AG911-07E NVE, AG911-07E Datasheet - Page 113
AG911-07E
Manufacturer Part Number
AG911-07E
Description
KIT EVALUATION GMR SWITCH
Manufacturer
NVE
Specifications of AG911-07E
Sensor Type
Magnetic. GMR (Giant Magnetoresistive)
Interface
Analog
Embedded
No
Utilized Ic / Part
AD Series Switches
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Voltage - Supply
-
Sensitivity
-
Sensing Range
-
Other names
391-1062
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GT Sensor Operation with Magnetic Encoders
Magnetic encoders generate their own magnetic field, so they are much easier to work with than gear
tooth wheels, as no bias magnet is required for the sensor. Also, magnetic encoders have alternating
north and south magnetic poles on their faces. Therefore the magnetic field is generated by the moving
body, and sensor offset problems are greatly reduced. The following drawing shows a GT Sensor
response to a magnetic encoder:
Note that in this case, as long as the sensor is positioned symmetrically with the encoder, offset is
minimized. Also note that the GT Sensor provides one full sine wave output for each magnetic pole.
This is double the frequency of a Hall effect sensor, which provides one full sine wave output for each
north-south pole pair. As a result, replacing a Hall sensor with a GT sensor doubles the resolution of
the output signal.
S
S
GMR Sensor
Resistors R3, R4
GMR Sensor
Resistors R3, R4
GMR Sensor
Resistors R3, R4
GMR Sensor
Resistors R3, R4
S
www.nve.com
S
N
N
N
Direction of Sensitivity
N
phone: 952-829-9217 fax: 952-829-9189
S
S
- 113 -
S
S
GMR Sensor
Resistors R1, R2
GMR Sensor
Resistors R1, R2
GMR Sensor
Resistors R1, R2
GMR Sensor
Resistors R1, R2
N
N
N
N
Application Notes
Voltage Output of
GMR Bridge
Voltage Output of
GMR Bridge
Voltage Output of
GMR Bridge
Voltage Output of
GMR Bridge
Rotation
Rotation
Rotation
Rotation
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