Gigawit Electronics GWNO GWK5Nx 2.4 GHz Wireless Audio Transmitter / Receiver User Manual Manual

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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 32 / 44.1 / 48 KHz sample rate
Supports 2.1 Channel and 96 /192 KHz sample rate by a low-cost sample rate converter
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
©2008-2011 Gigawit Electronics Ltd.
Version 1.0
Page 1 of 17
GWK5Nx Datasheet
4. GWK5Nx Form Factor
©2008-2011 Gigawit Electronics Ltd.
Version 1.0
Page 2 of 17
GWK5Nx Datasheet
5. Electrical Specification
Description
General
Typical
Operation voltage
+3.3V DC
Supply current
TX: 60mA RX: 60mA (GWK5NO)
TX: 69mA RX: 63mA (GWK5NQ)
Operation temperature
-10 ~ +60℃
RF Frequency
2400 ~ 2483MHZ
Modulation
GFSK
Data rate
2M bps
TX Power
+0dBm (GWK5NO)
RF
+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
32KHz, 44.1KHz, 48KHz
Latency
Fixed 15ms or application dependent
Table [1]: Electrical Specification
©2008-2011 Gigawit Electronics Ltd.
Version 1.0
Page 3 of 17
GWK5Nx Datasheet
6. GWK5Nx Pin Assignment
Pin
Pin name
Type
Description
GND
Ground
3.3V
+3.3V Power Input
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.
LED
I/O
Status LED output
MCLK
I2S Master Clock Output, NC when I2S is in slave mode
I2SMOSI
I/O
I2S Data Master Output / Slave Input
I2SMISO
I/O
I2S Data Master Input / Slave Output
SCLK
I/O
I2S Bit Clock Input / Output
LRCK
I/O
I2S Left and Right Clock Input / Output
10
SDA
I/O
/STANDBY
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.
11
SCL
I/O
/MUTE
I2C Clock or MUTE Control, firmware configurable.
When used as I2C, External 4.7K pull-up resister required.
12
GND
Ground
13
NC
NA
Not Connected
14
GP5
General purpose IO
15
GP4
I/O
General purpose IO
16
GP3
I/O
General purpose IO
17
GP2
I/O
General purpose IO
©2008-2011 Gigawit Electronics Ltd.
Version 1.0
Page 4 of 17
GWK5Nx Datasheet
18
GP8
I/O
General purpose IO
19
TXD
I/O
UART TX
20
RXD
I/O
UART RX
21
RST
Reset input, active low
22
KEY
I/O
Built-in ADC for KEY
23
LR2
192 KHz sampling rate LRCK input
24
NC
NA
Not Connected
Table [2]. GWK5Nx Pin Description
©2008-2011 Gigawit Electronics Ltd.
Version 1.0
Page 5 of 17
GWK5Nx Datasheet
7. Application Schematic
GWK5Nx
+3.3V
GND
3.3VIN
MFB
LED
MCLK
MOSI
MISO
SCLK
LRCK
SDA
SCL
GND
R1
2K
To MCU I2C Control
LRCK
SCLK
SDIN
SCL
SDA
KEY
D1
LED
To DSP I2S Output
Figure [1]: GWK5Nx Interfacing with DSP (I2S Slave Input Mode)
©2008-2011 Gigawit Electronics Ltd.
Version 1.0
Page 6 of 17
Version 1.0
VA
C1
220uF
I2SMCLK
I2SLRCK
C5
0.1uF/X7R
+5V
R3
5R1
+5V
C10
10uF/10V/X7R
BAT
J4
USB
DD+
+5V
14
13
12
11
10
WM8738
DGND
MLCK
LRCK
NOHP
AGND
AVDD
LIN
U3
C6
0.1uF/X7R
DVDD
SDATO
BCLK
FMT
CAP
VREF
RIN
RT9193
Vin
Vout
GND
ON/OFF NC
U2
C13
10uF/10V/X7R
I2SSDIN
I2SSCLK
C7
0.1uF/X7R
VCC33
C4
10uF/10V/X7R
C2
0.1uF/X7R
0R
R1
C14
10uF/10V/X7R
VCC33
3.3VIN
4.7K
R11
TXD
RXD
J2
R10
1.5K
10uF/10V/X7R
C11
D1
R6
10K
R4
10K
BLUE
SW1
MFB
If GWK5Nx TX I2S
interface work as slave
mode, use the J1 pin19
as I2SSDIN , and
I2SMCLK removed
10uF/10V/X7R
C8
Shunt for ISP
J3
3.3VIN
SCL
SDA
I2SLRCK
I2SSCLK
I2SSDIN
NC
I2SMCLK
BLED
MFB
TP
C12
1000pF/NPO
470
R5
C9
1000pF/NPO
470
R2
I2SMCLK
TP
I2SSDIN
TP
I2SSCLK
GWK5Nx
13 1
14 2
15 3
16 4
17 5
18 6
19 7
20 8
21 9
22 10
23 11
24 12
J1
TP
LCH
RCH
I2SLRCK
TP
LCH
NC
NC
ADCKEY
RSTN
RXD
TXD
GPIO8
GPIO2
GPIO3
GPIO4
GPIO5
NC
TP
RCH
TP
Line In
J6
TP
©2008-2011 Gigawit Electronics Ltd.
