AK8973

AK8973 Datasheet

[AK8973]

Part	Datasheet
AK8973	AK8973 (pdf)

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ASAHI KASEI [AK8973] =Preliminary= AK8973 3-axis Electronic Compass 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: 0.2uA typ. • Magnetic sensor driving: 6.8mA/12.6ms Package 16-pin QFN package: 4.0mmx4.0mmx0.7mm MS0561-E-01 <Preliminary> 2007/01 ASAHI KASEI [AK8973] Overview AK8973 is a geomagnetism detection type electronic compass IC. The small package of AK8973 integrates magnetic sensors for detecting geomagnetism in the X-axis, Y-axis, and Z-axis, and arithmetic circuit for processing the signal from each sensor. AK8973 outputs four data in total as 8-bit digital values respectively 3-axis magnetic sensor measured values and temperature sensor read value. By processing the magnetic sensor measured values with an external CPU, azimuth data can be obtained. By using AK8973 integrated into the system, a navigation system is achieved with reduced space in portable equipment such as PDA or mobile phone incorporating the GPS function. Specifically, AK8973 has the following features: 1 Due to the built-in 8-bit ADC and serial interface, geomagnetism of the X-axis, Y-axis, and Z-axis can be detected as digital data. 2 The serial interface corresponds to the I2C bus. 3 A dedicated power supply is used for the serial interface, so the low-voltage specification can also be supported by applying 1.85V. 4 Due to the built-in DAC for compensating the offset magnetic field, the position restraint with parts which generate the offset magnetic field such as speakers is reduced, and the degree of freedom about layout is expanded. Note 1 5 An EEPROM for storing the individual adjustment values of sensor sensitivity is built-in. The adjustment values are stored in factory at the time of shipment from AKM. 6 The built-in temperature sensor as an accessory generates the 8-bit digital A/D-converted value. The temperature information is not used for azimuth calculation. 7 The major circuit blocks of AK8973 are activated by the measurement request command from the controller, and transit to the power-down mode automatically at the end of measurement. That characteristic realizes the low power consumption required for mobile phones. 8 The interrupt function for posting the completion of sensor signal measurement to the external CPU is built-in. 9 The master clock oscillator is built-in. It is unnecessary to supply the clock from the outside. Note 1 For AK8973, the offset magnetic field compensation range is approximately ±2.0mT typical geomagnetism range is approximately 0.05mT . Depending on usage or required accuracy, use with the full-range is available. However, for the azimuth measurement by the mobile phones, it is important to regard the following in the design phase the magnetic field intensity of offset magnetic field source e.g. magnet of speaker is not fully controlled, and the temperature characteristic dispersion is noted. With AK8973, it is recommended that the design be performed with the parts layout where the offset magnetic field of each measurement axis is ±0.8mT or less. MS0561-E-01 <Preliminary> 2007/01 ASAHI KASEI [AK8973] Table of Contents Features Overview Table of Contents Circuit Configuration Block Pin Function Overall Characteristics Absolute Maximum Recommended Operating Conditions Electrical Characteristics DC Characteristics EEPROM Analog Circuit Characteristics Detailed Various I2C Bus Interface Functional Explanation 11 Operation 11 Description of Each Operation Power-down Mode Sensor Measurement Mode EEPROM Interrupt Function based on INT Serial Interface Data Change of Data Start/Stop Condition Slave Address WRITE Instruction READ Current Address READ Random Registers Description of Registers Register Detailed Description of Registers ST Status TMPS Temperature Sensor Data Register H1X, H1Y, H1Z Sensor Data MS1 Mode Setting Register 1 HXDA, HYDA, HZDA Magnetic Sensor DAC Setting HXGA, HYGA, HZGA Magnetic Sensor Gain Setting Register Outline of the Function Operation READ Current Address READ Random READ WRITE Instruction Byte-Write Memory Map Example of Recommended External Connection Package Marking Pin Assignment MS0561-E-01 <Preliminary> 2007/01 ASAHI KASEI

