I2C Hardwire

[Ron]

Hi,

I was reading through some I2C posts and found a reply by Ben. In it Ben states that the I2C lines need to be pulled up. Is this a requirement for all I2C programming (even if it is not done via I2C macros)?

I was about to order some PCBs that I designed and am using the I2C lines to talk to dedicated PCBs that I am going to use for servo and LED control.

Should I use 10K resistors to pull up the I2C lines?

Thanks

Ron

[Benj]

Hello Ron

Yes your I2C lines SDA and SCL should both have pull up resistors of approx 4.7 - 10K to 5V.

[Xsusakamei]

Hello!

For faster Speed the Pull-Ups must have 1,8k!
I use 2,2k for 400kb Speed and it works fine.

Xsusakamei