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System thermal alarm. System thermal rating is obtained by the a thermal sensor aside
charger and signaled by the pin-64(SM5_THERM_SYS) of SMC. Full charge to battery is
only available when the system temperature is less than 56°C while trickle charge higher than
58°C. System shutdown will be automatically executed while temperature is higher than
85°C.
1.5.7.3 Suspend
There are two forms of suspend and resume on the notebook, static suspend(suspend-to-memory)
and zero-volt suspend(suspend-to-disk).
condition. The entire computer state is saved to a disk file and the computer is turned off. In
static suspend, all components are placed into an idle state and the clocks are stopped to the
entire machine, except for the 32 kHz clock for memory refresh.
In either case, all separate components in the system are put into their lowest power state at the
start of either suspend process.
1. Devices turned off. The HDD(except for suspend-to-disk since the file goes there), CD-
ROM, floppy are turned off at the start of any suspend.
2. Devices brought to a low power state. The modem, audio, serial port transceiver
(MAX213), SIR, keyboard controller, PCMCIA controller chip will be put into a low power state
instantly through a pin asserting or prematurely expiring the device timer.
3. Devices zero-clocked. Since the remainder of the devices (video, CPU, IDE controller, ISA
bus, 87336's devices (serial and floppy)) are, by design, static devices, their lowest power
states are achieved by removing the clock to the device.
The very act of going into a suspend-to-memory means that the enable pin to the clock generator
chip is deasserted, removing all but the 32 kHz signal from the board. This excludes, however,
the clocks dedicated to the internal modem. They will remained powered and oscillating.
For suspend-to-disk, all devices are read, saved to local memory and the local memory, video
memory are saved to a disk file which is created by SLEEP MANAGER utility. The machine is
then commanded to an off state.
•
Resume events for zero-volt suspend(suspend-to-disk)
The only resume event for zero-volt suspend is the raising of the lid of the computer. This
electronically enables the power to the rest of the machine.
•
Resume events for static suspend(suspend-to-memory)
1.
Resume on modem ring. This is set in BIOS Setup in the power management section.
Enabling of this field to any ring count will disable the suspend to function, except for
battery very low.
2.
Resume on schedule. In BIOS Setup, this time field can be enabled then set to any
value. It is possible to set it for a date and time in the past. In this case, the unit will
resume at the next occurrence of the specified time, date ignorant. If a proper future
date is specified, then the resume will only happen long enough to evaluate the date and
the machine will re-suspend. After a successful resume has taken place, the resume on
schedule field will automatically disable. . Enabling of this field will disable the suspend-
to-disk function, except for battery very low. The auto-disable of resume on schedule
Zero-volt suspend is, as the name implies, an OFF
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