User Guide

6015/6015i/6016i/6019i (RH-55), 6012 (RM-20)
Troubleshooting - Baseband Nokia Customer Care
Page 10 ©2004 Nokia Corporation Company Confidential Issue 1 - Revision 002 09/2004
forces the VCHAR input to rise above the charger detection threshold (VCH
DET+
) and by
detection charging is started. The UEM generates 100 mA constant output current from
the connected charger's output voltage. The battery’s voltage rises as it charges, and
when the VBAT voltage level is detected to be higher than the master reset threshold
limit (V
MSTR+
), the START_UP charge is terminated.
Monitoring the VBAT voltage level is done by the charge control block (CHACON). A
MSTRX='1' output reset signal (internal to the UEM) is given to UEM's RESET block when
VBAT>V
MSTR+
and the UEM enter into the 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 the VCHAR input is detected (VCHAR rising above
VCH
DET+
).
Power Up - RTC Alarm
If phone is in POWER_OFF mode when an RTC alarm occurs, a wake-up procedure begins.
After the baseband is powered ON, an interrupt is given to the MCU. When an RTC alarm
occurs during ACTIVE mode, an interrupt is generated to the MCU.
Power Off
The baseband switches into power off mode if any of following occurs:
• Power key is pressed
• Battery voltage is too low (VBATT < 3.2 V)
• Watchdog timer register expires
The UEM controls the power down procedure.
Power Consumption and Operation Modes
Power Off
During power off mode, power (VBAT) is supplied to the UEM, BUZZER, VIBRA, LED, PA
and PA drivers. During this mode, the current consumption is approximately 35 uA.
Sleep Mode
In sleep mode, both processors (MCU and DSP) are in stand-by mode. The phone enters
sleep mode only when both processors make this request. When the SLEEPX signal is
detected low by the UEM, the phone enters SLEEP mode. The VIO and VFLASH1
regulators are put into low quiescent current mode, VCORE enters LDO mode, and the
VANA and VFLASH2 regulators are disabled. All RF regulators are disabled during SLEEP
mode. When the UEM detects a high SLEEPX signal, 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 (a charger connection, key press, headset connection, etc.).