Modes Of Operation; Voltage Limits - Nokia RM-291 Service Manual

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The Audio circuit: Earpiece, IHF, internal microphone and external speaker are filtered with discrete
components (common mode reduction coils, Varistors, caps and resistors), where as the external microphone
uses differential mode mic. ASIP
The 16 UEMECLite BB & RF regulators are specified to have a decoupling cap of 1µF±20%.

Modes of operation

BB4.0 LiteV2 base band has five different functional modes.
• No supply: In NO_SUPPLY mode, the phone has no supply voltage.
• Acting Dead: If the phone is off when the charger is connected, the phone is powered on but enters a state
called "Acting Dead". To the user, the phone acts as if it was switched off.
• Active: In the Active mode the phone is in normal operation, scanning for channels, listening to a base
station, transmitting and processing information.
• Sleep: In sleep mode VCTCXO is shut down and 32 kHz sleep clock oscillator is used as reference clock for
the base band.
• Charging: Charging can be performed in any operating mode.

Voltage limits

Parameter
Vmstr+
Vmstr-
Vcoff+
Vcoff-
SW shutdown
Page 8 –8
Table 10 Voltage limits
Description
Master reset threshold (rising)
Master reset threshold (falling)
Hardware cutoff (rising)
Hardware cutoff (falling)
SW cutoff limit (> regulator drop-
out limit) MIN!
COMPANY CONFIDENTIAL
Copyright © 2007 Nokia. All rights reserved.
System module
Value/V
2.1 ±0.1
1.9 ±0.1
3.1 ±0.1
2.8 ±0.1
3.2 V
RM-291
Issue 1