Nokia n81 Service Manual
Also see for N81: User guideSpecification sheetUser guideUser guideUser guide
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Contents
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The battery temperature is estimated by measuring separate battery temperature NTC via the BTEMP line.This is located on the main PWB, at the place where the phone temperature is closest to the batterytemperature.Battery connectorThe battery connector is a blade connector. It has three blades;• BSI (Battery size indicator)• GND (Ground)• VBAT (Battery voltage)The BSI line is used to recognize the battery capacity by a battery internal pull down resistor.Figure 54 Battery connectorChargingThis phone is charged through the smaller Nokia standard interface (2.0 mm plug). The wider standardcharger (3.5 mm) can be used together with the CA-44 charger adapter.Figure 55 Small (right) and wide (left) charger plugCharging is controlled by energy management, and external components are needed to protect the basebandmodule against EMC, reverse polarity and transient frequency deviation.Backup batteryWhen the main battery is not attached EM ASIC (N2200) goes in backup mode using back-up battery thatsupplies voltage to RTC in EM ASIC (N2200).RM-179; RM-223System Module and User InterfacePage 6 –10 COMPANY CONFIDENTIAL Issue 1Copyright © 2007 Nokia. All rights reserved. |
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