AK8975 데이터 시트보기 (PDF) - Asahi Kasei Microdevices

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AK8975

3-axis Electronic Compass

Asahi Kasei Microdevices 

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.

[AK8975/C]

Power-down

m od e

MOD E[3:0]=“0001”

Transits automatically

MOD E[3:0]=“0000”

Single m easurement mode

Sensor is measured for one time and data is output.

Transits to Power-down m ode automatically after

measurement ended.

MOD E[3:0]=“1000”

Transits automatically

MOD E[3:0]=“0000”

Self-test m ode

Sensor is self-tested and the result is output. Transits

to Power-down m ode automatically.

M O DE [3 :0]=“11 11 ”

M O DE [3 :0]=“00 00 ”

Fuse R OM access m ode

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

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