SC1100 datasheet(339/348 Pages) NSC

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Electrical Specifications (Continued)

7.3.12 Power-Up Sequencing

Figure 7-49. Power-Up Sequencing Timing

ACPI is non-functional when the power-up sequence does not include using the power button. If ACPI functionality is

desired, the power button must be toggled. This can be done externally or internally. GPIO63 is internally connected to

PWRBTN#. To toggle the power button with software, GPIO63 must be programmed as an output using the normal GPIO

programming protocol (see Section 5.4.1.1 "GPIO Support Registers" on page 196). GPIO63 must be pulsed low for at

least 16 msec and not more than 4 sec.

Table 7-34. Power-Up Sequence Using the Power Button

Symbol

Parameter

Min

Max

Unit

Comments

Voltage sequence

-10

PWRBTN# inactive after VSB or VSBL

applied, whichever is applied last

µs

PWRBTN# is an input and must

be powered by VSB.

PWRBTN# active pulse width

4000

If PWRBTN# max is exceeded,

ONCTL# will go inactive.

ONCTL# inactive after VSB or VSBL

applied, which ever is applied last

Signal active after PWRBTN active

VCORE and VIO applied after ONCTL#

active

System determines when VCORE

and VIO are applied, hence there

is no maximum constraint.

POR# inactive after VCORE and VIO

applied

POR# must not glitch during

active time.

VSBL

VSB

VCORE

VIO

PWRBTN#

ONTCL#

PWRCNT[2:1]

POR#

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