Jan 14, 2009 #1 L leowell Newbie level 4 Joined Nov 28, 2006 Messages 5 Helped 0 Reputation 0 Reaction score 0 Trophy points 1,281 Activity points 1,300 NO POWER VDD IF i have no power , i use three digital level to get VDD , how to do ! at least one of three digital level is high.
NO POWER VDD IF i have no power , i use three digital level to get VDD , how to do ! at least one of three digital level is high.
Jan 14, 2009 #2 radiohead Advanced Member level 1 Joined May 13, 2004 Messages 447 Helped 66 Reputation 128 Reaction score 31 Trophy points 1,308 Location Heart of Europe Activity points 3,562 Re: NO POWER VDD Add a driver stage: a p-type mosfet with drain attached to the VCC rail and gate biased by the digital output should work fine. Be sure that the mosfet is dimensioned well and can handle the current you need to sink.
Re: NO POWER VDD Add a driver stage: a p-type mosfet with drain attached to the VCC rail and gate biased by the digital output should work fine. Be sure that the mosfet is dimensioned well and can handle the current you need to sink.
Jan 14, 2009 #3 L leowell Newbie level 4 Joined Nov 28, 2006 Messages 5 Helped 0 Reputation 0 Reaction score 0 Trophy points 1,281 Activity points 1,300 NO POWER VDD that is diode?