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ASAHI KASEI
[AK8973]
=Preliminary=

AK8973
3-axis Electronic Compass
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:
0.2uA typ.
• Magnetic sensor driving:
6.8mA/12.6ms

Package 16-pin QFN package:
4.0mmx4.0mmx0.7mm

MS0561-E-01 <Preliminary>
2007/01

ASAHI KASEI
[AK8973]

Overview

AK8973 is a geomagnetism detection type electronic compass IC. The small package of AK8973 integrates magnetic sensors for detecting geomagnetism in the X-axis, Y-axis, and Z-axis, and arithmetic circuit for processing the signal from each sensor. AK8973 outputs four data in total as 8-bit digital values respectively 3-axis magnetic sensor measured values and temperature sensor read value. By processing the magnetic sensor measured values with an external CPU, azimuth data can be obtained. By using AK8973 integrated into the system, a navigation system is achieved with reduced space in portable equipment such as PDA or mobile phone incorporating the GPS function. Specifically, AK8973 has the following features:
1 Due to the built-in 8-bit ADC and serial interface, geomagnetism of the X-axis, Y-axis, and Z-axis can be detected as digital data.
2 The serial interface corresponds to the I2C bus. 3 A dedicated power supply is used for the serial interface, so the low-voltage specification can also be
supported by applying 1.85V. 4 Due to the built-in DAC for compensating the offset magnetic field, the position restraint with parts
which generate the offset magnetic field such as speakers is reduced, and the degree of freedom about layout is expanded. Note 1 5 An EEPROM for storing the individual adjustment values of sensor sensitivity is built-in. The adjustment values are stored in factory at the time of shipment from AKM. 6 The built-in temperature sensor as an accessory generates the 8-bit digital A/D-converted value. The temperature information is not used for azimuth calculation. 7 The major circuit blocks of AK8973 are activated by the measurement request command from the controller, and transit to the power-down mode automatically at the end of measurement. That characteristic realizes the low power consumption required for mobile phones. 8 The interrupt function for posting the completion of sensor signal measurement to the external CPU is built-in. 9 The master clock oscillator is built-in. It is unnecessary to supply the clock from the outside.

Note 1 For AK8973, the offset magnetic field compensation range is approximately ±2.0mT typical geomagnetism range is approximately 0.05mT . Depending on usage or required accuracy, use with the full-range is available. However, for the azimuth measurement by the mobile phones, it is important to regard the following in the design phase the magnetic field intensity of offset magnetic field source e.g. magnet of speaker is not fully controlled, and the temperature characteristic dispersion is noted. With AK8973, it is recommended that the design be performed with the parts layout where the offset magnetic field of each measurement axis is ±0.8mT or less.

MS0561-E-01 <Preliminary>
2007/01

ASAHI KASEI
[AK8973]

Table of Contents

Features Overview Table of Contents Circuit Configuration

Block Pin Function Overall Characteristics Absolute Maximum Recommended Operating Conditions Electrical Characteristics

DC Characteristics EEPROM Analog Circuit Characteristics Detailed Various I2C Bus Interface Functional Explanation 11 Operation 11 Description of Each Operation Power-down Mode Sensor Measurement Mode EEPROM Interrupt Function based on INT Serial Interface Data Change of Data Start/Stop Condition Slave Address WRITE Instruction READ Current Address READ Random Registers Description of Registers Register Detailed Description of Registers ST Status TMPS Temperature Sensor Data Register H1X, H1Y, H1Z Sensor Data MS1 Mode Setting Register 1 HXDA, HYDA, HZDA Magnetic Sensor DAC Setting HXGA, HYGA, HZGA Magnetic Sensor Gain Setting Register Outline of the Function Operation READ

Current Address READ Random READ WRITE Instruction Byte-Write Memory Map Example of Recommended External Connection Package Marking Pin Assignment

MS0561-E-01 <Preliminary>
2007/01

ASAHI KASEI

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Datasheet ID: AK8973 515928