I2SSCLK

I2SSDOUT

I2SMCLK

J6

Line out

3.3VIN

R10

1.5K

123

J3

R1

J2

1

2

Shunt for ISP

R11

RXD

TXD

VCC33

3.3VIN

0R

5

4

NC

Vout

4.7K

C2

0.1uF/X7R

C4

10uF/10V/X7R

C3

0.1uF/X7R

MFB

SW1

D1

BLUE

LCH

C14

R3

470

R4

10K

C12

10uF/10V/X7R

C6

0.1uF/X7R

VCC33

2200pF/NPO

RCH

C16

2200pF/NPO

R5

470

R6

10K

C15

10uF/10V/X7R

Vin1GND2ON/OFF

U2

+5V

J5

RT9193

3

VA

R2

5R1

0.1uF/X7R

+5V

C8

10uF/10V/X7R

+5V

1

2

J4

BAT

C1

220uF

+

C5

2

3

1

5

4

_

+

D-

D+

USB

13

14

MCLK

LRCIN1DIN2BCKIN3ENABLE4CAP5VOUTR6GND

U4

I2SSDOUT

I2SLRCK

I2SMCLK

FORMAT

12

9

11

8

10

VDD

MUTE

DVDD

VOUTL

DEEMPH

WM8501

7

C13

I2SSCLK

DAC_EN

10uF/10V/X7R

Figure [3]: GWK5Nx Interfacing with DAC

©2008-2011 Gigawit Electronics Ltd. Version 1.0 Page 8 of 17

GWK5Nx Datasheet

8. I2S Digital Audio Interface

GWK5Nx supports 3 digital audio interface modes: Left justify mode, I2S mode and Right justify mode.

Figure [4]. Left Justify Mode

Figure [5]. I2S Mode

Figure [6]. Right Justify Mode

©2008-2011 Gigawit Electronics Ltd. Version 1.0 Page 9 of 17

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

GWK5Nx Datasheet

MCLK Output, Driving the external DSP or

Codec

BCLK Output, Driving the external DSP or

Codec

LRCK Output, Driving the external DSP or

Codec

SDIN PCM Data Input PCM Data Input
SDOUT PCM Data Output PCM Data Output

Table [3]: GWK5Nx I2S Interface

Non function, can be left open

Input, Driven by the external DSP or
Codec
Input, Driven by the external DSP or
Codec

©2008-2011 Gigawit Electronics Ltd. Version 1.0 Page 10 of 17

GWK5Nx Datasheet

9. 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

0x01:
Volume

0x02:
Treble

0x03:
Bass

0x04:
Balance

0:
Mute
1:
Power
2;
Link Status
3:
Standby
4-5:
Pairing

6-7:
Reserved
0-7 R/W 0 Volume 0dB to -48dB

0-7 R/W 0 Treble -14dB to + 14dB

0-7 R/W 0 Bass -14dB to + 14dB

0-7 R/W 0 Balance -12dB to + 12dB

R/W 0 0: Mute off

1: Mute on

R/W 1 0: Power Off

1: Power On

R 0 0: Not Linked

1: Linked

R/W 0: Standby off

1: Standby on

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

R/W 0

0x00: 0dB
0xd0: -48dB

0xf2: -14dB
0x00: 0dB
0x0e: +14dB

0xf2: -14dB
0x00: 0dB
0x0e: +14dB

0xf4: -12dB
0x00: 0dB
0x0c: +12dB

Table [4] I2C Registers

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GWK5Nx Datasheet

10. ISP Firmware Updating

GWK5Nx support ISP firmware updating through UAR T, When TXD pin connected with a 4.7K resistor to
the GND, GWK5Nx will enter the ISP mode.

Figure [7]: Gigawit ISP tool

GWK5 Module

RXD
TXD

GND

J1

Sho rt for ISP

R1

4.7K

USB to UART

TXD
RXD
GND

Figure [8]: Gigawit ISP Connection

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GWK5Nx Datasheet

11. 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.

Figure [9]: Key and LED Timing at pairing mode

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GWK5Nx Datasheet

12. 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.

Figure [10]: GWK5Nx Mounting Rule

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13. GWK5Nx Physical Dimension

GWK5Nx Datasheet

Figure [11]: GWK5Nx Dimension

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14. Naming Rule

GWK5Nx Datasheet

RF Power Varaint
O:0dBm, without PA

N Module

Wireless Audio K5 Family

Gigawit Products Prefix

©2008-2011 Gigawit Electronics Ltd. Version 1.0 Page 16 of 17

15. Ordering Information

Gigawit ID. Description

GWK5NO 0dBm RF Power module

16. 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:[phone], Fax:[phone]
http://www.gigawit.com

GWK5Nx Datasheet

17. Revision History

2011-8-22 Version 1.0, Original version

©2008-2011 Gigawit Electronics Ltd. Version 1.0 Page 17 of 17