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andy1
Joined: 24 Jul 2004
Posts: 124
Helped: 2
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 26 Dec 2004 7:36 How to design for hot-swapping |
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What needed to ensure hot-swapping for a embbeded micro-controller board to be plugged into a PCI slot?
There are PCI target interface IC that supports hot-swapping but how would you handel power supply to the board and to the CPU that also on the board?
What do you need to do?
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shutter_man
Joined: 05 Dec 2004
Posts: 13
Helped: 3
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| 27 Dec 2004 8:29 Re: How to design for hot-swapping |
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Hi
Hot swapping requires you to ensure correct "powering up" your card.
For example: if only 3.3v supply is in used: connect a P-channel fet - Source to the 3.3v pin, resistor between S and G, and connect the G to the GND. the circuit will be powered by the D of the fet.
What have you got? - if the 3.3v is connected without the GND - FET will not open - card will not get VCC without GND... You can extrapolate for extra connection and powering sequence.
Also smart to note: hot swapping many time ends with misconnections (user insert part of the card with miss-alignment) and result with power pins connected to the wrong inputs - diode are used for protection at the appropriate places.
Shutter_man
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andy1
Joined: 24 Jul 2004
Posts: 124
Helped: 2
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| 27 Dec 2004 19:17 Re: How to design for hot-swapping |
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I found this on the web from Maxim :
http://www.maxim-ic.com/appnotes.cfm/appnote_number/2736
They have quite a few IC for this type of thing.
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