Voltage
Voltage [V]
Condition
Lower extreme voltage
3.5
Higher extreme voltage
(fast charging)
4.1
HW Shutdown Voltages
Vmstr+
2.1 ± 0.1
Off to on
Vmstr-
1.9 ± 0.1
On to off
SW Shutdown Voltages
Sw shutdown
3.1
In call
Sw shutdown
3.2
In idle
Min Operating Voltage
Vcoff+
3.1 ± 0.1
Off to on
Vcoff-
2.8 ± 0.1
On to off
Power key and system power-up
When the battery is placed in the phone, the power key circuits are energized. When the power key is pressed,
the system boots up (if an adequate battery voltage is present).
Power down can be initiated by pressing the power key again and the system is powered down with the aid
of SW. The power key is connected to EM ASIC (N2200) via the PWRONX signal.
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 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 32 kHz oscillator is running (RTC is on).
PWR_OFF
In this mode (warm), the main battery is present and its voltage is over EM ASIC 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 can be entered in four different ways: by connecting the charger, by RTC
alarm, by IBI pulse or by pressing the power key. Hardware controlled regulators are
on. VCTCXO is powered. After 16 ms delay Gazoo enters POWER_ON.
POWER_ON
PurX is released. The system control goes mainly to digital ASIC and software (EM ASIC
can still power down system in case of over heating).
DEEP SLEEP
VCTCXO powering is off and the system is running with the sleep clock. Regulators are
in sleep mode.
COMA mode
New power save mode (power domains) in RAPU
RM-424; RM-564
System Module
Page 6 –10
COMPANY CONFIDENTIAL
Issue 1
Copyright © 2009 Nokia. All rights reserved.
