ASAHI KASEI
[AK8973]
=Preliminary=
AK8973
3-axis Electronic Compass
1. Features
3-axis electronic compass IC
Optimal built-in electronic compass for mobile phones and handy terminals
High sensitivity Hall sensors are integrated.
Functions
•
Built-in 8-bit ADC
•
Built-in amplifier for sensor signal amplification
•
Built-in 8-bit DAC for sensor signal offset compensation
•
Built-in EEPROM for storing individual adjustment values
•
Built-in temperature sensor
•
8-bit digital output
•
Serial interface: I2C bus interface (supporting the low-voltage specification)
•
Automatic power-down function
•
Interrupt function for measurement data ready
•
Built-in master clock oscillator
Operating temperatures:
-30°C to +85°C
Operating supply voltage: +2.5V to +3.6V
Low current consumption/measurement time:
•
Power-down:
0.2μA typ.
•
Magnetic sensor driving:
6.8mA/12.6ms
Package: 16-pin QFN package:
MS0561-E-01
4.0mm×4.0mm×0.7mm
-1-
2007/01
ASAHI KASEI
[AK8973]
3. Table of Contents
1.
2.
3.
4.
Features ....................................................................................................................................1
Overview ...................................................................................................................................2
Table of Contents ......................................................................................................................3
Circuit Configuration ..................................................................................................................5
4.1. Block Diagram....................................................................................................................5
4.2. Block Function....................................................................................................................6
4.3. Pin Function .......................................................................................................................7
5. Overall Characteristics ..............................................................................................................8
5.1. Absolute Maximum Ratings................................................................................................8
5.2. Recommended Operating Conditions ................................................................................8
5.3. Electrical Characteristics ....................................................................................................8
5.3.1. DC Characteristics ......................................................................................................8
5.3.2. EEPROM Characteristics............................................................................................9
5.3.3. Analog Circuit Characteristics .....................................................................................9
5.4. Detailed Timing...................................................................................................................9
5.4.1. Various Timing.............................................................................................................9
5.4.2. I2C Bus Interface .......................................................................................................10
6. Functional Explanation ............................................................................................................ 11
6.1. Operation Modes.............................................................................................................. 11
6.2. Description of Each Operation Mode................................................................................12
6.2.1. Power-down Mode ....................................................................................................12
6.2.2. Sensor Measurement Mode ......................................................................................12
6.2.3. EEPROM Mode.........................................................................................................13
6.3. Interrupt Function based on INT Pin.................................................................................13
7. Serial Interface ........................................................................................................................14
7.1. Data Transfer....................................................................................................................14
7.1.1. Change of Data .........................................................................................................14
7.1.2. Start/Stop Condition ..................................................................................................14
7.1.3. Acknowledge.............................................................................................................15
7.1.4. Slave Address ...........................................................................................................15
7.2. WRITE Instruction ............................................................................................................16
7.3. READ Instruction..............................................................................................................17
7.3.1. Current Address READ .............................................................................................17
7.3.2. Random READ..........................................................................................................17
8. Registers .................................................................................................................................18
8.1. Description of Registers ...................................................................................................18
8.2. Register Map....................................................................................................................19
8.3. Detailed Description of Registers .....................................................................................20
8.3.1. ST: Status Register....................................................................................................20
8.3.2. TMPS: Temperature Sensor Data Register ...............................................................20
8.3.3. H1X, H1Y, H1Z: Sensor Data Register......................................................................21
8.3.4. MS1: Mode Setting Register 1 ..................................................................................21
8.3.5. HXDA, HYDA, HZDA: Magnetic Sensor DAC Setting Register.................................22
8.3.6. HXGA, HYGA, HZGA: Magnetic Sensor Gain Setting Register ................................23
9. EEPROM.................................................................................................................................24
9.1. Outline of the Function .....................................................................................................24
9.2. Operation Description.......................................................................................................25
9.2.1. READ Instruction.......................................................................................................25
9.2.1.1.
Current Address READ ......................................................................................25
9.2.1.2.
Random READ ..................................................................................................25
9.2.2. WRITE Instruction .....................................................................................................26
9.2.2.1.
Byte-Write ..........................................................................................................26
9.3. Memory Map ....................................................................................................................27
10. Example of Recommended External Connection ....................................................................28
11. Package ..................................................................................................................................29
11.1. Marking ............................................................................................................................29
11.2. Pin Assignment ................................................................................................................29
MS0561-E-01
-3-
2007/01
