CC3230SF: Internal pull-up resistors for I2C

Hamza Imtiaz

Part Number: CC3230SF

Tool/software:

Hi,

I'm working with I2C and noticed that syscfg doesn't seem to offer an option to enable internal pull-up resistors for the I2C lines. Can internal pull-up resistors be used with I2C, or are external pull-ups always required?

Thanks

over 1 year ago

+1 Josh Smith over 1 year ago

TI__Expert 4255 points

Hi Hamza,

CC3230SF does not support internal pull-up resistors. For proper operation, the SDA and SCL pin must be configured as an open-drain signal. Both SDA and SCL signals must be connected to a positive supply voltage using an external pullup resistor

Best,

Josh

0 Hamza Imtiaz over 1 year ago in reply to Josh Smith

Prodigy 220 points

How can we calculate the value of external pull-up resistors?

0 Josh Smith over 1 year ago in reply to Hamza Imtiaz

TI__Expert 4255 points

Hi Hamza,

External Pull up values can be found in the TRM. See section 7.2:

Best,

Josh

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CC3230SF: Internal pull-up resistors for I2C