View WT8045_864436.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

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
Synchronous Signal Discriminator and Power Saving Detector for Green Monitor
* Power supply voltage: DC 5 volts; but for those pins with open-drain structure, such like the mode select control output and frequency discrimination control output pins, can be connected to 12 volts through pull-high resistor.
APPLICATION
* Auto size control for Multi-Sync Display Monitors
ORDERING INFORMATION
Part No. WT8045N24P1 WT8045N24P3 WT8045N24P4 WT8045N24P5 WT8045N24P6 WT8045N24P7 WT8045N24P8 WT8045N28P1 WT8045N28P2 WT8045N28P3 WT8045N28P4 WT8045N28P5 WT8045N28P6 WT8045N28P7 WT8045N28P8 WT8045N32 Package P-DIP 24L P-DIP 24L P-DIP 24L P-DIP 24L P-DIP 24L P-DIP 24L P-DIP 24L P-DIP 28L (skinny) P-DIP 28L (skinny) P-DIP 28L (skinny) P-DIP 28L (skinny) P-DIP 28L (skinny) P-DIP 28L (skinny) P-DIP 28L (skinny) P-DIP 28L (skinny) P-DIP 32L Note V * 128 Without Mute Without Mute V*1 With Mute Without Mute With Mute V * 128 Without Mute V * 128 Without Mute V * 1 Without Mute V * 128 With Mute V * 1 With Mute V * 1 Without Mute V * 128 With Mute V * 1 With Mute --
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
2
WT8045
Synchronous Signal Discriminator and Power Saving Detector for Green Monitor
PIN CONFIGURATION
WT8045N24P1
OSCin OSCout HSin VSin H_out V_out F43.5K F36.2K F33K QV128 QVRC Vss 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 VDD
1024x768(56.5K)
WT8045N24P3
OSCin OSCout HSin VSin H_out V_out F43.5K F36.2K F33K Vss PM1 PM3 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 VDD
1024x768(56.5K)
1024x768 (NI) 1024x768 (I) 800x600(48K) 800x600(37.5K) 800x600(35.2K) 640x480 640x400 640x350 QH QHRC
1024x768 (NI) 1024x768 (I) 800x600(48K) 800x600(37.5K) 800x600(35.2K) 640x480 640x400 640x350 QH QHRC
WT8045N24P4
OSCin OSCout HSin VSin Hout Vout F36.2K F33K NC NC VSS PM1 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 VDD 1024x768 (I) 800x600(37.5K) NC 800x600(35.2K) 640x480(31.5K) 640x400(31.5K)
640x480 (37.5K/72Hz) 640x350 (31.5K/37.5K)
WT8045N24P5
OSCin OSCout HSin VSin H_out V_out F43.5K F36.2K F33K QV1 QVRC Vss 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 VDD
1024x768(56.5K)
1024x768 (NI) 1024x768 (I) 800x600(48K) 800x600(37.5K) 800x600(35.2K) 640x480 640x400 640x350 QH QHRC
NC PM3 PM2
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
3
WT8045
Synchronous Signal Discriminator and Power Saving Detector for Green Monitor
WT8045N24P6
OSCin OSCout HSin VSin H_out V_out F43.5K F36.2K F33K Vss Mute PM3 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 VDD
1024x768(56.5K)
WT8045N24P7
OSCin OSCout HSin VSin H_out V_out F43.5K F36.2K F33K Vss P52K PM1 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 VDD
1024x768(56.5K)
1024x768 (NI) 1024x768 (I) 800x600(48K) 800x600(37.5K) 800x600(35.2K) 640x480 640x400 640x350 QH QHRC
1024x768 (NI) 1024x768 (I) 800x600(48K) 800x600(37.5K) 800x600(35.2K) 640x480 640x400 640x350 PM3 PM2
WT8045N24P8
OSCin
WT8045N32
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 VDD
1024x768(56.5K)
OSCin OSCout HSin VSin H_out V_out F43.5K F36.2K F33K Vss P52K PM1+PM2
1 2 3 4 5 6 7 8 9 10 11 12
24 23 22 21 20 19 18 17 16 15 14 13
VDD
1024x768(56.5K)
OSCout HSin VSin H_out
