I have a Question regarding i2c lines,

Zulander · Joined: 04 Dec 2006 Posts: 14

Hi,

Do I need to put a pull-up resistor from each device that is on a circuit or I can put one pull-up resistor for the whole circuit?

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

Two pull-up resistors are required for each i2c bus.
You need one for SDA, and one for SCL. To answer
your question, just two resistors are required for the
whole circuit.

How many i2c slave chips are you planning to put on
one i2c bus ? This could affect the value of the
pull-up resistors. What slave chips will you be using ?

Zulander · Joined: 04 Dec 2006 Posts: 14

Well PCM programmer,
I don�t have any ICs yet, it was a general question what I was thinking I wasn�t sure. For how I have two but I might have more. I don�t know! Is their away I can calculate it ?
Thank you
P.S: Happy holidays !