[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 2400μT.

|X|+|Y|+|Z| < 2400μT

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