Voltage limits
Parameter Description Value
VMSTR Master reset threshold (N2200) 2.2V (typ.)
VMSTR+ Threshold for charging, rising (N2300) 2.1V (typ.)
VMSTR- Threshold for charging, falling (N2300) 1.9V (typ.)
VCOFF+ Hardware cutoff (rising) 2.9V (typ.)
VCOFF- Hardware cutoff (falling) 2.6V (typ.)
SWCOFF SW cutoff limit
~3.25V (defined
by SW)
The master reset threshold controls the internal reset of EM ASICs. If battery voltage is above VMSTR, N2300
charging control logic is alive. Also, RTC is active and supplied from the main battery. Above VMSTR, N2300
allows the system to be powered on although this may not succeed due to voltage drops during start up. SW
can also consider battery voltage too low for operation and power down the system.
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 key is connected to EM ASIC N2200 via PWRONX signal.
RM-247
System Module
Issue 1 COMPANY CONFIDENTIAL Page 7 –7
Copyright © 2008 Nokia. All rights reserved.