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PDF AK8973 Data sheet ( Hoja de datos )
| Número de pieza | AK8973 | |
| Descripción | 3-axis Electronic Compass | |
| Fabricantes | Asahi Kasei Microsystems | |
| Logotipo |  |
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ASAHI KASEI
www.DataSheet4U.com
[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:
4.0mm×4.0mm×0.7mm
MS0561-E-01 <Preliminary>
-1-
2007/01
1 page  
ASAHI KASEI
www.DataSheet4U.com
4.1. Block Diagram
4. Circuit Configuration
[AK8973]
HE-X
HE-Y
HE-Z
MUX
Chopper
SW
Pre-AMP
Integrator
S&H
HE-Drive
DAC
T-sensor
OSC
Voltage
Reference
Timing
Logic
ADC
Interface
Logic
&Register
EEPROM
SCL
SDA
CAD1
CAD0
RSTN
INT
TST1 TST2 TST3
VSS VID VDD
MS0561-E-01 <Preliminary>
-5-
2007/01
5 Page 
ASAHI KASEI
www.DataSheet4U.com
6. Functional Explanation
6.1. Operation Modes
AK8973 has following three operation modes:
(1) Power-down mode
(2) Sensor measurement mode
(3) EEPROM access mode
By setting MS1 register MODE[1:0] bits, the operation set for each mode is started.
A transition from one mode to another is shown below.
1) Power input VDD
2) Resetting with RSTN pin
(1) Power-down
mode
MODE[1:0]=00
MODE[1:0]=11
(2) Sensor measurement mode
(normal operation)
Set measurement
condition.
On measurement
completion, transitons to
the power-down mode
automatically.
MODE[1:0]=10
MODE[1:0]=11
(3) EEPROM access mode
[AK8973]
After turning on the power, perform a reset operation by applying "L" to RSTN pin. Then AK8973 is set to
power-down mode.
A transition to mode (2) or (3) can be made only from power-down mode. A transition to a mode (2) or (3)
must be made through the power-down mode. To make the mode transition, write the setting data into the
MODE[1:0] shown in the transition diagram. After power-down mode is set, at least 100μs(Twat) is needed
before setting another mode.
Be sure to write a measurement condition for sensor measurement mode during the power-down mode.
Write-only registers MS1 and read-only registers can be accessed in any of the modes above.
MS0561-E-01 <Preliminary>
- 11 -
2007/01
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AK8973.PDF ] | |
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