AM437x - I2C Pull-ups

Kanae

Hello,

I would like to make sure which value I should recommend my customer?

1. AM437x_Schematic_Checklist#I2C : pullups on both I2C signals (I2C_DATA and I2C_CLK) should be 4.7K. http://processors.wiki.ti.com/index.php/AM437x_Schematic_Checklist#I2C

2. AM437x ISDK schematic : pullups on both I2C signals (I2C_DATA and I2C_CLK) should be 2.2K. http://processors.wiki.ti.com/images/b/ba/AM437X_INDUSTRIAL_EVM_3K0008_schematic_REV1_3A.pdf

My understanding is EVM is not reference design, so I should follow the AM437x_Schematic_Checklis; 4.7K.

Best regards,
Kanae

over 11 years ago

0 Biser Gatchev-XID over 11 years ago

TI__Guru**** 393215 points

Hi Kanae-san,

For common use cases the Schematic Checklist should be followed. There are a lot of materials for I2C pullup calculation on the Internet. Here is an example: http://www.edn.com/design/analog/4371297/Design-calculations-for-robust-I2C-communications

0 Kanae over 11 years ago in reply to Biser Gatchev-XID

Guru 10245 points

Biser-san,

Thank you for your quick reply!
I will recommend the the Schematic Checklist value as use cases to our customer.

Best Regards,
Kanae

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AM437x - I2C Pull-ups