NVE’s AAT003-10E angle sensors use unique Tunnelling Magnetoresistance (TMR) elements for large signals and low power consumption. This sensor is a low-resistance version with a typical bridge resistance of 40KΩ, the lower device resistance reduces Johnson noise, and is also ideal for direct microcontroller interfaces because the lower output impedance can quickly charge microcontroller sample-and-hold input stages. The sensor provides sine and cosine signals defining the angle of rotation. Outputs are proportional to the supply voltage and peak-to-peak output voltages are much larger than conventional sensor technologies.

• Surface-mount tunnelling magnetoresistance (TMR) angle sensor technology
• Tunnelling Magnetoresistance (TMR) technology
• Supply voltage of +5.5V
• High output signal without amplification
• Immune to airgap variations
• Operates with as little as 30 Oersted field.
• Sine and cosine and outputs
• Temperature range −40°C to +125°C
• Ultraminiature TDFN6 packages

The AAT003-10E sensor contains four sensing resistors at 90° intervals. The resistors are connected as two half-bridges providing the sine and cosine voltage outputs. For each half bridge the resistance of one element increases and the other decreases as the field rotates, thus the bridge resistance, device resistance and output impedances remain constant with rotation

Typical applications for the ATT series include:

• Battery powered applications
• Knob position sensors, rotary encoders
• Automotive rotary position sensors
• Motor shaft position sensors

The below table gives the full specifications of the NVE AAT angle sensor series including the AAT003-10E:

1. Large magnetic fields CANNOT damage NVE sensors.

2. “Fixed Bias” means a fixed airgap between the bias magnet and sensor so the magnetic field at the sensor is constant.

3. “Variable Bias” means the magnetic field strength at the sensor can vary across the specification range.

4. Maximum deviation of either output from an ideal sine wave.