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WT8045 Schematic ( PDF Datasheet ) - ETC

Teilenummer WT8045
Beschreibung Synchronous Signal Discriminator and Power Saving Detector for Green Monitor
Hersteller ETC
Logo ETC Logo 




Gesamt 25 Seiten
WT8045 Datasheet, Funktion
WT8045
Synchronous Signal Discriminator and
Power Saving Detector for Green Monitor

May 4, 1995
DESCRIPTION
The WT8045 is a silicon monolithic circuit designed for synchronous signal processing and power
saving detection of multi-sync display monitors, which can cope with many kinds of PC's and
workstations.
It can be applied to display monitors supporting standard IBM VGA, VESA super VGA and IBM
8514/A video modes. It can also be used in other high-end display monitors supporting non-standard
video modes with user-defined horizontal/vertical frequency ranges.
The WT8045 incorporates many functional circuits, including horizontal/vertical frequency
discrimination, display mode selection, and synchronous pulse polarity and power saving detection,
into this single chip IC.
WT8045 is more convenient for you to shrink the PC board size and to reduce the material and labor
cost with fewer components.
FEATURES
Accepting two separated H&V synchronous signals with positive/ negative polarity.
Support VESA VGA (640X480, 640X400, 640X350), VESA SVGA (800X600), European
SVGA (800X600), VESA new SVGA (800X600), XGA (1024X768) and 1280x1024.
Capable of processing horizontal frequency between 25KHZ to 80KHZ.
Standard IBM video mode control outputs (1024X768, 640X480, 640X400, 640X350).
Five non-standard horizontal frequency control outputs in predefined frequency range.
Power saving mode - It can detect the conditions of monitor to decide which one will be selected
as following: ON/STANDBY/SUSPEND/OFF mode.
Fixed polarity outputs on both horizontal and vertical synchronous signals.

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
1






WT8045 Datasheet, Funktion
WT8045
Synchronous Signal Discriminator and
Power Saving Detector for Green Monitor

WT8045N28P4
WT8045N28P5
OSCin
OSCout
HSin
VSin
H_out
V_out
F43.5K
F36.2K
F33K
QV128
QVRC
Vss
F52K
PM1
+PM2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28 VDD
27 1024x768(56.5K)
OSCin
OSCout
1
2
26 1024x768 (NI)
HSin
3
25 1024x768 (I)
VSin
4
24 800x600(48K)
H_out
5
23
800x600(37.5K)
V_out
6
22 800x600(35.2K) F43.5K 7
21 640x480
F36.2K
8
20 640x400
F33K
9
19 640x350
QV1 10
18 QH
QVRC
11
17 QHRC
Vss 12
16 PM3
F52K
13
15 Mute
PM1
+PM2
14
28 VDD
27 1024x768(56.5K)
26 1024x768 (NI)
25 1024x768 (I)
24 800x600(48K)
23 800x600(37.5K)
22 800x600(35.2K)
21 640x480
20 640x400
19 640x350
18 QH
17 QHRC
16 PM3
15 Mute
Note: The Hout and Vout pin of N28P1, N28P3, N28P4 and N28P5 are negative pulse.

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
6

6 Page









WT8045 pdf, datenblatt
WT8045
Synchronous Signal Discriminator and
Power Saving Detector for Green Monitor

Name
PM2
PM3
QHRC
QH
640¡ Ñ350
640¡ Ñ480
640¡ Ñ400
640¡ Ñ480
800¡ Ñ600
800¡ Ñ600
800¡ Ñ600
1024¡ Ñ
768(I)
1280¡ Ñ
1024
1024¡ Ñ
768(NI)
1024¡ Ñ
768(57k)
Vdd
Function
Indicate in SUSPEND mode
Struncure
of
Terminal
O, open drain
Indicate in OFF mode
O, open drain
Input pin, connected to Vdd through RH & to ground through CH. I
Output pin, fixed positive polarity of horizontal signal; pulse width O, open drain
depend upon RH & CH
Mode select control output, if IBM VGA 640¡ Ñ350 mode, or VESA O, open drain
VGA 640¡ Ñ350 mode. Then active "low", else open state output
VESA VGA mode 640¡ Ñ480 (37.5k/72Hz)
O, open drain
If IBM VGA 640¡ Ñ400 mode, or VESA VGA 640¡ Ñ400 mode then O, open drain
active "low" (640¡ Ñ400, 31.5k, for N24P4)
If IBM VGA 640¡ Ñ480 mode, or VESA VGA 640¡ Ñ480 mode then O, open drain
active "low" (640¡ Ñ480, 31.5k, for N24P4)
VESA super VGA mode
O, open drain
(H_SYNC = 35.2k, V_SYNC = 56Hz)
European super VGA mode
O, open drain
(H_SYNC = 37.5k, V_SYNC = 60Hz)
VESA new super VGA mode
(H_SYNC = 48k, V_SYNC = 72Hz)
O, open drain
IBM 8512/A interlace mode
O, open drain
(H_SYNC = 35.5k, V_SYNC = 86Hz)
1280¡ Ñ1024 mode control output
O, open drain
(H_SYNC = 64k, V_SYNC = 60Hz)
IBM 8514/A non-interlace mode
(H_SYNC = 48.5k, V_SYNC = 60Hz)
O, open drain
XGA 1024¡ Ñ768 mode Hsync freq. 57kHz
O, open drain
(H_SYNC = 56.5k, V_SYNC = 72Hz)
5 Volts power supply

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
12

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