Airoha AB1561 Guide

AB1561 Headset Reference Design
User Guide
Version: 1.0.1
Release date: 23 July 2020
© 2020 Airoha Technology Corp.
This document contains information that is proprietary to Airoha Technology Corp. (“Airoha”) and/or its licensor(s). Airoha cannot grant you
permission for any material that is owned by third parties. You may only use or reproduce this document if you have agreed to and been
bound by the applicable license agreement with Airoha (“License Agreement”) and been granted explicit permission within the License
Agreement (“Permitted User”). If you are not a Permitted User, please cease any access or use of this document immediately. Any
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CLAIMS RELATING TO OR ARISING OUT OF THIS DOCUMENT OR ANY USE OR INABILITY TO USE THEREOF. Specifications contained herein are
subject to change without notice.

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Document revision history
Revision Date Description
1.0.0 01 May 2020 Initial version
1.0.1 23 July 2020 Modify content for specific model

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Table of contents
1. Introduction........................................................................................................................................... 1
1.1. Platform architecture .........................................................................................................................1
1.2. EVK components.................................................................................................................................1
2. MMI Functionality ................................................................................................................................. 3
2.1. System ................................................................................................................................................3
2.1.1. Power................................................................................................................................3
2.1.2. Reset to factory ................................................................................................................3
2.1.3. Language selection ...........................................................................................................4
2.1.4. ANC ...................................................................................................................................4
2.1.5. AiroThru............................................................................................................................4
2.1.6. Google Fast Pair ................................................................................................................4
2.2. Connection..........................................................................................................................................5
2.2.1. Enter pairing mode ...........................................................................................................5
2.2.2. Reconnect while power on ...............................................................................................5
2.2.3. Reconnect actively............................................................................................................6
2.2.4. Call off connection ............................................................................................................6
2.2.5. Voice recognition..............................................................................................................6
2.3. Calling .................................................................................................................................................6
2.3.1. Accept call.........................................................................................................................7
2.3.2. End call..............................................................................................................................7
2.3.3. Last number redial............................................................................................................7
2.3.4. Cancel outgoing call..........................................................................................................7
2.3.5. Reject call..........................................................................................................................7
2.3.6. Hold call ............................................................................................................................8
2.3.7. Three-way calling..............................................................................................................8
2.4. Volume ...............................................................................................................................................9
2.4.1. Speaker volume ................................................................................................................9
2.4.2. Mic mute...........................................................................................................................9
2.5. Music ..................................................................................................................................................9
2.5.1. Music play.......................................................................................................................10
2.5.2. Music pause ....................................................................................................................10
2.5.3. Music forward.................................................................................................................10
2.5.4. Music backward ..............................................................................................................10
3. MMI Event............................................................................................................................................12
3.1. Connection........................................................................................................................................12
3.2. Battery ..............................................................................................................................................12
3.3. Time out............................................................................................................................................12
4. Key Mapping Table ...............................................................................................................................13

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Lists of tables and figures
Table 1. Power ........................................................................................................................................................3
Table 2. Reset to factory .........................................................................................................................................3
Table 3. Language selection ....................................................................................................................................4
Table 4. ANC............................................................................................................................................................4
Table 5. AiroThru.....................................................................................................................................................4
Table 6. GAP ............................................................................................................................................................5
Table 7. Enter pairing mode....................................................................................................................................5
Table 8. Reconnect while power on........................................................................................................................5
Table 9. Reconnect actively ....................................................................................................................................6
Table 10. Call off connection...................................................................................................................................6
Table 11. Voice recognition ....................................................................................................................................6
Table 12. Accept call ...............................................................................................................................................7
Table 13. End call ....................................................................................................................................................7
Table 14. Last number redial...................................................................................................................................7
Table 15. Cancel outgoing call.................................................................................................................................7
Table 16. Reject call ................................................................................................................................................7
Table 17. Hold call...................................................................................................................................................8
Table 18. Reject and accept ....................................................................................................................................8
Table 19. Hold and reject ........................................................................................................................................8
Table 20. Hold and accept.......................................................................................................................................8
Table 21. Add call ....................................................................................................................................................9
Table 22. Speaker volume.......................................................................................................................................9
Table 23. Mic mute .................................................................................................................................................9
Table 24. Music play .............................................................................................................................................10
Table 25. Music pause...........................................................................................................................................10
Table 26. Music forward .......................................................................................................................................10
Table 27. Music backward.....................................................................................................................................10
Table 28. Connection event ..................................................................................................................................12
Table 29. Battery event.........................................................................................................................................12
Table 30. Time out event ......................................................................................................................................12
Table 31. Key mapping table.................................................................................................................................13
Figure 1. Software architecture ..............................................................................................................................1
Figure 2. EVK components ......................................................................................................................................2