1024x768 (NI) 1280x1024(64K) 1024x768 (I) 800x600(48K) 800x600(37.5K) 800x600(35.2K) 640x480 640x400 640x350 QH QHRC PM3 PM2 PM1
1024x768 (NI) 1024x768 (I) 800x600(48K) 800x600(37.5K) 800x600(35.2K) 640x480 640x400 640x350 PM3 Mute
V_out F43.5K F36.2K F33K QV128 QVRC Vss SELPIN -QH F52K F60K
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
4
WT8045
Synchronous Signal Discriminator and Power Saving Detector for Green Monitor
WT8045N28P1
OSCin OSCout HSin VSin H_out V_out F43.5K F36.2K F33K QV128 QVRC Vss F52K PM1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 VDD
1024x768(56.5K)
1024x768 (NI) 1024x768 (I) 800x600(48K) 800x600(37.5K) 800x600(35.2K) 640x480 640x400 640x350 QH QHRC PM3 PM2
WT8045N28P3
OSCin OSCout HSin VSin H_out V_out F43.5K F36.2K F33K QV1 QVRC Vss F52K PM1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 VDD
1024x768(56.5K)
1024x768 (NI) 1024x768 (I) 800x600(48K) 800x600(37.5K) 800x600(35.2K) 640x480 640x400 640x350 QH QHRC PM3 PM2
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
5
WT8045
Synchronous Signal Discriminator and Power Saving Detector for Green Monitor
WT8045N28P4
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 27 26 25 24 23 22 21 20 19 18 17 16 15 VDD
1024x768(56.5K)
WT8045N28P5
OSCin OSCout HSin VSin H_out V_out F43.5K F36.2K F33K QV1 QVRC Vss F52K PM1 +PM2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 VDD
1024x768(56.5K)
1024x768 (NI) 1024x768 (I) 800x600(48K) 800x600(37.5K) 800x600(35.2K) 640x480 640x400 640x350 QH QHRC PM3 Mute
1024x768 (NI) 1024x768 (I) 800x600(48K) 800x600(37.5K) 800x600(35.2K) 640x480 640x400 640x350 QH QHRC PM3 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
WT8045
Synchronous Signal Discriminator and Power Saving Detector for Green Monitor
ABSOLUTE MAXIMUM RATINGS
ITEM Digital Supply Voltage Horizontal Sync. Input Voltage Vertical Sync. Input Voltage Power Dissipation Operating Temperature Range Storage Temperature Range SYMBOL VDD VHS VVS PD TOPT TSTG VALUE 5.5 VDD(5)+0.3 VDD(5)+0.3 300 0 a0 7 -40 a25 1 UNIT V VPP VPP mW J J
RECOMMENDED OPERATING CONDITIONS
ITEM Digital Supply Voltage Supply Current (Standby) Synchronous Input Voltage Low Synchronous Input Voltage High Horizontal Synchronous Frequency Range Vertical Synchronous Frequency Range Crystal Clock Frequency Open Drain Pull High Voltage Resistance of Monostable for Hsin Capacitance of Monostable for Hsin Resistance of Monostable for Vsin Capacitance of Monostable for Vsin
SYMBOL
VDD(5) IP VIL VIH FH FV FCLK VOH RH CH RV CV
MIN.
4.5
TYP.
5
MAX.
5.5 13 0.8 5.5 80 (for N32) 120 3.5836 12 100 500
UNIT
V mA VPP VPP KHz Hz MHz V K [ pF K [ pF
2.4 25 50 3.5764 10 10
4 3.58
100 100
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
7
WT8045
Synchronous Signal Discriminator and Power Saving Detector for Green Monitor
ELECTRICAL CHARACTERISTICS
(VDD=5V, TOPT=25C, Crystal=3.58MHz) ITEM SYMBOL F33K Discrimination of H. F36.2K Synchronous Frequency F43.5K F52K F60K Output Low (H-out, V-out), VOL1 when IOL = 4mA Output High (H-out, V-out), when IOH = -400 g A Open Drain Output Low when IOL = 6mA Output Sink Current (H-out, V-out) when VOL1 = 0.4V Output Drive Current (H-out, V-out) when VOH1 = 2.4V Open Drain Sink Current when VOL2 = 0.4V Open Drain Sink Current when VOL2 = 5V VOH1 VOL2 IOL1 WOH1 W I IOL2 IOL2 10 40
MIN.
32.9 36.1 43.4 51.9 59.9
TYP.

MAX.
