|Full-Bridge TMR Angle Sensor
new AAT101-10E Full-Bridge TMR Angle Sensor is a high-output magnetic sensor for
angle measurements based on rotating magnetic fields.
The new sensor has two full-bridge push-pull outputs for double the signal. The
full-bridge configuration allows direct replacement of Hall effect sensors for
larger outputs and lower power.
The sensors provide sine and cosine signals defining the angle of rotation. Outputs
are proportional to the supply voltage, and peak-to-peak amplitudes are much larger
than conventional sensors.
Key AAT101 features include:
Full-bridge differential outputs
400 mV/V peak-to-peak output sensitivity
625 kΩ device resistance for low power and battery
Sine and cosine outputs for direction detection
1.5% max. nonsinusoidality error
Ultraminiature 2.5 mm x 2.5 mm x 0.8 mm
Because they are resistive devices with no active components, AAT-Series sensors
have no minimum supply voltage and can be powered from single-cell batteries.
There are now five members of the groundbreaking AAT Angle Sensor family:
(ea. output; p-p)
| Typ. Device
| Half bridge
All five part types are in stock and available for immediate delivery.
Evaluation Kit includes a circuit board with an AAT101 angle sensor,
a cylindrical horseshoe magnet, and easy connections.
This video uses the evaluation kit to demonstrate the remarkable AAT101 signal
Simple Full-Bridge Sensor Amplifier
AAT101 Angle Sensors have high output signals without amplification, but if single-ended
signals higher amplitude are needed, instrumentation amplifiers can minimize parts
The gain can be limited to about two to avoid saturating the amplifiers:
AAT101 with 2x instrumentation
Position Sensing with an AAT Sensor
Tunneling Magnetoresistance (TMR) sensors are normally used as angle sensors,
but they can be used in a configuration like this for linear displacement:
Displacement corresponds to
the angle from the sensor to the magnet, and is proportional to the ratio of the
two sensor outputs. In this example, a microcontroller does the simple ratio calculation.
A low-impedance AAT003 sensor is used for microcontroller compatibility.
An AAT003 configured as a linear position sensor.
A YouTube Video
shows a live demonstration and the sensors remarkable linearity, and includes
a sample microcontroller program.
Micron-scale resolution over a linear range of more than 0.25 inches is practical
with small, inexpensive magnets. Larger or stronger magnets can be used for a
wider linear range, and if exact linearity isnt needed, just one sensor
output is needed with no math.
This linear position configuration is ideal for electronically-adjustable magnetic
AAT sensors have a important advantages for linear position sensing:
|Repeatable, with very low
|Because the measurement
is based on an angle, the output doesnt depend on magnet strength.
output is zero when the magnet is centered.
|Wide linear sensing range.
sensors are in stock for immediate delivery.