AK8140A Datasheet, PDF (17/45 Pages) Asahi Kasei Microsystems – Programmable Clock Generator

AK8140A
Serial interface
Read/Write performance of serial interface is explained as below. The device address of
AK8140A is Device Address#1:1100, Device Address#2:1 A1 0.
A1 is set by the register bit “” (Address:03h).
1100
Device Adress#1
1
A1
0
R:1
W:0
Device Adress#2
Write operation
Write operation is described below. Data must be sent after sending 8 bits address and receiving ACK.
It is possible to write next address sequentially by sending next data instead of stop condition.
The address which is written after “13h/15h/2Bh” becomes “14h/20h/30h”.
Write operation
SDA
S
T
A _Slave
R _Address
T
Register
Address(n)
Data(n)
Data(n+1)
S
A1 W A
A
A
A
C
C
C
C
K
K
K
K
S
T
Data(n+x) _O
P
P
Current address read
Current address read operation is described below. The data that is read by this operation is obtained
as “last accessed address + 1”. Therefore, it is consequent to return “1111 1110” after accessing the
address “1111 1111”.
SDA
Current address read
S
T
A ^Slave
R ^Address
T
Data(n)
Data(n+1)
Data(n+2)
S
A1 R A
A
A
A
C
C
C
C
K
K
K
K
S
Data(n+x) ^T
O
P
P
draft-E-06
- 17 -
Sep -12