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Published 20 hours ago • verified publisher icon ComputerNerd

"pullup resistors to 3.3v for both SIOC and SIOD"

Open ThomasStock opened this issue 8 years ago • 1 comments

Novice here. I have been googling what pullup resistors are but I do not understand how "pullup resistors to 3.3v for both SIOC and SIOD" must be interpreted. Could you explain the schematic?

ThomasStock avatar Jun 07 '16 09:06 ThomasStock

I have found an explanation here: https://learn.sparkfun.com/tutorials/i2c "I2C at the Hardware Level" provides a schematic.

This made me understand it: "Unlike UART or SPI connections, the I2C bus drivers are “open drain”, meaning that they can pull the corresponding signal line low, but cannot drive it high."

ThomasStock avatar Jun 07 '16 10:06 ThomasStock