I2C BUS SPEED

a3b · ‎2004-02-23

Posted on February 23, 2004 at 13:31

I2C BUS SPEED

a3b · ‎2011-05-17

Posted on May 17, 2011 at 11:58

On a particular design, I have componants with different Bitrate under i2C such as:

1 24C02 E2PROM at 400 KHz,

2 X UPSD up to 750 KHZ using 24 Mhz XTal,

1 DS1307 Clock at 100 Khz.

does anybody know this:

Can I use different bitrates : 750 Khz to communicate between UPSD, 400 KHz from upsd to E2PROM, 100 Khz from UPSD to Clock ?

Or am I obliged to run at minimum speed 100 KHz ?

sjo · ‎2011-05-17

Posted on May 17, 2011 at 11:58

You will have to comply with the minimum speed device, eg. 100KHz.

I2C devices are only upwardly compatible.

A possible solution is bridging - have a look at the latest I2C spec which mentions this.

Regards

sjo

[ This message was edited by: sjo on 23-02-2004 17:44 ]

a3b · ‎2011-05-17

Posted on May 17, 2011 at 11:58

Thank you for your answer.