AK8973 Datasheet, PDF (13/31 Pages) Asahi Kasei Microsystems – 3-axis Electronic Compass

ASAHI KASEI
[AK8973]
6.2.3. EEPROM Mode
This mode is used to access the EEPROM.
In ordinary use, read operation is needed, but write operation must not be performed.
To the EEPROM, the correction values of sensors are written before shipment from AKM. If these correction
values are lost, AK8973 cannot perform operations and measurements normally.
For details, refer to "9. EEPROM".
6.3. Interrupt Function based on INT Pin
AK8973 has an interrupt function for notifying the external CPU of completion of sensor signal measurement
by transition of INT pin from "L" to "H".
INT pin returns to "L" when any of the registers storing temperature or magnetic sensor output result is read.
On the falling edge of INT pin, INT bit also returns to "0".
In case of current address read, whether any of the registers mentioned above is read is checked. If any of them
is read, INT pin returns to "L" at the timing shown below.
SDA
INT
S
T
A
R/W="1"
R
T
S
Slave
Address
Data(n)
A
C
K
Data(n+1)
Data(n+2)
A
A
A
C
C
C
K
K
K
S
T
O
P
Data(n+x)
P
A
A
C
C
K
K
In case of random read, if the specified address is any of the registers mentioned above, INT pin returns to "L"
at the timing shown below.
SDA
INT
S
T
A
R/W="0"
R
T
S
T
A
R/W="1"
R
T
S
Slave
Address
Register
Address(n)
S
Slave
Address
A
A
C
C
K
K
Data(n)
A
C
K
Data(n+1)
A
A
C
C
K
K
S
T
O
P
Data(n+x)
P
A
A
C
C
K
K
MS0561-E-01 <Preliminary>
- 13 -
2007/01