STM32F072V8T6 capacitance and rise time of for I2C

[murali]

I want to know the Bus capacitance and Rise time of STM32F072V8T6 for I2C Calculation, Anyone who has know kindly tell me. Thank you. 

[Andrew Neil]

The capacitance of the bus, as the name suggests,  is defined by the whole bus - not just the microcontroller!

IO pin capacitance will be in the chip's Datasheet - under electrical characteristics:

The following pages give further AC characteristics

See also:

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@murali wrote:

 and Rise time . 

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Again, that is defined by the external bus - not the microcontroller.

Specifically, it is defined by your pull-up resistors.

See this post: 

https://electronics.stackexchange.com/questions/1849/is-there-a-correct-resistance-value-for-i2c-pull-up-resistors/473799#473799

It contains this diagram - which shows you the effect of the pullup value:

 

 

 

[murali]

Thank you

[murali]

Hi Andrew Neil,

 

                  Would you inform me of the Hold time of SDA? I want to configure with LT8491 IC of which hole time is at least 300 ns needed.