Battery Temperature - Nokia NSB-7 Series Service Manual

NSB-7
System Module
tacts 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
GND

Battery Temperature

The battery temperature is measured with a NTC inside the battery pack. The BTEMP line
inside transceiver has a 100k pull-up to VREF. The MCU can calculate the battery tem-
perature by reading the BTEMP line DC-voltage level with a CCONT (N100) A/D-con-
verter.
Pin Name Min
3 BTEMP 0
2.1
5
-5
Page 18
SIMCARDDETX
Figure 7: SIMCardDetX Detection Levels
Typ Max Unit
1.4 V
3 V
10 20 ms
47 Kohm
5 %
ãNokia Mobile Phones Ltd.
PAMS Technical Documentation
SigOut
Notes
Battery temperature indication 100k pull-up
resistor to VREF in phone
Battery package has NTC pull-down resistor: 47k
+/-5%@+25C, B=4050 +/-3%
Phone power up by battery (input)
Power up pulse width
Service battery value
100k pull-up resistor tolerance
Issue 1 06/00