ST92F150 electrical characteristics - I2C

frederic239955 · ‎2003-06-27

Posted on June 27, 2003 at 09:47

frederic239955 · ‎2011-05-17

Posted on May 17, 2011 at 11:34

Hi,

I have some problems with ST92F150 electrical characteristics for IOs Schmitt trigger (vih,vil,hyst), especially for I2C.

For me, Hyst = Vih - Vil, but ST9 specs do not fit with this equation.

Could anyone clarify this point ?

I want to drive a 3.3V ST I2C EEPROM using ST92F150 (5V) and I need to know how to connect components . Are external pull-ups to 3.3V only required ?

(Is ST92F150 I2C peripheral compatible with 3.3V parts ?)

Thanks

sjo · ‎2011-05-17

Posted on May 17, 2011 at 11:34

Have alook at the phillips I2C bus spec, it gives you info about level translation at the end of the doc using fets.

I have attached if you do not have it.

Regards

Spen

frederic239955 · ‎2011-05-17

Posted on May 17, 2011 at 11:34

Spen,

Thanks for the I2C specs.

But my question is more simple :

Is ST92F150 (5V) work with 3.3V devices with only 3.3V pull-ups on SDA and SCL lines ?

fred.

frederic239955 · ‎2011-05-17

Posted on May 17, 2011 at 11:34

Spen,

I found information I need in I2C specs you sent me.

Thanks.

Fred.