Power Distribution; Power Key - Nokia RX-44 Service Manual

RX-44
System Module

Power key

The system boots up when power key is pressed (adequate battery voltage, VBAT, present).
Power down can be initiated by pressing the power key again (the system is powered down with the aid of
SW).

Power distribution

Generally, RX-44 EM architecture is implemented with three EM ASICs, EM ASIC Vilma D1420, EM ASIC Betty
N1310 and EM ASIC Menelaus N4200 controlling the EM and supplying the output voltages.
In addition to the ASICs, N5351 PM ASIC handles the power supply for HS USB controller.
In addition to mentioned EM ASICs, RX-44 EM includes functionalities to be powered using discrete regulator
or direct battery voltage supply.
The following functionality is supplied with discrete power supplies:
• LCD analog Supply (2.8V)
• System clock oscillator
• eMMC core (3.0V) and IO (1.8V)
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