Nokia n81 Service Manual

Also see for N81: User guide Specification sheet User guide User guide User guide

Contents

Nokia n81 Service Manual Manual pdf 197 page image

Normal and extreme voltagesEnergy management is mainly carried out in the two Application Specific Integrated Circuits (ASICs) BETTYand AVILMA. These two circuits contains a number of regulators. In addition there are some externalregulators too.In the table below, normal and extreme voltages are shown when a BP-6MT battery is used.Table 7 Nominal voltagesVoltage Voltage [V] ConditionGeneral ConditionsNominal voltage 3.700Lower extreme voltage 3.145Higher extreme voltage4.230(fast charging)HW Shutdown VoltagesVmstr+ 2.1 ± 0.1 Off to onVmstr- 1.9 ± 0.1 On to offSW Shutdown VoltagesSw shutdown 3.25 In callSw shutdown 3.25 In idleMin Operating VoltageVcoff+ 2.9 ± 0.1 Off to onVcoff- 2.6 ± 0.1 On to offPower key and system power-upWhen 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 (the system is powered down with the aid ofSW). The power key is connected to EM ASIC N2200 (AVILMA) via PWRONX signal.Modes of operationMode DescriptionNO_SUPPLY (dead) mode means that the main battery is not present or its voltage is too low (belowN2200 AVILMA 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 32 kHz oscillator is running (RTC is on).PWR_OFF In this mode (warm), the main battery is present and its voltage is over N2300 BETTYmaster reset threshold. All regulators are disabled, PurX is on low state, the RTC is onand the oscillator is on. PWR_OFF (cold) mode is almost the same as PWR_OFF (warm),but the RTC and the oscillator are off.RM-179; RM-223System Module and User InterfaceIssue 1 COMPANY CONFIDENTIAL Page 6 –11Copyright © 2007 Nokia. All rights reserved.