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Altera_Forum
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18 years ago

Help: HSMC and I2C

I am having a hell of a time trying to interface a camera through an HSMC - Santa Cruz adapter board (THDB-H2S - http://www.terasic.com.tw/cgi-bin/page/archive.pl?language=english&categoryno=39&no=21...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
18 years ago

Ah I see.

I am a little cloudy on how I would go about using an external pull up. I suppose I would connect a 3.3V source behind a 1k-4.7k resistor connected to the i2c data line. But can I connect this anywhere along the signal path?

Another idea:

What if I turned off pci coupling and interfaced the boards as 3.3v - 3.3v? Might this reduce capacitance from level shifting and help the internal weak pull up to work?