[AK8975/C]
6.4.2.2. Data Error
When data reading is started out of data readable period, read data is not correct. In this case, DERR bit of ST2
register turns to “1” so that read data can be checked at the end of data reading. DERR turns to “0” when ST2
register is read.
(N-1)th
Nth
(N+1)th
PD
Measurement
PD
Measurement
PD
Data Readable Period
Data Readable Period
Measurement Data Register
(N-1)th
Indefinite
Nth
Indefinite
(N+1)th
Ind
DRDY
DERR
Register Read
ST1
Data
ST2
ST1
Data
ST2
ST1
Data
ST2
Register
Register
Register
Figure 6.4 Data Error
6.4.2.3. Magnetic Sensor Overflow
AK8975/C has the limitation for measurement range that the sum of absolute values of each axis should be
smaller than 2400
μ
T.
|X|+|Y|+|Z| < 2400
μ
T
When the magnetic field exceeded this limitation, data stored at measurement data are not correct. This is
called Magnetic Sensor Overflow.
When magnetic sensor overlow occurs, HOFL bit turns to “1”. When the next measurement starts, it returns to
“0”.
MS1187-E-02
- 14 -
2010/05
