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ARCHIVED BY FREESCALE SEMICONDUCTOR, INC. 2005
ARCHIVED BY FREESCALE SEMICONDUCTOR, INC. 2005
Configuration Mode (Bonding)
MOTOROLA System Operational Modes 3-5
Preliminary
If the link is lost, the user is notified by an audio indication. The headset then cleans up all internal
connection variables, and returns to the connection scan (idle) state, as if it had just been powered up.
Thus, it will be ready for any reconnect attempt from the AG.
3.8 Configuration Mode (Bonding)
From time to time, the user may want to reconfigure the headset, either to change the audio indications
volume setting, or to store a new AG address in the headset to allow the headset to connect to this AG.
Since this will happen rather infrequently, the user must put the headset in a special mode, where such
actions are allowed. This is done by pressing one of the headset buttons while powering up the headset,
depending on which AG address should be stored. If the address to be used when creating an outgoing
connection by pressing the BT button is to be stored, the BT button must be pressed while powering on the
headset. If the other AG address is to be stored, either the VOL+ or VOL- button must be pressed. The
headset LED will show that the headset is in Config. mode.
To adjust the volume of audible indications such as “low battery”, the user uses the VOL+ and VOL-
buttons (only while in Config. mode). For each press, an example indication is given, using the new
volume setting. Actually, it is the indication volume offset from the speaker level that is adjusted, since the
indications volume is always scaled proportionally to the present speaker volume.
When in Config. mode, the headset is both discoverable and connectable, just as when in Idle mode. If an
incoming connection is established, the headset replaces the selected AG address (if one has previously
been stored) with the address of the AG establishing the incoming connection. If the new AG address was
stored in the other AG slot already, this information is expired, to avoid having identical AG addresses
stored. The Config. mode is then automatically exited, indicated by the LED and audio. Thus, the user will
be able to tell when the address has been successfully stored.
If the AG initiates authentication while creating the connection (Security Mode 3—link level security) in
order to bond the two units together
5
, the headset acts as required by the Bluetooth specification during the
authentication. In order to complete this procedure, the AG must know the PIN code of the headset. This
PIN is programmed at production time and stored in non-volatile memory, and is stated in the
documentation (typically '0000'). After completing this process, both units will have derived matching
Common Link Keys, and the headset will store this key for use when connecting to and accepting
incoming connections from the AG in question. The headset user will not be able to tell from the headset
whether authentication took place since this information is irrelevant to him.
The headset will still accept connections from any AG (or other Bluetooth units), even if bonded to one or
two specific units. The bonding only satisfies the AG’s desire to certify that the headset to which it
connects is (beyond any reasonable doubt) the headset to which it was originally bonded, and to allow the
headset to establish an outgoing connection.
If the user wants to exit the Config. Mode without updating the AG information, he can press the BT
button briefly. The headset then returns to Idle mode. In this case, any previously stored AG address
information is left unchanged, while any audio indication volume change is maintained. Also, the headset
automatically exits Config. mode after three minutes.
Finally, the user may press and hold the BT button to delete all AG information and reset the speaker and
indication volume settings to factory defaults. This procedure will be indicated by an audio indication and
LED flash sequence. The headset remains in Config. mode, ready for pairing a new AG.
5. Bonding two Bluetooth units together (or pairing them) is a way of ensuring that not even an imposter unit trying to pass itself off as the AG
to which the headset is bonded, can connect to the headset, since it will not know the Link Key previously agreed upon by both the headset
and the AG which it tries to replace.
Freescale Semiconductor, I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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