Nokia Customer Care
TF5 Technical Information
Company Confidential
TFE-4/RV-1
Issue 2.0 Mar/2005
Copyright
©
2005
Nokia Corporation.
Page 8a-23
Company Confidential
The Audio Block consists of two major parts, the HFAudio-Block, which is responsible for
the handsfree audio functionality, and the HDAudio-Block, which is responsible for the
Headset Audio. Additionally there is a preflight for the B2Bxear lines from the EB and
level shifters for the mute lines. HFAudio interfaces single-ended to the microphone and
to the speaker. The HDAudio path is implemented with symmetric speaker and micro-
phone lines.
Description of Inputs, Outputs and Block-Internal Lines
Signalname
Description
Range
When Error then .......
Control-Inputs
B2BHFMUTE
Control Signal to Mute the
HF Amplifier and HF Micro-
phone
Low: 0..0.5V
high:
1.6..1.8V
HF-Amplifier and HF MIC
will be always on
(when always low)
or both do not work
(when always high)
B2BHDMUTE
Control Signal to Mute the
HD Amplifier
Low: 0..0.5V
high:
1.6..1.8V
HD-Amplifier will be
always on
(when always low)
or does not work
(when always high)
Powersupplies
VMIC
Powersupply for HF-Micro-
phone
5V 5%
HF-MIC Phantom Voltage
will not work, VBIAS will
be of
VEBPWR
Powersupply for Headset
poweramplifier
Sleepmode: 0V
active: 4.2V 5%
Headset poweramplifier
will not work
VAudio
Powersupply for Handsfree
poweramplifier
HF Poweramplifier will
not work
Audio-Signals
B2BXEAR_P
B2BXEAR_N
Symmetric Audio Signal gen-
erated by phoneengine for
HF- and HD-Speaker (Output
selected by HDMUTE/
HFMUTE)
No Audio Signal to any
Speaker
B2BHDMIC_P
B2BHDMIC_N
Symmetric Audio Signal gen-
erated by Headset Micro-
phone
No Microphone Signal
from Headset
B2BHFMIC_P
B2BHFMIC_N
Symmetric Audio Signal gen-
erated by Handsfree Micro-
phone Amplifier
No Microphone Signal
from Handsfree
