AK8851 Datasheet, PDF (51/80 Pages) Asahi Kasei Microsystems – NTSC/PAL/SECAM Digital Video Decoder

ASAHI KASEI
32. Device Control Interface
The AK8851 operation is controlled via I2C bus control interface.
[I2C Bus SLAVE Address]
Either of 0x88 or 0x8A I2C Slave Address is selected by SELA pin.
SELA
PULL DOWN [LOW]
PULL UP [High]
SLAVE Address
0x88
0x8A
[AK8851]
[ I²C Control Sequence ]
(1) Write Sequence
After receiving a “write mode slave address” first byte, the AK8851 receives sub-address in the second byte and data in
the third and successive bytes.
In write sequences, there is a single-byte write sequence and a continuous write sequence ( sequential write operation ).
(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 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) A stp
8-bits
1-
bit
(2) Read Sequence
After receiving the “Slave address for read” first byte, the AK8851 sends data in the second and successive bytes.
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 . . .
1 8-bits 1
Data n Ā stp
8-bits 1
S, rS : Start Condition
A : Acknowledge (SDA Low )
Ā: Not Acknowledged (SDA High)
stp : Stop Condition
R/W 1 : Read 0 : Write
: Master device. Normally micro-processor
: Slave device: Slave device: AK8851
MS0244-E-03
51
Confidential
2005 / 07