W83627DHG-PT Nuvoton Technology Corporation of America, W83627DHG-PT Datasheet - Page 189

• Manufacturer Part Number: W83627DHG-PT
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of W83627DHG-PT

• Pin Count: 128
• Lead Free Status / RoHS Status: Compliant

To ensure that VCC does not fall faster than VSB in various ATX Power Supplies, the W83627DHG-P adds the
option of “user define mode” for the pre-defined state before AC power failure. BIOS can set the pre-defined state
to be “On” or “Off”. According to this setting, the system is returned to the pre-defined state after the AC power
recovery.
The W83627DHG-P generates a low pulse through the PSOUT# pin to wake up the system when it
detects a key code pressed or mouse button clicked. The following sections describe how the
W83627DHG-P works.
15.2.1 Waken up by Keyboard events
The keyboard Wake-Up function is enabled by setting Logical Device A, CR [E0h], bit 6 to “1”.
There are two keyboard events can be used for the wake-up
1) Any key – Set bit 0 at Logical Device A, CR [E0h] to “1” (Default).
2) Specific keys (Password) - Set bit 0 at Logical Device A, CR [E0h] to “0”.
Three sets of specific key combinations are stored at Logical Device A. CR [E1h] is an index register
to indicate which byte of key code storage (0x00h ~ 0x0Eh, 0x30h ~ 0x3Eh, 0x40h ~ 0x4Eh) is going
to be read or written through CR [E2h]. According to IBM 101/102 keyboard specification, a complete
15.2 Wake Up the System by Keyboard and Mouse
Figure 15-3 The previous state is “on” - 3VCC falls to 2.6V and SUSB# keeps at 2.0V
3VCC
SUSB#
Logical Device A, CR[E6h]
Note 2.
Figure 15-4
3VCC
SUSB#
bit [4]
0
1
The previous state is “off” - 3VCC falls to 2.6V and SUSB# keeps at 0.8V
W83627DHG-P/W83627DHG-PT
User defines the state to be “on”
User defines the state to be “off”
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Publication Release Date: July 09, 2009
Definition
Version 1.94