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1. Introduction
The man-machine interface (MMI) layer is intended to offer a well-organized interface that makes control profile
services such as HFP, A2DP, and AVRCP more intuitive. The MMI layer also provides a robust system environment
which protects users from a negative experience (e.g., crash situation).
This guide is written to help users easily and completely understand MMI layer functionality.
1.1. Platform architecture
Figure 1. Software architecture shows that the software architecture is made up of several components which are
also divided into three different groups: Airoha Defined Interface component; Bluetooth Defined Component; and
Customer Defined Component. MMI is the only component in the Customer Defined component. It is also the
topmost layer and is completely controlled by users. Moreover, MMI coordinates the interface and allows all
profiles to operate together.
AVRCP
Hardware
LC
LM
HCI Middleware
L2CAP
RFCOMM
SDP
MMI
Profile Manager
Data Center
SDAP SPP
Host
Controller
Applications
Middle Profiles
Airoha Defined Interface Component
Bluetooth Defind Component
Customer Defind Component
{
{ AVDTP
GAVDP AVCTP GAP ATT SM
A2DPHandsfree
Headset
GATT
BLE Profiles
Figure 1. Software architecture
1.2. EVK components
When users start using the MMI functionality, there are some signals they can recognize to verify whether the
corresponding functionality is correctly operating. Besides, users must use some EVK components to also make use
of the MMI functionalities. Therefore, this section introduces those components that are used to trigger MMI or
show the MMI functionality.
There are four different colors to indicate the different EVK component groups as shown in Figure 2. EVK
components.

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1) The EVK components shown in red indicate the buttons on the EVK. From left to right, these buttons are
Regen, PIO2, PIO3, PIO4, PIO5, PIO7 and PIO8.
2) The EVK components shown in green indicate the LEDs. The LEDs are shown from left to right as LED0 and
LED1. These LEDs have different colors.
3) The EVK component shown in yellow is the earphone jack. The earphone jack is used for listening to the
voice prompt and ringtone that are related to a specific MMI functionality.
Figure 2. EVK components

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2. MMI Functionality
This section shows the MMI layer functionality. Generally speaking, MMI functions can be partitioned into five
main fields: system; connection; calling; volume; and music. A more in-depth description of each function fields is
given in the function field sections.
Furthermore, the actions for the buttons must be defined in advance. The tap action is defined as a press of the
button of no more than 700 milliseconds. Pressing the button for more than 700 milliseconds is defined as a
“press”.
The beep results must also be well defined. The length of the beeps are described as long, median, and short, and
the beep’s tonality refers to the falling and rising sounds. Every beep result includes a number which describes the
number of times a beep will play.
In the following sections, the components must be used to trigger the functionality. The results indicate that the
functionality is correctly triggered.
2.1. System
Regarding the system function field, the MMI functionalities related to the functions of the EVK itself are classified
in this field, including how to turn on and off the Airoha product, Active Noise Cancellation (ANC), AiroThru, and
how to reset the device to factory settings.
2.1.1. Power
The user can turn the Airoha product on and off.
Table 1. Power
Functionality Actions Results Requirements
Power on Press key1 (Regen) for three seconds
LED0 rapidly flashes three
times
One long beep and the voice
prompt says “Power On”
Power off state
Power off Press key1 (Regen) for three seconds
LED1 rapidly flashes three
times
One long beep and the voice
prompt says “Power Off”
Any state except for
power off, or when
detaching a link or
the EEPROM is
updating
2.1.2. Reset to factory
The user to recover the original Airoha product settings, such as the device name. Only valid after power off.
(Clean paired history, reset volume level, language, device name and PEQ to default setting.)
Table 2. Reset to factory
Functionality Actions Results Requirements

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Functionality Actions Results Requirements
Reset to factory
Tap key1 (Regen) -> wait 1 sec ->
press key1 (Regen) + key3(PIO5)
One median beep
In the power off
state.
2.1.3. Language selection
The user could change the language of the system.
Table 3. Language selection
Functionality Actions Results Requirements
Change the
language of the
system
Double-tap key3 (PIO5)
Double long beep and a voice
prompt says “English voice
prompt”
System is active
2.1.4. ANC
Ambient unwanted sound is significantly reduced when ANC is on. ANC uses aural overlap and destructive
interference to attenuate surrounding noises.
Table 4. ANC
Functionality Actions Results Requirements
ANC on
Triple-tap key5 (PIO4)
Two falling beeps
In power on, during
pairing mode,
connected, call active
states
ANC off
Triple-tap key5 (PIO4)
Two falling beeps
In power on, during
pairing mode,
connected, call active
states
2.1.5. AiroThru
When the AiroThru functionality is on, the user can hear the surrounding sound without removing their
headphones. Essentially, users can still hear traffic, broadcasts, or chatting when they are listening to music or
audio.
Table 5. AiroThru
Functionality Actions Results Requirements
AiroThru on
Press key7 (PIO3) for three seconds
Rising beeps
In power on, paring
mode, connected
states
AiroThru off
Press key7 (PIO3) for three seconds
Rising beeps
In power on, paring
mode, connected
states
2.1.6. Google Fast Pair

