Nokia RH-6 Series Baseband Description & Troubleshooting page 17

CCS Technical Documentation
Audio block diagram
UPP
EARDATA
MICDATA
GENIO14
GENTEST0
FBUS_TX
FBUS_RX
Earpiece
RH-6 uses an earpiece which is also referred to as "PICO speaker". This is a 32 ohm
speaker with the diameter of 8 mm.
Earpiece is fed by the differential signals "EARP" & "EARN" from UEM. The signals run
quite directly from UEM to the earpiece, only some passive and EMC protection compo-
nents are needed.
The external earpiece signals is fed by the "HF" & "HFCM" pins.
The level (swing) of earpiece-signals can be adjusted by register values inside UEM. These
signals have common voltage level of 1.35 V (0.8 V for HF) at UEM pins.
Microphones
An EMC-improved type of microphone is used as internal microphone in RH-6, diameter
of which is 2.2mm.
Internal Microphone circuitry is driven single ended. Microphone needs bias voltage,
which is provided by UEM and is fed through a resistor to the microphone. A resistor is
Issue 1 10/2003
Company Confidential
VIBRA
UEM
MICB1
MIC1P
MIC1N
EARP
EARN
EARDATA
MICDATA
HOOKINT
MICB2
MIC2P
MIC2N
HF
HFCM
XEAR
Figure 5: Audio Block Diagram
© 2003 Nokia Corporation.
6 - BB Description & Troubleshooting
M
internal microphone path
Internal Microphone
earpiece path
accessory transmit path
accessory receive path
ESDA
IHF speaker path
+
On/Off
IHF Amplifier
J103 ProdTP6
RH-6
VBAT
Earpiece
XMICP
XMICN
XEARP
XEARN
IHF Speaker
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