User Guide

Pin Signal I/O Engine connection Notes
A4 2DIR <- Application
processor
MMC2_DATDIR
1
Data direction 1
REG
VEN <- Application
processor
GPIO41 miniSD regulator
enable
Misc.
-> Application
processor
Battery cover switch
Battery interface
The battery interface supports the NMP battery interface for the BL-6C battery. This interface consists of three
connectors: VBAT, BSI and GND.
The BSI line is used to recognize the battery capacity by a battery internal pull down resistor.
Figure 90 Battery pin order
Battery temperature is estimated by measuring separate battery temperature NTC via the BTEMP line, which
is located on the transceiver PWB, at a place where the phone temperature is most stabile.
The connection from the charger connector to the charger is established via a charger adaptor type CA-44.
For service purposes, the device SW can be forced into local mode by using pull down resistors connected to
the BSI line.
Table 12 Battery interface connections
Pin Signal I/O Engine connection Notes
1 VBAT -> EM ASIC
(N2200)
VBAT Battery voltage
2 BSI -> EM ASIC
(N2200)
BSI Battery size
indication
(fixed resistor
inside the
battery pack)
3 GND GND Ground
RM-10;RM-24
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