Battery Interface - Nokia RM-392 Service Manual

RM-392; RM-393
System Module
Signal From
BSI

Battery interface

• Type: BL-4S
• Technology: Li-Ion, 4.2 V charging, 3.1 V cut-off
• Capacity: 860 mAh.
BL-4S 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.
Signal name
GND
BSI
VBAT
Issue 1
To Min
Liteplus 0
Figure 114 BL-4B battery pack contacts
Table 13 Pin numbering of battery pack
Pin number
2
3
1
COMPANY CONFIDENTIAL
Copyright © 2008 Nokia. All rights reserved.
Nom Max
2.78
Negative/common battery
terminal
Battery capacity measurement
(fixed resistor inside the battery
pack)
Positive battery terminal
Note
Analog input, Battery Size
Indicator Resistor, 100
kohm pull up to 2.78V
(VBB1). FDL Init, refer to
flash download.
Function
Page 6 –19