33.1 36.3 43.6 52.1 60.1 0.4
UNIT
KHz KHz KHz KHz KHz VPP VPP
2.4 0.4 4 400
VPP mA g A mA mA
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
8
WT8045
Synchronous Signal Discriminator and Power Saving Detector for Green Monitor
MONO_STABLE DYNAMIC ELECTRICAL CHARACTERISTICS
(Ta=25C; Input tr,tf=20ns, CL=50PF) ITEM Input H_SYNC Pulse Width Input V_SYNC Pulse Width Output Pulse Transition Time Output Pulse Propagation Delay Output Pulse Width Adjust Range H_MONO_STB: 31KHz 7.5KHz 3 31KHz 8KHz 4 31KHz 7KHz 5 31KHz 4KHz 6 V_MONO_STB: (50Hz 20Hz)*128 1 6.4KHz 5.36KHz 1 (50Hz 0Hz)*128 8 6.4KHz 0.2KHz 1 (50Hz 20Hz)*1 1 Typical Pulse width Variation as a function of Temperature at 75 Jto 24 J Typical Pulse Width Variation as a function of Supply Voltage at 4.75V to 5.25V Output Low (Sink) Current Output Voltage Low-Level Output Voltage High-Level Output Jitter (Hout & Vout) MIN. 0.558 0.0384 10 TYP. 100 300 MAX. 4 0.125 200 600 90 UNITS g s ms ns ns M
26.66 20.83 17.54 15.62

s g s g s g s g
65.10 97.66 10 O 2
g s g s ms M
1 4.95
0
O 2 6 0.05 5
M mA V V ns
Hin & Vin Rise time and Fall time = 200ns
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
9
WT8045
Synchronous Signal Discriminator and Power Saving Detector for Green Monitor
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
10
WT8045
Synchronous Signal Discriminator and Power Saving Detector for Green Monitor
APPLICATION INFORMATION
Name OSCin OSCout Hsin Vsin H_OUT Function A clock generating circuit is built into the chip. So if a resonator is I connected to OSCin/OSCout, a clock signal can be obtained Refer to OSCin pin Input terminal of horizontal synchronous signal Input terminal of vertical synchronous signal O I, TTL compatible I, TTL compatible Output pin, fixed negative polarity of original H_SYNC signal with I, TTL same pulse width (but, positive for N28P2, N28P6,N28P7 and compatible N28P8) Output pin, fixed negative polarity of original V_SYNC signal with O, TTL same pulse width (but, positive for N28P2, N28P6,N28P7 and compatible N28P8) >43.5k then active low, <43.5k then high >36.2k then active low, <36.2k then high >33k then active low, <33k then high O, open drain O, open drain O, open drain Struncure of Terminal
V_OUT
F43.5k F36.2k F33k QV QVRC Vss SELPIN
Output pin, fixed positive polarity of vertical signal; pulse width O, open drain depend upon RV & CV. Input pin, connected to Vdd through RV & to ground through CV I Ground Input pin, to select which one of H_SYNC or V_SYNC appears on I, the output pin of QV; N.C. selects the V-SYNC on the output, (N.C.-no grounding selects the H_SYNC. connection) Output pin, fixed negative polarity of horizontal signal; pulse width O, open drain depend upon RH & CH. >52k then active low, <52k then high >60k then active low, < 60k then high Indicate in STAND-BY mode O, open drain O, open drain O, open drain
-QH F52k F60k PM1
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
11
WT8045
Synchronous Signal Discriminator and Power Saving Detector for Green Monitor
Struncure of Terminal O, open drain O, open drain I
Name PM2 PM3 QHRC QH 640 N50 3 640 N80 4 640 N00 4 640 N80 4 800 N00 6 800 N00 6 800 N00 6 1024 N 768(I) 1280 N 1024 1024 N 768(NI) 1024 N 768(57k) Vdd Indicate in SUSPEND mode Indicate in OFF mode
Function
Input pin, connected to Vdd through RH & to ground through CH.
