Signal From To Min Nom Max Note
BSI UEMCLite 0 2.78 Analog input, Battery Size
Indicator Resistor, 100
kohm pull up to 2.78V
(VBB1). FDL Init, refer to
flash download.
Battery interface
• Type: BL-5BT
• Technology: Li-Ion, 4.2 V charging, 3.1 V cut-off
• Capacity: 870 mAh.
BL-5BT has a 3 pin interface with overcharge / discharge protection (safety circuit) and battery size indication
BSI with an internal resistor. The BSI fixed resistor value indicates type and default capacity of a battery.
Figure 114 BL-5BT battery pack contacts
Table 13 Pin numbering of battery pack
Signal name Pin number Function
GND 2 Negative/common battery
terminal
BSI 3 Battery capacity measurement
(fixed resistor inside the battery
pack)
VBAT 1 Positive battery terminal
RM-340; RM-341
System Module
Issue 1 COMPANY CONFIDENTIAL Page 6 –19
Copyright © 2007 Nokia. All rights reserved.
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