User Guide

RM-11
System Module CC Technical Documentation
Page 10 ©2004 Nokia Corporation Confidential Issue 1 02/2004
Temperature and capacity information is needed for charge control. These resistors are
connected to the BSI and BTEMP pins of the battery connector. The phone has 100 kW
pull-up resistors for these lines so that they can be read by A/D inputs in the phone. For
safety reasons, the phone software will shut the phone off if it senses a temperature of
38
o
C or higher on the BTEMP line.
Figure 4: Interconnection diagram
Supply Voltage Regulation
The UEM ASIC controls supply voltage regulation. There are six separate regulators used
by the baseband block. For a more detailed description about the regulator parameters,
see the UEM ASIC Specification document.
Charging
The RM-11 baseband supports the NMP charger interface specified in the Janette
Charger Interface document. SW control is specified in the EM SW Specification, ISA EM
Core SW Project document. The UEM ASIC controls charging, and external components
are used to provide EMC, reverse polarity, and transient protection of the charger input
to the baseband module. The charger connection is through the system connector inter-
face. Both 2- and 3-wire type chargers are supported. The operation of the charging
circuit has been specified to limit the power dissipation across the charge switch and to
ensure safe operation in all modes.
Table 3: BSI resistor values
Parameter Min Typ Max Unit Notes
Battery size indicator resistor BSI 75 kΩ Battery size indicator (BLD-3)
Tolerance “1%
NTC thermistor BTEMP 47
4000
kΩ
K
Battery temperature indica-
tor (NTC pulldown) 47kΩ“5%
@ 25
o
C
Beta value (B).
Tolerance “5%, 25
o
C / 85
o
C
Overcharge /
Overdischarge
protection
VBATT
BSI
BTEMP
EMC
Li-Ion