System Module; Baseband Module - Nokia NPM-6 Series Manual

System Module and User Interface

System Module

The System module (or Engine) consists of Baseband and RF sub-modules, each described
below.

Baseband Module

Main functionality of the baseband is implemented into two ASICs: UPP (Universal Phone
Processor) and UEM (Universal Energy Management).
UPP ASIC provides the MCU, DSP, external memory interface and digital control func-
tions.
UEM ASIC contains power supply circuitry, charging, audio processing and RF control
hardware.
The baseband architecture supports a power saving function called "sleep mode". This
sleep mode shuts off the VCTCXO, which is used as system clock source for both RF and
baseband. During the sleep mode the system runs from a 32 kHz crystal. The phone is
waken up by a timer running from this 32 kHz clock supply. The sleep time is determined
by net work parameters. Sleep mode is entered when both the MCU and the DSP are in
standby mode and the normal VCTCXO clock is switched off.
NPM-6 supports both three and two wire type of Nokia chargers. Three wire chargers are
treated like two wire ones. There is not separate PWM output for controlling charger but
it is connected to GND inside the bottom connector. Charging is controlled by UEM ASIC
(Universal Energy Management) and EM SW running in the UPP (Universal Phone Proces-
sor).
BL-4C Li-ion rechargeable battery is used as main power source for NPM-6. BL-4C has a
capacity of 720 mAh.
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ãNokia Corporation.
CCS Technical Documentation
Issue 1 01/03