OV6620 Datasheet, PDF (23/31 Pages) List of Unclassifed Manufacturers – SINGLE-CHIP CMOS CIF COLOR DIGITAL CAMERA

OMNIVISION TECHNOLOGIES, Inc.
Advanced Information
Preliminary
OV6620/OV6120
SINGLE IC CMOS COLOR AND B/W DIGITAL CAMERAS
3. I²C Bus
Many of the functions and configuration registers in the
OV6620/OV6120 image sensors are available through
the I²C interface. The I²C port is enabled by asserting
the I2CB line (pin 12) through a 10K ohm resistor to
V_DD. When the I²C capability is enabled (I2CB = 1), the
OV6620/OV6120 imager operates as a slave device
that supports up to 400 kbps serial transfer rate using a
7-bit address/data transfer protocol .
1ST BYTE
2ND BYTE
3RD BYTE
S SLAVE ID (7 BITS) RW A SUBADDRESS (8 BITS) A
DATA (8 BITS)
AP
MSB
START
LSB=0
ACK
MASTER TRANSMIT, SLAVE RECEIVE (WRITE CYCLE)
ACK
STOP
1ST BYTE
2ND BYTE
S SLAVE ID (7 BITS) RW A SUBADDRESS (8 BITS) A P
MSB
START
LSB=0
ACK
STOP
MASTER TRANSMIT, SLAVE RECEIVE (DUMMY WRITE CYCLE)
1ST BYTE
2ND BYTE
3RD BYTE
S SLAVE ID (7 BITS) RW A
DATA (8 BITS)
A
DATA (8 BITS)
1P
MSB
START
LSB=1
ACK
MASTER RECEIVE, SLAVE TRANSMIT (READ CYCLE)
STOP
NO ACK IN
LAST BYTE
SLAVE ID - 110CCC0X
CS2 (PIN 35)
CS1 (PIN 37)
CS0 (PIN 34)
X – RW BIT, 1: READ, 0:WRITE
S – START CONDITION
A – ACKNOWLEDGE BIT
P – STOP CONDITION
– SLAVE TRANSMIT
– MASTER TRANSMIT
– MASTER INITIATE
Figure 8. I²C Bus Protocol Format
14 May 1999
Version 1.11
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