onsemi Ayre SA3291 User manual

To learn more about onsemi™, please visit our website at
www.onsemi.com
ON Semiconductor
Is Now
onsemi and and other names, marks, and brands are registered and/or common law trademarks of Semiconductor Components Industries, LLC dba “onsemi” or its affiliates and/or
subsidiaries in the United States and/or other countries. onsemi owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of onsemi
product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent-Marking.pdf. onsemi reserves the right to make changes at any time to any products or information herein, without
notice. The information herein is provided “as-is” and onsemi makes no warranty, representation or guarantee regarding the accuracy of the information, product features, availability, functionality,
or suitability of its products for any particular purpose, nor does onsemi assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all
liability, including without limitation special, consequential or incidental damages. Buyer is responsible for its products and applications using onsemi products, including compliance with all laws,
regulations and safety requirements or standards, regardless of any support or applications information provided by onsemi. “Typical” parameters which may be provided in onsemi data sheets and/
or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application
by customer’s technical experts. onsemi does not convey any license under any of its intellectual property rights nor the rights of others. onsemi products are not designed, intended, or authorized
for use as a critical component in life support systems or any FDA Class 3 medical devices or medical devices with a same or similar classification in a foreign jurisdiction or any devices intended for
implantation in the human body. Should Buyer purchase or use onsemi products for any such unintended or unauthorized application, Buyer shall indemnify and hold onsemi and its officers, employees,
subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death
associated with such unintended or unauthorized use, even if such claim alleges that onsemi was negligent regarding the design or manufacture of the part. onsemi is an Equal Opportunity/Affirmative
Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner. Other names and brands may be claimed as the property of others.

©Semiconductor Components Industries, LLC, 2012
October, 2012 −Rev. 2
1Publication Order Number:
AND9097/D
AND9097/D
AyretSA3291 Getting
Started Guide
Introduction
Ayre SA3291 is a pre−configured wireless DSP hybrid designed for
use in hearing aids.
Ayre SA3291 is designed to work in multi-transceiver wireless
systems that can include capabilities such as streaming audio (stereo
or mono), binaural telecoil, and remote control of volume and
Memory Select (MS) between two hearing aids and a relay device.
Ayre SA3291 can also operate in a binaural system where there is no
remote control or relay device present.
This application note describes how to configure Ayre SA3291 for
use in standalone binaural systems, as well as for use in systems which
include a remote control or relay device.
Quick Start Wireless Configuration
1. Connect the device for programming using the
desired programming box connected to a PC.
2. Launch the Interactive Data Sheet (IDS).
3. Configure the wireless parameters on the Settings
tab (see section “Setting Tab Wireless
Parameters”)
4. Select the wireless or non-wireless front end mode
as required on each Memory Select tab
(see section “Memory Select Tab Wireless
Parameters”)
5. Enable or disable streaming as required on each
Memory Select using the Wireless tab
(see section “Wireless Audio Streaming”)
Near Field Magnetic Induction (NFMI) Wireless System
Overview
Ayre SA3291 utilizes NFMI to allow two or more devices
to exchange audio signals and control information.
Each device has a programmable address to distinguish
which device should be allowed to receive a particular
signal. The address consists of a Vendor ID, Network ID and
a Device ID, each of which can be programmed using IDS.
There are two basic modes of communication that the
devices use to talk to each other, with each method having
its own unique characteristics.
•Network Mode: This mode places all devices in a
network where information can be exchanged back and
forth.
The network mode is used when one hearing aid wants
to send an audio signal, such as a telephone telecoil audio
signal, to the hearing aid on the opposite ear, or when one
hearing aid wants to send a volume up or down command
to the opposite hearing aid. Network mode is primarily a
two−way mode, where devices are exchanging
information back and forth. This mode can operate only
over a small distance due to the small antennas used in the
hearing aids.
•Blast Mode: This mode is used for one−way
communications between a relay device or a remote
control, and all hearing aids within its transmission
range that have the same vendor ID and network ID.
Blast mode is primarily a one−way mode, with the blast
master streaming audio or commands to all hearing aids
within its range. Blast mode devices can operate across a
greater distance due to the larger transmit antenna and
greater transmit power.
A receiver must be configured in IDS to allow
streaming audio or remote control commands to be
received.
Ayre SA3291 Wireless System Setup using IDS
Before setting up the system using the instructions in the
following sections, Ayre SA3291 should be connected to a
programming device as shown in Figure 1 and the
Interactive Data Sheet program should start on a Windows
PC.
http://onsemi.com
APPLICATION NOTE