J5
GWK5Nx Datasheet
Figure [2]: GWK5Nx Interfacing with ADC
Page 7 of 17
Version 1.0
DD+
+5V
I2SLRCK
I2SSDOUT
I2SSCLK
DAC_EN
I2SMCLK
VA
WM8501
LRCIN
MCLK
DIN
FORMAT
BCKIN DEEMPH
ENABLE
DVDD
CAP
MUTE
VOUTR
VOUTL
GND
VDD
U4
R2
5R1
+5V
C1
220uF
C8
10uF/10V/X7R
C5
0.1uF/X7R
+5V
C13
10uF/10V/X7R
BAT
J4
USB
J5
14
13
12
11
10
RT9193
0R
C2
0.1uF/X7R
10uF/10V/X7R R6
10K
C15
470
R5
470
R3
VCC33
10uF/10V/X7R R4
10K
C12
C6
0.1uF/X7R
C4
10uF/10V/X7R
VCC33
C3
0.1uF/X7R
Vin
Vout
GND
ON/OFF NC
U2
2200pF/NPO
C16
J2
Shunt for ISP
2200pF/NPO
C14
4.7K
R11
TXD
RXD
J3
RCH
LCH
BLUE
D1
R10
1.5K
SW1
MFB
3.3VIN
Line out
J6
SCL
SDA
I2SLRCK
I2SSCLK
DAC_EN
I2SSDOUT
I2SMCLK
BLED
MFB
GWK5Nx
13 1
14 2
15 3
16 4
17 5
18 6
19 7
20 8
21 9
22 10
23 11
24 12
J1
NC
NC
ADCKEY
RSTN
RXD
TXD
GPIO8
GPIO2
GPIO3
GPIO4
GPIO5
NC
TP
3.3VIN
TP
I2SMCLK
TP
I2SSDOUT
TP
I2SSCLK
TP
I2SLRCK
TP
LCH
TP
RCH
TP
©2008-2011 Gigawit Electronics Ltd.
R1
GWK5Nx Datasheet
Figure [3]: GWK5Nx Interfacing with DAC
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 Datasheet
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
MCLK
Slave Mode
Output, Driving the external DSP or
Non function, can be left open
Codec
BCLK
Output, Driving the external DSP or
Input, Driven by the external DSP or
Codec
Codec
Output, Driving the external DSP or
Input, Driven by the external DSP or
Codec
Codec
SDIN
PCM Data Input
PCM Data Input
SDOUT
PCM Data Output
PCM Data Output
LRCK
Table [3]: GWK5Nx I2S Interface
©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
0x00:
0:
Control
Mute
1:
R/W
Reset
R/W
R/W
0: Not Linked
1: Linked
R/W
0: Standby off
Standby
4-5:
0: Power Off
1: Power On
Link Status
3:
0: Mute off
1: Mute on
Power
2;
Description
1: Standby on
R/W
Pairing
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:
R/W
R/W
Reserved
0x01:
0-7
Volume
Volume 0dB to -48dB
0x00: 0dB
0xd0: -48dB
0x02:
0-7
R/W
Treble
Treble -14dB to + 14dB
0xf2: -14dB
0x00: 0dB
0x0e: +14dB
0x03:
0-7
R/W
Bass
Bass -14dB to + 14dB
0xf2: -14dB
0x00: 0dB
0x0e: +14dB
0x04:
0-7
Balance
R/W
Balance -12dB to + 12dB
0xf4: -12dB
0x00: 0dB
0x0c: +12dB
Table [4] I2C Registers
©2008-2011 Gigawit Electronics Ltd.
Version 1.0
Page 11 of 17
GWK5Nx Datasheet
10. 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 [7]: Gigawit ISP tool
GWK5 Module
USB to UART
RXD
TXD
TXD
RXD
GND
GND
J1
Short for ISP
R1
4.7K
Figure [8]: Gigawit ISP Connection
©2008-2011 Gigawit Electronics Ltd.
Version 1.0
Page 12 of 17
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
©2008-2011 Gigawit Electronics Ltd.
Version 1.0
Page 13 of 17
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
©2008-2011 Gigawit Electronics Ltd.
Version 1.0
Page 14 of 17
GWK5Nx Datasheet
13. GWK5Nx Physical Dimension
Figure [11]: GWK5Nx Dimension
©2008-2011 Gigawit Electronics Ltd.
Version 1.0
Page 15 of 17
GWK5Nx Datasheet
14. Naming Rule
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
GWK5Nx Datasheet
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:+86-755-86329300, Fax:+86-755-86329882
http://www.gigawit.com
17. Revision History
2011-8-22
Version 1.0, Original version
©2008-2011 Gigawit Electronics Ltd.
Version 1.0
Page 17 of 17

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