[AK8975/C]
6.3. Operation Modes
AK8975/C has following four operation modes:
(1) Power-down mode
(2) Single measurement mode
(3) Self-test mode
(4) Fuse ROM access mode
By setting CNTL register MODE[3:0] bits, the operation set for each mode is started.
A transition from one mode to another is shown below.
Power-down
Single measurement mode
Sensor is measured for one time and data is output.
MODE[3:0]=“0001”
mode
Transits to Power-down mode automatically after
measurement ended.
Transits automatically
MODE[3:0]=“0000”
MODE[3:0]=“1000”
Transits automatically
MODE[3:0]=“0000”
Self-test mode
Sensor is self-tested and the result is output. Transits
to Power-down mode automatically.
Fuse ROM access mode
MODE[3:0]=“1111”
MODE[3:0]=“0000”
Turn on the circuit needed to read out Fuse ROM.
Transits to Power-down mode by writing
MODE[3:0]=“0000”.
Figure 6.1 Operation modes
When power is turned ON, AK8975/C is in power-down mode. When MODE[3:0] is set, AK8975/C 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 100μs(Twat) is needed
before setting another mode.
MS1187-E-02
- 12 -
2010/05
AKM [ ASAHI KASEI MICROSYSTEMS ]
