A31316 datasheet(25/61 Pages) ALLEGRO

25 / 61 page

3D Magnetic Position Sensor IC

A31316

Allegro MicroSystems

955 Perimeter Road

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

www.allegromicro.com

NUMBER OF LINEARIZATION / BINNING POINTS

All modes have a configurable number of activated linearization/

binning points. The number of active points is selected with the

parameter coeff_active:

Table 9: Linearization / binning mode parameters used

depending on coeff_active

coeff_active

setting

Number of Active Coefficients

lin_sel 0

fixed segment

linearization

lin_sel 1

fixed segment

binning

lin_sel 2

variable segment

linearization

lin_sel 3

variable segment

binning [2]

1 [1]

21...31

1 [1]

[1]

Single coefficient settings for binning mode serve no practical purpose. The output will

always be equal to the set value.

[2]

In lin_sel = 3, if X_pos_00 does not define a bin at position 0°, a bin with X_pos = 0°, Y_val =

0° will be automatically assumed.

BINNING MODE HYSTERESIS

To prevent chattering around the transition threshold between

the bins, the A31316 contains internal hysteresis control in bin-

ning mode. The bin_hyst parameter will establish the hysteresis

in codes below the threshold, which the input into the binning

block must pass before changing to the lower bin. This prevents

expected noise and drift from changing the desired output bin for

the designated output range. The binning hysteresis is controlled

using the parameter bin_hyst. The default value of bin_hyst = 0

results in no hysteresis being applied.

The range for bin_hyst is [0… 11.162109375]° with a step size of

11.25° / 27 = 0.087890625°.

Output Clamps

The A31316 contains a digital clamp feature that can clamp the

digital output range of the device. These high and low clamps are

both programmable to the entire output range of the device. If the

input to the clamp block exceeds the upper clamp value, the out-

put is set to the upper clamp value. Similarly, if the input to the

clamp block is less than the lower clamp value, the output is set

to the lower clamp value. If high and low clamp value are equal,

the output will equal the clamp value. This can be practical for

testing purposes. If the low clamp value is set to a higher value

than the high clamp value, the output will equal the low clamp

number. This configuration has no practical use.

Equation 17:

A6 = max(ang_clamp_lower, min(ang_clamp_upper, A5 ) )

The range for ang_clamp_upper is [0 … 65535] LSB with a step

size of 1 LSB.

The range for ang_clamp_lower is [0 … 65535] LSB with a step

size of 1 LSB.

A31316 Datasheet(PDF) 25 Page - Allegro MicroSystems

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