[AK09916]
9.4.4. Self-test Mode
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
-200 HX 200
HY[15:0] bits
-200 HY 200
HZ[15:0] bits
-1000 HZ -200
Criteria
≤
≤
≤
≤
≤
≤
015007392-E-02
2015/12
- 14 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
