hisgoofyness 0 #1 January 3, 2002 i found a used rig, but it has an fxc installed instead of a cypres, i have heard a few bad things about the fxc. is there any truth to these rumors? if they issue these in the military, can they really be that bad?or can a fxc be replaced by a cypresthanks for any advice in advancehisgoofynessits a bird, its a plane, no wait, its one goofy s.o.b. Quote Share this post Link to post Share on other sites
riggerrob 643 #2 January 3, 2002 FXC 12000 Automatic Activation Devices work fine in the student environment (setting activation altitude at 1000', and opening at 3000'), but they are not accurate enough for licensed jumpers who open at 2000'.In response to your second question, almost any rig can be retrofitted for a Cypres. Just make sure that they are an FAA Master Rigger (or foreign equivalent) and that they have the purple binder showing that they have completed the training requirements set out by Airtec. Quote Share this post Link to post Share on other sites
scottbre 0 #3 January 3, 2002 I have been told that you should definately not do spirals or fast turns under canopy with a rig that has a fxc 12000 on it."Can't keep my mind from the circling sky. Tongue-tied & twisted just an earth-bound misfit, I." Quote Share this post Link to post Share on other sites
Zennie 0 #4 January 3, 2002 My rigger was saying that the Astra is actually a pretty good AAD -- that they could seriosuly cut into Airtec's business if Airtec keeps up withthe battery & 12-year lifetime stuff. I mentioned the FXC 12000 and he said it was a totally different animal."Zero Tolerance: the politically correct term for zero thought, zero common sense." Quote Share this post Link to post Share on other sites
PhreeZone 20 #5 January 3, 2002 Astra's still require regular battery maintence like a Cypres and they are not near the level of accuracy as a Cypres. A Astra is accurate to I THINK 500 feet +/-. The Cypres is at 250 +/-. I've heard rumors of Airtec might offer rebates for trading a 12 year old Cypres in on a new one. The oldest Cypres is only like 10.5 now so we have to wait another year to find out.As for the 12000, its operating window is +/- 1000 feet from set altitude. Set it at 1000 and it could pop at 2000 or at impact or anywhere in between. We use the 12000's in our student rigs and they have put more then 1 recent graduate under 2 canopys because they are set at 1500 and pop at 2500 after the former student has a good canopy already over their head.The 12000 was state of the art in the late 70's. Its a totally mechenical system that uses a spring to pull the pin on the reserve. The Cypres is a solid state computer controled device that can adjust for things like a frontal system moving through and stuff. I would love to never see another 12000 on any rig as long as I'm around.I want to touch the sky, I want to fly so high ~ Sonique Quote Share this post Link to post Share on other sites
freeflir29 0 #6 January 3, 2002 Yep...dump the FXC......OkK for students pulling high and I have seen them work at 1100 feet like they should. They just aren't accurate enough for my rig. Go with a Cypres or nothing......"I got some beers....Let's Drink em!!!"Clay Quote Share this post Link to post Share on other sites
SkydiveMonkey 0 #7 January 3, 2002 Personally, I would rather jump without one. The only AAD I like is the Astra ( because you can see if it's switched on and it's reliable). I like my women like I like my coffee - hot and with a spoon in Quote Share this post Link to post Share on other sites freeflir29 0 #8 January 3, 2002 "because you can see if it's switched on and it's reliable"Sounds just like a Cypres???"I got some beers....Let's Drink em!!!"Clay Quote Share this post Link to post Share on other sites PhreeZone 20 #9 January 3, 2002 Only bad thing about an Astra is they are really easy to bump into the off position. You could turn the Astra off and never know it. You also need to turn it off at the end of the day or it keeps draining the batteries unlike a Cypres that auto turns off.I want to touch the sky, I want to fly so high ~ Sonique Quote Share this post Link to post Share on other sites AggieDave 6 #10 January 3, 2002 Someone told me once that it wastes/uses more power to shut a