AK8817_09 Datasheet, PDF (18/50 Pages) Asahi Kasei Microsystems – NTSC/PAL Digital Video Encoder

ASAHI KASEI
[AK8817/18]
Device Control Interface
The AK8817/18 is controlled via I2C Bus Control Interface.
[ I2C SLAVE Address ]
2C Slave Address is 0x40
[ I2C Control Sequence ]
(1) Write Sequence
When the Slave Address of the AK8817/18 Write mode is received at the first byte, Sub Address at the second byte and
Data at the third and 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) 1 Byte Write Sequence
S
Slave
Address
w
A
Sub
Address
A
Data
A
Stp
8-bits
1bit 8-bits 1bit 8-bits 1bit
(b) Multiple Bytes ( m-bytes ) Write Sequence ( Sequential Write Operation )
S
Slave
Address
wA
Sub
Address
(n)
A
Data(n)
A
Data(n+
1)
A _…. Data(n+m) A
stp
8-bits
1bit 8-bits 1bit 8-bits 1bit 8-bits 1bit
8-bits 1bit
(2) Read Sequence
When the Slave Address of the AK8817/18 Read mode is received, Data at the second and succeeding bytes are
transmitted.
S
Slave
Address
wA
Sub
Address
(n)
A rS
Slave
Address
R A Data1
A Data2
A Data3
A … Data n Ā
stp
8-bits 1 8-bits 1
8-bits
1 8-bits 1 8-bits 1 8-bits 1
8-bits 1
Abbreviated terms listed above mean :
S, rS
A
A-
stp
R/W
: Start Condition
: Acknowledge ( SDA Low )
: Not Acknowledge ( SDA High )
: Stop Condition
1 : Read 0 : Write
: to be controlled by the Master Device. Micro-computer interface is output normally .
: to be controlled by the Slave Device. To be output by the AK8817/18.
Rev.001E
18
2009 / 12