Another ICD2 3.3v target question? - Electronic Circuits Projects Diagrams Free

Mike, K8LH · 27th August 2007, 01:43 PM

Someone recently posted a nifty bi-directional non-inverting level shifter circuit from a Philips application note that uses an N-channel MOSTFET.

Could I impose on the electronics experts amoung us to ask if the 3.3v side of this circuit could be used for both 5v and 3.3v devices? That is, could I use a jumper on my ICD2 board to connect either 5v or 3.3v to the pull-up resistor on that side of the circuit and would it still work correctly?

justDIY · 27th August 2007, 03:34 PM

The app note that circuit came from explains why it works the way it does, and I believe it relies on the fact the voltages are different.

Here's the app note; perhaps it has the answers for you

http://wwwasic.kip.uni-heidelberg.de...al/AN97055.pdf

Another idea to consider, wire a jumper block so the 3.3v side of the data line is connected to the shifter or directly to the 5v side of the data line.

Mike, K8LH · 27th August 2007, 05:01 PM

I'm embarrassed to say I didn't think of that (grin).

Thank you Sir!

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27th August 2007, 01:43 PM	(permalink)
Mike, K8LH	Another ICD2 3.3v target question? Someone recently posted a nifty bi-directional non-inverting level shifter circuit from a Philips application note that uses an N-channel MOSTFET. Could I impose on the electronics experts amoung us to ask if the 3.3v side of this circuit could be used for both 5v and 3.3v devices? That is, could I use a jumper on my ICD2 board to connect either 5v or 3.3v to the pull-up resistor on that side of the circuit and would it still work correctly?

27th August 2007, 03:34 PM	(permalink)
justDIY	The app note that circuit came from explains why it works the way it does, and I believe it relies on the fact the voltages are different. Here's the app note; perhaps it has the answers for you http://wwwasic.kip.uni-heidelberg.de...al/AN97055.pdf Another idea to consider, wire a jumper block so the 3.3v side of the data line is connected to the shifter or directly to the 5v side of the data line. __________________ If you don't have a planet, what good are gold bars? want to contact me directly? gmail gordonthree check out my project website: http://projects.dimension-x.net Favorite numbers: 09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0

27th August 2007, 05:01 PM	(permalink)
Mike, K8LH	I'm embarrassed to say I didn't think of that (grin). Thank you Sir!