INA237: i2c interface

Anoop M

Intellectual 440 points

Part Number: INA237

Hi team,

I have connected eight (INA237)devices in a single bus. I doubt it will affect the racing time.

What are the Pin Capacitance (SDA, SCL) and the total capacitance of one bus line Cb?

Thanks, Regards

Anoop Varma m

over 2 years ago

0 Mitch M over 2 years ago

TI__Mastermind 22065 points

Hello Anoop,

Thank you for using the TI forum. The SDA and SCL pins have a typical pin input capacitance of 3pF each.

0 Anoop M over 2 years ago in reply to Mitch M

Intellectual 440 points

Hi Mitch M,

Thanks for your reply,

The total max capacitance of one bus line (Cb) 400pf?

Need an i2c Accelerator?

pull up I added 4.7K.

+1 Mitch M over 2 years ago in reply to Anoop M

TI__Mastermind 22065 points

Hello Anoop,

The total max capacitance of one bus line is an I2C protocol specification, and our device works with the standard I2C protocol. That being said, the max bus capacitance could depend on which MCU you are using and any other devices you have on the bus, as well as the speed you are communicating at.

I have tested 4 devices on the bus with 4.7KΩ pull up resistors, running in High Speed mode without an accelerator, and had zero issues. I don't think 8 would be a problem, but that really depends on your frequency/MCU etc.

0 Anoop M over 2 years ago in reply to Mitch M

Intellectual 440 points

Hello Mitch,

Thanks for your valuable reply

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INA237: i2c interface