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11#
发表于 2010-7-17 18:10:14
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只看该作者
来自: 江苏苏州 来自 江苏苏州
3V3AUX (Pin 2)
Connect this pin to the 3V3DUAL output. In sleep states, the
voltage at this pin is regulated to 3.3V through an internal
pass device powered from 5VSBY through the VCC pin. In
active states, ATX 3.3V output is delivered to this node
through a fully-on NMOS transistor. During S3 and S4/S5
states, this pin is monitored for undervoltage events.
DLA (Pin 6)
This pin is an open-drain output. A 1kΩ resistor must be
connected from this pin to the ATX 12V output. This resistor
is used to pull the gates of suitable N-MOSFETs to 12V,
which in active state, switch in the ATX 3.3V and 5V outputs
into the 3.3VAUX and 5VDUAL outputs, respectively. This pin
is also used to monitor the 12V rail during POR. If a resistor
other than 1kΩ is used, the POR level will be affected. |
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