Cypress off then to just let it turn off automatically. Is that true? Or does it really matter one way or another?Once you're gone, you can't come backWhen you're out of the blueAnd into the black-NeilYoung Quote Share this post Link to post Share on other sites SkydiveMonkey 0 #11 January 3, 2002 Quote Sounds just like a Cypres??? An Astra is MUCH easier to see the staus of due to the LED's. Plus it's normally in view, whereas the CyPReS display is normally under the reserve flap or other covered up spot. I like my women like I like my coffee - hot and with a spoon in Quote Share this post Link to post Share on other sites NtheSeaOrSky 0 #12 January 3, 2002 ? if they issue these in the military, can they really be that bad?Look at what you wrote!! Please tell me you don't use this justification for anything else!! Quote Share this post Link to post Share on other sites freeflir29 0 #13 January 3, 2002 "uses more power to shut a Cypress off then to just let it turn off automatically"That's what I've always been told. It makes since.....to turn that little light on 3 times and running the computer 3 times instead of just once for the auto shut off....."I got some beers....Let's Drink em!!!"Clay Quote Share this post Link to post Share on other sites freeflir29 0 #14 January 3, 2002 "if they issue these in the military, can they really be that bad?"Bad analogy...LOL I think it would be fine for military jumping....Hehehehe...They do open at 4500 ft..... "I got some beers....Let's Drink em!!!"Clay Quote Share this post Link to post Share on other sites mnischalke 0 #15 January 3, 2002 ? if they issue these in the military, can they really be that bad?they're not called expendable heros for nothing.mikeBlack and white are all I see, in my infancy... Quote Share this post Link to post Share on other sites weid14 0 #16 January 3, 2002 unless you've got it in your car and you're traveling over hilly terrain, then the CYPRES could be in active mode and will use more power. It does turn off after 14 hours. so if you're staying at the DZ, go ahead and leave it... a word of caution. If you're doing night jumps and you got to the DZ early in the morning and got going, you may want to cycle it off and on again. Quote Share this post Link to post Share on other sites hisgoofyness 0 #17 January 4, 2002 i was once one of those expendable heros in the air forceand i at least always got issued the best of the bestthanks guys for all your inputsounds like cypres or astra for mehisgoofynessits a bird, its a plane, no wait, its one goofy s.o.b. Quote Share this post Link to post Share on other sites DBTECH 0 #18 January 4, 2002 >>"uses more power to shut a Cypress off, then to just let it turn off automatically">That's what I've always been told. It makes since.....to turn that little light on 3 times >and running the computer 3 times instead of just once for the auto shut off.....DB> Until proven otherwise with data from the designer, I consider this total fallacy.An LED's current is about 12 milliamps (0.012 amps) The total time this LED is on when shutting down is about maybe five seconds. The energy the LED uses during this five seconds far exceeds the energy consumed by the computer 'during the shut down period'If we assume 0.012 amps at 6 volts for 5 seconds, that would be 0.36 watt seconds of energy.If we assume that the Cypres's current draw is 0.5 milliamp (0.0005 amp) during an 'on' period, of let's say, five hours, that would calculate to 54 watt seconds of energy-or 150 times the battery energy that would be needed for shutdown! (5 hrs is 18,000 seconds)Dave BrownellDB Technologies Quote Share this post Link to post Share on other sites skybytch 273 #19 January 4, 2002 QuoteUntil proven otherwise with data from the designer, I consider this total fallacyAirtec recommends letting the Cypres turn itself off. They say turning it off takes more out of the batteries than letting it stay on 14 hours and turn itself off.pull and flare,lisa Quote Share this post Link to post Share on other sites skybytch 273 #20 January 4, 2002 QuoteYou could turn the Astra off and never know it. You also need to turn it off at the end of the day or it keeps draining the batteries FXC recommends turning the Astra off once you're under canopy, or