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The Airoha device supports Google Fast Pair Service (GFPS) as a fast pair provider to allow fast pair seekers to find
the device through a specific BLE advertisement that contains the model ID for the registered fast pair device.
Please refer to the following link for more information about Google Fast Pair:
https://developers.google.com/nearby/fast-pair/spec.
Note: The model ID and anti-spoofing key pair in the official release firmware are for testing purposes only. For
information about registering your device and getting the relevant Model ID and Anti-Spoofing keys, see the
following link: https://developers.google.com/nearby/devices/.
Table 6. GAP
Functionality Actions Results Requirements
Fast pair
Turn on device which
has the GFPS feature
enabled. The device
goes into a discoverable
state.
Android phones near
the device show a
notification with the
model image. Tap
the notification to
pair with the device.
Android 6.0 or later.
Network access is mandatory (e.g., 3G, 4G,
Wi-Fi).
2.2. Connection
This section describes the MMI functionality related to being discoverable by other devices, connecting to other
devices, cancelling the connection with other devices, and turning on the voice assistant on the device that is
connecting to the Airoha product.
2.2.1. Enter pairing mode
This functionality is used to make the Airoha product discoverable by other devices.
Table 7. Enter pairing mode
Functionality Actions Results Requirements
Enter pairing
mode
Press key3(PIO5) for two seconds
One long beep and the voice
prompt says “Pairing”
Power off state
Note: The six second action includes the power on procedure. To be more specific, after pressing key1 (Regen) for
three seconds, the user will first see the power on result. The user must continue pressing the key1 (Regen) for
another three seconds to complete the six second action.
2.2.2. Reconnect while power on
During the power on procedure, the user makes the Airoha product connect to another device previously
connected to the Airoha product.
Table 8. Reconnect while power on
Functionality Actions Results Requirements

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Functionality Actions Results Requirements
Reconnect while
power on
Press key1 (Regen) until you hear
“Power-On” and release immediately
Four rising beeps, and a voice
prompt says "Connected"
Power off state
Note: The voice prompt immediately says “Connected” when the Airoha product successfully connects to the
other device.
2.2.3. Reconnect actively
The user makes the Airoha product connect to another device previously connected to the Airoha product.
Table 9. Reconnect actively
Functionality Actions Results Requirements
Reconnect
actively
Tap key1 (Regen)
One short beep
In power on, pairing
mode, connected
states
Note: The voice prompt immediately says “Connected” when the Airoha product successfully connects to the
other device.
2.2.4. Call off connection
The user makes the Airoha product disconnect from another device.
Table 10. Call off connection
Functionality Actions Results Requirements
Call off
connection
Triple-tap key7 (PIO3)
Rising beeps, and a voice
prompt says "Disconnected"
In connected,
incoming/outgoing
call, call active states
Note: If the Airoha product successfully cancels the connection, the user immediately hears four falling beeps and
the voice prompt say “Disconnected”.
2.2.5. Voice recognition
The user turns on the voice assistant on the device connected to the Airoha product.
Table 11. Voice recognition
Functionality Actions Results Requirements
Voice
recognition
Triple-tap key1 (Regen)
One median beep
In connected states
2.3. Calling

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This section shows the MMI functionality related to calling. These functions include how to accept/end/reject/hold
a call, cancel an outgoing call, redial the most recently dialed phone number, transfer the sound to a connected
device or to the Airoha product, and manage a three-way call.
2.3.1. Accept call
The user can accept an incoming call.
Table 12. Accept call
Functionality Actions Results Requirements
Accept call
Tap key1 (Regen)
One median beep
An incoming call is
active
Note: When the call is successfully accepted, LED1 periodically flashes for two seconds.
2.3.2. End call
The users can end an active call.
Table 13. End call
Functionality Actions Results Requirements
End call
Tap key1 (Regen)
One median beep, four
falling beeps, and the voice
prompt says “Call ended”
A call is active
2.3.3. Last number redial
The user can redial the most recently dialed number.
Table 14. Last number redial
Functionality Actions Results Requirements
Last number
redial
Double-tap key1 (Regen)
One long beep and a voice
prompt says “Redialing”
In connected states
2.3.4. Cancel outgoing call
The user can cancel an outgoing call.
Table 15. Cancel outgoing call
Functionality Actions Results Requirements
Cancel outgoing
call
Tap key1 (Regen)
One long beep and a voice
prompt says “Call cancelled”
An outgoing call is
active
2.3.5. Reject call
The user can reject an incoming call.
Table 16. Reject call

