Battery Temperature - Nokia Mobile Phones NSE-5 Series Service Manual

NSE–5
System Module
The battery identification line is used also for battery removal detection.
The BSI line is connected to a SIMCardDetX line of MAD2 (D200).
SIMCardDetX is a threshold detector with a nominal input switching level
0.85xVcc for a rising edge and 0.55xVcc for a falling edge. The battery
removal detection is used as a trigger to power down the SIM card before
the power is lost. The BSI contact in the battery pack is made 0.7mm
shorter than the supply voltage contacts so that there is a delay between
battery removal detection and supply power off,
Vcc
0.85 0.05 Vcc
0.55 0.05 Vcc
SIMC
GND

Battery Temperature

The battery temperature is measured with a NTC inside the battery pack.
The BTEMP line inside transceiver has a 100k pullup to VREF. The MCU
can calculate the battery temperature by reading the BTEMP line
DC–voltage level with a CCONT (N100) A/D–converter.
BATTERY
Page 2 – 28
D X
ARD ET
BVOLT
BSI
BTEMP
R
T
1k
NTC
BGND
Figure 11. Battery Temperature
Technical Documentation
S O
IG UT
TRANSCEIVER
VREF
Vibra Schematic
100k
10k
BTEMP
2k2
10n
VibraPWM
MCUGenIO4
Issue 1 07/99
PAMS
CCONT
MAD