Switched Mode Supply Vsim; Power Up And Power Down; Power Up With A Charger - Nokia NSM-3 Series Technical Documentation Manual

PAMS Technical Documentation

Switched Mode Supply VSIM

There is a switched mode supply for SIM–interface. SIM voltage is se-
lected via serial IO. The 5V SMR can be switched on independently of the
SIM voltage selection, but can't be switched off when VSIM voltage value
is set to 5V.
NOTE: VSIM and V5V can give together a total of 30mA.
In the next figure the principle of the SMR / VSIM–functions is shown.
VBAT
VSIM

Power Up and Power Down

The baseband is powered up by:
1.
2.
3.
4.

Power up with a charger

When the charger is connected CCONT will switch on the CCONT digital
voltage as soon as the battery voltage exeeds 3.0V. The reset for
Issue 4 02/2002
CCONT
V5V_4
V5V_3
V5V_2
5V reg
V5V
Pressing the power key, that generates a PWRONX interrupt
signal from the power key to the CCONT, which starts the pow-
er up procedure.
Connecting a charger to the phone. The CCONT recognizes
the charger from the VCHAR voltage and starts the power up
procedure.
A RTC interrupt. If the real time clock is set to alarm and the
phone is switched off, the RTC generates an interrupt signal,
when the alarm is gone off. The RTC interrupt signal is con-
nected to the PWRONX line to give a power on signal to the
CCONT just like the power key.
A battery interrupt. Intelligent battery packs have a possibility
to power up the phone. When the battery gives a short (10ms)
voltage pulse through the BTEMP pin, the CCONT wakes up
and starts the power on procedure.
E Nokia Corporation
External
NSM–3/3D
System Module
5V
5/3V
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