[AK8975/C]

1.

Features ....................................................................................................................................1

2.

Overview ...................................................................................................................................2

3.

Table of Contents ......................................................................................................................3

4.

Circuit Configuration ..................................................................................................................5

4.1.

Block Diagram ....................................................................................................................5

4.2.

Block Function....................................................................................................................5

4.3.

Pin Function .......................................................................................................................6

5.

Overall Characteristics ..............................................................................................................7

5.1.

Absolute Maximum Ratings................................................................................................7

5.2.

Recommended Operating Conditions ................................................................................7

5.3.

Electrical Characteristics ....................................................................................................7

5.3.1.

DC Characteristics ......................................................................................................7

5.3.2.

AC Characteristics ......................................................................................................8

5.3.3.

Analog Circuit Characteristics .....................................................................................8

5.3.4.

4-wire SPI ...................................................................................................................9

5.3.5.

I

2C Bus Interface .......................................................................................................10

6.

Functional Explanation ............................................................................................................ 11

6.1.

Power States .................................................................................................................... 11

6.2.

Reset Functions ............................................................................................................... 11

6.3.

Operation Modes..............................................................................................................12

6.4.

Description of Each Operation Mode................................................................................13

6.4.1.

Power-down Mode ....................................................................................................13

6.4.2.

Single Measurement Mode .......................................................................................13

6.4.2.1.

Data Ready ........................................................................................................13

6.4.2.2.

Data Error ..........................................................................................................14

6.4.2.3.

Magnetic Sensor Overflow .................................................................................14

6.4.3.

Self-test Mode ...........................................................................................................15

6.4.4.

Fuse ROM Access Mode ..........................................................................................15

7.

Serial Interface ........................................................................................................................16

7.1.

4-wire SPI.........................................................................................................................16

7.1.1.

Writing Data ..............................................................................................................16

7.1.2.

Reading Data ............................................................................................................17

7.2.

I

2C Bus Interface ..............................................................................................................18

7.2.1.

Data Transfer ............................................................................................................18

7.2.1.1.

Change of Data..................................................................................................18

7.2.1.2.

Start/Stop Condition ...........................................................................................18

7.2.1.3.

Acknowledge......................................................................................................19

7.2.1.4.

Slave Address ....................................................................................................19

7.2.2.

WRITE Instruction .....................................................................................................20

7.2.3.

READ Instruction.......................................................................................................21

7.2.3.1.

One Byte READ .................................................................................................21

7.2.3.2.

Multiple Byte READ ...........................................................................................21

8.

Registers .................................................................................................................................22

8.1.

Description of Registers ...................................................................................................22

8.2.

Register Map ....................................................................................................................23

8.3.

Detailed Description of Registers .....................................................................................24

8.3.1.

WIA: Device ID..........................................................................................................24

8.3.2.

INFO: Information......................................................................................................24

8.3.3.

ST1: Status 1.............................................................................................................24

8.3.4.

HXL to HZH: Measurement Data...............................................................................25

8.3.5.

ST2: Status 2.............................................................................................................26

8.3.6.

CNTL: Control ...........................................................................................................26

8.3.7.

RSV: Reserved .........................................................................................................27

8.3.8.

ASTC: Self Test Control ............................................................................................27

8.3.9.

TS1, TS2: Test 1, 2 ...................................................................................................27

8.3.10.

I2CDIS: I

2C Disable...................................................................................................27

8.3.11.

ASAX, ASAY, ASAZ: Sensitivity Adjustment values...................................................28

MS1187-E-02

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2010/05