How to design for hot-swapping

[andy1]

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?

 

[shutter_man]

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

 

[andy1]

I found this on the web from Maxim :

**broken link removed**

They have quite a few IC for this type of thing.