W83627UHG Nuvoton Technology Corporation of America, W83627UHG Datasheet - Page 151

• 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],
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.
Logical Device A, CR[E6h]
Note 2.
AC Power Failure Resume
5VCC
SUSB#
BITS[6:5]
5VCC
SUSB#
00
01
10
11
The previous state is “on”, if 5VCC falls to 3.75V and SUSB# keeps at 2.0V.
The previous state is “off”, if 5VCC falls to 3.75V and SUSB# keeps at 0.8V.
bit [4]
0
1
Table 13-1 Bit Map of Logical Device A, CR[E4h], bits [6:5]
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)
User defines the state to be “on”
User defines the state to be “off”
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DEFINITION
Definition
W83627UHG