Nokia 3105 서비스 매뉴얼
RH-48
System Module
CCS Technical Documentation
Page 6
©
2003 Nokia Corporation Confidential
Issue 1 11/2003
analog AFC signal to the RF section according to the UPP DSP digital control. It also con-
verts PA temperature into real data for the DSP. The UPP controls the RFIC through the
3-wire RFIC bus. UPP also provides PDM regulator for RF interface (RX/TX AGC control).
verts PA temperature into real data for the DSP. The UPP controls the RFIC through the
3-wire RFIC bus. UPP also provides PDM regulator for RF interface (RX/TX AGC control).
Charging Control
The CHACON block of UEM asics controls charging. Needed functions for charging con-
trols are pwm-controlled battery charging switch, charger-monitoring circuitry, battery
voltage monitoring circuitry and RTC supply circuitry for backup battery charging. In
addition, external components are needed for EMC protection of the charger input to the
baseband module. The DCT4 baseband is designed to electrically support both DCT3 and
DCT4 chargers.
trols are pwm-controlled battery charging switch, charger-monitoring circuitry, battery
voltage monitoring circuitry and RTC supply circuitry for backup battery charging. In
addition, external components are needed for EMC protection of the charger input to the
baseband module. The DCT4 baseband is designed to electrically support both DCT3 and
DCT4 chargers.
Digital Interface
Data transmission between the UEM and the UPP is implemented using two serial con-
nections, DBUS (9.6 MHz) for DSP and CBUS (1.2 MHz in CDMA) for MCU. UEM is a dual-
voltage circuit: the digital parts are running from 1.8V and the analog parts are running
from 2.78V. Vbat (3.6V) voltage regulators inputs also are used.
nections, DBUS (9.6 MHz) for DSP and CBUS (1.2 MHz in CDMA) for MCU. UEM is a dual-
voltage circuit: the digital parts are running from 1.8V and the analog parts are running
from 2.78V. Vbat (3.6V) voltage regulators inputs also are used.
Audio Codec
The baseband supports two external microphone inputs and one external earphone out-
put. The inputs can be taken from an internal microphone, from a headset microphone,
or from an external microphone signal source through a headset connector. The output
for the internal earpiece is a dual-ended type output, and the differential output is capa-
ble of driving 4Vpp to the earpiece with a 60 dB minimum signal to total distortion ratio.
Input and output signal source selection and gain control is performed inside the UEM
ASIC according to control messages from the UPP. Both a buzzer and an external vibra
alert control signals are generated by the UEM with separate PWM outputs.
put. The inputs can be taken from an internal microphone, from a headset microphone,
or from an external microphone signal source through a headset connector. The output
for the internal earpiece is a dual-ended type output, and the differential output is capa-
ble of driving 4Vpp to the earpiece with a 60 dB minimum signal to total distortion ratio.
Input and output signal source selection and gain control is performed inside the UEM
ASIC according to control messages from the UPP. Both a buzzer and an external vibra
alert control signals are generated by the UEM with separate PWM outputs.
MIDI
The MIDI audio signal generated by the DSP and UEM audio CoDec is routed to the XEAR
output of the UEM. An audio amplifier (LM4890) is used to boost enough power for the
speaker.
output of the UEM. An audio amplifier (LM4890) is used to boost enough power for the
speaker.
UI Drivers
The vibra, display LED, and keyboard LEDs are driven by open collector output drivers
inside UEM. These drivers can generate PWM square wave signals to these devices.
inside UEM. These drivers can generate PWM square wave signals to these devices.
AD Converters
There is an 11-channel analog-to-digital converter in UEM. The AD converters are cali-
brated in the production line.
brated in the production line.
BB-RF Interface Connections
All the signal descriptions and properties in the following tables are valid only for active
signals.
signals.