View WT8045_1346682.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

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 1 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 c ontrol 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.
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 2 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. package note WT8045n24p1 p-dip 24l v * 128 WT8045n24p3 p-dip 24l without mute WT8045n24p4 p-dip 24l without mute WT8045n24p5 p-dip 24l v * 1 WT8045n24p6 p-dip 24l with mute WT8045n24p7 p-dip 24l without mute WT8045n24p8 p-dip 24l with mute WT8045n28p1 p-dip 28l (skinny) v * 128 without mute WT8045n28p2 p-dip 28l (skinny) v * 128 without mute WT8045n28p3 p-dip 28l (skinny) v * 1 without mute WT8045n28p4 p-dip 28l (skinny) v * 128 with mute WT8045n28p5 p-dip 28l (skinny) v * 1 with mute WT8045n28p6 p-dip 28l (skinny) v * 1 without mute WT8045n28p7 p-dip 28l (skinny) v * 128 with mute WT8045n28p8 p-dip 28l (skinny) v * 1 with mute WT8045n32 p-dip 32l --
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 3 pin configuration 1 2 3 4 5 6 7 8 9 10 11 12 14 15 16 oscin hsin oscout vsin h_out v_out vdd WT8045n24p1 f43.5k f36.2k qv128 qvrc vss qhrc qh 640x400 640x480 800x600(48k) 17 18 19 20 21 22 23 24 800x600(37.5k) 800x600(35.2k) 1024x768(56.5k) 1024x768 (i) f33k 640x350 1024x768 (ni) 13 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 oscin hsin oscout vsin h_out v_out vdd WT8045n24p3 f43.5k f36.2k pm3 pm1 vss qhrc qh 640x400 640x480 800x600(48k) 17 18 19 20 21 22 23 24 800x600(37.5k) 800x600(35.2k) 1024x768(56.5k) 1024x768 (i) f33k 640x350 1024x768 (ni) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 oscin hsin oscout vsin hout vout vdd WT8045n24p4 f36.2k f33k nc nc vss pm1 pm2 pm3 nc 640x350 (31.5k/37.5k) 640x480 (37.5k/72hz) 640x400(31.5k) 17 18 19 20 21 22 23 24 640x480(31.5k) 800x600(35.2k) nc 800x600(37.5k) 1024x768 (i) 1 2 3 4 5 6 7 8 9 10 11 12 14 15 16 oscin hsin oscout vsin h_out v_out vdd WT8045n24p5 f43.5k f36.2k qv1 qvrc vss qhrc qh 640x400 640x480 800x600(48k) 17 18 19 20 21 22 23 24 800x600(37.5k) 800x600(35.2k) 1024x768(56.5k) 1024x768 (i) f33k 640x350 1024x768 (ni) 13
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 4 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 oscin hsin oscout vsin h_out v_out vdd WT8045n24p6 f43.5k f36.2k pm3 mute vss qhrc qh 640x400 640x480 800x600(48k) 17 18 19 20 21 22 23 24 800x600(37.5k) 800x600(35.2k) 1024x768(56.5k) 1024x768 (i) f33k 640x350 1024x768 (ni) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 oscin hsin oscout vsin h_out v_out vdd WT8045n24p7 f43.5k f36.2k pm1 p52k vss pm2 pm3 640x400 640x480 800x600(48k) 17 18 19 20 21 22 23 24 800x600(37.5k) 800x600(35.2k) 1024x768(56.5k) 1024x768 (i) f33k 640x350 1024x768 (ni) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 oscin hsin oscout vsin h_out v_out vdd WT8045n24p8 f43.5k f36.2k pm1+pm2 p52k vss mute pm3 640x400 640x480 800x600(48k) 17 18 19 20 21 22 23 24 800x600(37.5k) 800x600(35.2k) 1024x768(56.5k) 1024x768 (i) f33k 640x350 1024x768 (ni) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 oscin hsin oscout vsin h_out v_out vdd WT8045n32 f43.5k f36.2k pm3 pm1 vss qhrc 640x400 640x480 800x600(48k) 17 18 19 20 21 22 31 32 800x600(37.5k) 800x600(35.2k) 1024x768(56.5k) 1024x768 (i) f33k 640x350 1024x768 (ni) 30 29 28 27 26 25 24 23 qv128 qvrc selpin qh -qh f52k f60k pm2 1280x1024(64k)
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 5 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 oscin hsin oscout vsin h_out v_out vdd WT8045n28p1 f43.5k f36.2k pm3 pm1 vss qhrc 640x400 640x480 800x600(48k) 17 18 19 20 21 22 800x600(37.5k) 800x600(35.2k) 1024x768(56.5k) 1024x768 (i) f33k 640x350 1024x768 (ni) 28 27 26 25 24 23 qv128 qvrc qh f52k pm2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 oscin hsin oscout vsin h_out v_out vdd WT8045n28p3 f43.5k f36.2k pm3 pm1 vss qhrc 640x400 640x480 800x600(48k) 17 18 19 20 21 22 800x600(37.5k) 800x600(35.2k) 1024x768(56.5k) 1024x768 (i) f33k 640x350 1024x768 (ni) 28 27 26 25 24 23 qv1 qvrc qh f52k pm2