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 N50 mode, or VESA O, open drain 3 VGA 640 N50 mode. Then active "low", else open state output 3 VESA VGA mode 640 N80 (37.5k/72Hz) 4 O, open drain
If IBM VGA 640 N00 mode, or VESA VGA 640 N00 mode then O, open drain 4 4 active "low" (640 N00, 31.5k, for N24P4) 4 If IBM VGA 640 N80 mode, or VESA VGA 640 N80 mode then O, open drain 4 4 active "low" (640 N80, 31.5k, for N24P4) 4 VESA super VGA mode (H_SYNC = 35.2k, V_SYNC = 56Hz) European super VGA mode (H_SYNC = 37.5k, V_SYNC = 60Hz) VESA new super VGA mode (H_SYNC = 48k, V_SYNC = 72Hz) IBM 8512/A interlace mode (H_SYNC = 35.5k, V_SYNC = 86Hz) 1280 N024 mode control output 1 (H_SYNC = 64k, V_SYNC = 60Hz) IBM 8514/A non-interlace mode (H_SYNC = 48.5k, V_SYNC = 60Hz) XGA 1024 N68 mode Hsync freq. 57kHz 7 (H_SYNC = 56.5k, V_SYNC = 72Hz) 5 Volts power supply O, open drain O, open drain O, open drain O, open drain O, open drain O, open drain O, open drain
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
WT8045
Synchronous Signal Discriminator and Power Saving Detector for Green Monitor
APPLICATION DESCRIPTION
DPMS (Display Power Management Signaling) Detection As per DPMS proposal version 1.0P, revision 0.54P, WT8045 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
Signals State On Stand-by Suspend Off Horizontal Pulses Vertical Pulses Video Active
DPMS Compliance Requirement Mandatory Optional Mandatory Mandatory
Power Savings None Minimal Substantial Maximum
Recovery Time Not Applicable Short Longer System Dependent
No Pulses Pulses Blanked Pulses No Pulses Blanked No Pulses No Pulses Blanked
* "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
13
WT8045
Synchronous Signal Discriminator and Power Saving Detector for Green Monitor
The way WT8045 implements VESA DPMS As shown on Table 2, WT8045 use PM1 to represent Stand-by State, PM2 as Suspend State and PM3 as OFF State. When H_SYNC / V_SYNC signals transition from ON State to any one of the three power saving states, WT8045 will delay 5.9 seconds to meet the VESA DPMS requirement: the minimum 5 seconds delay to avoid unintentionally entering a power saving state during display resolution and timing mode changes. If during this delay time period, H_SYN and V_SYN signals return to ON State, then all three power management pins (PM1, PM2 and PM3) will remain ON state. If power management state of H_SYNC and V_SYNC prolong for more than 5.9 seconds, then these three power management pins will change to the corresponding states. While changing from any power saving state back to ON State will take about 0.368 second for H_SYNC / VSYNC pulse checking. And transition between any power saving state will be done immediately.
Table 2: The truth table of Power Saving Detector MODE ON STAND_BY SUSPEND OFF OVERRIDE Hsin Pulses No Pulses Pulses No Pulses No Pulses Manually Vsin Pulses Pulses No Pulses No Pulses No Pulses PWR ON PM1 1 0 0 0 1 PM2 1 1 0 0 1 PM3 1 1 1 0 1
OVERRIDE mode: To initial override, both horizontal and vertical sync signals shall be in the no pulses condition when the display is maintained during the entire time override is required. As soon as pulses are detected on horizontal and vertical sync signal. The display shall enter DPMS operation. Three power management pins are open drain structure and active low. If you do not need all those three power saving states in your design. You can just short two or three pins of the pins PM1/PM2/PM3. for example, by shorting pin PM1 and pin PM2, you will have only two power saving states, that is OFF and Suspend states, so you have three states total, including ON State. Please refer to Application Circuit 2.
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
14
WT8045
Synchronous Signal Discriminator and Power Saving Detector for Green Monitor
Mono_Stable Circuit WT8045 includes two sets of Mono_Stable Circuits, one uses H_SYNC as trigger signal, the other uses either H_SYNC or V_SYNC as trigger signal (this only can be done on 32 pin package, for 24 pin and 28 pin packages the trigger signal is fixed to H_SYNC); for N24p4 package, there is no mono-stable circuit. Please refer to the figure as below:
H-SYNC
vcc
T
QH
Rx/Cx
QH-
V-SYNC
SWITCH vcc
T
Q
SELECT=OPEN QV
SELECT=L QH
SELECT
Rx/Cx
Q-
The Mono_Stable Circuit is triggered by positive edge, no matter H_SYNC or V_SYNC is used as trigger signal. Please refer to the timing chart as below:
Trigger Pulse positive negative
Q Q-
The output of Mono_Stable Circuit is open drain structure, and can be pulled up to +12V maximum.
