Nokia rx-34 Service Manual

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Nokia rx-34 Service Manual Manual pdf 187 page image

Power keyThe system boots up when power key is pressed (adequate battery voltage, VBAT, present).Power down can be initiated by pressing the power key again (the system is powered down with the aid ofSW).Power distributionGenerally, RX-34 EM architecture is implemented with three EM ASICs, EM ASIC D1420, EM ASIC N1310 and EMASIC N4200 controlling the EM and supplying the output voltages.In addition to the ASIC, N5351 PM ASIC handles the power supply for HS USB controller.In addition to EM ASIC D1420, EM ASIC N1310, PM ASIC N5351 and EM ASIC N4200 IC’s, RX-34 EM includesfunctionalities to be powered using discrete regulator or direct battery voltage supply.The following functionality will be supplied with discrete power supply (Low Dropout Linear Regulator, Iout150 mA, typical Iq no load 80 uA, Vout 2.8V package 4-bump WLCSP, output noise 40 uV):• LCD• System clock oscillator• Analog voltage supply for level shiftersClocking scheme and controlling signalsThere are two main clocks in the BB system: 19.2 MHz square wave clock provided by discrete oscillator and32.678 kHz sleep clock produced by the EM ASIC D1420 with an external crystal.Figure 58 Clocking schemeInterfacesBluetoothBluetooth data interface is connected to UART1 of application processor D4800. UART is an asynchronousinterface for transferring data and control information to BT device.RX-34System ModuleIssue 2 COMPANY CONFIDENTIAL Page 9 –7Copyright © 2007 Nokia. All rights reserved.