Power Key - Nokia RM-42 Service Manual

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System Module

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The master reset threshold controls the internal reset of Retu / (Tahvo). If battery voltage is above VMSTR,

Tahvo's charging control logic is alive. Also, RTC is active and supplied from the main battery. Above VMSTR,

Tahvo allows the system to be powered on although this may not succeed due to voltage drops during start

up. SW can also consider battery voltage too low for operation and power down the system.

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 on key is connected to Retu ASIC via PWRONX signal.

9241872 (Issue 1)

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