User Guide

NHM-8NX
System Module & UI PAMS Technical Documentation
Page 6 ãNokia Corporation Issue 1 05/02
Technical Summary
The baseband module contains 2 main ASICs named the UEM and UPP. The baseband
module furthermore contains an audio amplifier LM4890 for MIDI support and a 64Mbit
Flash IC. The baseband is based on the DCT4 engine program.
Figure 1: NHM-8NX baseband block diagram
The UEM supplies both the baseband module as well as the RF module with a series of
voltage regulators. Both the RF and Baseband modules are supplied with regulated volt-
ages of 2.78 V and 1.8V. UEM includes 6 linear LDO (low drop-out) regulators for base-
band and 7 regulators for RF. BB regulator VFLASH1, RF regulators VR1B, VR4 as well as
the current sources IPA1 and IPA2 must be kept disabled by SW, as they are left uncon-
nected on the PWB. The UEM is furthermore supplying the baseband SIM interface with a
programmable voltage of either 1.8 V or 3.0 V. The core of the UPP is supplied with a
programmable voltage of 1.0 V, 1.3 V, 1.5 V or 1.8 V.
UPP operates from a 26MHz clock, coming from the RF ASIC MJOELNER (see chapter 7.11
for details), the 26 MHz clock is internally divided by two, to the nominal system clock of
13MHz. DSP and MCU contain phase locked loop (PLL) clock multipliers, which can mul-
tiply the system frequency by factors from 0.25 to 31. Practical speed limitations is
depending on memory configuration and process size (Max. DSP speed for C035 process
is ~ 200MHz)
The UEM contains a real-time clock, sliced down from the 32768 Hz crystal oscillator.
RFBUS
UEM
UPP
FLASH
Battery
CBUS/
DBUS
BB
Supplies
RF Supplies
UI
DCT4 Janette connector
RF RX/TX
PA Supply
MBus/FBus
External Audio
Charger connection
Mjoelner
26MHz
SLEEPCLK
32kHz
Baseband
MEMADDA
M
VIBRA
HF
EAR
MIC
DLIGHT
SIM
LM4890