PAMS Technical Documentation
System Module
NSB-7
Issue 1 06/00
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Nokia Mobile Phones Ltd.
Page 19
Figure 8: Standard Battery BTEMP connection
Based on 47 kohm ± 5 % NTC with B = 4090 ±1.5 %. Without any alignment, with that
and 1 % pull-up resistor, ± 2.5 _C accuracy is achieved between - 20 and +60 _C (± 3.5
_C @ -40 ... +85 _C).
Supply Voltage Regulators
The heart of the power distribution is the CCONT. It includes all the voltage regulators
and feeds the power to the whole system. The baseband digital parts are powered from
the VBB regulator which provides 2.8V baseband supply. The baseband regulator is active
always when the phone is powered on. The VBB baseband regulator feeds MAD and
memories, VCORE for MAD core, COBBA digital parts and the LCD driver in the UI section.
There is a separate regulator for a SIM card. The regulator is selectable between 3V and
5V and controlled by the SIMPwr line from MAD to CCONT. The COBBA analog parts are
powered from a dedicated 2.8V supply VCOBBA. The CCONT supplies also 5V for RF and
for flash VPP.
The CCONT contains a real time clock function, which is powered from a
RTC backup when the main battery is disconnected. The RTC backup is rechargable poly-
acene battery. The battery is charged from the main battery voltage by the CHAPS when
the main battery voltage is over 3.2V.
Operating Mode
Vref
RF REG
VCOBBA
VBB
VSIM
SIMIF
Vcore
Power off
Off
Off
Off
Off
Off
Pull-down
Off
Power on
On
On/Off
On
On
On
On/Off
On
Reset
On
Off
VR1 On
On
On
Off
Pull-down
On
Sleep
On
Off
Off
On
On
On/Off
On
100k
VREF
TRANSCEIVER
R
T
BATTERY
BTEMP
BGND
BSI
VBATT
NTC
BTEMP
CCONT
10k
