Board and module connections
Figure 59 Board and module connections
Energy management
Battery and charging
BP-4L battery
The phone is powered by a 3-pole BP-4L battery S-pack 1500 mAh battery. The three poles are named VBAT,
BSI and GND where the BSI line is used to recognize the battery capacity. This is done by means of an internal
battery pull down resistor.
Figure 60 Battery pin order
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 battery
temperature.
Battery connector
The battery connector is a blade connector. It has three blades;
•
BSI (Battery size indicator)
•
GND (Ground)
RM-505; RM-506
System Module and User Interface
Issue 1
COMPANY CONFIDENTIAL
Page 8 –9
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