FDC37B78X 查看數據表（PDF） - SMSC -> Microchip

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FDC37B78X

Enhanced Super I/O Controller with ACPI Support, Real Time Clock and Consumer IR

SMSC -> Microchip 

SOFT POWER MANAGEMENT

This chip employs soft power management to

allow the chip to enter low power mode and to

provide a variety of wakeup events to power up

the chip. This technique allows for software

control over powerdown and wakeup events. In

low power mode, the chip runs off of the trickle

voltage, VTR. In this mode, the chip is ready to

power up from either the power button or from

one of a number of wakeup events including

pressing a key, touching the mouse or receiving

data from one of the UARTs. The alarm can

also be set to power up the system at a

predetermined time to perform one or more

tasks.

The implementation of Soft Power Management

is illustrated in Figure 11. A high to low

transition on the Button input or on any of the

enabled wakeup events (SPx) causes the

nPowerOn output to go active low which turns

on the main power supply. Even if the power

supply is completely lost (i.e., VTR is not

present) the power supply can still be turned on

upon the return of VTR. This is accomplised by

an alarm event that has already passed (if the

alarm remember bit is enabled) or by a VTR

power on reset (if the VTR POR bit is enabled).

These bits are described in the RTC section.

The chip can also be programmed to always

stay off when the AC power returns. (See

VTR_POR_OFF in the RTC section.)

The Button input can be used to turn off the

power supply after a debounce delay. The

power supply can also be turned off under

software control (via a write to register

WDT_CTRL with bit 7 set).

Configuration registers L8-CR_B0 and L8-

CR_B1 select the wakes-up events (SPx). The

Configuration registers L8-CR_B2 and L8-

CR_B3 indict the wake-up event status. The

possible wake-events are:

• UART1 and UART 2 Ring Indicator Pin

• Keyboard and Mouse clock Pin

• Group Interrupt 1, Group Interrupt 2

• IRRX2 input pin

• RTC Alarm

• UART 1 and UART 2 Receive Data Pin

• nRING pin

• Consumer IR (CIR)

• Power Button input pin

• VTR_POR

148

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