AND9097/D
http://onsemi.com
2
Figure 1. Wireless Configuration using IDS
Windows PC
Programming Hearing Aid
Ayre SA3291 has many programmable features and
settings that are configured using the Interactive Data Sheet
(IDS). This document only describes the functions and
settings of the wireless related parameters which are located
in the following tabs of the IDS user interface.
•Setting tab: Main wireless parameter settings
•Memory specific tabs:
♦Front end tab: Wireless front-end mode settings
specifically, binaural telecoil and mic plus binaural
telecoil.
♦Wireless tab: Streaming enable and stereo and phone
mode wireless audio level and microphone mixing
levels.
Setting Tab Wireless Parameters
The Settings tab is the first tab that is displayed when IDS
is launched (see Figure 2). The primary wireless settings are
located on this page.
Figure 2. IDS Settings Tab

AND9097/D
http://onsemi.com
3
All of the wireless parameters (see Figure 3) on the
settings tab are grouped in the lower right part of the screen.
Figure 3. IDS Settings Tab Wireless Parameters
The following parameters can be configured on the IDS
settings tab.
•DeviceID: Device Identification (left/right). This
control identifies the hearing aid as a left or a right
device. This is important as a hearing aid or relay
device uses this information to determine which hearing
aids are present. One hearing aid in a binaural system
must be programmed as left and the other hearing aid in
the system must be programmed as right.
•MSSynch: Memory Select Synchronization
(enabled/disabled). When enabled, it will allow a
hearing aid to send MS position information to the
other hearing aid. If this parameter is enabled, the
hearing aid will respond by changing its local MS
position (A, B, C, D, E, F) and then transmitting its
own MS position to the other hearing aid.
To configure both hearing aids in the system to transmit
their MS position to the far ear, both hearing aids must
have MSSynch set to enabled. If MSSynch is disabled,
when a MS is initiated, it will only change the memory
position on the local hearing aid; it will not transmit its
MS position to the far ear.
•VCSynch: Volume Control (VC) Synchronization
(enabled/disabled). When enabled, it will allow a
hearing aid to send VC level information. If this
parameter is enabled, the hearing aid will respond by
changing its local volume and then transmitting its own
VC level to the other hearing aid every time the VC is
changed.
•InterAuralDelay: Interaural Audio Delay Adjustment
(0 to 1 mS). The actual values available depend on the
sampling frequency used by the hearing aid. This
parameter adjusts the amount of delay that is introduced
between the audio in the transmitting ear and the audio
in the receiving ear. A small adjustment in this delay
may be required to create a balanced sound in a
binaural system.
For a sampling frequency of 16 kHz, a value of 0 to 16
is available, corresponding to a range of 0 to 1 ms in
0.625 mS increments.
For a sampling frequency of 32 kHz, a value of 0 to 32
is available, corresponding to a range of 0 to 1 ms in
0.313 mS increments.
•TxLevel: NFMI Transmitter Signal Level Adjustment
(4.86 V to 12.76 V). This control allows for the
adjustment of the transmitted power of the NFMI
transmitter.
Ayre SA3291 is pre−configured for optimum
transmission power at the default value, however some
increase or decrease in Tx power may be desired in certain
situations. Increasing the Tx power will increase the
wireless operating range but will also cause an increase in
power consumption which will shorten the battery life of
the hearing aid.
•VendorID: Vendor Identification Number (0 to 255).
This is a unique manufacturer’s identification number
that is assigned by ON Semiconductor to each
customer. This ID ensures that hearing aids from
different manufacturers do not interfere with each other
when in close proximity.
The VendorID available for configuration in a remote
control is equivalent to the Manufacturer’s ID that is used
to uniquely identify a manufacturer’s hearing aid. The
Manufacturer ID that has been assigned by
ON Semiconductor for your hearing aids can also be used
as your Vendor ID for the remote control, if desired.
•NetworkID: Network Identification Number (valid
entry: 0 to 65536). This ID number corresponds to the
serial number of an optional remote control, and is used
to assist with the identification between a remote
control and the hearing aids.
If a remote control device is not available at the time of
programming, a value of ‘1’ should be entered in this
field.
There is a special value that can be programmed into
this location to allow the remote control to be able to
communicate with the hearing aid. Entering a value of
‘65536’ will allow the hearing aid to always be able to
receive commands from any remote control that has been
programmed with the same Vendor ID.
•LowPowerDelay: Timeout value for no wireless audio.
This value determines how long the receiver will wait
for wireless audio to resume before going into a low
power mode.
This time out can be a value between 5 seconds and
65 seconds, with a 5 second step size.

