Nokia RX-44 Service Manual

Also see for NSERIES N810: Service manual User guide Service manual

Nokia RX-44 Service Manual Manual pdf 160 page image

Absolute maximum ratingsSignal Min Nom Max Unit NotesBattery voltage (idle) -0.3 +4.5 V Battery voltage maximum value isspecified during charging is activeBattery voltage (Call) +3.2 +4.3 V Battery voltage maximum value isspecified during charging is activeCharger input voltage -0.3 +20 VBack-Up supply voltage 0 2.5 2.6 V Maximum capacity of the backuppower supply assumed to be 16 μAh.Device modes of operationMode DescriptionNO_SUPPLY (dead) mode means that the main battery is not present or its voltage is too low (belowEM ASIC D1420 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 isadequate 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 D1420master reset threshold.RESET RESET mode is a synonym for start-up sequence.SLEEP SLEEP mode is entered only from PWR_ON mode with the aid of SW when the system’sactivity is low.FLASHING FLASHING mode is for SW downloading.Voltage limitsParameter Description ValueVMSTR Master reset threshold (D1420) 2.2V (typ.)VMSTR+ Threshold for charging, rising (N1310) 2.1V (typ.)VMSTR- Threshold for charging, falling (N1310) 1.9V (typ.)VCOFF+ Hardware cutoff (rising) 2.9V (typ.)VCOFF- Hardware cutoff (falling) 2.6V (typ.)SWCOFF SW cutoff limit ~3.2VThe master reset threshold controls the internal reset of EM ASICs. If battery voltage is above VMSTR, N1310charging control logic is alive. Also, RTC is active and supplied from the main battery. Above VMSTR, N1310allows the system to be powered on although this may not succeed due to voltage drops during start up. SWcan also consider battery voltage too low for operation and power down the system.RX-44System ModulePage 7 –6 COMPANY CONFIDENTIAL Issue 1Copyright © 2007 Nokia. All rights reserved.