Nokia 3105 Servicehandbuch
RH-48
Troubleshooting — BB
CCS Technical Documentation
Page 8
©
2003 Nokia Corporation Confidential
Issue 1 11/2003
and UEM enters into reset sequence.
If VBAT is detected to fall below V
MSTR
during start-up charging, charging is cancelled. It
will restart if new rising edge on VCHAR input is detected (VCHAR rising above VCH
DET+
).
RTC alarm power up
If phone is in POWER_OFF mode when RTC alarm occurs the wake-up procedure. After
baseband is powered on, an interrupt is given to MCU. When RTC alarm occurs during
ACTIVE mode, the interrupt for MCU is generated.
baseband is powered on, an interrupt is given to MCU. When RTC alarm occurs during
ACTIVE mode, the interrupt for MCU is generated.
Power off
The Baseband switch power-off mode if any of following statements is true:
• Power key is pressed
• Battery voltage is too low (VBATT < 3.2 V)
• Watchdog timer register expires
The Power-down procedure is controlled by the UEM.
Power Consumption and Operation modes
In the POWER-OFF mode, the power (VBAT) is supplied to UEM, buzzer, vibra , LED, PA
and PA drivers (Tomcat and Hornet). During this mode, the current consumption on this
mode is approximately 35uA.
mode is approximately 35uA.
In the SLEEP mode, both processors, MCU and DSP, are in stand-by mode. Phone will go
to sleep mode only when both processors make this request. When SLEEPX signal is
detected low by the UEM, the phone enters SLEEP mode. VIO and VFLASH1 regulators are
put into low quiescent current mode, VCORE enters LDO mode, and VANA and VFLASH2
regulators are disabled. All RF regulators are disabled during SLEEP mode. When SLEEPX
signal is detected high by the UEM, the phone enters ACTIVE mode and all functions are
activated.
detected low by the UEM, the phone enters SLEEP mode. VIO and VFLASH1 regulators are
put into low quiescent current mode, VCORE enters LDO mode, and VANA and VFLASH2
regulators are disabled. All RF regulators are disabled during SLEEP mode. When SLEEPX
signal is detected high by the UEM, the phone enters ACTIVE mode and all functions are
activated.
The sleep mode is exited either by the expiration of a sleep clock counter in the UEM or
by some external interrupt, generated by a charger connection, key press, headset con-
nection, etc.
by some external interrupt, generated by a charger connection, key press, headset con-
nection, etc.
In sleep mode, VCTCXO is shut down and 32 kHz sleep clock oscillator is used as refer-
ence clock for the baseband.
ence clock for the baseband.
The average current consumption of the phone in sleep mode can vary depending mainly
on SW state (e.g., slot cycle 0, 1, or 2 and if the phone is working on IS95 or IS2000 for
CDMA); however, on average is about 6 mA in slot cycle 0 on IS95.
on SW state (e.g., slot cycle 0, 1, or 2 and if the phone is working on IS95 or IS2000 for
CDMA); however, on average is about 6 mA in slot cycle 0 on IS95.
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