A31316 datasheet(17/61 Pages) ALLEGRO

17 / 61 page

3D Magnetic Position Sensor IC

A31316

Allegro MicroSystems

955 Perimeter Road

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

www.allegromicro.com

POLARITY CORRECTION

Equation 4:

={ 2 for chan_a_pol=0

− 2 for

chan_a_pol=1

= 2 for chan_b_pol=0

− 2 for

chan_b_pol=1

{

SENSITIVITY ADJUSTMENT

Equation 5:

CA4 = CA3 × chan_a_sens

CB4 = CB3 × chan_b_sens

The range for chan_(a/b)_sens is [0 … 7.9995], with a resolution of 2-11 = 4.88e-04. The default value is 2048, resulting in a gain of 1.

SENSITIVITY CORRECTION OVER TEMPERATURE

Equation 6:

= 4×(1+chan_a_sens_tc1_cold (0−25° )+chan_a_sens_tc2_cold (0−25° )2)

×(1+

chan_a_sens_tc1_hot (0−25° )+chan_a_sens_tc2_hot (0−25° )2) Temperature<25°

Temperature≥25°

= 4×(1+chan_b_sens_tc1_cold (0−25° )+chan_b_sens_tc2_cold (0−25° )2)

×(1+

chan_b_sens_tc1_hot (0−25° )+chan_b_sens_tc2_hot (0−25° )2) Temperature<25°

Temperature≥25°

{

××××

The range for chan_x_sens_tc1_cold is [–2–7 … (2–7 – 2–17)] = –0.0078 … +0.0078 with a resolution of 2–17 = 7.63e–06[1/K]

The range for chan_x_sens_tc1_hot is [–2–8 … (2–8 – 2–18)] = –0.0039 … +0.0039 with a resolution of 2–18 = 3.81e–06[1/K]

The range for chan_x_sens_tc2_cold is [–2–14 … (2–14 – 2–23)] = –6.10e–05… +6.09e–05 with a resolution of 2–23 = 1.19e–07[1/K2]

The range for chan_x_sens_tc2_hot is [–2–16 … (2–16 – 2–25)] = –1.53e–05… +1.52e–05 with a resolution of 2–25 = 2.98e–08[1/K2]

CUSTOMER OFFSET CORRECTION

Equation 7:

CA6 = CA5 + chan_a_offs

CB6 = CB5 + chan_b_offs

The range for chan_b_offs is –32768 … +32764 with a resolution of 4 LSB.

CUSTOMER OFFSET CORRECTION OVER TEMPERATURE

Equation 8:

= 6+chan_a_offs_tc1_cold×(0−25° )

chan_a_offs_tc1_hot ×(0−25° ) Temperature<25°

Temperature≥25°

= 6+chan_b_offs_tc1_cold×(0−25° )

chan_b_offs_tc1_hot ×(0−25° ) Temperature<25°

Temperature≥25°

{

The range for chan_x_offs_tc1_cold is [–128 … +127.9375] LSB/K with a resolution of 2–4 = 0.0625 LSB/K

The range for chan_x_offs_tc1_hot is [–256 … +255.875] LSB/K with a resolution of 2–3 = 0.125 LSB/K

A31316 Datasheet(PDF) 17 Page - Allegro MicroSystems

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