[AK09916]

015007392-E-02

2015/12

- 14 -

Self-test Mode

9.4.4.

Self-test mode is used to check if the magnetic sensor is working normally.

When Self-test mode (MODE[4:0] bits = “10000”) is set, magnetic field is generated by the internal

magnetic source and magnetic sensor is measured. Measurement data is stored to measurement data registers

(HXL to HZH), then AK09916 transits to Power-down mode automatically.

Data read sequence and functions of read-only registers in Self-test mode is the same as Single measurement

mode.

9.4.4.1. Self-test Sequence

(1) Set Power-down mode. (MODE[4:0] bits = “00000”)

(2) Set Self-test mode. (MODE[4:0] bits = “10000”)

(3) Check Data Ready or not by polling DRDY bit of ST1 register.

When Data Ready, proceed to the next step.

(4) Read measurement data. (HXL to HZH)

9.4.4.2. Self-test Judgment

When measurement data read by the above sequence is in the range of following table, AK09916 is working

normally.

HX[15:0] bits

HY[15:0] bits

HZ[15:0] bits

Criteria

-200

-200

-1000