Nokia RH-47 Series Description

Also see for RH-47 Series: Rf description and troubleshooting Disassembly & Assembly Instructions

Contents

Nokia Customer Care 6 - Baseband Description and TroubleshootingCompany Confidential RH-47Issue 1 05/04 Copyright © 2004 Nokia Corporation Page 13Company ConfidentialChargersRH-47 BB supports a standard charger (two wires), chargers ACP-8 and ACP-12, ciga-rette charger LCH-8 and LCH-12 are supported.BatteryRH-47 uses a detachable, semi-fixed lithium-Ion BL-6C battery. Nominal voltage is 3.7 V(max charging voltage 4.2 V).The interface consists of three pins: VBAT, GND and BSI. Pull-down resistor inside thebatteries (BSI signal) recognizes the battery types. Voltage level at BSI line is measuredusing UEM's AD-converter.Back-up battery and real time clockReal time clock (RTC), crystal oscillator and back-up battery circuitry reside in the UEM.A register in the UEM controls back-up battery charging. Charging is possible only in thePOWER_ON state.Baseband measurement A/D converterThe UEM contains 11 channels A/D converter, which is used for different baseband mea-surement purposes. The resolution of A/D converter is 10 bits. Converter uses the CBUSinterface clock signal for the conversion. An interrupt is given to the MCU at the end ofthe measurements. The converter is used for following purposes.• Battery voltage measurement A/D channel (Internal)• Charger voltage measurement A/D channel (Internal)• Charger current measurement A/D channel (Internal)• Battery temperature measurement A/D channel (External)• Battery size measurement A/D channel (External)• LED temperature measurement A/D channel (External)There is also auxiliary AD converter in the UEM, which is used to monitor RF functions.ZOCUSThe ZOCUS device is a current sensor used for the battery bar display and for determiningwhether the phone is in a high current consuming mode. The ZOCUS device measures thevoltage drop across a sense resistor in the battery voltage line. This sense resistor isformed from a PWB track and is on an internal layer of the PWB. The nominal value ofthe sense resistor is 3.3 mohm. ZOCUS reports the current measurement to UPP_WD2 viathe Cbus interface.