Battery Temperature - Nokia NSB-6 Series Technical Documentation Manual

PAMS Technical Documentation
Vcc
0.850.05 Vcc
0.550.05 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.
Pin Name Min
3 BTEMP 0
2.1
5
–5
BATTERY
Issue 1 06/2000
D X
ARD ET
Typ Max Unit
1.4 V
3 V
10 20 ms
47 kohm
5 %
VBATT
BSI
BTEMP
R
NTC
T
BGND
E Nokia Mobile Phones Ltd.
S
IG
Notes
Battery temperature indication
100k pullup resistor to VREF in phone
Battery package has NTC pull down resis-
tor:
47k +/–5%@+25C , B=4050+/–3%
Phone power up by battery (input)
Power up pulse width
Service battery value
100k pullup resistor tolerance
TRANSCEIVER
VREF
100k
CCONT
10k
BTEMP
NSB–6
System Module
O
UT
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