Wet Sounds A-Link Mk2 User manual

Wet Sounds A-Link Mk2
Preliminary ID concepts provided by Wet Sounds
Eleven Engineering Inc.
072519
Note: no metal parts
allowed in top half of
product (the antenna
region)

Wet Sounds A-Link Mk2
Mech Overview
Eleven Engineering Inc.
072519
Front View Side View
150 mm
Motherboard and FE
antenna (FE Antenna
in upper section)
Strain Relief and
pigtail cable
Membrane Keypad
(4 Buttons and 2
LEDs)
LiPo Flat Pack
battery located here
Windshield mount
clip points (4)
All components (except for
UI components) mounted
on this side of motherboard
SKAA
compatible
badge on
back panel
No metal parts
allowed in top half
of product (the
antenna region)
19 mm28 mm

Wet Sounds A-Link Mk2
Motherboard PCB footprint and Batt dimensions
Eleven Engineering Inc.
072519
130.0 mm
PCB is 1.6 mm
thick
24.0 mm
Components top
side, buttons and
LEDs bottom
side
65.0 mm
Batt is 8 mm
thick
24.0 mm

Wet Sounds A-Link Mk2
Windshield mount and pigtail detail
Eleven Engineering Inc.
072519
Boat
Windshield
Suction cup
windshield
mount
IN - 3.5 mm Stereo male plug
OUT - 3.5 mm Stereo female jack
Power - Micro USB female jack
1 meter
cable length (before split point)
Cable Split point
Are clips
required to
fasten the
cable ?
Dashboard

4 Buttons
In membrane
keyboard
3 LEDs - light pipes with domes
which protrude up and out of the
enclosure wall and are heavily
frosted — key point is to get the
LED light up and out of the
enclosure so it’s more visible in
bright sunlight.
Membrane
button panel is
sealed and water
proof
Notes
•Buttons have a “clicky” , responsive tactile feel
(to enable multi-click commands)
•Membrane is UV stable, sealed and water proof
•LED light pipes are embedded in enclosure
wall adjacent to membrane keypad — these
light pipes do not run through the membrane
itself
Wet Sounds A-Link Mk2
Keypad UI configuration
Eleven Engineering Inc.
072519
SKAA Indicator
LED (multi-color)
Power LED
RED = transmit
GREEN = receive
DIM = VO/sleep
OFF = off
Bond Button with
Bond Icon (see next
page for functions)
Batt LED (orange)
FLASH = low batt
SOLID = charging
OFF = other
Power Button
HOLD = on/off
CLICK = Tx / Rx mode change
Volume up/down buttons
SKAA Icon near UI panel — can be subtle
for example gloss black on matte black

SKAA Bond Button / SKAA Indicator
Standard Definition
Eleven Engineering Inc.
021418

Wet Sounds A-Link Mk2
Eleven Engineering Inc.
Signal Block Diagram
072519
R G
FE Antenna
Vertical
orientation
Ginseng
SKAA
Indicator
3-color
+/-
Volume
Buttons
Bond
Button
I2S
Power
LED
I2C
I2S
Analog
Stereo Input Analog
Stereo Out
ADC
DAC Amp
Power
Down
Prep
Soft
Power
Batt
Volts
ADC
hVOL bVTR
X
=
80% 50% 40%
How SKAA Volume Works
hVOL is “Global” volume which
mirrors the host device volume
whenever possible. It is maintained
and stored in the SKAA transmitter.
bVTR is “Local” volume
which is stored in the SKAA
Receiver. The +/- volume
buttons always affect bVTR.
nVOL is transformed through a volume table
(customizable) residing inside the Ginseng and
the resulting value is sent out to the DAC via
I2C as a hardware volume control command
I2C volume
command to
DAC
3.5 mm TRS
plug
3.5 mm
TRS jack
bVTR
Standby Low
Batt
R G
Notes
•The BATT LED is shown on the power
block page
•The POWER BUTTON is shown on the
power block page
Bridge
Ground
nVOL
MUX
Gnd
Loop
Sense
Select

Source DC Bus
~3.7 VDC
Switching
Regulator
Power
button
Wet Sounds A-Link Mk2
Eleven Engineering Inc.
Power Block Diagram
072519 +3.3V DC Bus
†Power
Down
Prep
enable
FET
Digital
Ground
Analog
Ground
3.7 V Li-Po
Battery Pack
5VDC
Orange
Charge
IC
includes
Hi/Lo V
protect
Micro
USB Jack
3.3V to
motherboard
†Low
BATT
† Bridge
Ground
†Soft!
Power
† Gnd Loop
Sense
BATT
LED
Notes
•Signals marked with † connect to
the Signal Block page
•Ground Loop detection/smart
splitting of grounds (for hum/buzz
avoidance) happens only at power
up and when mode (Tx/Rx) is
toggled
•The unit is configured to be able to
operate in either Tx or Rx mode
while charging
•Some users may opt to keep their
units connected to 5V power at all
times — this mode of operation is
supported
†BATT!
Volts

