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-4B
• Technology: Li-Ion, 4.2 V charging, 3.1 V cut-off
• Capacity: 700 mAh.
BL-4B 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 113 BL-4B 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-362; RM-363
System Module
Page 6 –18 COMPANY CONFIDENTIAL Issue 1
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