Battery; Phone Battery; Introduction; Interface - Nokia NKC-1X Series Technical Documentation Manual

CCS Technical Documentation

Battery

Phone Battery

Introduction

The BMC-3 battery (Ni-MH 900mAh) is be used in the NKC-1X transceiver by default. It
is also possible to use the BLC-2 (Li-ion 950mA) battery.

Interface

The battery block contains NTC and BSI resistors for temperature measurement and bat-
tery identification. The BSI fixed resistor value indicates the chemistry and default
capacity of a battery. The NTC-resistor measures the battery temperature. Temperature
and capacity information is needed for charge control. These resistors are connected to
BSI and BTEMP pins of the battery connector. The phone has pull-up resistors for these
lines so that they can be read by A/D inputs in the phone (see the figure below). Serial
resistors in the BSI and BTEMP lines are for ESD protection. Both lines also have spark
caps to prevent ESD. There is also a varistor in the BTEMP line for ESD protection.
VFLASH1
UEM
R202/2
100k
C240 R206
10n
4k7
R207
4k7
The batteries have a specific red line, which indicates if the battery has been subjected to
excess humidity (red line spreads). The batteries are delivered in the protection mode,
which gives longer storage time. The voltage seen in the outer terminals is zero (or float-
ing), and the battery is activated by connecting the charger. The battery has internal pro-
tection for overvoltage and overcurrent.
Issue 1 02/03
Figure 4: Battery Connection Diagram
Battery
VANA VBAT connector
VBATT
C101
R202/1
10p
100k
BSI
BTEMP
C220
10n
GND
Nokia Corporation
System Module
OVERCHARGE/
OVERDISCHARGE
PROTECTION
NKC-1X
Ni-MH
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