AND9097/D
http://onsemi.com
4
Memory Select Tab Wireless Parameters
Each of the MS tabs arranged vertically along the left side
of the IDS screen have additional tabs available for
parameter programming as shown in Figure 4.
Figure 4. Memory Select A FrontEnd Tab
The front end tab in each of the MS A-D tabs contains
controls which are used to select the inputs connected to the
hearing aid, and to adjust the settings of the inputs.
The FEMode control is used to select the input, and
contains two choices for wireless inputs at the bottom of the
pick list (see Figure 5).
Figure 5. Front End Mode Wireless Settings
Binaural Telecoil
Ayre SA3291 binaural telecoil mode provides two-ear
telephone listening. In this mode, the user can adjust the VC
on the ear opposite of where the telephone is being used. If
the hearing aids are out of range for longer than the
programmable low power delay setting (see section “Setting
Tab Wireless Parameters - LowPowerDelay”), the hearing
aid will return to the previous non-wireless memory.
NOTE: Streaming by a remote control will disrupt the
binaural telecoil audio link until the streaming
ceases. For this reason, IDS will restrict users
from enabling wireless streaming when the
hearing aid is configured for binaural telecoil. It
is also important to note here that in binaural
telecoil mode, both ears will ignore MS
commands sent from the remote control.
Software Configuration Requirements
•MS Synch must be enabled on the ear configured for
binaural telecoil.
•When using an auto-telecoil (i.e. reed switch), binaural
telecoil must be configured in Memory D and DOnly
must be set to enabled on the Settings tab in IDS.
(D Only mode is reserved for binaural telecoil. This
mode cannot be used with any other front-end mode.)
•In order to be able to change the VC level from the far
ear, VC Synch must be enabled on this hearing aid.
•Inter-aural delay should be adjusted to achieve optimal
sound localization.

AND9097/D
http://onsemi.com
5
•If both left and right ears are equipped with both
telecoils and reed switches (or equivalent), then the user
can move the telephone from one ear to the other and
the system will automatically switch the audio signals
and adjust the inter-aural signal delays. The phone
switch must be completed within the programmed
auto-telecoil debounce time for the switch to happen
seamlessly. The Tcoil debounce time can be configured
on the Setting tab in IDS.
Mic plus Binaural Telecoil
Ayre SA3291 Mic plus Binaural Telecoil mode provides
two-ear telephone listening plus external audio mixed
together. In this mode, the user can adjust the VC on the ear
opposite of where the telephone is being used. As above, if
the hearing aids are out of range for longer than the
programmable low power delay setting (see section “Setting
Tab Wireless Parameters −LowPowerDelay”), the device
will return to the previous non-wireless memory.
NOTE: Streaming by a remote control will disrupt the
mic plus binaural telecoil audio link until the
streaming ceases. For this reason, IDS will
restrict users from enabling wireless streaming
when the hearing aid is configured for mic plus
binaural telecoil.
Software Configuration Requirements
Refer to Binaural Telecoil section.
NOTE: There is one additional parameter on the Front
End tab called MicAtten. This parameter allows
the user to adjust the attenuation of the
microphone signal.
Wireless Audio Streaming
Ayre SA3291 is capable of receiving wireless audio
signals and remote control commands streamed from a
remote transmitter.
To enable streaming, each hearing aid must be configured
as left or right, and the Streaming Enable checkbox should
be selected in the IDS wireless settings tab (see Figure 6).
Figure 6. Memory Select A Wireless Tab
All front-end modes with the exception of binaural
telecoil and mic plus binaural telecoil can be used with
wireless streaming.
The sliders to the left of the Streaming Enabled
checkbox allow the relative volume levels of the local mic
and the wireless signal to be adjusted.

