User Guide

CC Technical Documentation System Module

NPM-10 (3595)

Power Off

In this state, the phone is powered off, but supplied. VRTC regulator is active (enabled),

having supply voltage from the main battery. Note, the RTC status in PWR_OFF mode

depends on whether RTC was enabled or not when entering PWR_OFF. From Power_off

mode, UEM enters RESET mode (after a 20 ms 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 the

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 to 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 whether the phone is in burst reception, burst trans-

mission, the DSP is working, and so on.

In active mode, the RF regulators are controlled by the 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 19: Regulator Controls

Regulator Notes

VFLASH1 Enabled; low lq mode during sleep

VFLASH2 Not used in NPM-10 (3595), must be kept disabled

VANA Enabled; disabled in sleep mode

VIO Enabled; low lq mode during sleep

VCORE Enabled; low lq mode during sleep

VSIM Controlled by register writing

VR1A Not used in NPM-10 (3595), must be kept disabled

VR1B Not used in NPM-10 (3595), must be kept disabled