I2C measurement of Rising time and Falling time in Fast mode

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I2C measurement of Rising time and Falling time in Fast mode

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benny_lee
Contributor I

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

nxp.png

The I2C-bus spec

I2c.png

thanks.

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