Quote:
Originally Posted by bebek
You can see 2 4.7k resistors close to 16 pin of IC. These are pull ups for SDA/scl lines.
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Hmmm you're right. I have a board just like that one and indeed the pullups are on board. I have another board, different layout, does not have them.
Guess the answer is to check resistance to Vcc before bothering to add pullups