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
15
WT8045
Synchronous Signal Discriminator and Power Saving Detector for Green Monitor
In case of using output pulse of V_MONO_STABLE as voltage source, in order to prevent the problem of slow response time, causing from the low frequency on vertical synchronous signal, WT8045 internally increases the vertical signal frequency to 128 times the original frequency, that is from 50Hz - 120 Hz to 6.4KHz - 15.36KHz. Then WT8045 uses this increased frequency as the input signal of MONO_STABLE, so the leading edge of the signal of the increased frequency will trigger the MONO_STABLE circuit. An external resistor (Rx) and an external capacitor (Cx) control the timing and accuracy of the circuit. Adjustment of Rx and Cx provides a wide range of output pulse widths from the Q and Q-bar terminals. The delay time from trigger input to output transition is independent of Rx and Cx. The minimum value of external resistor Rx is 10k ohms. The typical value of external capacitor Cx is 100 pF. The time period (T) for this multi-vibrator can be calculated with the formula: T 1.1 Rx * Cx. H/V Frequency Divisions and Video Modes Figure 1 illustrates the typical frequency ranges of H and V sync signals for display monitors. The operating video modes are determined by the H and V frequencies, and occasionally, by their polarities. The typical video modes of display monitors include the IBM VGA, VESA VGA, European VGA/super VGA, VESA super VGA, IBM 8514/A, XGA, and 1280x 1024. WT8045 can determine 13 standard video modes for 32 pin package (refer to Table 3) according to H and V frequencies and polarities. These standard video modes include the IBM VGA, VESA VGA, VESA super VGA and IBM 8514/A. This provides the users with the capability to adjust the screen size for different modes. WT8045 pre-sets the discriminating points both on H and V frequencies. The discriminating points for H sync are 33KHz, 36.2KHz, 43.5KHz, 52KHz and 60KHz (for 32 pin). These discriminating points will be able to identify various video modes as shown in Fig. 1. WT8045 also provides the flexibility for users to define these discriminating points through mask option.
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
16
WT8045
Synchronous Signal Discriminator and Power Saving Detector for Green Monitor
The tolerance for H sync frequency discrimination is O.1KHz. For instance, the 33KHz 0 discriminating point will be able to distinguish the H sync frequency that is either "less than or equal to" 32.9KHz, or "greater than or equal to" 33.1KHz. There is an ambiguous region between 32.9KHz and 33.1KHz. WT8045 has two discriminating points, 64Hz and 78Hz, for the V sync signal as shown in Fig.1. The tolerance is O.4Hz. The discrimination results of V sync frequency are used internally for 0 mode selection. Base on the package consideration, IBM VGA mode and VESA VGA mode (both have same resolution: 640x480, 640x400, 640x350) are decoded on same open Drain structure output pins. In case of these whole six modes decoding is needed, the horizontal frequency discrimination pin F33k or F36.2k must take into consideration. The horizontal frequency of IBM VGA mode is 31.5kHz, and VESA IBM VGA mode is 37.5kHz. Using F33k or F36.2k pin can clearly identify these two standard modes. The decoding circuit is attached on application section for reference.
Graphic Standard IBM VGA VESA Super VGA IBM 8512/A Interlaced VESA VGA European Super VGA VESA New Super VGA IBM 8514/A Non-Interlaced VESA New 1024X768 Work Station 1280X1024
Resolution 640X350 640X400 640X480 800X600 1024X768 640X350 640X400 640X480 800X600 800X600 1024X768 1024X768 1280X1024
Horizontal 31.5kHz 31.5kHz 31.5kHz 35.2kHz 35.5kHz 37.5kHz 37.5kHz 37.5kHz 37.5kHz 48.0kHz 48.5kHz 56.5kHz 64.0kHz
Vertical 70Hz 70Hz 60Hz 56Hz 86Hz 83Hz 83Hz 72Hz 60Hz 72Hz 60Hz 72Hz 60Hz
Polarities +,-,+ -.-
+,-,+ -,-
Table 3: Graphic Standard and Frequencies
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
17
WT8045
Synchronous Signal Discriminator and Power Saving Detector for Green Monitor
Fv (Hz)
640X350 (+,-) 640x400 (-,+) 800X600 640X350 (+,-) 640x400 (-,+) 800X600 640X480 (-,-) 800X600 1024X768 640X480 (-,-) 1024X768 1280X1024
83.86 78 70.72 64 56.60
1024X768
0
31.5 33
35
36.2
38
48 43.5
52
56
64 Fh(KHz) 60 (58.5 for N28P2)
Figure 1: H/V Frequency Division and Video Mode
PIN Mode IBM VGA VESA VGA 640X480 640X400 640X350 640X480 640X400 640X350
640X480 0 1 1 0 1 1
640X400 1 0 1 1 0 1
640X350 1 1 0 1 1 0
Table 4: IBM VGA/ VESA VGA Decoding Table
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
18
WT8045
Synchronous Signal Discriminator and Power Saving Detector for Green Monitor
Horizontal Frequency Discriminator There are horizontal frequency discriminator pins on different type package: 33k, 36.2k (for N24P4 package); 33k, 36.2k, 43.5k (for 24 pin); 33k, 36.2k, 43.5k, 52k (for 28 pin); 33k, 36.2k, 43.5k, 52k, 60k (for 32 pin); please refer to table 5 for the logical truth table of these pins. These frequency discriminator pins output can be used for CS Capacitor Control directly as well as other application.
