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MAG3
Triaxial Magnetometer, Accelerometer & Gyroscope
Analog Inertial Sensor
Product Specification
Document Number: DSS-0804
Document Revision - M
Functional Description
The MAG3 is the world’s smallest commercially available analog inertial measurement unit, providing triaxial analog outputs of acceleration, rate of turn (gyroscope) and magnetic field data. The MAG3 is capable of sensing rotation, acceleration and magnetic field about three orthogonal axes. MAG3 provides all the sensors required for inertial measurement in a single SMT package measuring 0.70 × 0.70 × 0.40 inches.
Temperature outputs are also provided allowing the implementation of compensation techniques. A self-test feature can be used to actuate the gyro and accelerometer sensing structures and associated electronics. The MAG3 magnetic sensor reset feature can be used to periodically condition the magnetic sensor for optimum performance.
For pricing information contact MEMSense Sales at 888.668.8743, Ext. # 15, or via email at
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.
Applications
- Antenna Stabilization
- Automotive Control
- Inertial Measurement Units
- Orientation Sensing
- 3D Simulators
- Industrial Automation
Figure 1 - MAG3 Inertial Sensor
Features
- Triaxial Angular Rate Sensing
- Triaxial Accelerometer
- Triaxial Magnetometer
- Solid State MEMS Reliability
- Low Noise
- Low Power
- SMT Miniature Package
- 5 V Single Supply Operation
Table 1 - Ordering Information
|
Part Number
|
Accel
(g)
|
Rate
(o/s)
|
Mag
(gauss)
|
Bandwidth
(Hz.)
|
|
MAG02-0150S050
|
± 2
|
± 150
|
± 1.9
|
50
|
|
MAG02-0300S050
|
± 2
|
± 300
|
± 1.9
|
50
|
|
MAG05-0300S050
|
± 5
|
± 300
|
± 1.9
|
50
|
|
MAG05-0600S050
|
± 5
|
± 600
|
± 1.9
|
50
|
|
MAG10-0600S050
|
± 10
|
± 600
|
± 1.9
|
50
|
|
MAG10-1200S050
|
± 10
|
±1200
|
± 1.9
|
50
|
|
Contact Sales
|
Custom
|
Custom
|
Custom
|
|
Figure 2 - MAG3 Orientation Diagram
Table 2 - Specifications
|
Parameter
|
Specification
|
Units
|
Conditions
|
|
Sensor
|
|
|
|
|
Supply Voltage
|
4.75 to 5.25
|
V
|
|
|
Supply Current
|
30, (35)
|
mA
|
Typical, (Maximum)
|
|
Mass
|
5
|
Grams
|
Maximum
|
|
Commercial Temp. Range
|
0 to +70
|
°C
|
Temperature for max and min specs
|
|
Military Temp. Range
|
-40 to +85
|
°C
|
Request quote for 100% test
|
|
Accelerometers
|
MAG02
|
MAG05
|
MAG10
|
|
|
|
Range
|
± 2
|
± 5
|
± 10
|
g
|
|
|
Sensitivity
|
1000
|
400
|
200
|
mV/g
|
Note 3
|
|
Zero g output
|
2.50
|
2.50
|
2.50
|
V
|
|
|
Offset Vs Temp
|
±150
|
± 60
|
± 31
|
mV
|
0 to 70 °C
|
|
Noise X and Z
|
92,(300)
|
167,(300)
|
316, (505)
|
µg/Hz½
|
Typical, (Maximum)
|
|
Noise Y
|
110,(300)
|
191,(300)
|
343, (505)
|
µg/Hz½
|
Typical, (Maximum)
|
|
Bandwidth 1
|
50
|
50
|
50
|
Hz
|
Factory set 3dB point
|
|
Nonlinearity
|
± 0.4, (± 1.0)
|
± 0.4, (± 1.0)
|
± 0.4, (± 1.0)
|
% of FS
|
Typical, (Maximum)
|
|
Cross Axis Sensitivity
|
4
|
4
|
4
|
%
|
|
|
Rate Output
|
0150S050
|
0300S050
|
0600S050
|
1200S050
|
|
|
|
Dynamic Range
|
±150
|
± 300
|
±600
|
±1200
|
°/s
|
Full scale range over temperature
|
|
Sensitivity
|
12.5
|
5.0
|
2.5
|
1.25
|
mV/°/s
|
Note 3
|
|
Nonlinearity
|
0.1
|
0.1
|
0.1
|
0.1
|
% of FS
|
Best fit straight line
|
|
Zero Rate
|
2.50
|
2.50
|
2.50
|
2.50
|
V
|
|
|
Turn On Time
|
50
|
50
|
50
|
50
|
ms
|
Power on to ± ½ °/s of Final
|
|
Rate Noise Density
|
0.04
|
0.05
|
0.05
|
0.05
|
°/s/Hz½
|
Maximum
|
|
Bandwidth 1
|
50
|
50
|
50
|
50
|
Hz
|
Factory set 3dB point
|
|
Cross Axis Sensitivity
|
4
|
4
|
4
|
4
|
%
|
|
|
Rate Reference Output
|
|
|
|
|
Voltage Value
|
2.5
|
V
|
|
|
Temperature Drift
|
±5.0
|
mV
|
Deviation from 25°C
|
|
Temperature Output
|
|
|
|
|
Voltage at 25 °C
|
2.50
|
V
|
|
|
Scale Factor
|
9.0
|
mV/°C
|
Note 3
|
|
Magnetic Field
|
|
|
|
|
Dynamic Range
|
± 1.9
|
gauss
|
|
|
Sensitivity Drift
|
2700
|
ppm/°C
|
|
|
Sensitivity
|
1.0
|
V/gauss
|
Note 3
|
|
Zero Gauss Output
|
2.50
|
V
|
|
|
Nonlinearity
|
0.5
|
% of FS
|
Best fit straight line
|
|
Noise Density
|
0.14
|
mG/Hz½
|
Maximum
|
|
Bandwidth2
|
50
|
Hz
|
Magnetic signal
|
|
Cross Axis Sensitivity
|
8.5
|
%
|
|
|
Absolute Maximum Ratings
|
|
|
|
|
Acceleration Powered
|
2000 max
|
g
|
Any axis 0.5 ms
|
|
Vdd
|
-0.3, +6.0
|
V
|
Minimum, Maximum
|
|
Operating Temperature
|
-40 to +85
|
°C
|
|
|
Storage Temperature
|
-65 to +150
|
°C
|
|
|
Typical Values at 25 °C, Vdd = 5.0V, 0 °/s unless otherwise noted
|
- Other bandwidth configurations are available upon request.
