CCS Technical Documentation Engine module
Company confidential RH-18/36/38
Issue 1 10/03 Nokia Corporation. Page 11
mode UEM enters RESET mode (after 20ms delay), if any of following statements is true
(logical OR –function):
– Power_on button detected (PWROFFX)
– charger connection detected (VCHARDET)
– RTC_ALARM detected
The Phone enters POWER_OFF mode from all the other modes except NO_SUPPLY if
internal watchdog elapses.
Acting Dead
If the phone is off when the charger is connected, the phone is powered on but enters a
state called”Acting Dead”, in this mode no RF parts are powered. 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
In the active mode the phone is in normal operation, scanning for channels, listening to
a base station, transmitting and processing information. There are several sub-states in
the active mode depending on if the phone is in burst reception, burst transmission, if
DSP is working etc.
In active mode the RF regulators are controlled by SW writing into UEM’s registers
wanted settings: VR1A/B must be kept disabled. VR2 can be enabled or forced into low
quiescent current mode. VR3 is always enabled in active mode. VR4 -VR7 can be enabled,
disabled or forced into low quiescent current mode.
Table 2: Regulator controls
Regulator NOTE
VFLASH1 Enabled; Low Iq mode during sleep
VFLASH2 Disabled
VANA Enabled; Disabled in sleep mode
VIO Enabled; Low Iq mode during sleep
VCORE Enabled; Low Iq mode during sleep
VSIM Controlled by register writing.
VR1A Enabled; Disabled in sleep mode
VR1B Disabled
VR2 Controlled by register writing; Enabled in sleep mode
VR3 Enabled; Disabled in sleep mode
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