Nokia NSE-3 SERIES, Service Manual

Page: 33 / 217

PAMS
Technical Documentation
NSE–3
System Module
Page 3 – 27
Original 11/97
Power Up by RTC
RTC ( internal in CCONT) can power the phone up by changing RTCPwr to
logical ”1”. RTCPwr is an internal signal from the CCONT digital section.
Power Up by IBI
IBI can power CCONT up by sending a short pulse to logical ”1”. RTCPwr is
an internal signal from the CCONT digital section.
Acting Dead
If the phone is off when the charger is connected, the phone is powered
on but enters a state called ”acting dead”. To the user the phone acts as if
it was switched off. A battery charging alert is given and/or a battery
charging indication on the display is shown to acknowledge the user that
the battery is being charged.
Active Mode
In the active mode the phone is in normal operation, scanning for chan-
nels, listening to a base station, transmitting and processing information.
All the CCONT regulators are operating. There are several substates in
the active mode depending on if the phone is in burst reception, burst
transmission, if DSP is working etc..
Sleep Mode
In the sleep mode, all the regulators except the baseband VBB, VCOBBA,
and the SIM card VSIM regulators are off. Sleep mode is activated by the
MAD after MCU and DSP clocks have been switched off. The voltage reg-
ulators for the RF section are switched off and the VCXO power control,
VCXOPwr is set low. In this state only the 32 kHz sleep clock oscillator in
CCONT is running. The flash memory power down input is connected to
the ExtSysResetX signal, and the flash is deep powered down during the
sleep mode.
The sleep mode is exited either by the expiration of a sleep clock counter
in the MAD or by some external interrupt, generated by a charger con-
nection, key press, headset connection etc. The MAD starts the wake up
sequence and sets the VCXOPwr and ExtSysResetX control high. After
VCXO settling time other regulators and clocks are enabled for active
mode.
If the battery pack is disconnect during the sleep mode, the CCONT pulls
the SIM interface lines low as there is no time to wake up the MCU.
Charging
Charging can be performed in any operating mode. The charging algo-
rithm is dependent on the used battery technology. The battery type is in-