Author Topic: OV7725  (Read 1557 times)

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Offline blacksonTopic starter

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OV7725
« on: September 04, 2011, 03:41:28 PM »
I am trying to make sense of the datasheet for the OV7725 (I bought from Surveyor Corporation).  In particular, I am trying to understand the HSTART, HSIZE, VSTRT, VSIZE, HOutSize, VOutSize, and HREF registers.  I understand generally what these registers control, but I am perplexed by some of the defaults.  So, e.g., the defaults in HSTART for VGA and QVGA is 26 and 3F.  What is the relationship between these two numbers?  Also, in VSTRT, the defaults for VGA and QVGA are 7 and 3.  Why should the default for QVGA be smaller?  I hope someone out there has some experience with this sensor or with omnivision sensors generally.  I have attached some snapshots of the datasheet description of the registers I have mentioned. Thanks so much!

 


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