User Guide

RH-30/RH-31 Company Confidential

System Module Nokia Customer Care

System Module: Baseband

The system module (or Engine) consists of baseband and RF sub-modules, each described

below.

Baseband module, technical summary

Main functionality of the baseband is implemented into two ASICs: UPP (Universal Phone

Processor) and UEM (Universal Energy Management).

Figure 2: Baseband block diagram

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) regulator 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

supports both 1.8V and 3V SIM cards.

Note: 5V SIM cards are no longer supported by DCT-4 generation baseband.

A real time clock function is integrated into the UEM. RTC utilizes the same 32kHz clock

supply as the sleep clock. A backup power supply is provided for the RTC-battery, which

keeps the real time clock running when the main battery is removed. The backup power

supply is a rechargeable surface mounted Li-Ion battery. The backup time with the bat-