Nokia NSE-6 SERIES Service Manual

Also see for NSE-6 SERIES: Technical documentation Tuning Instructions Disassembly & troubleshooting instructions

Contents

Nokia NSE-6 SERIES Service Manual Manual pdf 36 page image

PAMSTechnical DocumentationNSE–6System ModuleOriginal 08/98Page 3 – 24Switched Mode Supply VSIMThere is a switched mode supply for SIM–interface and 5V regulator,which supplies to RF section. SIM voltage is selected via serial IO. The5V SMR can be switched on independently of the SIM voltage selection,but can’t be switched off when VSIM voltage value is set to 5V.NOTE: VSIM and V5V can give together a total of 30mA.In the next figure the principle of the SMR / VSIM–functions is shown.V5VCCONT ExternalV5V_3V5V_4V5V_2VBAT5V5V regVSIM5/3VPower UpThe baseband is powered up by:1. Pressing the power key, that generates a PWRONX interruptsignal from the power key to the CCONT, which starts the pow-er up procedure.2. Connecting a charger to the phone. The CCONT recognizesthe charger from the VCHAR voltage and starts the power upprocedure.3. A RTC interrupt. If the real time clock is set to alarm and thephone is switched off, the RTC generates an interrupt signal,when the alarm is gone off. The RTC interrupt signal is con-nected to the PWRONX line to give a power on signal to theCCONT just like the power key.4. A battery interrupt. Intelligent battery packs have a possibilityto power up the phone. When the battery gives a short (10ms)voltage pulse through the BTEMP pin, the CCONT wakes upand starts the power on procedure.