Nokia 6220 Service Manual
CCS Technical Documentation
System Module and User Interface
Company confidential
RH-20
Issue 1 10/2003
Nokia Corporation.
Page 9
The UEM ASIC handles the analog interface between the baseband and the RF section
.
UEM provides A/D and D/A conversion of the in-phase and quadrature receive and trans-
mit signal paths and also A/D and D/A conversions of received and transmitted audio sig-
nals to and from the user interface. The UEM supplies the analog TXC and AFC signals to
RF section according to the UPP DSP digital control. Data transmission between the UEM
and the UPP is implemented using two serial busses, DBUS for DSP and CBUS for MCU.
There are also separate signals for PDM coded audio. Digital speech processing is handled
by the DSP inside UPP ASIC. UEM is a dual voltage circuit, the digital parts are running
from the baseband supply 1.8V and the analog parts are running from the analog supply
2.78V. Also VBAT is directly used (Vibra, LED-driver, Audio amplifier).
mit signal paths and also A/D and D/A conversions of received and transmitted audio sig-
nals to and from the user interface. The UEM supplies the analog TXC and AFC signals to
RF section according to the UPP DSP digital control. Data transmission between the UEM
and the UPP is implemented using two serial busses, DBUS for DSP and CBUS for MCU.
There are also separate signals for PDM coded audio. Digital speech processing is handled
by the DSP inside UPP ASIC. UEM is a dual voltage circuit, the digital parts are running
from the baseband supply 1.8V and the analog parts are running from the analog supply
2.78V. Also VBAT is directly used (Vibra, LED-driver, Audio amplifier).
The baseband supports both internal and external microphone inputs and speaker out-
puts. Input and output signal source selection and gain control is performed by the UEM
according to control messages from the UPP. Keypad tones, DTMF, and other audio tones
are generated and encoded by the UPP and transmitted to the UEM for decoding. An
external vibra alert control signals are generated by the UEM with separate PWM out-
puts.
puts. Input and output signal source selection and gain control is performed by the UEM
according to control messages from the UPP. Keypad tones, DTMF, and other audio tones
are generated and encoded by the UPP and transmitted to the UEM for decoding. An
external vibra alert control signals are generated by the UEM with separate PWM out-
puts.
RH-20 has a serial control interface: FBUS. FBUS can be accessed through a test pad and
the System Connector as described later. EMC shielding is implemented using a metal-
lized plastic frame. On the other side, the engine is shielded with PWB grounding.
the System Connector as described later. EMC shielding is implemented using a metal-
lized plastic frame. On the other side, the engine is shielded with PWB grounding.
Environmental Specifications
Temperature Conditions
Full functionality through ambient temperature range -10
o
C to +55
o
C.
Reduced functionality between -25
o
C to -10
o
C and +55
o
C to +75
o
C.
Humidity and Water Resistance
Full functionality in humidity range is 5% - 95%.
Condensed or dripping water may cause intermittent malfunctions. Protection against
dripping water is implemented.
dripping water is implemented.