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Functionality Actions Results Requirements
Reject call
Double-tap key1 (Regen)
One long beep and a voice
prompt says “Call rejected”
A call is incoming
2.3.6. Hold call
The user can hold an active call.
Table 17. Hold call
Functionality Actions Results Requirements
Hold call
Double-tap key1 (Regen)
NA
A call is active
2.3.7. Three-way calling
This section shows the functions available to users when two calls are active at the same time.
Note: The calls here are held, incoming, or active.
2.3.7.1. Reject and accept
The user can cancel the currently active call and accept a held or incoming call.
Table 18. Reject and accept
Functionality Actions Results Requirements
Reject and
accept
Tap key5 (PIO4)
One long beep
Another incoming or
active call
2.3.7.2. Hold and reject
The user can keep the current call and reject a held or incoming call.
Table 19. Hold and reject
Functionality Actions Results Requirements
Hold and reject
Press key6 (PIO2) for two seconds
One long beep
Another incoming or
active call
2.3.7.3. Hold and accept
The user can hold the current calling and accept an incoming call.
Table 20. Hold and accept
Functionality Actions Results Requirements
Hold and accept
Tap key7 (PIO3)
One long beep
Another incoming or
active call

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2.3.7.4. Add call
The user can add the held call to the current calling.
Table 21. Add call
Functionality Actions Results Requirements
Add call
Double-tap key7 (PIO3)
One long beep
Another incoming or
active call
2.4. Volume
This section shows the MMI functions related increasing or decreasing the volume of the speaker and microphone,
and how to mute or unmute the microphone.
2.4.1. Speaker volume
Users can adjust the sound level of the speaker.
Table 22. Speaker volume
Functionality Actions Results Requirements
Speaker volume
up
Continuously press key5 (PIO4) One short beep In connected,
incoming/outgoing,
call active states
Speaker volume
down
Continuously press key6 (PIO2)
One short beep
In connected,
incoming/outgoing,
call active states
Note: The speaker here is applicable to HFP, A2DP, depending on the scenario.
Note: When the volume reaches the maximum level, the user hears two short beeps and the voice prompt says
“Volume maximum” through the earphone.
2.4.2. Mic mute
The user can mute or unmute the microphone.
Table 23. Mic mute
Functionality Actions Results Requirements
Mic mute toggle Double-tap key3 (PIO5) Two short beeps and the
voice prompt says “Mute
on/off”
Only during an active
call
Note: When the microphone is muted, the voice prompt says “Mute on” and will periodically repeat saying “Mute
on” until the microphone is unmuted.
2.5. Music

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This section shows the MMI functionality for music control, including the method for playing music, pausing music,
and setting music forward or backward.
Note: The music referred to here is for both A2DP.
Note: A2DP music cannot exist at the same time.
2.5.1. Music play
The user can play music.
Table 24. Music play
Functionality Actions Results Requirements
Music play
Tap key3 (PIO5)
NA
In connected states
Note: The user can immediately hear the song from earphones when the music successfully plays.
2.5.2. Music pause
The user can pause the currently playing music.
Table 25. Music pause
Functionality Actions Results Requirements
Music pause
Tap key3 (PIO5)
NA
In connected states
Note: The user immediately hears the music pause when the music successfully pauses.
2.5.3. Music forward
This functionality provides the ability to play the next audio file.
Table 26. Music forward
Functionality Actions Results Requirements
Music forward
Double-tap key5 (PIO4)
One short beep
In connected states
2.5.4. Music backward
The user can play the audio file that is stored before the currently playing audio file.
Table 27. Music backward
Functionality Actions Results Requirements

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Functionality Actions Results Requirements
Music backward
Double-tap key6 (PIO2)
One short beep
In connected states

