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WT8046N24P1

Synchronous Signal Discriminator with Power Saving Detector and Test Pattern for Green Monitor

Weltrend Semiconductor 

WT8046

Synchronous Signal Discriminator with Power Saving

Detector and Test Pattern for Green Monitor



APPLICATION DESCRIPTION

DPMS (Display Power Management Signaling) Detection

As per DPMS proposal version 1.0P, revision 0.54P, WT8046 provides Monitor Power

Management Detection Circuit for the convenience of monitor designers in designing power

saving monitors, or the so called "Green Monitors". Please refer to the table 1 as below for

power states defined in the DPMS.

DPMS requires at least 5 seconds delay before transition from ON state to any power saving

state, to avoid unintentionally entering a power saving state during display resolution changes

and timing mode changes. And it can be done instantaneously, for the transition between any

power saving state.

Table 1 Display Power Management Summary

State

On

Stand-by

Suspend

Off

Signals

Horizontal Vertical Video

Pulses Pulses Active

No Pulses Pulses Blanked

Pulses No Pulses Blanked

No Pulses No Pulses Blanked

DPMS

Compliance

Requirement

Mandatory

Optional

Mandatory

Mandatory

Power

Savings

None

Minimal

Substantial

Maximum

Recovery

Time

Not

Applicable

Short

Longer

System

Dependent

* "No-Pulse" represents the frequency of Hsin or Vsin less than or equal to 10Hz, but

"Pulses" represents that frequency of Hsin greater than or equal to 10KHz and Vsin

greater than or equal to 40Hz



Weltrend Semiconductor, Inc.

2F., No. 24, Industry E. 9th Rd.

Science-Based Industrial Park

Hsin-Chu, Taiwan, R.O.C.

Tel: 886-35-780241

Fax: 886-35-770419

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