User Guide

CC Technical Documentation System Module

RM-11

Technical Summary

The baseband module is implemented using two main ASICs — the Universal Energy

Management (UEM) and the Universal Phone Processor (UPP). The baseband module also

contains an audio amplifier for MIDI support and a 128-Mbit Flash/ 8-Mbit SRAM

combo IC. EMC shielding is implemented using a metallized plastic frame. On the other

side, the engine is shielded with PWB ground openings. Heat generated by the circuitry is

conducted out via the PWB ground planes. The RM-11 transceiver module is imple-

mented on a 6-layer, FR-4 material PWB.

Functional Description

Modes of Operation

The RM-11 baseband engine has five different operating modes:

• No supply

• Acting dead

•Active

•Sleep

• Charging

No Supply Mode

In NO_SUPPLY mode, the phone has no supply voltage. This mode is due to the discon-

nection of the main battery or a low battery voltage level. The phone exits from

NO_SUPPLY mode when a sufficient battery voltage level is detected. The battery voltage

can rise either by connecting a new battery with VBAT > VMSTR+, or by connecting a

charger and charging the battery voltage to above VMSTR+.

Acting Dead Mode

If the phone is powered off when the charger is connected, the phone is powered on and

enters a state called Acting Dead. In this mode, no RF circuitry is powered up. To the user,

the phone acts as if it is switched off. The phone issues a battery-charging alert and/or

shows a battery charging indication on the display to acknowledge to the user that the

battery is charging.

Active Mode

In active mode, the phone is in normal operation, scanning for channels, listening to a

base station, transmitting, and processing information. There are several sub-states in

the active mode depending on if the phone is in burst reception, burst transmission, etc.

SW controls the RF regulators by writing the correct values into the UEM control

registers. VR1A/B and VR2 can be enabled or disabled. VR4 - VR7 can be enabled,

disabled, or forced into low quiescent current mode. VR3 is always enabled in active

mode.