at the latest as soon as you land, on every jump or the batteries will wear out faster. It can't be left on all day long if you want the batteries to last.pull and flare,lisa Quote Share this post Link to post Share on other sites DBTECH 0 #21 January 4, 2002 Lisa said-->Airtec recommends letting the Cypres turn itself off. They say turning it off takes more >out of the batteries than letting it stay on 14 hours and turn itself off.DB> Is this what SSK Industries says, is it Airtek, or is it the designers themselves?Show me the numbers that support this claim.Dave Brownell Quote Share this post Link to post Share on other sites skybytch 273 #22 January 4, 2002 QuoteShow me the numbers that support this claim.I don't have numbers, I'm not an engineer. But you got me curious. The following is taken from SSK's website --"Should I turn my CYPRES off at the end of the day? There are a number of interesting rumors floating around theorizing that it takes less energy to just let CYPRES turn off by itself after 14 hours. Actually, it doesn't make that much difference. What can affect battery life is leaving CYPRES turned on, putting the rig in your car, driving off, and taking CYPRES through a 50 ft. or so change in elevation. CYPRES can interpret this as a take off in a slow-climbing aircraft, and go into a higher power mode of operation. This will put an additional drain on the battery. If at the start of the day CYPRES is still on from the previous day, it is a good idea to turn it off, then on again to reset the 14 hour turn-off timer."So apparently, what I thought was truth is merely a rumor. And from the date on the page that info was taken from (1995), it's an old rumor too. pull and flare,lisa Quote Share this post Link to post Share on other sites billvon 3,120 #23 January 5, 2002 >If we assume that the Cypres's current draw is 0.5 milliamp (0.0005 amp) during> an 'on' period, of let's say, five hours, that would calculate to 54 watt seconds of>energy-or 150 times the battery energy that would be needed for shutdown! >5 hrs is 18,000 seconds)I think that's a bit high. The 16LF877 from Microchip (typical FLASH based controller) takes 600uA at full speed, 35uA at low speed, and 1 uA when sleeping. If the CYPRES processor spends most of its time sleeping when on the ground (a scheme any sane programmer would implement) and it uses a similar processor, then you're looking at an average current of about 1.5uA, or 9uW. Over 14 hours that's about .45 watt-seconds, comparable to your estimate for the .36 watt-seconds needed for shutdown.-bill von Quote Share this post Link to post Share on other sites DBTECH 0 #24 January 5, 2002 >>If we assume that the Cypres's current draw is 0.5 milliamp (0.0005 amp) during>> an 'on' period, of let's say, five hours, that would calculate to 54 watt seconds of>>that energy-or 150 times the battery energy that would be needed for shutdown! >>5 hrs is 18,000 seconds)>I think that's a bit high. The 16LF877 from Microchip (typical FLASH>based controller) takes 600uA at full speed, 35uA at low speed, and 1 uA>when sleeping. If the CYPRES processor spends most of its time sleeping>when on the ground (a scheme any sane programmer would implement) and it>uses a similar processor, then you're looking at an average current of 1.5 uA, or 9 uW.>Over 14 hours, that's about .45 watt-seconds, comparable to your estimate for the >.36 watt-seconds needed for shutdown.-bill von DB> 1uA when sleeping-600uA at full speed--Do you know what the quiescent current is external to chip components--current level at the altitude sensor?--leakage current at fuseable link driver--(probably a pwr mos fet) Dave Brownell Quote Share this post Link to post Share on other sites BadDog 0 #25 January 5, 2002 See http://www.pia.com/SSK/cypres/cyp16.htm regarding whether or not to switch off your Cypres at the end of the day. I almost always switch mine off manually.CorporateLawyerDave aka BadDog Quote Share this post Link to post Share on other sites Prev 1 2 Next Page 1 of 2 Join the conversation You can post now and register later. 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freeflir29 0 #8 January 3, 2002 "because you can see if it's switched on and it's reliable"Sounds just like a Cypres???"I got some beers....Let's Drink em!!!"Clay Quote Share this post Link to post Share on other sites