AND9097/D
http://onsemi.com
6
Figure 7. Wireless Tab Audio Level Settings
These sliders are arranged in two groups of two sliders
each (see Figure 7), and allow the relative mixing of the
wireless signal and the local microphone for two different
types of wireless signal: Bluetooth®telephone and Stereo
Audio.
By providing separate volume adjustments for wireless
phone and wireless stereo inputs, the volume of the phone
signal can me mixed at a different level than a wireless stereo
signal.
StereoMWAtten / Stereo Watten Sliders
Figure 8. Wireless Tab Stereo Audio Level Settings
These two sliders (see Figure 8) adjust the relative
amplitude of the local microphone and the incoming
wireless streaming signal when the streaming signal is a
Stereo Audio source such as a MP3 player.
•StereoMWAtten: Adjusts the attenuation of the local
microphone from 0 dB to -24 dB and off when the
streaming signal is Stereo Audio.
•StereoWAtten: Adjusts the attenuation of the
streaming audio from 0 dB to -24 dB when the
streaming signal is Stereo Audio.
PhoneMWAtten / Phone WAtten
Figure 9. Wireless Tab Phone Audio Level Settings
These two sliders (see Figure 9) adjust the relative
amplitude of the local microphone and the incoming
wireless streaming signal when the streaming signal is a
phone source such as a Bluetooth cell phone.
•Phone MWAtten: Adjusts the attenuation of the local
microphone from 0 dB to -24 dB and off when the
streaming signal is a phone source.
•Phone WAtten: Adjusts the attenuation of the phone
source from 0 dB to -24 dB when the streaming signal
is a phone source.

AND9097/D
http://onsemi.com
7
Stereo Streaming Gain Distribution
Figure 10. Memory Select A Utilities Tab
When HRX is disabled on Ayre SA3291 device, the gain
on the front-end of the system can be adjusted using the
HRXPreGain and HRXPostAtten parameters
(see Figure 10) in combination with the Wideband Gain
parameter to get the desired gain distribution.
Please note that HRXPreGain and HRXPostAtten are
provided to give control over the preamplifier gain settings
when HRX is enabled. Normally the default values should
be used.
Ayre SA3291 Wireless System Consideration
With the configuration of the wireless parameters
properly set, the devices will perform as expected under
normal operating circumstances.
However, because these devices are based on wireless
technology, there are certain situations where the behavior
of the devices needs to be anticipated.
Streaming Reception
Streaming audio will continue to be received when the
user changes memory selects, unless the MS selected does
not have wireless streaming enabled.
Streaming audio will be received until the hearing aid
detects that wireless audio has been missing for the length
of its timeout value “LowPowerDelay”.
If the hearing aid goes out of range of the relay device but
comes back into range before the timeout has expired, it will
reconnect and resume audio output.
If the hearing aid is turned off while streaming and turned
back on, it will not resume streaming until it receives another
wireless command to initiate streaming. (This will need to
be initiated by the relay device.)
If a relay device is transmitting while binaural telecoil is
enabled, it will disrupt the ear-to-ear audio streaming. This
cannot be prevented by the hearing aid, so the relay device
and hearing aid user must manage this scenario.
Remote Control
Ayre SA3291 can receive wireless remote-control
messages from a remote control device.
Remote control functions are supported in all operating
modes with the exception of binaural telecoil modes, where
MS changes are ignored. This is to prevent a streaming audio
source from interrupting a telephone conversation.
The hearing aids will be paired with a remote control at the
time of manufacturing or fitting.
It is possible to wirelessly pair the hearing aid with a new
remote control in the event that the original device is lost or
destroyed.

AND9097/D
http://onsemi.com
8
ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC owns the rights to a number of patents, trademarks,
copyrights, trade secrets, and other intellectual property. A listing of SCILLC’s product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent−Marking.pdf. SCILLC
reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any
particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without
limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications
and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC
does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for
surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where
personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and
its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly,
any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture
of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
PUBLICATION ORDERING INFORMATION
N. American Technical Support: 800−282−9855 Toll Free
USA/Canada
Europe, Middle East and Africa Technical Support:
Phone: [phone]
Japan Customer Focus Center
Phone: 81−3−5817−1050
AND9097/D
Ayre is a trademark of Semiconductor Components Industries, LLC.
Bluetooth is a registered trademark of Bluetooth SIG, Inc.
LITERATURE FULFILLMENT:
Literature Distribution Center for ON Semiconductor
P.O. Box 5163, Denver, Colorado 80217 USA
Phone: 303−675−2175 or 800−344−3860 Toll Free USA/Canada
Fax: 303−675−2176 or 800−344−3867 Toll Free USA/Canada
Email: [email protected]
ON Semiconductor Website: www.onsemi.com
Order Literature: http://www.onsemi.com/orderlit
For additional information, please contact your local
Sales Representative