[minima] Re: Yet more on Wire.h / I2C FET Interface...
- From: "Steve VK2SJA" <vk2sja@xxxxxxxxxxx>
- To: minima@xxxxxxxxxxxxx
- Date: Wed, 12 Feb 2014 15:49:02 +1100
Hi Mike,
> I'm still thinking there are some speed or timing that is affected by the
> higher gate threshold value of a BS170/2N7000 (but, as I told Mac:
> "I'm not an EE, but I play one on TV...").
I'm not an EE either. And I've never played anything on a TV! (Well
excepting VCRs and DVDs perhaps).
But I'm thinking your dead right.
http://playground.arduino.cc/Main/I2CBi-directionalLevelShifter
Contains the The Philips Applications Note AN97055 circuit followed by the
specific reference:-
"The mosfets must be types that activate with a very low gate voltage. For
example mosfet BSS138 or TN2501."
How did you get on with 'low gate threshold' FETs you had on order?
73, Steve.
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