PhreeZone 20 #9 January 3, 2002 Only bad thing about an Astra is they are really easy to bump into the off position. You could turn the Astra off and never know it. You also need to turn it off at the end of the day or it keeps draining the batteries unlike a Cypres that auto turns off.I want to touch the sky, I want to fly so high ~ Sonique Quote Share this post Link to post Share on other sites
AggieDave 6 #10 January 3, 2002 Someone told me once that it wastes/uses more power to shut a Cypress off then to just let it turn off automatically. Is that true? Or does it really matter one way or another?Once you're gone, you can't come backWhen you're out of the blueAnd into the black-NeilYoung Quote Share this post Link to post Share on other sites
SkydiveMonkey 0 #11 January 3, 2002 Quote Sounds just like a Cypres??? An Astra is MUCH easier to see the staus of due to the LED's. Plus it's normally in view, whereas the CyPReS display is normally under the reserve flap or other covered up spot. I like my women like I like my coffee - hot and with a spoon in Quote Share this post Link to post Share on other sites NtheSeaOrSky 0 #12 January 3, 2002 ? if they issue these in the military, can they really be that bad?Look at what you wrote!! Please tell me you don't use this justification for anything else!! Quote Share this post Link to post Share on other sites freeflir29 0 #13 January 3, 2002 "uses more power to shut a Cypress off then to just let it turn off automatically"That's what I've always been told. It makes since.....to turn that little light on 3 times and running the computer 3 times instead of just once for the auto shut off....."I got some beers....Let's Drink em!!!"Clay Quote Share this post Link to post Share on other sites freeflir29 0 #14 January 3, 2002 "if they issue these in the military, can they really be that bad?"Bad analogy...LOL I think it would be fine for military jumping....Hehehehe...They do open at 4500 ft..... "I got some beers....Let's Drink em!!!"Clay Quote Share this post Link to post Share on other sites mnischalke 0 #15 January 3, 2002 ? if they issue these in the military, can they really be that bad?they're not called expendable heros for nothing.mikeBlack and white are all I see, in my infancy... Quote Share this post Link to post Share on other sites weid14 0 #16 January 3, 2002 unless you've got it in your car and you're traveling over hilly terrain, then the CYPRES could be in active mode and will use more power. It does turn off after 14 hours. so if you're staying at the DZ, go ahead and leave it... a word of caution. If you're doing night jumps and you got to the DZ early in the morning and got going, you may want to cycle it off and on again. Quote Share this post Link to post Share on other sites hisgoofyness 0 #17 January 4, 2002 i was once one of those expendable heros in the air forceand i at least always got issued the best of the bestthanks guys for all your inputsounds like cypres or astra for mehisgoofynessits a bird, its a plane, no wait, its one goofy s.o.b. Quote Share this post Link to post Share on other sites DBTECH 0 #18 January 4, 2002 >>"uses more power to shut a Cypress off, then to just let it turn off automatically">That's what I've always been told. It makes since.....to turn that little light on 3 times >and running the computer 3 times instead of just once for the auto shut off.....DB> Until proven otherwise with data from the designer, I consider this total fallacy.An LED's current is about 12 milliamps (0.012 amps) The total time this LED is on when shutting down is about maybe five seconds. The energy the LED uses during this five seconds far exceeds the energy consumed by the computer 'during the shut down period'If we assume 0.012 amps at 6 volts for 5 seconds, that would be 0.36 watt seconds of energy.If we assume that the Cypres's current draw is 0.5 milliamp (0.0005 amp) during an 'on' period, of let's say, five hours, that would calculate to 54 watt seconds of energy-or 150 times the battery energy that would be needed for shutdown! (5 hrs is 18,000 seconds)Dave BrownellDB Technologies Quote Share this post Link to post Share on other sites skybytch 