RH-53/54
Nokia Customer Care 8-System Module
26 COMPANY CONFIDENTIAL Issue 2 06/2005
Copyright © 2005 Nokia. All Rights Reserved.
■ Batteries
Type:BL-4C battery
Technology:Li-Ion. 4.2V charging. 3.1V cut-off
Capacity:760 mA/h
Figure 7:BL-4C battery
The BSI values for the batteries:
Inside the battery, an over-voltage protection circuit are present.
The battery does not contain a temperature sensor. Since the battery is using the Li-Ion tech-
nology, care should be taken while charging. The material might be overheated when charged
above 60 degrees Celsius. Charging should be terminated when this temperature is reached.
An external temperature sensor (NTC resistor) is placed on the PWB close to the end of the
battery.
■ Keyboard
The keyboard PWB layout consists of a grounded outer ring and an inner pad see Figure 8.
Figure 8:Keyboard PWB layout
The keyboard is not a matrix keyboard, but is connected direct to UPP. The following table
shows the keyboard connection.
Table 14:
Overview of keyboard configuration
UPP Pin RH-53 Key
In/
Out
Internal Pull
Up/down
Interrupt
GenIO1 0 In Up GenIOInt5 Falling edge interrupt
GenIO2/
P05
7 In Up P0 int Falling edge interrupt
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