AK8963 데이터 시트보기 (PDF) - Asahi Kasei Microdevices

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AK8963

3-axis Electronic Compass

Asahi Kasei Microdevices 

[AK8963]

6.4.3.6. Magnetic Sensor Overflow

AK8963 has the limitation for measurement range that the sum of absolute values of each axis should be

smaller than 4912μT.

|X|+|Y|+|Z| < 4912μT

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”.

6.4.4. External Trigger Measurement Mode

When external trigger measurement mode (MODE[3:0]=“0100”) is set, AK8963 waits for trigger input. When

a pulse is input from TRG pin, sensor measurement is started on the rising edge of TRG pin. When sensor

measurement and signal processing is finished, measurement data is stored to measurement data registers

(HXL to HZH) and all circuits except for the minimum circuit required for trigger input waiting are turned off

(PD state). When the next pulse is input, AK8963 wakes up automatically from PD and starts measurement

again.

External trigger measurement mode ends when power-down mode (MODE[3:0]=“0000”) is set. AK8963

keeps waiting for the trigger input until the power-down mode is set.

When external trigger measurement mode (MODE[3:0]=“0100”) is set again while AK8963 is already in

external trigger measurement mode, it starts to wait for the trigger input again. The trigger input is ignored

while sensor is measuring.

Data read sequence and functions of read-only registers in external trigger measurement mode is the same as

continuous measurement mode.

MS1356-E-02

- 18 -

2013/10

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