System Module: Baseband; Baseband Module, Technical Summary - Nokia NSB-9 Service Manual

NSB-9
System Module and User Interface

System Module: Baseband

Baseband Module, technical summary

Main functionality of the NSB-9 baseband is implemented with two ASICs: UPP (Univer-
sal Phone Processor) and UEM (Universal Energy Management).
LCD LCD
LED LED
driver driver
VIBRA VIBRA
HALL sw. HALL sw.
SIM SIM
Battery Battery
BLC-2 BLC-2
V V
OUT OUT
2.8V 2.8V
Charger Charger
Baseband is running from power rails 2.8V analog voltage and 1.8V I/O voltage. UPP core
voltages can be lowered down to 1.0V, 1.3V and 1.5V. UEM includes 6 linear LDO (low
drop-out) regulators for baseband and 7 regulators for RF. It also includes 4 current
sources for biasing purposes and internal usage. UEM also includes SIM interface which
has supports both 1.8V and 3V SIM cards.
A real time clock function is integrated into the UEM which utilizes the same 32kHz
clock supply as the sleep clock. A backup power supply is provided for the RTC which
keeps the real time clock running when the main battery is removed. The backup power
supply is a rechargeable surface mounted battery (capacitor type). The backup time with
the battery is 30 minutes minimum.
The analog interface between the baseband and the RF section is handled by a UEM
ASIC. UEM provides A/D and D/A conversion of the in-phase and quadrature receive and
transmit signal paths and also A/D and D/A conversions of received and transmitted
Page 8
Figure 1: Baseband Block Diagram
RF interface RF interface
(GSM) (GSM)
UEMK UEMK
DC DC DC
System connector System connector System connector
jack jack jack
Tomahawk Tomahawk Tomahawk
Nokia Corporation
CCS Technical Documentation
UPP8M UPP8M
Mo/St Amp Mo/St Amp
LM4855 LM4855
IR IR
Memories Memories
128M FLASH 128M FLASH
(incl. EEPROM) (incl. EEPROM)
8M SRAM 8M SRAM
ENGINE ENGINE
KEYBOARD KEYBOARD
FLIP FLIP
KEYBOARD KEYBOARD
1.8V 1.8V uC uC
L L
FM radio FM radio
R R
Issue 1 04/03