AS5045-ASST datasheet(27/47 Pages) AMSCO

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[v2-01] 2017-Jul-13

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AS5045 − Detailed Description

Alignment Mode

The alignment mode simplifies centering the magnet over the

center of the chip to gain maximum accuracy.

Alignment mode can be enabled with the falling edge of CSn

while Prog = logic high (see Figure 27). The Data bits

D11-D0 of the SSI change to a 12-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 128 over a full turn.

The MagINCn and MagDECn indicators will be = 1 when the

alignment mode reading is < 128. At the same time, both

hardware pins MagINCn (#1) and MagDECn (#2) will be pulled

to VSS. A properly aligned magnet will therefore produce a

MagINCn = MagDECn = 1 signal throughout a full 360° turn of

the magnet.

Stronger magnets or short gaps between magnet and IC may

show values larger than 128. 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 alignment mode can be reset to normal operation by a

power-on-reset (disconnect / re-connect power supply) or by a

falling edge on CSn with Prog = low.

Figure 27:

Enabling the Alignment Mode

Figure 28:

Exiting the Alignment Mode

PROG

CSn

AlignMode enable

Read-out

via SSI

2µs

min.

2µs

min.

PROG

CSn

exit AlignMode

Read-out

via SSI

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