Baseband functional description
Digital baseband consists of an ISA (Intelligent Software Architecture) based modem and Symbian based
application sections. The modem functionality is in RAP, and the application processor acts as a platform for
Symbian applications. The terms ISA and Symbian are used refer to the software environment of these
devices.
The modem section consists of a RAP ASIC with NOR FLASH and SDRAM memory as the core. RAP supports
WCDMA and GSM cellular protocols. The modem DDR SDRAM memory has 128 Mbits of memory and NOR flash
has 128 Mbits of memory. RAP operates with the system clock of 38.4 MHz, which comes from the VCTCXO.
The application section includes an application processor ASIC with DDR/NAND combo memory as the core.
Absolute maximum ratings
Signal Min Nom Max Unit Notes
Battery voltage (idle) -0.3 +4.5 V Battery voltage maximum value is
specified during charging is active
Battery voltage (Call) +3.2 +4.3 V Battery voltage maximum value is
specified during charging is active
Charger input voltage -0.3 +20 V
Back-Up supply voltage 0 2.5 2.6 V Maximum capacity of the backup
power supply assumed to be 3 µAh.
Phone modes of operation
Mode Description
NO_SUPPLY (dead) mode means that the main battery is not present or its voltage is too low (below
EM ASIC N2200 master reset threshold) and that the back-up battery voltage is too low.
BACK_UP The main battery is not present or its voltage is too low but back-up battery voltage is
adequate and the 32kHz oscillator is running (RTC is on).
PWR_OFF In this mode (warm), the main battery is present and its voltage is over EM ASIC N2200
master reset threshold. All regulators are disabled, PurX is on low state, the RTC is on
and the oscillator is on. PWR_OFF (cold) mode is almost the same as PWR_OFF (warm),
but the RTC and the oscillator are off.
RESET RESET mode is a synonym for start-up sequence. In this mode certain regulators are
enabled and after they and RFClk have stabilized, the system reset (PurX) is released
and PWR_ON mode entered. RESET mode uses 32kHz clock to count the REST mode delay
(typically 16ms).
RM-91; RM-92
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