OV7620 datasheet(25/60 Pages) ETC

25 / 60 page

OV7620 Product Specifications - Rev. 1.2 (5/13/00)

OMNIVISION TECHNOLOGIES INC.

Preliminary Company Confidential

1.12 SCCB BUS

SCCB access is enabled only if pin SBB=0. OV7620 is a slave device that supports 400kbit/s 7bit

address data transfer protocol. Within each byte, MSB is always transferred first, read/write con-

trol bit is the LSB of the first byte

The protocol requires SIO-0 must be stable during the HIGH period of the SIO-1. Each data bit can

only change state when is SIO-1 LOW.

OV7620 reserves CS(2:0) for the slave ID, which makes eight slave camera combinations.

OV7620 SCCB supports multi-byte write and multi-byte read. In a write cycle, the master must

supply the subaddress, however, the master does not supply the subaddress in the read cycle,

therefore, OV7620 takes the read subaddress from the previous write cycle. In multi-byte write

or multi-byte read cycles, the subaddress is auto increment after the first data byte so that con-

tinuous locations can be accessed in one bus cycle. Since a multi-byte cycle overwrites its orig-

inal subaddress, if a read cycle follows immediately to a multi-byte cycle, it is necessary to insert

a single byte write cycle that provides a new subaddress.

If OV7620 support 400 kBit/s fast SCCB mode, system clock (CLK) must be at least 10 Mhz.

OV7620 Datasheet(PDF) 25 Page - List of Unclassifed Manufacturers