Modes Of Operation - Nokia 2608 Service Manual

RM-376
System Module and User Interface

Modes of operation

Mode
Power-off
Sleep
Active
Charging
Issue1
In power-off mode, power (VPH_PWR) is supplied to the PM, RF PA,
vibrator, and keypad backlight LED. During this mode, the current
consumption is approximately 8.8 uA
The mobile terminal enters sleep mode only when MSM makes the
request to PM through the SBI bus. PM then enters Power Saving Mode,
and the VREG_MSMC VREG_MSMP regulators remain in power-on stage.
The 32.768 kHz crystal is enabled. TCXO buffers are off. All other functions
and regulators are controlled individually via SBI and are typically
disabled for minimum power dissipation.
It exits the Sleep mode either by the expiration of a sleep clock counter
in the PM or by some external interrupt (generated by a charger
connection, key press, headset connection, etc.). The TCXO is shut down
in sleep mode and the 32.768 kHz sleep clock oscillator is used as a
reference clock for the baseband.
In active mode, the mobile terminal op
channels, listens to a base station, transmits and processes information.
There are several sub-states under the active mode. Depending on the
mobile terminal's current state, there are states such as burst
burst transmission, etc.
In active mode, this is a normal operating mode for PM. VREG_MSMC,
VREG_MSMP, VREG_MSMA, VREG_RUIM, VREG_RFRX, VREG_RFTX, and
VREG_TCXO regulators are all turned on. TCXO oscillator is enabled, and
TCXO buffers are turned on. All other functions and regulators are
controlled individually via SBI.
Charging mode can function in parallel with any other operating mode.
A BSI resistor inside the battery pack indicates the battery type/ size. The
resistor value corresponds to a specific battery capacity. The PM
measures the battery voltage, temperature, size, and charging current.
Charger control block inside the PM controls the charging current
delivered from the charger to the battery and mobile terminal. The
maximum battery voltage is limited by turning the PM switch off when
the battery voltage reaches 4.2 V. The charging current is monitored by
measuring the voltage drop across a 0.1 ohm resistor.
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Description
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