AK09912 Datasheet, PDF (3/42 Pages) HuaXinAn Electronics CO.,LTD – 3-axis Electronic Compass

3. Table of Contents
[AK09912]
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................................................................................9
5.3.4. 4-wire SPI.............................................................................................................10
5.3.5. I²C Bus Interface ..................................................................................................11
6. Function Explanation.........................................................................................................14
6.1. Power States...............................................................................................................14
6.2. Reset Functions..........................................................................................................14
6.3. Operation Mode ..........................................................................................................15
6.4. Description of Each Operation Mode .........................................................................16
6.4.1. Power-down Mode ...............................................................................................16
6.4.2. Single Measurement Mode ..................................................................................16
6.4.3. Continuous Measurement Mode 1, 2, 3 and 4 ....................................................17
6.4.4. External Trigger Measurement Mode ..................................................................20
6.4.5. Self-test Mode ......................................................................................................20
6.4.6. Fuse ROM Access Mode .....................................................................................20
6.5. Temperature Sensor ...................................................................................................21
6.6. Noise Suppression Filter (NSF)..................................................................................21
7. Serial Interface ..................................................................................................................22
7.1. 4-wire SPI ...................................................................................................................22
7.1.1. Writing Data..........................................................................................................22
7.1.2. Reading Data .......................................................................................................23
7.2. I²C Bus Interface.........................................................................................................24
7.2.1. Data Transfer .......................................................................................................24
7.2.2. WRITE Instruction................................................................................................26
7.2.3. READ Instruction..................................................................................................27
7.3. High-speed Mode (Hs-mode) .....................................................................................28
8. Registers ...........................................................................................................................29
8.1. Description of Registers .............................................................................................29
8.2. Register Map ..............................................................................................................30
8.3. Detailed of Description of Register.............................................................................31
8.3.1. WIA: Who I Am.....................................................................................................31
8.3.2. RSV: Reserved ....................................................................................................31
8.3.3. ST1: Status 1........................................................................................................31
8.3.4. HXL to HZH: Measurement Data .........................................................................32
8.3.5. TMPS: Temperature Data ....................................................................................33
8.3.6. ST2: Status 2........................................................................................................33
8.3.7. CNTL1: Control 1 .................................................................................................34
8.3.8. CNTL2: Control 2 .................................................................................................34
8.3.9. CNTL3: Control 3 .................................................................................................35
8.3.10. TS1, TS2, TS3: Test...........................................................................................35
8.3.11. I2CDIS: I²C Disable............................................................................................36
8.3.12. TS4: Test 4 .........................................................................................................36
8.3.13. ASAX, ASAY, ASAZ: Sensitivity Adjustment Values ..........................................36
9. Example of Recommended External Connection .............................................................37
MS1547-E-02
-3-
2014/7