- Addition of external 2.2uF capacitor to ground sets each magnetic signal’s bandwidth to 50Hz. F3db= 1/(2*p*1.5k*C)
- Ratiometric to Supply Voltage
Figure 3 - Functional Block Diagram
Table 3 - Pin Function Description
|
Pin No.
|
Name
|
Function
|
|
1
|
XREF
|
X axis analog precision reference output.
|
|
2
|
XRATE
|
X axis analog rate signal output.
|
|
3
|
ZREF
|
Z axis analog precision reference output.
|
|
4
|
ZRATE
|
Z axis analog rate signal output.
|
|
5
|
TEMPZ
|
Analog temperature voltage output, Z gyro.
|
|
6
|
AGND
|
Analog power supply return.
|
|
7
|
TEMPX
|
Analog temperature voltage output, X gyro.
|
|
8
|
TEMPY
|
Analog temperature voltage output, Y gyro.
|
|
9
|
XMAG
|
X axis analog magnetic signal output
|
|
10
|
YMAG
|
Y axis analog magnetic signal output
|
|
11
|
ZMAG
|
Z axis analog magnetic signal output
|
|
12-22
|
|
No connect (open)1
|
|
23
|
MGND
|
Magnetic sensor reset circuit ground
|
|
24
|
MAG RESET
|
Magnetic reset input
|
|
25
|
MGND
|
Magnetic sensor reset circuit ground
|
|
26
|
VDDM
|
Magnetic sensor reset power supply
|
|
27-35
|
|
No connect (open) 1
|
|
36
|
AGND
|
Analog power supply return.
|
|
37
|
VDDA
|
Analog power supply.
|
|
38
|
TESTN
|
High-level activated digital input stimulating X, Y and Z rate to Ref – 1.9 V. 2
|
|
39
|
TESTP
|
High-level activated digital input stimulating X, Y and Z rate to Ref +1.9 V. 2
|
|
40
|
YACCEL
|
Y axis analog acceleration signal output.
|
|
41
|
ZACCEL
|
Z axis analog acceleration signal output.
|
|
42
|
XACCEL
|
X axis analog acceleration signal output.
|
|
43
|
YREF
|
Y axis analog precision reference output.
|
|
44
|
YRATE
|
Y axis analog rate signal output.
|
|
|
- Physical solder connection recommended.
- The 150°/s rate sensor will produce a 1.9 V output change while the 300°/s rate sensor will produce a 417 mV output change.
- 3. Do Not Ground 2.5V Precision Reference Outputs, Damage to the Device May Occur (Recommend floating or the use of a 20k resistor or higher)
All dimensions in [mm] inches - Hand solder attachment recommended
Figure 4 – Physical Dimensions
Figure 5 – Recommended PCB Pattern
Magnetometer Reset Function
The accuracy of the MAG3’s triaxial magnetometer may be degraded after exposure to strong magnetic fields of 20 gauss or larger. Such fields may cause a decrease in the sensor’s sensitivity, linearity or a complete “stuck” output. For this reason, the MAG3 includes a set/reset circuit that regains magnetic sensing accuracy after exposure to strong magnetic fields. The magnetometer reset function should be performed as an initialization process for the MAG3.
The set or reset operations can be initiated via the magnetometer reset pin (pin 24), which is a 5 volt TTL input. The magnetometer reset function begins with the magnetometer reset pin held at 5V, through a pull up resistor, followed by a transition to 0V, which performs the reset. After a delay of greater than 1.2 ms, the magnetometer reset pin should be returned to its 5V state, which performs the set. A graphical depiction of the magnetometer reset waveform is shown in Figure 6 below.
Figure 5 –Pin 24 Magnetometer Reset Function Required Waveform
Document Change History
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Rev
|
Status
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Description
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Date
|
|
M
|
Obsolete
|
New MEMSense document format
|
12/16/2008
|
|
N
|
Released
|
Normalized overall formatting
|
12/03/2009
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