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Author Topic: Edge Trigger  (Read 2368 times)

Offline 'yus

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Edge Trigger
« on: April 03, 2008, 11:26:05 AM »
.. nakakalito mag-model ng PWM circuit..  :'( ...hays..  :'(

question:
sa mga digital/logic circuits (like flip-flops and counters),
alin ang mas ginagamit na trigger type : Leading-Edge o Trailing-Edge ?  ???
anong pinag-kaiba saka mga advantages/disadvantages nilang dalawa ?  ???
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Edge Trigger
« on: April 03, 2008, 11:26:05 AM »

Offline rdpzycho

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Re: Edge Trigger
« Reply #1 on: April 03, 2008, 11:32:41 AM »
para sa akin, depende sa paggagamitan...

like sa PWM circuit, kailangan mag trigger on ka sa Leading Edge then force off sa Trailing Edge...

sa Interrupts sa microcontroller mas common ata ang Trailing Edge...

then sa Gates / Flip-Flops mas common naman ata ang Leading Edge...

combination of both ginagamit din sa Pulse Triggered Flip-Flop (Master-Slave)...
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Re: Edge Trigger
« Reply #1 on: April 03, 2008, 11:32:41 AM »

Offline 'yus

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Re: Edge Trigger
« Reply #2 on: April 03, 2008, 01:34:13 PM »
buti sana kung very narrow yung trigger pulse para negligible ang delay/difference ng leading saka trailing edges,
kaya lang sa sobrang narrow, baka di na sya ma-detect..  :(
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Re: Edge Trigger
« Reply #2 on: April 03, 2008, 01:34:13 PM »

Offline rdpzycho

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Re: Edge Trigger
« Reply #3 on: April 03, 2008, 01:35:53 PM »
ano ba paggagamitan?
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Re: Edge Trigger
« Reply #3 on: April 03, 2008, 01:35:53 PM »

Offline 'yus

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Re: Edge Trigger
« Reply #4 on: April 03, 2008, 01:50:57 PM »
Quote from: rdpzycho on April 03, 2008, 01:35:53 PM
ano ba paggagamitan?
sa simulation lang muna..
ginagaya ko kasi yung internal block diagram ng isang IC..
very common sa mga diagrams yung RS flip-flop..
pero di nila ini-specify kung leading or trailing edge trigger yung FF..  :(
ano kaya ang default nito ?  ???
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Re: Edge Trigger
« Reply #4 on: April 03, 2008, 01:50:57 PM »

Offline rdpzycho

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Re: Edge Trigger
« Reply #5 on: April 03, 2008, 01:53:23 PM »
ah PWM IC mismo...

meron akong inimplement sa experiment dati, D Flip Flop ginamit ko and comparator, leading edge trigger...ginamit ko rin yung mga clear, at set pins na hindi kailangan ng clock...

anong IC?
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Re: Edge Trigger
« Reply #6 on: April 03, 2008, 01:56:43 PM »
Quote from: rdpzycho on April 03, 2008, 01:53:23 PM
ah PWM IC mismo...
..anong IC?
yung mga 384X na mga PWM IC (current mode)..
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Offline rdpzycho

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Re: Edge Trigger
« Reply #7 on: April 03, 2008, 02:00:40 PM »
level triggered ata un...tapos kaya i-force ng signal sa R na mag reset yung RS latch...

eto ba yung oscillator nakakabit sa S at output ng comparator sa R?

ang ginawa ko kasi dati, yung output ng oscillator nasa clock input ng D flip flop, tapos output ng comparator nasa Clear (yung asychronous clear)...
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Re: Edge Trigger
« Reply #8 on: April 03, 2008, 02:15:37 PM »
Quote from: rdpzycho on April 03, 2008, 02:00:40 PM
level triggered ata un...tapos kaya i-force ng signal sa R na mag reset yung RS latch...
ang nakakalito sa RS flip-flop is yung during illegal/race condition (yung parehong high ang input)..
kaya iniisip ko na baka hindi pwede ang level trigger sa RS flip-flop,
edge trigger lang para di magka-error..  ::)
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Re: Edge Trigger
« Reply #9 on: April 03, 2008, 02:28:23 PM »
yung R lamang lagi dun sa S sa ganyang type...wala ata sa simulator nun, kailangan gumawa ka ng gates...

yung R kasi kailangan pwede mapatay yung output ng flip flop kahit walang edge kaya hindi pwedeng may edge trigerring...
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Re: Edge Trigger
« Reply #10 on: April 06, 2008, 11:08:12 PM »


eto yung PWM implementation ko dati derived from block diagram of UC3717A stepper motor driver...



eto yung actual circuit (ang pangit hehehe)...2 D flip-flop, 1 quad comparator (useless yung 2), 2 full bridge driver from Intersil (HIP4080A)...yung nasa baba XOR gate, hindi kasama sa PWM un...

yung oscillator ko nasa external board, hindi kasi naka-sync lahat ng driver para hindi sabay-sabay kumuha ng current...

current nga lang pala feedback nito...
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Re: Edge Trigger
« Reply #11 on: April 09, 2008, 01:06:12 AM »
Julznc pag gusto mo fast triggering dapat leading edge, pag e consider mo ang period o time nong pulse dapat trailling edge, meron namang mga IC logic inputs  yong buong pulse ang binabasa.

 its in the datasheet, kung minsan leading (going up ) o trailing (going down) edge nang pulse ang triggering nong input.

it usally triggers at 2V level.
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Re: Edge Trigger
« Reply #11 on: April 09, 2008, 01:06:12 AM »
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