pmeerw's blog

Fri, 13 Apr 2012

SCCB is not I2C

When reading the descriptions of the I2C protocoll or some other two-wire interface that behaves like I2C in a random datasheet, one often has the impression to have discovered a totally new protocoll. The same thing is described differently, every time!

However, SCCB (serial camera control bus), Omnivision's I2C variant is different: the ACK bit (the 9th bit after each byte of data transmission) does not indicate ACK or NAK but is set at random -- the I2C master is supposed to ignore it.

posted at: 10:50 | path: /projects | permanent link

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