Figure 85 SIM interface block diagram
Battery connector
Table 9 Battery IF
Signal From To Min Nom Max Condi-tion Note
GND Global Batt (-) Global GND
VBAT Batt (+) 3.1 5.4 Battery Voltage
BSI LITTI 0 2.78 Analog input, Battery Size
Indicator Resistor, 100
kohm pull up to 2.78V
(VBB1).
Battery BL-5C
• Type: BL-5C
• Technology: Li-Ion, 4.2 V charging, 3.1 V cut-off
• Capacity: 1020 mAh.
The BSI resistor is placed on the main PWB as the telephone supports only one battery capacity. Further a
BSI connection is added to the Flash interface. The battery temperature is measured by a NTC resistor placed
on the main PWB, opposite to the Battery. Battery pack has an impedance of 130 - 150 mΩ (0 – 45 °C).
Figure 86 BL-5C battery block
RM-305; RM-306
System module
Issue 2 COMPANY CONFIDENTIAL Page 6 –13
Copyright © 2007 Nokia. All rights reserved.
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