User Guide

PAMS
Technical Documentation
NSE–8/9
System Module
Page 2– 6
Issue 1 07/99
Operating Modes
1. Acting Dead:
If the phone is off and the switcher is operating with the lowest
output voltage and a charger is connected, the Baseband 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.
2. Active Mode:
In the active mode the phone is in normal operation, scanning
for channels, listening to a base station, transmitting and pro-
cessing information. The switcher delivers output voltage level
depending upon whether the TX is active and on what power
level or if the TX is not active. All the CCONT regulators are
operating. There are several sub–states in the active mode de-
pending on if the phone is in burst reception, burst transmis-
sion, if DSP is working etc..
3. Deep Sleep Mode:
In the sleep mode all the regulators except, Vcobba, Vref, VBB,
(Vcore when MAD2PR1 in C07 is used) and the SIM card
VSIM regulators are off. Sleep mode is activated by the
MAD2PR1 after MCU and DSP clocks have been switched off.
The voltage regulators 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 VCXO
power control, so that the flash is deep powered down during
sleep mode.
In sleep mode the switcher supplies minimum output voltage.
The sleep mode is exited either by the expiration of a sleep
clock counter in the MAD2PR1 or by some external interrupt,
generated by a charger connection, key press, headset con-
nection etc. The MAD2PR1 starts the wake up sequence and
sets the VCXOPwr 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 shall power down the SIM in the sleep mode as there
is no time to wake up the MCU.
4. Power Off mode:
In this mode all Baseband circuits are powered off. The DC/DC
converter is still running supplying the lowest output voltage.
Thus the CCONT is powered in the same way as in usual
DCT3 products when the phone is powered off and battery re-
mains connected.