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 6 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 oscin hsin oscout vsin h_out v_out vdd WT8045n28p4 f43.5k f36.2k pm3 pm1 +pm2 vss qhrc 640x400 640x480 800x600(48k) 17 18 19 20 21 22 800x600(37.5k) 800x600(35.2k) 1024x768(56.5k) 1024x768 (i) f33k 640x350 1024x768 (ni) 28 27 26 25 24 23 qv128 qvrc qh f52k mute 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 oscin hsin oscout vsin h_out v_out vdd WT8045n28p5 f43.5k f36.2k pm3 pm1 +pm2 vss qhrc 640x400 640x480 800x600(48k) 17 18 19 20 21 22 800x600(37.5k) 800x600(35.2k) 1024x768(56.5k) 1024x768 (i) f33k 640x350 1024x768 (ni) 28 27 26 25 24 23 qv1 qvrc qh f52k mute note: the hout and vout pin of n28p1, n28p3, n28p4 and n28p5 are negative pulse.
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 7 absolute maximum ratings item symbol value unit digital supply voltage v dd 5.5 v horizontal sync. input voltage v hs v dd (5)+0.3 v pp vertical sync. input voltage v vs v dd (5)+0.3 v pp power dissipation p d 300 mw operating temperature range t opt 0 ?? 70 j storage temperature range t stg -40 ?? 125 j recommended operating conditions item symbol min. typ. max. unit digital supply voltage v dd (5) 4.5 5 5.5 v supply current (standby) i p 13 ma synchronous input voltage low v il 0.8 v pp synchronous input voltage high v ih 2.4 4 5.5 v pp horizontal synchronous frequency range f h 25 ?e 80 (for n32) khz vertical synchronous frequency range f v 50 ?e 120 hz crystal clock frequency f clk 3.5764 3.58 3.5836 mhz open drain pull high voltage v oh 12 v resistance of monostable for hsin r h 10 100 k [ capacitance of monostable for hsin c h ?e 100 ?e pf resistance of monostable for vsin r v 10 500 k [ capacitance of monostable for vsin c v ?e 100 ?e pf
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 8 electrical characteristics (v dd =5v, t opt =25 c, crystal=3.58mhz) item symbol min. typ. max. unit f33k 32.9 ?e 33.1 khz discrimination of h. f36.2k 36.1 ?e 36.3 khz synchronous frequency f43.5k 43.4 43.6 khz f52k 51.9 ?e 52.1 khz f60k 59.9 ?e 60.1 khz output low (h-out, v-out), when i ol = 4ma v ol1 0.4 v pp output high (h-out, v-out), when i oh = -400 g a v oh1 2.4 v pp open drain output low when i ol = 6ma v ol2 0.4 v pp output sink current (h-out, v-out) when v ol1 = 0.4v i ol1 4 ma output drive current (h-out, v-out) when v oh1 = 2.4v ?w i oh1 ?w 400 g a open drain sink current when v ol2 = 0.4v i ol2 10 ma open drain sink current when v ol2 = 5v i ol2 40 ma
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 9 mono_stable dynamic electrical characteristics (ta=25 c; input t r ,t f =20ns, c l =50pf) item min. typ. max. units input h_sync pulse width 0.558 ?e 4 g s input v_sync pulse width 0.0384 ?e 0.125 ms output pulse transition time ?e 100 200 ns output pulse propagation delay ?e 300 600 ns output pulse width adjust range 10 ?e 90 m h_mono_stb: 31khz ?e 37.5khz 26.66 g s 31khz ?e 48khz 20.83 g s 31khz ?e 57khz 17.54 g s 31khz ?e 64khz 15.62 g s v_mono_stb: (50hz ?e 120hz)*128 6.4khz ?e 15.36khz 65.10 g s (50hz ?e 80hz)*128 6.4khz ?e 10.2khz 97.66 g s (50hz ?e 120hz)*1 10 ms typical pulse width variation as a function of temperature at 75 j to 24 j ?e ?e ? 2 m typical pulse width variation as a function of supply voltage at 4.75v to 5.25v ?e ?e ? 2 m output low (sink) current 1 ?e 6 ma output voltage low-level ?e 0 0.05 v output voltage high-level 4.95 ?e v output jitter (hout & vout) hin & vin rise time and fall time = 200ns 5 ns
