ak8825 AKM Semiconductor, Inc., ak8825 Datasheet - Page 27

• Manufacturer Part Number: ak8825
• Description: Hd/sd Multi Format Video Encoder With 3ch Dac
• Manufacturer: AKM Semiconductor, Inc.

6. Common Function Specification
Speed Video DAC function Block.
■ Device Control Interface
The AK8825 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.
( 1 ) Write Sequence
When the Slave Address of the AK8825 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
When the Slave Address of the AK8825 Read Mode is received at the first byte, data at the second and succeeding bytes are
transmitted from the AK8825.
Abbreviated Terms listed above mean :
S, rS
A
Ā
Stp
R / W
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.
Rev-E-00
This section describes common function specifications among Composite Video Encoder, Component Video Encoder, High
[ I2C Control Sequence ]
(b) Multiple Byte ( m-bytes ) Write Sequence ( Sequential Write Operation )
(2) Read Sequence
S
S
S
A6
0
High
Low
Address
Slave
Address
Address
SELA -pin
8-bits
: Start Condition
: Acknowledge ( SDA low )
: Not Acknowledged ( SDA high )
: Stop Condition
: 1 : Read, 0 : Write
Slave
Slave
8-bits
8-bits
A5
1
(PVSS1)
(PVDD1)
w
A
1
: 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 AK8825.
w
w
A4
0
Address
bit
1-
A
8-bits
A
1
Sub
A3
0
(n)
Address
Address(n)
SLAVE Address
8-bits
Sub
8-bits
Sub
A
1
0x40
0x42
rS
A2
0
1-
bit
A
Address
A
1
Slave
8-bits
A1
Data(n)
0
8-bits
8-bits
Data
R
SELA
A
1
A0
27
Data1
bit
8-bits
1-
A
A
1
R/W
Data(n+1)
Stp
8-bits
A
1
Data2
8-bits
A
1
A
1
･･･
Data3
8-bits
Data(n+m)
8-bits
A
1
･･･
Data n
8-bits
A
1
stp
Ā
1
2008/03
[AK8825]
stp