Standby
Chip:
Ginseng
ADC
DAC
SKAA
Indicator
Power LED
ON Tx
√
√
-
-
Bright Red
VO
RF off
√
-
-
Dim Red
ON Rx
√
-
√
√
Bright Green
Standby
√
-
-
√
Bright Green
Sleep
RF 33%
duty cycle
-
-
-
Dim Green
OFF
-
-
-
-
-
Chip Power
ON!
Rx
Tx mode (Batt Power) Rx mode (Batt Power)
10 min
after loss
of Bond
20 min after
entering
Standby
•in Standby state,
Ginseng shuts off the
ADC, DAC and
buffers
•“Sleep” is a power
saving state for
SKAA receivers.
Sleep is triggered by
a loss of Bond.
•In Sleep state, the
SKAA receiver
improves on the
power saving
performance of
Standby state by
also duty cycling the
SKAA radio. You can
tell the unit has gone
to sleep when the
SKAA indicator shuts
off and the Power
LED dims
•Powering off certain
chips will be effected
by holding them in
RESET
•ON/OFF is achieved
by a press & hold of
the Power Button by
the user (this
transition is not
shown in these
power state
diagrams)
Bond
Restored
or User
clicks any
button
VO
OFF
ON
Tx
2.5 min
after
Silence
Detected
20 min after
entering VO
Audio
Detected
or User
clicks any
button
OFF
LOW
BATT
LOW
BATT
Wet Sounds A-Link Mk2
Eleven Engineering Inc.
Power States
072519
Rx mode (External Power)
60 min after
entering
Standby
Sleep
Notes
•“VO” means Virtual Off —this is a power saving
state for SKAA transmitters, triggered by lack
of audio (silence).
•In VO state, Ginseng’s RF section is shut off
causing all Bonds to drop (all Bonded SKAA
receivers are dropped)
•“Standby” is a power saving state for SKAA
receivers.
Tx mode (External Power)
VO
ON!
Tx
2.5 min
after
Silence
Detected
Audio
Detected
or User
clicks any
button
Bond
Restored or
User clicks any
button
Bond
Restored
or User
clicks any
button
10 min
after loss
of Bond
ON!
Rx
Standby

Li-Po Battery
Capacity 1 cell (mAh)
600
Nominal Volts 1 cell
3.7
Energy 1 cell (mWh)
2220
Qty Cells in Pack
1
Energy in Pack (mWh)
2220
Reg. Efficiency (%)
90%
Available Energy (mWh)
1998
Operational Mode
Transmit
Receive
Ginseng SiP (mW)
220
150
ADC (mW)
30.5
DAC Amp (mW)
60
Other (mW)
30
30
Whole Product (mW)
280.5
240
Est. Run Time (hours)
7.1
8.3
Supply
Demand
Notes
•Dimensions of the LiPo flat pack
battery are shown in mech detail slide
early in this document
Wet Sounds A-Link Mk2
Battery Life Calculation
Eleven Engineering Inc.
072519

Component
Mk2
Ginseng
6.50
ADC
1.05
DAC
0.45
Batt Charge Chip
0.75
PCB
1.00
3.3 V Regulator
0.50
LiPo Battery
2.50
Buttons and LEDs
0.35
Pigtail cable, SR, Y & connectors
1.50
FE Antenna
0.50
Enclosure
1.50
Windshield Clip / Mounting Clip
0.70
Other Electrical
1.75
Other Mechanical
1.00
Total
20.05
BOM
SKU
Cost
Mk2 2-pack
40.10
Packaging & Manual
1.30
LOP at 18%
7.45
Total (manufactured 2-pack)
48.85
Manufacturing / Testing
Notes
1. All figures are USD
2. Costs are estimates only
3. Charging Adapters and cables are not included (we assume the user has plenty of those already)
4. Allocations for master carton are not included
Wet Sounds A-Link Mk2
Per Unit Budget
Eleven Engineering Inc.
072519

Parameter
Spec Value
Input full scale
1.0 VRMS
Input impedance
10 k ohms
Output full scale
1.0 VRMS
Minimum load required at output
1k ohms
Frequency Range
20 Hz - 20 kHz
THD
< 0.03%
SNR
≥88 dB A-weighted
Audio channels
2
Digital Resolution
16 bits x 48 kHz
Max receivers per transmitter
4
Latency
36 ms
SKAA Pro mode (2 receivers, 18 ms)
Yes - Rx mode only
Wet Sounds A-Link Mk2
Audio Specs
Eleven Engineering Inc.
112019