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 ????????????????????????????????????????? ????????????????????????????????????????? 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 application information struncure name function of terminal oscin a clock generating circuit is built into the chip. so if a resonator is connected to oscin/oscout, a clock signal can be obtained i oscout refer to oscin pin o hsin input terminal of horizontal synchronous signal i, ttl compatible vsin input terminal of vertical synchronous signal i, ttl compatible h_out output pin, fixed negative polarity of original h_sync signal with same pulse width (but, positive for n28p2, n28p6,n28p7 and n28p8) i, ttl compatible v_out output pin, fixed negative polarity of original v_sync signal with same pulse width (but, positive for n28p2, n28p6,n28p7 and n28p8) o, ttl compatible f43.5k >43.5k then active low, <43.5k then high o, open drain f36.2k >36.2k then active low, <36.2k then high o, open drain f33k >33k then active low, <33k then high o, open drain qv output pin, fixed positive polarity of vertical signal; pulse width depend upon rv & cv. o, open drain qvrc input pin, connected to vdd through rv & to ground through cv i vss ground selpin input pin, to select which one of h_sync or v_sync appears on the output pin of qv; n.c. selects the v-sync on the output, grounding selects the h_sync. i, (n.c.-no connection) -qh output pin, fixed negative polarity of horizontal signal; pulse width depend upon rh & ch. o, open drain f52k >52k then active low, <52k then high o, open drain f60k >60k then active low, < 60k then high o, open drain pm1 indicate in stand-by mode o, open drain
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 12 struncure name function of terminal pm2 indicate in suspend mode o, open drain pm3 indicate in off mode o, open drain qhrc input pin, connected to vdd through rh & to ground through ch. i qh output pin, fixed positive polarity of horizontal signal; pulse width depend upon rh & ch o, open drain 640 ?? 350 mode select control output, if ibm vga 640 ?? 350 mode, or vesa vga 640 ?? 350 mode. then active "low", else open state output o, open drain 640 ?? 480 vesa vga mode 640 ?? 480 (37.5k/72hz) o, open drain 640 ?? 400 if ibm vga 640 ?? 400 mode, or vesa vga 640 ?? 400 mode then active "low" (640 ?? 400, 31.5k, for n24p4) o, open drain 640 ?? 480 if ibm vga 640 ?? 480 mode, or vesa vga 640 ?? 480 mode then active "low" (640 ?? 480, 31.5k, for n24p4) o, open drain 800 ?? 600 vesa super vga mode (h_sync = 35.2k, v_sync = 56hz) o, open drain 800 ?? 600 european super vga mode (h_sync = 37.5k, v_sync = 60hz) o, open drain 800 ?? 600 vesa new super vga mode (h_sync = 48k, v_sync = 72hz) o, open drain 1024 ?? 768(i) ibm 8512/a interlace mode (h_sync = 35.5k, v_sync = 86hz) o, open drain 1280 ?? 1024 1280 ?? 1024 mode control output (h_sync = 64k, v_sync = 60hz) o, open drain 1024 ?? 768(ni) ibm 8514/a non-interlace mode (h_sync = 48.5k, v_sync = 60hz) o, open drain 1024 ?? 768(57k) xga 1024 ?? 768 mode hsync freq. 57khz (h_sync = 56.5k, v_sync = 72hz) o, open drain vdd 5 volts power supply
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 13 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 state signals dpms compliance power savings recovery time horizontal vertical video requirement on pulses pulses active mandatory none not applicable stand-by no pulses pulses blanked optional minimal short suspend pulses no pulses blanked mandatory substantial longer off no pulses no pulses blanked mandatory maximum 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
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 14 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 hsin vsin pm1 pm2 pm3 on pulses pulses 1 1 1 stand_by no pulses pulses 0 1 1 suspend pulses no pulses 0 0 1 off no pulses no pulses 0 0 0 override no pulses no pulses 1 1 1 manually pwr on 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.
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 15 mono_stable circuit WT8045 includes two sets of mono_stable circuits, one uses h_sync as trigg er 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 v-sync select switch vcc t qh rx/cx qh- vcc t q rx/cx q- qv select=open qh select=l 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 q q- positive negative the output of mono_stable circuit is open drain structure, and can be pulled up to +12v maximum.
