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WT8048N2 Schematic ( PDF Datasheet ) - ETC

Teilenummer WT8048N2
Beschreibung DPMS (Display Power Management Signaling) Detector for Green Monitor
Hersteller ETC
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Gesamt 10 Seiten
WT8048N2 Datasheet, Funktion
eltrend
WT8048
DPMS (Display Power Management
Signaling) Detector for Green Monitor
Aug. 31, 1995
DESCRIPTION
The WT8048 is a 8 pin P-DIP package IC, designed for the application of Power Saving
Monitor or Green Monitor.
As per DPMS proposal, the WT8048 provides a detective circuit of monitor power
management for the convenience of designers in designing Power Saving Monitor.
FEATURES
{ Accepting two seperated H&V synchronous signals with positive/ negative polarity.
{ Capable of processing horizontal frequency between 0Hz to 100kHz, and vertical
frequency between 0Hz to 100Hz.
{ Power Saving mode - It can detect the conditions of monitor to decide which will be
selected as following: ON mode / STAND_BY mode / SUSPEND mode / OFF mode.
{ An Override mode is defined to override the DPMS function during the design, test,
burn-in manufacture or diagnostic process if desired.
APPLICATION
{ DPMS mode's detection for Green Monitor
Weltrend Semiconductor, Inc.
2F., No. 24, Ind. E. 9th Rd., Science-Based Ind. Park,
Hsin-Chu, Taiwan, R. O. C.
Tel: 886-35-780241 Fax: 886-35-7704191






WT8048N2 Datasheet, Funktion
eltrend
WT8048
APPLICATION DESCRIPTION
DPMS (Display Power Management Signaling) Dection
As per DPMS proposal WT8048 provides Monitor Power Management Detection Circuit for
the convenience of monitor designers in designing power saving minitors, 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 resoultion changes
and timing mode changes. And it can be done instaneously, for the transition between any
power saving state.
State
On
Stand-By
Suspend
Off
Table 1 Display Power Management Summary
Signals
DPMS
Power
Horizontal Vertical
Video
Compliance
Requirement
Savings
Pulse
Pulses Active Mandatory None
No Pulses Pulses Blanked
Pulse No Pulses Blanked
No Pulses No Pulses Blanked
Optional
Mandatory
Mandatory
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 15KHz
(WT8048), 10KHz (WT8048N1 / N2 / N3 / N4) and Vsin greater than or equal
to 40Hz.
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