The connector comprises the following pins, Detection, Acc power – Sony CMD-CD18 User Manual
Page 7: Rx and tx, Audio in and audio out, Audio in, Audio out
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The connector comprises the following pins:
Detection:
The detection of accessory is done by the charge pin and the detect pin.
Any accessory with an active charge will wake up the phone.
The
insertion
and
removal
of
the
charger
(Cigar
Lighter
Charger,
Desktop-Charger,
AC-Charger)
is
detected
via
polling. To reduce the power consumption the polling can take up to 5 sec.
The
insertion
and
removal
of
other
accessory
is
detected
via
an
Interrupt.
This
detection
is
only
possible
when
the
phone is powered up.
ID:
The ID pin indicates what kind of accessory is connected.
ACC power:
ACC-power
has
different
functionality
with
different
accessories.
ACC-power
supplies
power
to
the
headset
(min.2.7V and min. 10 mA) or will be used as a signaling pin for the Hands Free Kit.
In
the
car-kit environment the ext. Vbat indicates that a phone call is accepted/in progress. This information is used
by the car-kit to power up the audio section of the car-kit, mute the car stereo and keep the car-kit powered up
even when the ignition is switched off.
Due to the fact that the ID of the accessory is detected first, the ACC power is not current limited (protected).
RX and TX:
This is the communication interface to the PCMCIA card “QN-2PCM” or the PC-link cable ’’QN-2EC”.
Audio In and Audio Out
These pins build the audio interface to the Head-Set and the Hands Free Kit.
Audio IN:
To
limit
the
noise
which
is
coupled
on
the
Mic-line,
the
Mic
amplifier
in
the
Hands
Free
Kit
“QN-CD5HFK”
and
Head-set “QN-2HS” have an output 280mVrms into lOkii.
Audio OUT: >
The single ended output delivers 265mV into a 32Q load.