SC2200 datasheet(74/433 Pages) NSC

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Signal Definitions (Continued)

2.4.15 Power Management Interface Signals

Signal Name

Ball No.

Type

Description

Mux

EBGA

TEPBGA

CLK32

H29

AH8

32.768 KHz Output Clock

---

GPWIO0

E31

AH6

I/O

General Purpose Wakeup I/Os. These sig-

nals each have an internal pull-up of 100 K

Ω.

---

GPWIO1

G28

AK5

---

GPWIO2

G29

AJ6

---

LED#

D31

AL4

LED Control. Drives an externally connected

LED (on, off or a 1 Hz blink). Sleeping /

Working indicator. This signal is an open-

drain output.

---

ONCTL#

E30

AJ5

On / Off Control. This signal indicates to the

main power supply that power should be

turned on. This signal is an open-drain out-

put.

---

PWRBTN#

E29

AH5

Power Button. Input used by the power

management logic to monitor external sys-

tem events, most typically a system on/off

button or switch.

The signal has an internal pull-up of 100 K

Ω,

a Schmitt-trigger input buffer and debounce

protection of at least 16 ms.

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 inter-

nally 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

231). GPIO63 must be pulsed low for at least

16 msec and not more than 4 sec. Asserting

POR# has no effect on ACPI. If POR# is

asserted and ACPI was active prior to POR#,

then ACPI will remain active after POR#.

Therefore, BIOS must ensure that ACPI is

inactive before GPIO63 is pulsed low.

---

PWRCNT1

F31

AK6

Suspend Power Plane Control 1 and 2.

Control signal asserted during power man-

agement Suspend states. These signals are

open-drain outputs.

---

PWRCNT2

G31

AL7

---

THRM#

F28

AK4

Thermal Event. Active low signal generated

by external hardware indicating that the sys-

tem temperature is too high.

---

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