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AS5043TR Datasheet(PDF) 15 Page - ams AG |
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AS5043TR Datasheet(HTML) 15 Page - ams AG |
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15 / 26 page  AS5043 Programmable 360° Magnetic Angle Encoder Revision 1.4, 04-Apr-06 www.austriamicrosystems.com Page 15 of 26 14 Alignment Mode The alignment mode simplifies centering the magnet over the chip to gain maximum accuracy and XY-alignment tolerance. This electrical centering method allows a wider XY- alignment tolerance (0.485mm radius) than mechanical centering (0.25mm radius) as it eliminates the placement tolerance of the die within the IC package (+/- 0.235mm). Alignment mode can be enabled with the falling edge of CSn while PROG = logic high (Figure 16). The Data bits D9-D0 of the SSI change to a 10-bit displacement amplitude output. A high value indicates large X or Y displacement, but also higher absolute magnetic field strength. The magnet is properly aligned, when the difference between highest and lowest value over one full turn is at a minimum. Under normal conditions, a properly aligned magnet will result in a reading of less than 32 over a full turn. Stronger magnets or short gaps between magnet and IC may show values larger than 32. These magnets are still properly aligned as long as the difference between highest and lowest value over one full turn is at a minimum. The MagInc and MagDec indicators will be = 1 when the alignment mode reading is < 32. At the same time, hardware pin MagRngn (#1) will be pulled to VSS. The Alignment mode can be reset to normal operation mode by a power-on-reset (cycle power supply) or by a falling edge of CSn with PROG=low (see Figure 17). AlignMode enable PROG CSn Read-out via SSI 2µs min. 2µs min. Figure 16: Enabling the alignment mode exit AlignMode PROG CSn Read-out via SSI Figure 17:Exiting alignment mode 15 Choosing the proper Magnet Typically the magnet should be 6mm in diameter and 3mm in height. Magnetic materials such as rare earth AlNiCo, SmCo5 or NdFeB are recommended. The magnet’s field strength perpendicular to the die surface should be verified using a gauss-meter. The magnetic field Bv at a given distance, along a concentric circle with a radius of 1.1mm (R1), should be in the range of ±45mT…±75mT. (see Figure 18). 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 18: Typical magnet and magnetic field distribution |
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