User Guide

Nokia Customer Care Troubleshooting - Baseband

6015/6015i/6016i/6019i (RH-55), 6012 (RM-20)

In sleep mode, the VCTCXO (19.2 MHz Clk) is shut down and the 32 kHz sleep clock

oscillator is used as a reference clock for the baseband.

The average current consumption of the phone can vary depending mainly on the SW

state. However, the average consumption is about 6 mA in slot cycle 0.

Active Mode

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

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

in the active mode depending on the phone’s present state, such as burst reception, burst

transmission, if DSP is working, etc.

In active mode, SW controls the UEM RF regulators: VR1A and VR1B can be enabled or

disabled. These regulators work of the UEM charge pump. VSIM can be enabled or

disabled and its output voltage can be programmed to be 1.8 V or 3.3 V. VR2 and

VR4–VR7 can be enabled, disabled, or forced into low quiescent current mode. VR3 is

always enabled in active mode and disabled during sleep mode and cannot be controlled

by SW.

Charging Mode

Charging mode can be performed in parallel with any other operating mode. A BSI

resistor inside the battery indicates the battery type/size. The resistor value corresponds

to a specific battery type and capacity. This capacity value is related to the battery

technology.

The battery voltage, temperature, size and charging current are measured by the UEM,

and the UEM charging algorithm controls it.

The charging control circuitry (CHACON) inside the UEM controls the charging current

delivered from the charger to the battery. The battery voltage rise is limited by turning

the UEM switch off when the battery voltage reaches 4.2 V. The charging current is

monitored by measuring the voltage drop across a 220 mOhm resistor.

Power

In normal operation, the baseband is powered from the phone's battery. The battery

consists of one Lithium-Ion cell. The battery capacity is 1070 mAh.

The UEM ASIC controls the power distribution to the whole phone through the BB and RF

regulators excluding the power amplifier (PA) and the DC/DC, which have a continuous

power rail directly from the battery. The battery feeds power directly to the following

parts of the system:

•UEM

•PA

•DC/DC

• Buzzer