A31316 datasheet(20/61 Pages) ALLEGRO

20 / 61 page

3D Magnetic Position Sensor IC

A31316

Allegro MicroSystems

955 Perimeter Road

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

www.allegromicro.com

rollover=round(28 ∙ (225°)/(360°))=160. The value for ang_sat_

rollover must be larger than 360°/ang_gain.

The behavior is summarized by the following equations:

Equation 13:

If ang_gain_sat_en = 0:

A2 = mod(A1 × ang_gain, 360)

Equation 14:

If ang_gain_sat_en = 1:

=⎩⎪⎨⎪

⎧ ang_gain× 1 for 1≤( 360°ang_gain

359.9945° for 360°ang_gain < 1≤

0° for 1>

)

(

)

ang_sat_rollover

As an example, the output function for a setting of ang_gain = 4,

ang_gain_sat_en = 1, and ang_sat_rollover = 225° is given in the

figure below:

180

270

360

180

270

360

Angle

post_gain_sat_val

Angle

Figure 9: Angle gain behavior over full rotation

with gain = 4 and output clamping enabled

As a second example, the output function for a setting of ang_

gain = 3 and ang_gain_sat_en = 0 is given below:

180

270

360

180

270

360

Angle

Figure 10: Angle gain behavior over full rotation

with gain = 3 and ang_gain_sat_en = 0

See section “Saturation Flag (SAT)” regarding the possible diag-

nostics for this block.

POST GAIN ANGLE OFFSET CORRECTION

After the Gain Block, there is an additional offset correction block

to allow full flexibility of angle programming. The user can option-

ally saturate the output of the Post Gain Angle Offset block or

allow to rollover using the EEPROM parameter ang_offs_sat_en.

Equation 15:

= mod(2+ang_post_gain_offs,360) forang_offs_sat_en=0

min(max(2+

ang_post_gain_offs,0),359.9945)forang_offs_sat_en=1

{

The range for ang_post_gain_offs is [–360 … 359.9890137] °

with a step size of 720° / 216 ≈ 0.010986328125°.

See section “Saturation Flag (SAT)” regarding the possible diag-

nostics for this block.

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