Perhaps I'm misunderstanding something Olin but to me "serial resistors in
the scl and sda wire" does NOT sound like he/she is using those resistors
for pullups. While out of spec I don't understand how putting a 600ohm
resitor in series with either the scl or sda lines has any chance of harming
an I2C part. TTYL

> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Olin Lathrop
> Sent: Thursday, February 28, 2002 07:53
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [PIC]: I2C Questions
>
>
> > i have a star topology with serial resistors
> > (about600..800 ohms) in the scl and sda wires at each node.
> > that works fine!
>
> Don't try this at home, folks.  A number of standard IIC devices may not
> work this way, or may even get damaged.  The IIC bus is specified with a
> maximum sink current of 3mA on each line.  If you're going to recommend
> something like this, please point out that you are only using IIC
> protocol,
> not true IIC.  I assume you are using your own line drivers and not
> connecting off the shelf IIC devices to the bus, right?
>
>
> ********************************************************************
> Olin Lathrop, embedded systems consultant in Littleton Massachusetts
> (978) 742-9014, olin@embedinc.com, http://www.embedinc.com
>
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>
>

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