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I2C MOSFET's

Discussion in 'Electronic Basics' started by Ed, Dec 4, 2003.

  1. Ed

    Ed Guest

    Hello,

    I need to use a 3.3V device with the 5V I2C bus. In the I2C
    specification it recommends using MOSFET's to do the level conversion.
    Can anyone recommend any MOSFET's to do it? I need to run at 400KHz.

    Thanks,
     

  2. Your post is kind of terse but I assume you are trying to do level shifting
    like demonstrated in figure 2 of this document:

    http://www.semiconductors.philips.com/acrobat/applicationnotes/AN97055.pdf

    If my assumption is true and you are trying to use this most crafty scheme
    (it makes use of the integral body diode of the MOSFET) then any small
    MOSFET with a low threshold voltage should work. Something like the BSS138
    for instance might be a good choice.
     
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