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| Search found 23 matches |
| Author | Message |
|---|---|
 Topic: OT:1-wire iButton protection |
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| cstan_02 Replies: 3 Views: 5753 |
 Forum: General CCS C Discussion Posted: Mon Mar 26, 2007 1:15 am Subject: Any way to do this? |
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Schottky 33 Ohm PIN_B0-------------------------|>|-------------/\/\/\/----------------|Reader data line | | ... |
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| Topic: OT:1-wire iButton protection |
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| cstan_02 Replies: 3 Views: 5753 |
Forum: General CCS C Discussion Posted: Sun Mar 25, 2007 10:03 pm Subject: Oops! |
The picture that i draw does not appear exactly as i thought it would. Too bad that we can't upload pictures drectly.  |
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| Topic: OT:1-wire iButton protection |
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| cstan_02 Replies: 3 Views: 5753 |
Forum: General CCS C Discussion Posted: Sun Mar 25, 2007 9:06 pm Subject: OT:1-wire iButton protection |
| I have done this i-button reader of which the MCU is PIC16LF73 working with 3V. Now that's not at all the problem. The 1-wire data line is connected to the PIC pin directly with just a few ohms of res ... | |
| Topic: Reverse Polarity Protection |
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| cstan_02 Replies: 32 Views: 35135 |
Forum: General CCS C Discussion Posted: Fri Feb 17, 2006 8:16 pm Subject: Reverse Polarity Protection |
| I think the following diagram describes his circuit. On the left side, the
board plugs into the cigarette lighter socket and connects to +12v and ground. I've shown an inline diode on the +12v lin ... |
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| Topic: Reverse Polarity Protection |
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| cstan_02 Replies: 32 Views: 35135 |
Forum: General CCS C Discussion Posted: Thu Feb 16, 2006 7:21 pm Subject: Reverse Polarity Protection |
| The above mentioned app is always standby and if the mains is cutoff, it has to survive with a single nokia Li-ion battery for a few hours as well..
Easy to make a work around for this, but still it ... |
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| Topic: Reverse Polarity Protection |
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| cstan_02 Replies: 32 Views: 35135 |
Forum: General CCS C Discussion Posted: Tue Feb 14, 2006 7:17 pm Subject: Reverse Polarity Protection |
| Hello PCM, sorry if i have never made it clear.. The circuit is just too simple and that's why i omitted it.. The antennae are mounted on the box which originates from the board. These antennas are fo ... | |
| Topic: Reverse Polarity Protection |
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| cstan_02 Replies: 32 Views: 35135 |
Forum: General CCS C Discussion Posted: Sun Feb 12, 2006 7:33 pm Subject: Reverse Polarity Protection |
| Hello gs, it is a good solution but we can't afford to let the customers change the fuse themselves.. it's a kind of hidden thing and it's supposed to be fail safe all the time, no matter what they do ... | |
| Topic: Reverse Polarity Protection |
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| cstan_02 Replies: 32 Views: 35135 |
Forum: General CCS C Discussion Posted: Fri Feb 10, 2006 7:34 pm Subject: Reverse Polarity Protection |
| Okay this is what my perception is ..
When we connect a diode on the ground for protection, there is a voltage drop on that terminal and the ground does not become the true ground.. Since this app is ... |
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| Topic: Reverse Polarity Protection |
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| cstan_02 Replies: 32 Views: 35135 |
Forum: General CCS C Discussion Posted: Thu Feb 09, 2006 7:57 pm Subject: Reverse Polarity Protection |
| Thanks PCM. Antenna is from my application.. The app that I'm describing has atleast two antennas connected from the board.. The casing of the unit is aluminium and the antenna connectors are attatche ... | |
| Topic: Reverse Polarity Protection |
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| cstan_02 Replies: 32 Views: 35135 |
Forum: General CCS C Discussion Posted: Wed Feb 08, 2006 7:35 pm Subject: Reverse Polarity Protection |
| Thanks PCM, but that diode does exist in our board.. the problem is when you apply reverse polarity, the antenna ground is connected to the chasis of the vehicle(shared). So this diode can't protect t ... | |
| Topic: Reverse Polarity Protection |
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| cstan_02 Replies: 32 Views: 35135 |
Forum: General CCS C Discussion Posted: Tue Feb 07, 2006 8:11 pm Subject: Reverse Polarity Protection |
| Thanks all..
We indeed had the TVS in the circuit. But, as PCM pointed out sometimes it does fail and we don't use fuses and that made the whole of the board useless.. As for the diode brid ... |
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| Topic: Reverse Polarity Protection |
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| cstan_02 Replies: 32 Views: 35135 |
Forum: General CCS C Discussion Posted: Mon Feb 06, 2006 8:15 pm Subject: Reverse Polarity Protection |
| Sorry for a bit off topic.. I already have a working board for an automative app for which i intend to do some reverse polarity protection using very minimal discrete components.. Is it bad to protect ... | |
| Topic: USB MSD |
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| cstan_02 Replies: 0 Views: 4344 |
Forum: General CCS C Discussion Posted: Thu Feb 02, 2006 8:20 pm Subject: USB MSD |
| Does anyone have the following Microchip USB-MSD drivers ported to CCS ??
[url=http://ww1.microchip.com/downloads/en/appnotes/01003a.pdf]Application Note 1003 and [url=http://ww1.microchip ... |
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| Topic: My 6722 died yesterday !! |
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| cstan_02 Replies: 6 Views: 8437 |
Forum: General CCS C Discussion Posted: Fri Dec 16, 2005 3:21 am Subject: My 6722 died yesterday !! |
| Thanks Andrew, have a nice day !!
:-) |
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| Topic: My 6722 died yesterday !! |
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| cstan_02 Replies: 6 Views: 8437 |
Forum: General CCS C Discussion Posted: Fri Dec 16, 2005 12:37 am Subject: My 6722 died yesterday !! |
| Thanks Andrew, I'll try to take care of the latchup problem next time. But is there any sure way of preventing this, like if i power everything in the circuit with a single supply, will it eleminate t ... | |
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