Block Diagram - Nokia RH-37 Series Manual

Transceivers, system module

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Block diagram

UEMEK supplies both baseband and RF with power via built in voltage regulators, which

are connected to the battery. The RF parts use mainly 2.78 V and the baseband parts 1.8V

I/O voltage. The UPP core is supplied with programmable core voltage of 1.0V, 1.3V or

1.5V. UEMEK includes 7 linear LDO (Low Drop-Out) regulators for baseband and 7 regula-

tors for RF. It also includes 4 current sources for biasing purposes and internal usage. The

UEMEK is furthermore supplying the SIM interface with a programmable voltage of 1.8V

or 3V.

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

UPP operates from a 26 MHz clock coming from the RF ASIC Helgo. The clock signal is

divided by two down to the nominal system clock frequency of 13 MHz. The DSP and

MCU contain PLLs, which can multiply the system clock to a higher frequency.

A real time clock function is integrated into the UEMEK, which utilizes the same 32kHz

clock supply as the sleep clock.

The communication between UEMEK and UPP is implemented using two bi-directional

serial busses, CBUS and DBUS. The CBUS is controlled by the MCU and operates at a

Issue 1 07/04

Figure 1: Baseband block diagram

RH-37

System Module

Page 11

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