AK09918 Datasheet, PDF (9/30 Pages) Asahi Kasei Microsystems – 3-axis Electronic Compass

[AK09918]
9.3. Operation Modes
AK09918 has following seven operation modes:
(1) Power-down mode
(2) Single measurement mode
(3) Continuous measurement mode 1
(4) Continuous measurement mode 2
(5) Continuous measurement mode 3
(6) Continuous measurement mode 4
(7) Self-test mode
By setting CNTL2 register MODE[4:0] bits, the operation set for each mode is started.
A transition from one mode to another is shown below.
Power-down
mode
MODE[4:0] = “00001”
MODE[4:0] = “00000”
Transits automatically
MODE[4:0] = “00010”
MODE[4:0] = “00000”
MODE[4:0] = “00100”
MODE[4:0] = “00000”
MODE[4:0] = “00110”
MODE[4:0] = “00000”
MODE[4:0] = “01000”
MODE[4:0] = “00000”
Single measurement mode
Sensor is measured for one time and data is output.
Transits to Power-down mode automatically after
measurement ended.
Continuous measurement mode 1
Sensor is measured periodically in 10Hz.
Transits to Power-down mode by writing
MODE[4:0] = “00000”.
Continuous measurement mode 2
Sensor is measured periodically in 20Hz.
Transits to Power-down mode by writing
MODE[4:0] =“00000”.
Continuous measurement mode 3
Sensor is measured periodically in 50Hz.
Transits to Power-down mode by writing
MODE[4:0] = “00000”.
Continuous measurement mode 4
Sensor is measured periodically in 100Hz.
Transits to Power-down mode by writing
MODE[4:0] = “00000”.
MODE[4:0] = “10000”
MODE[4:0] = “00000”
Transits automatically
Self-test mode
Sensor is self-tested and the result is output.
Transits to Power-down mode automatically.
Figure 9.1. Operation mode
When power is turned ON, AK09918 is in Power-down mode. When a specified value is set to MODE[4:0]
bits, AK09918 transits to the specified mode and starts operation. When user wants to change operation
mode, transit to Power-down mode first and then transit to other modes. After Power-down mode is set, at
least 100 s (Twait) is needed before setting another mode
016014242-E-00
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2016/11