[AK8975/C]
3. Table of Contents
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.
5.3.2.
5.3.3.
5.3.4.
5.3.5.
DC Characteristics ......................................................................................................7
AC Characteristics ......................................................................................................8
Analog Circuit Characteristics.....................................................................................8
4-wire SPI ...................................................................................................................9
I2C 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.
6.4.2.
Power-down Mode ....................................................................................................13
Single Measurement Mode .......................................................................................13
6.4.2.1.
6.4.2.2.
6.4.2.3.
Data Ready........................................................................................................13
Data Error ..........................................................................................................14
Magnetic Sensor Overflow.................................................................................14
6.4.3.
6.4.4.
Self-test Mode...........................................................................................................15
Fuse ROM Access Mode ..........................................................................................15
7. Serial Interface ........................................................................................................................16
7.1. 4-wire SPI.........................................................................................................................16
7.1.1.
7.1.2.
Writing Data ..............................................................................................................16
Reading Data ............................................................................................................17
7.2. I2C Bus Interface ..............................................................................................................18
7.2.1.
7.2.1.1.
7.2.1.2.
Data Transfer ............................................................................................................18
Change of Data..................................................................................................18
Start/Stop Condition ...........................................................................................18
Acknowledge......................................................................................................19
Slave Address....................................................................................................19
7.2.1.3.
7.2.1.4.
7.2.2.
7.2.3.
WRITE Instruction.....................................................................................................20
READ Instruction.......................................................................................................21
7.2.3.1.
7.2.3.2.
One Byte READ.................................................................................................21
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.
8.3.2.
8.3.3.
8.3.4.
8.3.5.
8.3.6.
8.3.7.
8.3.8.
8.3.9.
WIA: Device ID..........................................................................................................24
INFO: Information......................................................................................................24
ST1: Status 1.............................................................................................................24
HXL to HZH: Measurement Data...............................................................................25
ST2: Status 2.............................................................................................................26
CNTL: Control ...........................................................................................................26
RSV: Reserved .........................................................................................................27
ASTC: Self Test Control ............................................................................................27
TS1, TS2: Test 1, 2 ...................................................................................................27
8.3.10. I2CDIS: I2C Disable...................................................................................................27
8.3.11. ASAX, ASAY, ASAZ: Sensitivity Adjustment values...................................................28
MS1187-E-02
- 3 -
2010/05
AKM [ ASAHI KASEI MICROSYSTEMS ]
