AS5040-ASST View Datasheet(PDF) - austriamicrosystems AG
Part Name
Description
MFG CO.
'AS5040-ASST' PDF : 61 Pages View PDF
AS5040 − Alignment Mode
Alignment Mode
Figure 38:
Enabling the 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 38). 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.The MagINCn and
MagDECn indicators will be = 1 when the alignment mode
reading is < 32. 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 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 alignment mode can be reset to normal operation mode by
a power-on-reset (disconnect / re-connect power supply).
Prog
CSn
AlignMode enable
Read-out
via SSI
2μs 2μs
min. min.
ams Datasheet
[v2-12] 2017-Jun-20
Page 37
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