ov7620 OmniVision Technologies, Inc, ov7620 Datasheet - Page 26

• Manufacturer Part Number: ov7620
• Description: Single-chip Cmos Vga Color Digital Camera
• Manufacturer: OmniVision Technologies, Inc

Preliminary
Company Confidential
OV7620/OV7120 Product Specifications - Rev. 1.2 (7/10/01)
OMNIVISION TECHNOLOGIES INC.
0.10 SCCB BUS
SCCB access is enabled only if pin
=0. OV7620/OV7120 is a slave device that supports
SBB
400kbit/s 7bit address data transfer protocol. Within each byte, MSB is always transferred first,
read/write control bit is the LSB of the first byte
The protocol requires
must be stable during the HIGH period of the
. Each data bit can
SIO-0
SIO-1
only change state when is
LOW.
SIO-1
OV7620/OV7120 reserves
for the slave ID, which makes eight slave camera combina-
CS(2:0)
tions.
OV7620/OV7120 SCCB supports multi-byte write and multi-byte read. In a write cycle, the mas-
ter must supply the subaddress, however, the master does not supply the subaddress in the read
cycle, therefore, OV7620/OV7120 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 continuous locations can be accessed in one bus cycle. Since a multi-byte cycle
overwrites its original 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/OV7120 support 400 kBit/s fast SCCB mode, system clock (CLK) must be at least 10
Mhz.