273 #19 January 4, 2002 QuoteUntil proven otherwise with data from the designer, I consider this total fallacyAirtec recommends letting the Cypres turn itself off. They say turning it off takes more out of the batteries than letting it stay on 14 hours and turn itself off.pull and flare,lisa Quote Share this post Link to post Share on other sites skybytch 273 #20 January 4, 2002 QuoteYou could turn the Astra off and never know it. You also need to turn it off at the end of the day or it keeps draining the batteries FXC recommends turning the Astra off once you're under canopy, or at the latest as soon as you land, on every jump or the batteries will wear out faster. It can't be left on all day long if you want the batteries to last.pull and flare,lisa Quote Share this post Link to post Share on other sites DBTECH 0 #21 January 4, 2002 Lisa said-->Airtec recommends letting the Cypres turn itself off. They say turning it off takes more >out of the batteries than letting it stay on 14 hours and turn itself off.DB> Is this what SSK Industries says, is it Airtek, or is it the designers themselves?Show me the numbers that support this claim.Dave Brownell Quote Share this post Link to post Share on other sites skybytch 273 #22 January 4, 2002 QuoteShow me the numbers that support this claim.I don't have numbers, I'm not an engineer. But you got me curious. The following is taken from SSK's website --"Should I turn my CYPRES off at the end of the day? There are a number of interesting rumors floating around theorizing that it takes less energy to just let CYPRES turn off by itself after 14 hours. Actually, it doesn't make that much difference. What can affect battery life is leaving CYPRES turned on, putting the rig in your car, driving off, and taking CYPRES through a 50 ft. or so change in elevation. CYPRES can interpret this as a take off in a slow-climbing aircraft, and go into a higher power mode of operation. This will put an additional drain on the battery. If at the start of the day CYPRES is still on from the previous day, it is a good idea to turn it off, then on again to reset the 14 hour turn-off timer."So apparently, what I thought was truth is merely a rumor. And from the date on the page that info was taken from (1995), it's an old rumor too. pull and flare,lisa Quote Share this post Link to post Share on other sites billvon 3,120 #23 January 5, 2002 >If we assume that the Cypres's current draw is 0.5 milliamp (0.0005 amp) during> an 'on' period, of let's say, five hours, that would calculate to 54 watt seconds of>energy-or 150 times the battery energy that would be needed for shutdown! >5 hrs is 18,000 seconds)I think that's a bit high. The 16LF877 from Microchip (typical FLASH based controller) takes 600uA at full speed, 35uA at low speed, and 1 uA when sleeping. If the CYPRES processor spends most of its time sleeping when on the ground (a scheme any sane programmer would implement) and it uses a similar processor, then you're looking at an average current of about 1.5uA, or 9uW. Over 14 hours that's about .45 watt-seconds, comparable to your estimate for the .36 watt-seconds needed for shutdown.-bill von Quote Share this post Link to post Share on other sites DBTECH 0 #24 January 5, 2002 >>If we assume that the Cypres's current draw is 0.5 milliamp (0.0005 amp) during>> an 'on' period, of let's say, five hours, that would calculate to 54 watt seconds of>>that energy-or 150 times the battery energy that would be needed for shutdown! >>5 hrs is 18,000 seconds)>I think that's a bit high. The 16LF877 from Microchip (typical FLASH>based controller) takes 600uA at full speed, 35uA at low speed, and 1 uA>when sleeping. If the CYPRES processor spends most of its time sleeping>when on the ground (a scheme any sane programmer would implement) and it>uses a similar processor, then you're looking at an average current of 1.5 uA, or 9 uW.>Over 14 hours, that's about .45 watt-seconds, comparable to your estimate for the >.36 watt-seconds needed for shutdown.-bill von DB> 1uA when sleeping-600uA at full speed--Do you know what the quiescent current is external to chip components--current level at the altitude sensor?