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i2c bus speed? Is there a limit beyond 400kHz?


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#1 philvr

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Posted 18 November 2013 - 04:45 PM

I've had two MCP23017 digital i/o chips running well at 400kHz. But running at 1MHz is unsuccessful. I've tried tweaking the bus pull up resistors. Has anyone run I2C at 1MHz? Or Faster? I'd like to know what can be achieved. NDP2 with f/w 4.2.2.2 using MultiI2C (thanks NooM)

#2 NooM

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Posted 19 November 2013 - 09:57 AM

stm32 chips only support 400khz max i2c.


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#3 philvr

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Posted 19 November 2013 - 11:04 AM

Thanks. I should have read the data sheet...

 

Another question is just how reliable is the netduino I2C firmware? Has anyone stress tested the i2c implementation? As I am moving toward a commercial product it would be interesting to develop an idea of how robust it is.






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