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Mitsubishi Electric PH440 User Manual: Motherboard Power; Processor Power; Battery; Power Management

Pentium ii processor-based nlx profile motherboard.
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P H 4 4 0 N L X M o t h e r b o a r d U s e r G u i d e

MOTHERBOARD POWER

Processor Power

A voltage regulator conforming to the Intel VRM8.2 standard supplies power for the processor
core. The motherboard automatically selects the correct processor voltage.

Battery

An IEC-type CR2032 3V lithium coin cell and holder are fitted to the board. Note that when the
motherboard is powered off but the AC remains connected (the standby rail is active) the battery
is not used.

POWER MANAGEMENT

Standby Switch

The motherboard supports an ACPI-compliant standby switch for use with a soft-switch power
supply. The action of the switch is under a combination of hardware and software control and is
summarised in the table below. The motherboard will power off regardless of the state of
software if the switch is held down for more than 4 seconds.
State
Standby (soft power off)
POST, DOS or APM O/S

Behaviour After AC-Disconnect

The 'Wake on AC connect' BIOS option and the state of the lithium cell determine the
behaviour of the motherboard after an AC-disconnect. The table below describes this.
Conditions
CMOS RAM cleared. This is the state of a
new motherboard before assembly. This also
occurs after battery removal or failure.
CMOS RAM not cleared and 'Wake on AC
connect' was set to 'Enabled'.
CMOS RAM not cleared and 'Wake on AC
connect' was set to 'Disabled'. This is the
default state. Resume events will be lost if an
AC power failure occurs.

Sleep State Indication

Indication of system activity states is provided by the signal 'STANDBY_LED#' to the NLX
riser (pin B159). If this signal is asserted (low) then the system is in a power-managed state. The
implementation of coloured LEDs to indicate system power states is dependent on the NLX riser
used.
MITSUBISHI ELECTRIC MOTHERBOARD DIVISION
Action after switch pressed
Machine powers up and executes POST
Machine powers off into standby state
Action on AC Reconnect
Motherboard waits for standby switch
to be pressed.
Motherboard fully powers up without
intervention.
Motherboard waits for standby switch
to be pressed.
S e p t e m b e r 1 9 9 8
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