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I2C measurement of Rising time and Falling time in Fast mode

Question asked by Benny Lee on Oct 17, 2018

Hi engineer,

 

I have a question, in  "NXP Doc. UM10204 I2C-bus specification and user manual Rev. 6 — 4 April 2014"  tr and tf are 30%~70%; but in "THE I 2C-BUS SPECIFICATION Ver 2.1 JANUARY 2000" tr and tf seem like 10%~90%.

 

Our device which is Touchpad is working in Fast-mode.

 

Could you tell me why it is changed? Because, when I was a studenet, I read the spec of Rising time and falling time is  10%~90%.

 

Nxp spec

The I2C-bus spec

thanks.

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