User Guide

Mode Description
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. RESET mode uses 32kHz clock to count
the REST mode delay (typically 16ms).
SLEEP SLEEP mode is entered only from PWR_ON mode with the aid of SW when the system’s
activity is low.
Voltage limits
Parameter Description Value
VMSTR Master reset threshold (EM ASIC N2200) 2.2V (typ.)
VMSTR+ Threshold for charging, rising (EM ASIC N2300) 2.1V (typ.)
VMSTR- Threshold for charging, falling (EM ASIC N2300) 1.9V (typ.)
VCOFF+ Hardware cutoff (rising) 2.9V (typ.)
VCOFF- Hardware cutoff (falling) 2.6V (typ.)
SWCOFF SW cutoff limit ~3.2V
Power key
The system boots up when power key is pressed (adequate battery voltage, VBAT, present).
Power down can be initiated by pressing the power key again (the system is powered down with the aid of
SW).
Power distribution
Power supply components:
• RETU
• TAHVO
• BT LDO
• MicroSD LDO
• backlight SMPSs
All the above are powered by the main battery voltage.
Battery voltage is also used on the RF side for power amplifiers (GSM PA) and for RF ASIC Ahne.
Discrete power supplies are used to generate 1.8V for the camera module, 2.85V for MicroSD card and max.
18V for backlight LEDs.
The device supports both 1.8V/3V SIM cards.
Bluetooth
Bluetooth provides a fully digital link for communication between a master unit and one or more slave units.
The system provides a radio link that offers a high degree of flexibility to support various applications and
product scenarios. Data and control interface for a low power RF module is provided. Data rate is regulated
between the master and the slave.
RM-198
Nokia Customer Care System Module
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