Another ICD2 3.3v target question?

[Mike - K8LH]

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?

**broken link removed**

 

[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

https://www.electro-tech-online.com/custompdfs/2007/08/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]

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

Thank you Sir!