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AS5035 Datasheet(PDF) 8 Page - ams AG |
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AS5035 Datasheet(HTML) 8 Page - ams AG |
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8 / 18 page  AS5035 – 64 PPR INCREMENTAL MAGNETIC ROTARY ENCODER Revision 1.5 www.austriamicrosystems.com Page 7 of 17 8 Simulation Modelling Figure 9: Arrangement of Hall sensor array on chip (principle) With reference to Figure 9, a diametrically magnetized permanent magnet is placed above or below the surface of the AS5035. The chip uses an array of Hall sensors to sample the vertical vector of a magnetic field distributed across the device package surface. The area of magnetic sensitivity is a circular locus of 1.1mm radius with respect to the center of the die. The Hall sensors in the area of magnetic sensitivity are grouped and configured such that orthogonally related components of the magnetic fields are sampled differentially. The differential signal Y1-Y2 will give a sine vector of the magnetic field. The differential signal X1-X2 will give an orthogonally related cosine vector of the magnetic field. The angular displacement ( Θ) of the magnetic source with reference to the Hall sensor array may then be modelled by: () () ° ± − − = Θ 5 . 0 2 1 2 1 arctan X X Y Y The ±0.5° angular error assumes a magnet optimally aligned over the center of the die and is a result of gain mismatch errors of the AS5035. Placement tolerances of the die within the package are ±0.235mm in X and Y direction, using a reference point of the edge of pin #1 (Figure 11) In order to neglect the influence of external disturbing magnetic fields, a robust differential sampling and ratiometric calculation algorithm has been implemented. The differential sampling of the sine and cosine vectors removes any common mode error due to DC components introduced by the magnetic source itself or external disturbing magnetic fields. A ratiometric division of the sine and cosine vectors removes the need for an accurate absolute magnitude of the magnetic field and thus accurate Z-axis alignment of the magnetic source. The recommended differential input range of the magnetic field strength (B(X1-X2),B(Y1-Y2)) is ±75mT at the surface of the die. In addition to this range, an additional offset of ±5mT, caused by unwanted external stray fields is allowed. The chip will continue to operate, but with degraded output linearity, if the signal field strength is outside the recommended range. Too strong magnetic fields will introduce errors due to saturation effects in the internal preamplifiers. Too weak magnetic fields will introduce errors due to noise becoming more dominant. 9 Choosing the Proper Magnet Typically the magnet should be 6mm in diameter and ≥2.5mm in height. Magnetic materials such as rare earth AlNiCo, SmCo5 or NdFeB are recommended. Magnet axis Vertical field component (45…75mT) 0 360 360 Bv Vertical field component R1 concentric circle; radius 1.1mm R1 Magnet axis typ. 6mm diameter S N Figure 10: Typical magnet and magnetic field distribution AS5040 die 1 Radius of circular Hall sensor array: 1.1mm radius Center of die 2.433 mm ±0.235mm 3.9 mm ±0.235mm X1 Y1 X2 Y2 |
Similar Part No. - AS5035_08 |
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Similar Description - AS5035_08 |
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