Nokia NSE–3 SERIES Service Manual

Contents

Nokia NSE–3 SERIES Service Manual Manual pdf 16 page image

PAMSTechnical DocumentationNSE–3System ModuleOriginal 11/97Page 3 – 10Baseband ModuleBlock DiagramCCONTUISIMMADSYSCONCHAPSCOBBABATTERYPA SUPPLYRF SUPPLIESBB SUPPLYTX/RX SIGNALSBASEBANDVBAT+MEMORIESCOBBA SUPPLYAUDIOLINESIR32kHzCLK13MHzCLKSLEEP CLOCKSYSTEM CLOCKTechnical SummaryThe baseband module consists of four asics, CHAPS, CCONT, COBBA–GJ and MAD2, which take care of the baseband functions of NSE–3.The baseband is running from a 2.8V power rail, which is supplied by apower controlling asic. In the CCONT asic there are 6 individually con-trolled regulator outputs for RF–section and two outputs for the base-band. In addition there is one +5V power supply output (V5V) for flashprogramming voltage and other purposes where a higher voltage is need-ed. The CCONT contains also a SIM interface, which supports both 3Vand 5V SIM–cards. A real time clock function is integrated into theCCONT, which utilizes the same 32kHz clock supply as the sleep clock. Abackup power supply is provided for the RTC, which keeps the real timeclock running when the main battery is removed. The backup power sup-ply is a rechargable polyacene battery. The backup time with this batteryis minimum of ten minutes.