User Guide

PAMS
Technical Documentation
NSE–8/9
System Module
Page 2– 38
Issue 1 07/99
asked and if yes, asks it
4.6 MCU starts communicating with the world
5. POWER ON/RTC:
– BB regulator active
– VCXO regulator active
– COBBA–analog regulator active
– SIM regulator active
– MAD controls the system
– power on indicated to the user
In the end of this power up procedure the phone is in ”POWER ON/RTC”
state where it will indicate the alarm to the user by beeps and/or display
information. It shall be noted that the RF part of the phone is not turned on
in this state in order to disable the transmissions not controlled by the
user. How the phone changes state from ”POWER ON/RTC” state to
normal operational mode is a matter of MCU SW and UI SW
specifications.
Power Down Schemes
There are four ways to power down the phone:
1. by pressing power on/off button,
2. by letting the CCONT watchdog expire,
3. by letting the battery voltage drop below the operation limit (either by
not charging the battery or by removing it)
4. by removing the charger (in ”POWER ON/ACTING DEAD” state
only).
Power button initiated power down procedure
0. INITIAL CONDITIONS: ANY OPERATIONAL STATE
1. POWER BUTTON PRESSED (FOR POWER OFF):
1.1 MCU SW detects that power button is pressed long enough to
start power down procedure
1.2 MAD2PR1 (MCU SW) updates and disconnects SIM, close
down network and UI connections
2.a IF CHARGER CONNECTED (CCONT_INT ACTIVE ) THEN GO TO
”POWER ON ACTING DEAD” STATE:
– BB regulator active
– VCXO regulator active
– COBBA–analog regulator active
– MAD controls the system and the charging
2.b ELSE SEND POWER OFF COMMAND TO CCONT:
2.b.1 MAD sends power off command (writes short delay to WDOG)
3. POWER DOWN THE SYSTEM
3.1 CCONT waits until the watchdog expires