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 

Figure 11 shows the soft power management

logic with the override timer path from the

button input. The override timer counts while

the button is held (in the present implementation

this would be when the button input is high) and

is cleared upon release of the button. It has a

0.5 second or faster resolution (run off of the

32kHz clock divided down) and the minimum

time for triggering the override power down is

four seconds, with a maximum of 4.5 seconds.

The timer output will pulse the clear on the Flip

Flop 1.

Figure 12 illustrates the timing of the blanking

period relative to Button_In and nPowerOn for

the override event.

Button_In

nPowerOn

Blanking Period

4+ sec

4 sec

Release

4 sec

Vcc

FIGURE 4 - BLANKING PERIOD

151

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