AS5043

Data Sheet – Alignment Mode

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Revision 1.80

19 – 36

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 15). 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 16).

Figure 16: Enabling the Alignment Mode

Figure 17: Exiting Alignment Mode

AlignMode enable

PROG

CSn

Read-out

via SSI

2µs

min.

2µs

min.

exit AlignMode

PROG

CSn

Read-out

via SSI