--leakage current at fuseable link driver--(probably a pwr mos fet) Dave Brownell Quote Share this post Link to post Share on other sites BadDog 0 #25 January 5, 2002 See http://www.pia.com/SSK/cypres/cyp16.htm regarding whether or not to switch off your Cypres at the end of the day. I almost always switch mine off manually.CorporateLawyerDave aka BadDog Quote Share this post Link to post Share on other sites Prev 1 2 Next Page 1 of 2 Join the conversation You can post now and register later. If you have an account, sign in now to post with your account. Note: Your post will require moderator approval before it will be visible. Reply to this topic... × Pasted as rich text. Paste as plain text instead Only 75 emoji are allowed. × Your link has been automatically embedded. Display as a link instead × Your previous content has been restored. Clear editor × You cannot paste images directly. Upload or insert images from URL. Insert image from URL × Desktop Tablet Phone Submit Reply 0
NtheSeaOrSky 0 #12 January 3, 2002 ? if they issue these in the military, can they really be that bad?Look at what you wrote!! Please tell me you don't use this justification for anything else!! Quote Share this post Link to post Share on other sites
freeflir29 0 #13 January 3, 2002 "uses more power to shut a Cypress off then to just let it turn off automatically"That's what I've always been told. It makes since.....to turn that little light on 3 times and running the computer 3 times instead of just once for the auto shut off....."I got some beers....Let's Drink em!!!"Clay Quote Share this post Link to post Share on other sites
freeflir29 0 #14 January 3, 2002 "if they issue these in the military, can they really be that bad?"Bad analogy...LOL I think it would be fine for military jumping....Hehehehe...They do open at 4500 ft..... "I got some beers....Let's Drink em!!!"Clay Quote Share this post Link to post Share on other sites
mnischalke 0 #15 January 3, 2002 ? if they issue these in the military, can they really be that bad?they're not called expendable heros for nothing.mikeBlack and white are all I see, in my infancy... Quote Share this post Link to post Share on other sites
weid14 0 #16 January 3, 2002 unless you've got it in your car and you're traveling over hilly terrain, then the CYPRES could be in active mode and will use more power. It does turn off after 14 hours. so if you're staying at the DZ, go ahead and leave it... a word of caution. If you're doing night jumps and you got to the DZ early in the morning and got going, you may want to cycle it off and on again. Quote Share this post Link to post Share on other sites
hisgoofyness 0 #17 January 4, 2002 i was once one of those expendable heros in the air forceand i at least always got issued the best of the bestthanks guys for all your inputsounds like cypres or astra for mehisgoofynessits a bird, its a plane, no wait, its one goofy s.o.b. Quote Share this post Link to post Share on other sites
DBTECH 0 #18 January 4, 2002 >>"uses more power to shut a Cypress off, then to just let it turn off automatically">That's what I've always been told. It makes since.....to turn that little light on 3 times >and running the computer 3 times instead of just once for the auto shut off.....DB> Until proven otherwise with data from the designer, I consider this total fallacy.An LED's current is about 12 milliamps (0.012 amps) The total time this LED is on when shutting down is about maybe five seconds. The energy the LED uses during this five seconds far exceeds the energy consumed by the computer 'during the shut down period'If we assume 0.012 amps at 6 volts for 5 seconds, that would be 0.36 watt seconds of energy.If we assume that the Cypres's current draw is 0.5 milliamp (0.0005 amp) during an 'on' period, of let's say, five hours, that would calculate to 54 watt seconds of energy-or 150 times the battery energy that would be needed for shutdown! (5 hrs is 18,000 seconds)Dave BrownellDB Technologies Quote Share this post Link to post Share on other sites
skybytch 273 #19 January 4, 2002 QuoteUntil proven otherwise with data from the designer, I consider this total fallacyAirtec recommends letting the Cypres turn itself off. They say turning it off takes more out of the batteries than letting it stay on 14 hours and turn itself off.pull and flare,lisa Quote Share this post Link to post Share on other sites
