A31316 datasheet(13/61 Pages) ALLEGRO

13 / 61 page

3D Magnetic Position Sensor IC

A31316

Allegro MicroSystems

955 Perimeter Road

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

www.allegromicro.com

FUNCTIONAL DESCRIPTION

The A31316 contains two independent signal paths. One of those

are dedicated to alternate between the two sensing dimensions for

the angle calculation. The second signal path is a complete copy

of the time-shared signal path to provide a diagnostic check of the

sensing channels to ensure accuracy for safety-critical applica-

tions. Each channel has dedicated Polarity, Sensitivity, and Offset

correction that is available to the customer for end-of-line calibra-

tion. This allows the A31316 to be used in both rotary and linear

position applications in any mounting orientation relative to the

sensing magnet and to provide high accuracy and matching as the

device and magnetic system changes over temperature.

The A31316 features an internal CORDIC calculation of angle

from factory-selected pairs of detection axes (X, Y, and Z). The

CORDIC calculation effective accuracy is 16 bits.

Equation 1:

θ = atan2(sin(θ), cos(θ))

The output angle value is available in both SENT and PWM

options. Alternatively, the two factory-selected channels of the

X, Y, and Z channels are available to output in SENT. Along with

the magnetic data, the SENT option provides access to additional

device information such as temperature, error flag informa-

tion, and customer identification register data. End-of-line angle

calibration options are available in customer space to allow the

device to be used in a wide number of contactless sensing appli-

cations.

Typical Application Information

The A31316 has a high level of customer programmability to be

used in a number of applications for either on- or off-axis rotary

angle or linear position sensing. For on-axis rotary sensing, the

on-chip ATAN2 provides an angle output that, combined with the

configurable update rate, allows magnetic angular sensing at a

wide range of system bandwidth requirements. To help account

for errors associated with off axis mounting of the sensor, the

individual Channel A and Channel B Sensitivity and Offset cor-

rection can be used to match the amplitude of the signals input to

the ATAN2.

The A31316 can be used for slide-by applications, in which a

one-dimensional position change of a target is to be measured.

The angle output from the A31316 is related to the linear posi-

tion of the magnetic target. With the available linearization on the

A31316, stroke lengths greater than the length of the magnet can

be realized.

Temperature Output

The A31316 temperature sensor output that is used for tempera-

ture compensation within the device can be read from primary

nibbles or SCN serial message.

SENT temperature sensor output corresponds to SAEJ2716

APRIL2016, chapter E.2.2.3, with the following function repre-

sentation:

SENT Serial or Extended Nibble:

X1 = –230.875°C = 42.275 K

Y1 = 1

X2 = 280.000°C = 553.150 K

Y2 = 4088

SENT 8-Bit Data:

X1 = –229.0°C = 44.150 K

Y1 = 1

X2 = 279.000°C = 552.150 K

Y2 = 255

Table 1: Temperature Output Options

Temperature

Reporting Method

Code Range

Temperature Range

Step Size

Conversion

Read of Register

(temperature_16b)

–32,768 … 32,767

–231.0°C … 281.0°C

1/8°C

[°C]=signed16-bittemperaturecode

128 +25

SENT Serial or

Extended Nibble

1 … 4088

–230.9°C … 280.0 °C

1/8°C

[°C]=unsigned12-bittemperaturecode–2048

+25

SENT 8-BIT

Temperature Data

1 … 255

–229.0°C… 279.0 °C

2°C

[°C]=(unsigned8-bittemperaturecode–128)×2+25

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