Signa l Hsync Hs<33k 36k>Hs>33k 43.5k>Hs>36k 52k>Hs>43.5k 60k>Hs>52k
F33k
F36k
F43.5k
F52k
F60k
1 0 0 0 0
1 1 0 0 0
1 1 1 0 0
1 1 1 1 0
1 1 1 1 1
Table 5: Truth table of Frequency discriminator
Mute function Timing Diagram
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
19
WT8045
Synchronous Signal Discriminator and Power Saving Detector for Green Monitor
APPLICATION CIRCUIT I
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
20
WT8045
Synchronous Signal Discriminator and Power Saving Detector for Green Monitor
APPLICATION CIRCUITII
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
21
WT8045
Synchronous Signal Discriminator and Power Saving Detector for Green Monitor
APPLICATION CIRCUIT III
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
22
WT8045
Synchronous Signal Discriminator and Power Saving Detector for Green Monitor
APPLICATION CIRCUIT IV
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
23
WT8045
Synchronous Signal Discriminator and Power Saving Detector for Green Monitor
DIP OUTLINE DIMENSIONS
N24 N28 SKINNY N32
A 1250 1385 1650
B 542 288 542
C 152 130 154
D 100 100 100
E 130 130 130
F 650 355 650
G 600 310 600
Dimension in mil 1mm = 39.37 mil
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
24
WT8045
Synchronous Signal Discriminator and Power Saving Detector for Green Monitor
WT8045N28P2
OSCin OSCout HSin VSin H_out V_out F43.5K F36.2K F33K QV128 QVRC Vss F52K PM1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 VDD
1024x768(56.5K)
WT8045N28P6
OSCin OSCout HSin VSin H_out V_out F43.5K F36.2K F33K QV1 QVRC Vss F52K PM1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 VDD
1024x768(56.5K)
1024x768 (NI) 1024x768 (I) 800x600(48K) 800x600(37.5K) 800x600(35.2K) 640x480(31.5K) 640x400 (31.5K/37.5K) 640x480(37.5K) QH QHRC PM3 PM2
1024x768 (NI) 1024x768 (I) 800x600(48K) 800x600(37.5K) 800x600(35.2K) 640x480(31.5K) 640x400 (31.5K/37.5K) 640x480(37.5K) QH QHRC PM3 PM2
WT8045N28P7
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 27 26 25 24 23 22 21 20 19 18 17 16 15 VDD
1024x768(56.5K)
WT8045N28P8
OSCin OSCout HSin VSin H_out V_out F43.5K F36.2K F33K QV1 QVRC Vss F52K PM1 +PM2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 VDD
1024x768(56.5K)
1024x768 (NI) 1024x768 (I) 800x600(48K) 800x600(37.5K) 800x600(35.2K) 640x480(31.5K) 640x400 (31.5K/37.5K) 640x480(37.5K) QH QHRC PM3 Mute
1024x768 (NI) 1024x768 (I) 800x600(48K) 800x600(37.5K) 800x600(35.2K) 640x480(31.5K) 640x400 (31.5K/37.5K) 640x480(37.5K) QH QHRC PM3 Mute
Note: The Hout and Vout pin of N28P2, N28P6, N28P7 and N28P8 are positive 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
25

▲Up To Search▲

Price & Availability of WT8045

	To Download WT8045 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .