W83627UHG Nuvoton Technology Corporation of America, W83627UHG Datasheet - Page 150

• Manufacturer Part Number: W83627UHG
• Description: IC I/O CONTROLLER 128-QFP
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of W83627UHG

• Applications: PC's, PDA's
• Interface: LPC
• Voltage - Supply: 3.3V, 5V
• Package / Case: 128-XFQFN
• Mounting Type: Surface Mount
• Pin Count: 128
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

13.1.2
By definition, AC power failure means that the standby power is removed. The power failure resume
control logic of the W83627UHG is used to recover the system to a pre-defined state after AC power
failure. Two control bits at Logical Device A, CR[E4h], bits[6:5] indicate the pre-defined state. The
definition of these two bits is listed in the following table:
LOGICAL DEVICE A, CR[E4H],
SUSB# (Intel Chipset)
SUSB# (Other Chipset)
PSOUT#
PSIN#
5VSB
PSON#
Note1. The W83627UHG detects the state before power failure (on or off) through the SUSB# signal and
the 5VCC power. The relation is illustrated in the following two figures.
AC Power Failure Resume
BITS[6:5]
00
01
10
11
Figure 13-2 Power Sequence from S5 to S0, then back to S5.
Table 13-1 Bit Map of Logical Device A, CR[E4h], bits [6:5]
S5 State
System always turns off when it returns from AC power
failure
System always turns on when it returns from AC power
failure
System turns off / on when it returns from power failure
depending on the state before the power failure. (Please
see Note 1)
User defines the state before the power failure. (The
previous state is set at CRE6[4]. Please see Note 2)
-135-
Publication Release Date: March 24, 2008
DEFINITION
S0 State
W83627UHG
Revision 1.44
S5 State