skybytch 273 #20 January 4, 2002 QuoteYou could turn the Astra off and never know it. You also need to turn it off at the end of the day or it keeps draining the batteries FXC recommends turning the Astra off once you're under canopy, or at the latest as soon as you land, on every jump or the batteries will wear out faster. It can't be left on all day long if you want the batteries to last.pull and flare,lisa Quote Share this post Link to post Share on other sites
DBTECH 0 #21 January 4, 2002 Lisa said-->Airtec recommends letting the Cypres turn itself off. They say turning it off takes more >out of the batteries than letting it stay on 14 hours and turn itself off.DB> Is this what SSK Industries says, is it Airtek, or is it the designers themselves?Show me the numbers that support this claim.Dave Brownell Quote Share this post Link to post Share on other sites
skybytch 273 #22 January 4, 2002 QuoteShow me the numbers that support this claim.I don't have numbers, I'm not an engineer. But you got me curious. The following is taken from SSK's website --"Should I turn my CYPRES off at the end of the day? There are a number of interesting rumors floating around theorizing that it takes less energy to just let CYPRES turn off by itself after 14 hours. Actually, it doesn't make that much difference. What can affect battery life is leaving CYPRES turned on, putting the rig in your car, driving off, and taking CYPRES through a 50 ft. or so change in elevation. CYPRES can interpret this as a take off in a slow-climbing aircraft, and go into a higher power mode of operation. This will put an additional drain on the battery. If at the start of the day CYPRES is still on from the previous day, it is a good idea to turn it off, then on again to reset the 14 hour turn-off timer."So apparently, what I thought was truth is merely a rumor. And from the date on the page that info was taken from (1995), it's an old rumor too. pull and flare,lisa Quote Share this post Link to post Share on other sites
billvon 3,120 #23 January 5, 2002 >If we assume that the Cypres's current draw is 0.5 milliamp (0.0005 amp) during> an 'on' period, of let's say, five hours, that would calculate to 54 watt seconds of>energy-or 150 times the battery energy that would be needed for shutdown! >5 hrs is 18,000 seconds)I think that's a bit high. The 16LF877 from Microchip (typical FLASH based controller) takes 600uA at full speed, 35uA at low speed, and 1 uA when sleeping. If the CYPRES processor spends most of its time sleeping when on the ground (a scheme any sane programmer would implement) and it uses a similar processor, then you're looking at an average current of about 1.5uA, or 9uW. Over 14 hours that's about .45 watt-seconds, comparable to your estimate for the .36 watt-seconds needed for shutdown.-bill von Quote Share this post Link to post Share on other sites
DBTECH 0 #24 January 5, 2002 >>If we assume that the Cypres's current draw is 0.5 milliamp (0.0005 amp) during>> an 'on' period, of let's say, five hours, that would calculate to 54 watt seconds of>>that energy-or 150 times the battery energy that would be needed for shutdown! >>5 hrs is 18,000 seconds)>I think that's a bit high. The 16LF877 from Microchip (typical FLASH>based controller) takes 600uA at full speed, 35uA at low speed, and 1 uA>when sleeping. If the CYPRES processor spends most of its time sleeping>when on the ground (a scheme any sane programmer would implement) and it>uses a similar processor, then you're looking at an average current of 1.5 uA, or 9 uW.>Over 14 hours, that's about .45 watt-seconds, comparable to your estimate for the >.36 watt-seconds needed for shutdown.-bill von DB> 1uA when sleeping-600uA at full speed--Do you know what the quiescent current is external to chip components--current level at the altitude sensor?--leakage current at fuseable link driver--(probably a pwr mos fet) Dave Brownell Quote Share this post Link to post Share on other sites
BadDog 0 #25 January 5, 2002 See http://www.pia.com/SSK/cypres/cyp16.htm regarding whether or not to switch off your Cypres at the end of the day. I almost always switch mine off manually.CorporateLawyerDave aka BadDog Quote Share this post Link to post Share on other sites
