Table 14 Nominal voltages
Voltage Voltage [V] Notes
Battery voltage 4.2 Maximum voltage
Cutoff voltage (SW) 3.2 EM SW controlled
Cutoff voltage (HW) 2.7 Gaia EM ASIC controlled
Backup battery voltage 3.2
Typical voltage.
Capacity 15uAh.
Power key and system power-up
After inserting the main battery, regulators started by HW are enabled. SW checks if there is some reason to
keep the power on. If not, the system is set to power off state by watchdog.
Power-up can be caused by the following reasons:
•
Power key is pressed
•
Charger is connected
•
RTC alarm occurs
•
MBUS wakeup
APE engine is the master that handles the device start-up. After the APE side is up it can release the CMT side
from reset state.
Figure 50 APE and CMT control signals and interfaces
RX-51
System Module
Issue 1 COMPANY CONFIDENTIAL Page 6 –9
Copyright © 2009 Nokia. All rights reserved.
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