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Is CLK open drain in I2C protocol?

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Yes. Make sure you connect a pull-up resistor.
 
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what if i am doing I2C from a PIC that doesnt have an I2C module?

Does that mean i have to use two external open drain BJTs and have separate input and output ports?....ie four pins of the pic used to give the I2C protocol?
 

If you're using a PIC that doesn't have an I2C module, then you'll be using software I2C. The two pins you'll use as CLK (SCL) and DATA (SDA) should be pulled up using pull up resistors. No need to use external BJTs.
 
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....if i do that , does that mean i have to transmit by changing a pin repeatedly from output low to high Z?

....i would have thought taking a PIC pin output high was prohibited because it would short to ground via the slaves I2C port?


...changing a pic pin repeatedly from output low to high z is not going to be quick or easy?

...
 

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