Voltage Limits; Audio Function Description - Nokia RH-64 Service Manual

RH-64
System module
• No supply: In NO_SUPPLY mode, the phone has no supply voltage. This mode is due to disconnection of main
battery or low battery voltage level in battery. Phone is exiting from NO_SUPPLY mode when sufficient battery
voltage level is detected. Battery voltage can rise either by connecting a new battery with VBAT > VMSTR+ or
by connecting charger and charging the battery above VMSTR+.
• 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. 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.
• 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 etc. One of the sub-states of the active
mode is FM radio on state. In that case, Audio Amplifier and FM radio are powered on. FM radio circuitry is
controlled by the MCU and 32kHz-reference clock is generated in the UPP. BBLite supports also the MIC3 audio
path enabling also in the sleep mode allowing for example the FM radio listening during sleep mode. This
requires that the FM radio work with 32kHz sleep clock frequency.
In Active mode the RF regulators are controlled by SW writing into UEMCLite's registers wanted settings: VR
regulators can be disabled, enabled or forced into low quiescent current mode. VR2 is always enabled in
Active mode for system clock chain supply
• 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. The battery type / size is indicated by a resistor
inside the battery pack. The resistor value corresponds to a specific battery capacity. This capacity value is
related to the battery technology as different capacity values are achieved by using different battery
technology. The battery voltage, temperature, size and current are measured by the UEMCLite and controlled
by the charging software running in the UPP. The charging control circuitry (CHACON) inside the UEMCLite
controls the charging current delivered from the charger to the battery. The battery voltage rise is limited
by turning the UEMCLite switch off when the battery voltage has reached 4.2 V. Charging current is monitored
by measuring the voltage drop across a 220 mW resistor. The PWM output doesn't exist any more from
UEMCLite to the bottom connector

Voltage limits

Parameter
Vmstr+
Vmstr-
Vcoff+
Vcoff-
SW shutdown

Audio function description

Audio
The basic audio structure and communication between HW-audio modules and the audio ASIC's is illustrated
in the block diagram below.
9243363 (Issue 1)
Table 12 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!
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Value/V
2.1 ±0.1
1.9 ±0.1
3.1 ±0.1
2.8 ±0.1
3.2 V
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