Issue 2 06/2005 COMPANY CONFIDENTIAL 13
Copyright © 2005 Nokia. All Rights Reserved.
RH-53/54
8-System Module Nokia Customer Care
Acting dead
This mode is just a sub mode of normal ‘Active’ mode, where everything, except for VSIM and
the RF parts, is powered up. This mode is only used for when the phone is in ‘Power off’ or ‘No
supply’ mode and a charger is connected. To the user, the phone acts as if it was switched off.
A battery-charging alert is given and/or a battery charging indication on the display is shown,
to acknowledge the user that the battery is being charged.
The phone exits from ‘Power off’ or ‘No supply’ mode, into hardware ‘Reset’ mode (not de-
scribed here), after a 20ms delay, if a charger connection is detected (VCharD-
et)(VCharIn>VCH
DET+
).
The phone then enters ‘Acting dead’ mode, after a 100ms delay, if the battery voltage rises
above V
COFF+
(sub mode of normal ‘Active’).
The phone exits ‘Acting dead’, into ‘Active’ mode, if the power on button is detected (PwrOffX).
Active
In the active mode the phone is in normal operation, scanning for channels, listening to a base
station, transmitting and processing information. There are several sub-states in the active
mode depending on if the phone is in burst reception, burst transmission, if DSP is working, if
the phone is folded or unfolded etc.
Sleep mode
The phone enters ‘Sleep’ mode when the UPP goes into standby mode and forces the UEM
into sleep mode by pulling SleepX low.
The UEM puts VCORE, VIO and VFLASH1 into sleep mode and disables VANA and all of the
RF regulators except VR2, VSIM is also put into sleep mode if supported by the SIM card. The
main oscillator (26MHz) is also shut down and the 32 kHz sleep clock oscillator is used as ref-
erence clock for the baseband.
The phone exits sleep mode when SleepX is set high by the UPP, or by expiration of a sleep
clock counter in the UEM or by some external interrupt, generated by a charger connection,
key press, headset connection etc.
Charging
Charging can be performed in parallel with any other operating mode. The charging will be con-
trolled by hardware until the phone enters either ‘Sleep’, ‘Acting dead’ or ‘Active’ mode. Here-
after it will be controlled by software.
A BSI resistor inside the battery pack indicates the battery type/size. The resistor value corre-
sponds to a specific battery capacity and technology.
The battery voltage, temperature, size and current are measured by the UEM, and controlled
by the charging software running in the UPP.
The charging control circuitry (CHACON) inside the UEM controls the charging current deliv-
ered from the charger to the battery. The battery voltage rise is limited by turning the UEM
switch off when the battery voltage has reached VBATLim (programmable charging cut-off lim-
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