Power Levels TXC vs Temperature

Because of wide temperature range and poor cooling of the RF block, it is neccessary to compensate the effect of temperature on the output power. To monitor this environment change, temperature measurement is done by using NTC resistor. Factor table is used for temperature compensation,. The table contains common values for all power levels and operating modes. Table values are defined without factory measurements. Temperature is measured and right compensation value is added to TXC-val-ue....

Power off when battery voltage low

During normal discharge the phone indicates the user that the battery will drain after some time. If not recharged, SW detects that battery voltage is too low and shuts the phone off through a normal power down procedure. Anyway, if the SW fails to power down the phone, CCONT will make a reset and power down the phone if the battery voltage drops below 2.8 V. If the MAD receives fault indication, from the line TXF, that the transmitter is on although it shouldn't be, the control SW will power...

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- 6 Analog Control Channel (ACCH) Mode 3 - 8 Analog Voice Channel (AVCH) Mode 3 - 9 Digital Control Channel (DCCH) 800 MHz Mode 3 - 9 Digital Traffic Channel (DTCH) 800 MHz Mode 3 - 9 Signals between baseband and User Interface section . . 3 - 12 - 12 - 14 - 15 - 15 Power up when power-button is pushed 3 - 16 Power off when battery voltage - 18 Power off when fault in the transmitter 3 - 18 Technical Documentation System Module US4RSM - 21 - 23 - 27 - 28 Supply voltages in different modes of...

Baseband Module Power Distribution

Nokia 5120

In normal operation the baseband is powered from the phone's battery. The battery consists of one Lithium-cell. There is also a possibility to use batteries consisting of three Nickel- cells. An external charger can be used for recharging the battery and supplying power to the phone. The charger can be either so called fast charger, which can deliver supply current up to 850 mA or a standard charger that can deliver around 300 mA. Battery voltage VBAT is connected to CCONT which regulates all...