AK8826VN Datasheet, PDF (23/157 Pages) Asahi Kasei Microsystems – HD/SD Multi Format Video Encoder with 3ch DAC

6. Common Function Specification
[AK8826VN]
This section describes common function specifications among Composite Video Encoder, Component Video Encoder, High
Speed Video DAC function Block.
■ Device Control Interface
The AK8826 is controlled via I2C Bus Control Interface.
[ I2C Bus Slave Address ]
I2C Slave Address is selectable to be either 0x40 or 0x42 by SELA pin setting.
SELA -pin
Low
(PVSS1)
High (PVDD1)
SLAVE Address
0x40
0x42
A6
A5
A4
A3
0
1
0
0
A2
A1
A0 R/W
0
0 SELA
[ I2C Control Sequence ]
( 1 ) Write Sequence
When the Slave Address of the AK8826 Write mode is received at the first byte, Sub-Address at the second byte and Data at
the third & succeeding bytes are received.
There are 2 operations in Write sequence—
A sequence to write at every single byte, and a sequential write operation to write multiple bytes successively.
(a) Single byte Write sequence
S
Slave
Address
wA
Sub
Address
A
8-bits
1-
8-bits
1-
bit
bit
Data
8-bits
A Stp
1-
bit
(b) Multiple Byte ( m-bytes ) Write Sequence ( Sequential Write Operation )
S
Slave
Address
w
A
Sub
Address(n)
A
Data(n)
A Data(n+1) A _ŋŋŋ Data(n+m) A stp
8-bits
1
8-bits
1 8-bits
1
8-bits
1
8-bits
1
(2) Read Sequence
When the Slave Address of the AK8826 Read Mode is received at the first byte, data at the second and succeeding bytes are
transmitted from the AK8826.
S
Slave
Address
wA
Sub
Address(n)
A
rS
Slave
Address
R
A
Data1
A
8-bits
1 8-bits 1
8-bits
1 8-bits 1
Data2
8-bits
A Data3 A ŋŋŋ
1 8-bits 1
Data n Ā stp
8-bits 1
Abbreviated Terms listed above mean :
S, rS
A
Ā
Stp
R/W
: Start Condition
: Acknowledge ( SDA low )
: Not Acknowledged ( SDA high )
: Stop Condition
: 1 : Read, 0 : Write
: to be controlled by the Master Device. To be output by micro-computer normally.
: to be controlled by the Slave Device. To be output by the AK8826.
Note: At the MutipleByte Read/Write Sequence, read or write register operation cannot done at one-time.
Add[0x00] - Add[0x35] operation is done, then Add[0x36] - Add[0x3F] should be done.
To read or to write Test Register, 1 Byte Read/Write sequence should be done.
MS0972-E-01
23
2008/12