Nokia NPM-6 Series Manual page 29

CCS Technical Documentation System Module and User Interface
battery temperature (BTEMP) indication.
The battery type is recognized through a resistive voltage divider. In phone there is a
100kW pull up resistor in the BSI line and the battery has a pull down resistor in the
same line. Depending on the battery type the pull down resistor value is changed. The
battery temperature is measured equivalently except that the systemboard has an NTC
pull down resistor in the BTEMP line.
KEYB1&2 inputs are used for ambient temperature sensor. These inputs are also routed
internally to the miscellaneous block.
The monitored RF function is PATEMP detection. PATEMP input is used to measure tem-
perature of the RFIC, the Helga.
ãNokia Corporation.
Issue 1 01/03 Page 29