A31316 datasheet(22/61 Pages) ALLEGRO

22 / 61 page

3D Magnetic Position Sensor IC

A31316

Allegro MicroSystems

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

FIXED SEGMENT LINEARIZATION (LIN_MODE 0)

Y_val_01 ( value < 0 )

Y_val_03 ( value < 0 )

Y_val_13 ( value > 0 )

Figure 12: Fixed-Segment Linearization

In fixed-segment linearization mode, between 2 and 33 output

correction points are equidistantly positioned between 0° and

360° input. The correction codes Y_val_xx are in signed 13-bit

format and represent a correction using the format in the table

below:

Table 6: Y_val_xx range depending on lin_coeff_scalar set-

ting

lin_coeff_

scalar

Range (°)

Value for

code –4096 (°)

Value for code

+4095 (°)

Step size (°)

±45

+45

–44.99

90/213 ≈ 0.011

±90

+90

–89.98

180/213 ≈ 0.022

±180

+180

–179.96

360/213 ≈ 0.044

±360

+360

–359.91

720/213 ≈ 0.088

Most applications will have monotonically rising outputs. How-

ever, the sensor can support rising and falling outputs if needed.

If the result of the linearization is outside the 0–360° range, the

value will be clipped to 0° or 360°. No overflow will happen in

the linearization block. This means that for rotary applications,

the 0° correction value and the 360° correction value must both

be set to 0

FIXED SEGMENT BINNING (LIN_MODE 1)

Y_val_01

Y_val_11

Fixed segment binning (lin_mode 1)

Figure 13: Fixed-Segment Binning

In fixed-segment binning mode, between 2 and 33 bins are equi-

distantly positioned between 0° and 360° input. The binning out-

put codes Y_val_xx are in unsigned 13-bit format and represent

an output value of 0° (Y_val_xx = 0) and 359.96° (Y_val_xx =

8191). Any value is mapped to the bin with a lower value than the

input. The parameter lin_coeff_scalar has no meaning in binning

mode. The Y_val_xx values do not need to be in any special order.

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