Nokia RM-217 Sevice Manual

Also see for 6300 - Cell Phone 7.8 MB: Specification sheet User guide User guide User guide Service manual

Contents

Nokia RM-217 Sevice Manual Manual pdf 195 page image

• SDRAM and NOR flash memoriesRF engineThe RF module performs the high frequency operations of the engine for GSM. In both transmitter andreceiver, the modulator and demodulator operate at the channel frequency.The core components of the RF module are:• Ahne RF ASIC (application specific integrated circuit)• Front end module (FEM) module (Power amplifier and Antenna switch)The RF engine also includes:• Voltage controlled oscillators (VCO and VCTCXO)• SAW filtersThe baseband section controls the RF module through the serial bus, RFBus. This passes information abouteg. frequency band and mode of operation. Ahne RF ASIC controls the mode of operation, and further sendscontrol signals to the front end module.In addition to the RFBus there are other interface signals for the power control loop, VCTCXO control and forthe modulated waveforms.Main processorThe main processor in this device is RAPGSM, a BB5.0 ASIC.Some of its interfaces, processors and controllers are:• General purpose UARTs• Processor modules• I2C (between ICs) interface• GSM coder• Interfaces to user interface, SIM and MMC• Accessory interface• Handling of RF-BB interface• I/O voltage = 1.8 V, Core voltage <1.8 VEnergy managementTwo ASICs manages the energy in the phone; Retu and Tahvo. Together they cover the analogue audio andenergy management function needs.TahvoAll blocks that need a special silicon process are included in Tahvo.Tahvos main features are:• Energy management control• Supply voltage generation• Charge control• Digital core supply• Current control for LED supplyRetuThe blocks that do not have special needs are included in Retu.Retu controls for example:RM-217; RM-222System module Nokia Customer CareIssue 1 COMPANY CONFIDENTIAL Page 8 –9Copyright © 2007 Nokia. All rights reserved.