NSW-5
System Module UT5U
PAMS Technical Documentation
Page 20
Issue 1 10/00
Nokia Mobile Phones Ltd.
turning on the lights. MCU–SW must start also the RF receiver parts at
this point.
V5V–regulator (for RF) default value is off in power–up, and can be con-
trolled on via serial bus when needed.
Power up when charger connected
Normal battery voltage
VCHAR
VR1, VBB, VR6,
RFC (VCXO)
COBBACLK
PURX
RFCEN
t1
t2
t3
RFCSETTLED
CCONTINT
SLCLK
V2V
The power up procedure is similar to process described in the previous
chapter with the exception that the rising edge of VCHAR triggers the
power up in CCONT.
Also CCONT sets output CCONTINT. MAD detects the interrupt, and after
that reads CCONT status register to find out the reason for the interrupt
(charger in this case). The phone will remain in the ”acting dead” state,
which means that the user interface is not activated unless the power but-
ton is pressed. Only the charging activity is indicated on the display.
CCONTINT is generated both in the case the charger is connected, and
in the case the charger is disconnected.