User Guide

CCS Technical Documentation System Module
NPM-2NX
Issue 1 07/02 ãNokia Corporation Page 19
PWM signal which controls the frequency and pulse width of signal of the buzzer. The
buzzer has spring contacts to PWB.
Technical information
Rated input voltage is 3.6V and resonance frequency is 2700Hz. The size of the buzzer is
11mm x 10.2mm x 2.2mm without a gasket. For more detailed specification see data
sheets under material code 5140229.
Battery
Phone battery
Introduction
Li-Ion 1000mAh battery BLB-3 is used in NPM-2NX by default. There is also possible use
BLB-2 (Li-Ion 750mAh) battery. Its thickness and capacity is smaller. Even though its
thickness is smaller it fits electrically and mechanically in NPM-2NX.
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. NTC-resistor measures the battery temperature. Temperature &
capacity information is needed for charge control. These resistors are connected to BSI
and BTEMP pins of battery connector. Phone has pull-up resistors (R202 and R203) for
these lines so that they can be read by A/D inputs in the phone. Dual resistor R205 is esd
protection. These can be left out if the protection of UEM itself is enough. There are also
spark caps in the battery lines to prevent esd. There is also EMI-filter between VBAT and
battery connector for EMC. See schematic.
Figure 6: Battery connection diagram
Batteries have a specific red line which indicates if the battery has been subjected to
excess humidity. The batteries are delivered in a protection mode, which gives longer
UEM
VFLASH1VANA VBAT
1n
C217
10R
R205/2
1n
C220
10R
R205/1
100k
R203
OVERCHARGE/
OVERDISCHARGE
PROTECTION
Li-Ion
VBATT
BSI
GND
BTEMP
Battery
connector
100k
R202
10p
C108
10p
C109