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 16 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.
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 17 the tolerance for h sync frequency discrimination is ? 0.1khz. for instance, the 33khz 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 ? 0.4hz. the discrimination results of v sync frequency are used internally for 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 resolution horizontal vertical polarities 640x350 31.5khz 70hz +,- ibm vga 640x400 31.5khz 70hz -,+ 640x480 31.5khz 60hz -.- vesa super vga 800x600 35.2khz 56hz ibm 8512/a interlaced 1024x768 35.5khz 86hz 640x350 37.5khz 83hz +,- vesa vga 640x400 37.5khz 83hz -,+ 640x480 37.5khz 72hz -,- european super vga 800x600 37.5khz 60hz vesa new super vga 800x600 48.0khz 72hz ibm 8514/a non-interlaced 1024x768 48.5khz 60hz vesa new 1024x768 1024x768 56.5khz 72hz work station 1280x1024 1280x1024 64.0khz 60hz table 3: graphic standard and frequencies
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 18 640x350 (+,-) 640x400 (-,+) 1024x768 640x350 (+,-) 640x400 (-,+) 640x480 (-,-) 640x480 (-,-) 1024x768 1024x768 800x600 800x600 800x600 1280x1024 fv (hz) 78 64 83.86 70.72 56.60 0 31.5 33 36.2 43.5 52 60 (58.5 for n28p2) 35 38 48 56 64 fh(khz) figure 1: h/v frequency division and video mode pin 640x480 640x400 640x350 mode ibm 640x480 0 1 1 640x400 1 0 1 vga 640x350 1 1 0 vesa 640x480 0 1 1 640x400 1 0 1 vga 640x350 1 1 0 table 4: ibm vga/ vesa vga decoding table
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 19 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 c s capacitor control directly as well as other application. signa l hsync f33k f36k f43.5k f52k f60k hs<33k 1 1 1 1 1 36k>hs>33k 0 1 1 1 1 43.5k>hs>36k 0 0 1 1 1 52k>hs>43.5k 0 0 0 1 1 60k>hs>52k 0 0 0 0 1 table 5: truth table of frequency discriminator mute function timing diagram
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 20 application circuit i
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 21 application circuitii
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 22 application circuit iii
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 23 application circuit iv
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 24 dip outline dimensions a b c d e f g n24 1250 542 152 100 130 650 600 n28 skinny 1385 288 130 100 130 355 310 n32 1650 542 154 100 130 650 600 ? dimension in mil ? 1mm = 39.37 mil
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 25 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 oscin hsin oscout vsin h_out v_out vdd WT8045n28p2 f43.5k f36.2k pm3 pm1 vss qhrc 640x400 (31.5k/37.5k) 640x480(31.5k) 800x600(48k) 17 18 19 20 21 22 800x600(37.5k) 800x600(35.2k) 1024x768(56.5k) 1024x768 (i) f33k 640x480(37.5k) 1024x768 (ni) 28 27 26 25 24 23 qv128 qvrc qh f52k pm2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 oscin hsin oscout vsin h_out v_out vdd WT8045n28p6 f43.5k f36.2k pm3 pm1 vss qhrc 640x400 (31.5k/37.5k) 640x480(31.5k) 800x600(48k) 17 18 19 20 21 22 800x600(37.5k) 800x600(35.2k) 1024x768(56.5k) 1024x768 (i) f33k 640x480(37.5k) 1024x768 (ni) 28 27 26 25 24 23 qv1 qvrc qh f52k pm2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 oscin hsin oscout vsin h_out v_out vdd WT8045n28p7 f43.5k f36.2k pm3 pm1 +pm2 vss qhrc 640x400 (31.5k/37.5k) 640x480(31.5k) 800x600(48k) 17 18 19 20 21 22 800x600(37.5k) 800x600(35.2k) 1024x768(56.5k) 1024x768 (i) f33k 640x480(37.5k) 1024x768 (ni) 28 27 26 25 24 23 qv128 qvrc qh f52k mute 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 oscin hsin oscout vsin h_out v_out vdd WT8045n28p8 f43.5k f36.2k pm3 pm1 +pm2 vss qhrc 640x400 (31.5k/37.5k) 640x480(31.5k) 800x600(48k) 17 18 19 20 21 22 800x600(37.5k) 800x600(35.2k) 1024x768(56.5k) 1024x768 (i) f33k 640x480(37.5k) 1024x768 (ni) 28 27 26 25 24 23 qv1 qvrc qh f52k mute note: the hout and vout pin of n28p2, n28p6, n28p7 and n28p8 are positive pulse.

▲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 .