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Message
From: Steve Wilson<stevew@k...>
Date: Tue Sep 25 16:10:36 CEST 2007
Subject: [oc] i2c Slave Design Ideas
tkafafi@h... Wrote:
>If you do not think noise will be an issue in your environment you can
>the SCL as a clock. However, for detecting start and stop consitions, I
>recall that you need to use SDA as the clock and SCL as the data.
Let me confirm this point. The I2C specification requires the rejection of up
to 50ns duration glitches. So use of a digital delay line that requires
multiple clocks worth of stability is a must to get I2C to work.
Don't forget that you can be driving up to 400pf worth of load - and the bus
is going to have significant reflections.
That digital filter seems to be a requirement in any significant (large)
applications - and least anything not point to point.
Steve Wilson
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