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3. MMI Event
This section shows the events that are not triggered by pressing the button, but are instead triggered by other
devices or the Airoha product itself. These events are divided into three types: connection, battery, and time out.
3.1. Connection
This section shows all events related to connections, such as successfully pairing, being connectable and being
connected.
Table 28. Connection event
Event Results
Pairing successfully LED0 rapidly flashes five times
Connectable LED1 flashes every 2.06 seconds (light-on 0.06s, light-off 2s)
Connected LED1 flashes every 5.46 seconds (light-on 0.06s, light-off 5.4s)
Discoverable LED1 flashes every 1 seconds (light-on 0.5s, light-off 0.5s)
Note: If the Airoha product is connectable, it can only be connected to but it is not discovered.
Note: The connected event here is for situations in which it is both fully connected and not connected.
3.2. Battery
This section shows the battery events including low battery and charging.
Table 29. Battery event
Event Results
Low battery LED0 periodically flashes for two seconds
Charging LED0is always on during charging
3.3. Time out
There are three different time out mechanisms for the Airoha product: connectable time out; pairing mode time
out; and auto power off. This section shows each of these time out mechanisms.
Table 30. Time out event
Event Results
Connectable time out Connectable state is disabled after 10 minutes
Pairing mode time out The pairing mode times out after 5 minutes when the Airoha product is not connected or
discoverable state is removed
Auto power off The Airoha product turns off after 30 minutes of inactivity

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4. Key Mapping Table
This section shows a mapping table of the keys, actions, LEDs, voice prompts, ring tones and any related comments for a specific function. For example, for the ‘Power on’ function, search
for ‘Power on’ in the ‘Functionality’ column in Table 31. Key mapping table. The Key, Action, LED, Voice prompt, Ring tone, and comments that are associated with the ‘Power on’ function
(i.e. Regen; Press for three seconds; LED1 rapidly flashes three times; Say “Power-On”; One long beep; and ‘In the power off state’) are shown in the adjacent cells on the same row.
Table 31. Key mapping table
Key Functionality Action LED Voice prompt Ring tone Comment
key1 (Regen) Power on Press for three seconds LED0 rapidly flashes
three times
Say “Power-On” One long beep In the power off state
Reconnect while
power on
Press until you hear “Power-On”
and release immediately
NA Say “Connected” One median beep
and four rising beeps
In the power off state
Last number redial Double-tap NA Say “Redialing” One long beep In the connected state
Power off Press for three seconds LED1 rapidly flashes
three times
Say “Power-Off” One long beep Any state except for power off, or when
detaching a link, or the EEPROM is
updating
Accept call Tap NA NA One median beep An incoming call is active
End call Tap NA Say “Call ended” One median beep
and four falling beeps
A call is active
Reconnect actively Tap NA NA One short beep In the power on, pairing mode, or
connected states
Cancel outgoing call Tap NA Say “Call cancelled” One long beep An outgoing call is active
Reject call Double-tap NA Say “Call rejected” One long beep An incoming call is active
Voice recognition Triple-tap NA NA One short beep In the connected state
Hold call Double-tap NA NA NA A call is active
key3 (PIO5) Music play Tap NA NA NA Cannot control BT in the MP3 state
Music pause Tap NA NA NA Cannot control BT in the MP3 state

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Key Functionality Action LED Voice prompt Ring tone Comment
Mic mute toggle Double-tap NA Say “Mute on/off” Two short beeps Only during an active call
Enter pairing mode Press for two seconds NA Say “Pairing” One median beep In the power off state
Language Selection Double-Tap NA Say “English Voice
Prompt/中文語音
提示”
NA Valid in standby mode.
key1 (Regen)+
key3(PIO5)
Reset to factory Tap key1 (Regen) -> wait 1 sec ->
press key1 (Regen) + key3(PIO5)
NA NA One median beep Only valid after power off. (Clean paired
history, reset volume level, language,
device name and PEQ to default
setting.)
key5 (PIO4) Speaker volume up Continuously press NA NA One short beep In the connected, incoming/outgoing,
or call active states
Music forward Double-tap NA NA One short beep Cannot control BT in the MP3 state
Reject and accept Tap NA NA One long beep Another incoming or active call exists
ANC On/Off Triple-Tap NA NA Two falling beeps
key6 (PIO2) Speaker volume
down
Continuously press NA NA One short beep In the connected, incoming/outgoing,
or call active states
Music backward Double-tap NA NA One short beep Cannot control BT in the MP3 state
Hold and reject Tap NA NA One long beep Another incoming or active call exists
key7 (PIO3) Call off connection Triple-tap NA Say “Disconnected” One median beep In the connected, incoming/outgoing
call, or call active states
Hold and accept Tap NA NA One short beep 1. Another incoming or active call exists
2. Tap again to switch calls
Add call Double-tap NA NA One short beep Another incoming or active call exists
AiroThru Press for three seconds NA NA One short beep All states except for call active state