Power Off; Power Consumption And Operation Modes - Nokia 1265 Description And Troubleshooting

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above 3.0V (min. MSM operation voltage), code start running on MSM. The MSM
reads PM registers to identify the power source and whether battery charging is
required. If a valid supply voltage is applied while the PM is on, the power-on
sequence is skipped. A charging sequence will then be initiated.

Power Off

While the PS_HOLD signal from the MSM is high, and the PM is in one of its
power-on states. Under this condition, the PM continually monitors three events that
could trigger a power-off sequence:
The MSM drives the PS_HOLD signal low responding to the pressing of the
keypad power button.
Battery voltage drops below power off threshold (Battery voltage < 3.2 V).
The PM die temperature exceeds its "severe" over-temperature threshold.

Power Consumption and Operation Modes

Power-off Mode
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.
Sleep Mode
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.
Active Mode
In active mode, the mobile terminal operates normally. It scans 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 reception, burst transmission, etc.
Issue 1 04/2007 © 2007 Nokia Corporation
Baseband Description and Troubleshooting
Company Confidential
1265 (RH-103)
Page 7