AK8856 Datasheet, PDF (84/105 Pages) Asahi Kasei Microsystems – NTSC/PAL Digital Video Decoder

ASAHI KASEI
[ AK8856 ]
Device Control Interface
The AK8855 is controlled through an I²C Bus Control Interface.
[I²C SLAVE Address]
I²C Slave Address is 0x88
A6 A5 A4 A3
1
0
0
0
[I²C Control Sequence]
(1) Write Sequence
A2 A1
1
0
A0 R/W
0
When the Slave Address of the AK8856 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 two operations in the 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
1-
8-bits
bit
1-
8-bits
1-
bit
bit
(b) Multiple Bytes ( m-bytes ) Write Sequence ( Sequential Write Operation )
S
Slave
Address
w
A
Sub
Address(n)
A
Data(n)
A Data(n+1) A ^---
8-bits
1-
8-bits
1-
8-bits
1-
8-bits
1-
bit
bit
bit
bit
Data(n+m)
8-bits
A stp
1-
bit
(2) Read Sequence
When the Slave Address of the AK8855 Read mode is received, Data at the second and succeeding bytes are transmitted.
S
Slave
Address
w
A
Sub
Address(n)
A rS
Slave
Address
RA
Data1
A
Data1
A Data2 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
Note ) At Sequential Read Operation, the first byte Read-out Data is repeatedly output (this does not occur in a normal,
single byte Read operation).
Abbreviated terms listed in the tables :
S, rS
A
A-
stp
R/W
: Start Condition
: Acknowledge (SDA Low)
: Not Acknowledged (SDA High)
: Stop Condition
1 : Read 0 : Write
: Controlled by the Master Device; micro-computer interface is output.
: Controlled by the Slave Device; output by the AK8856.
Rev-01
84
2007/03