A31316 datasheet(21/61 Pages) ALLEGRO

21 / 61 page

3D Magnetic Position Sensor IC

A31316

Allegro MicroSystems

955 Perimeter Road

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

www.allegromicro.com

ANGLE SIGN (ROTATION DIRECTION)

The A31316 has a bit in EEPROM, cordic_pol designating

the polarity of the angle reading of the device, determined by

whether increasing output for clockwise or counterclockwise

rotation. Since each channel can be inverted individually in the

channel path, this setting must be combined with the channel

polarity bits to determine which direction of rotation is consid-

ered positive.

Equation 16:

= 3 for cordic_pol=0

360°− 3 for

cordic_pol=1

{

LINEARIZATION AND BINNING

The A31316 contains two different means of producing an output

based on any sensed angle waveform. These options are in the

form of a segmented linearization, and a discretized output option

called Binning mode. Each of these options allow for the use of

up to 33 fixed points to quantize the angle output, or the ability to

apply the segment endpoints at configurable sensed angle loca-

tions.

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

nostics for this block.

LINEARIZATION / BINNING MODE SELECTION

The preferred mode is selected by the EEPROM parameter lin_

mode, as shown in Table 9 and depicted in Figure 10.

Table 5: Linearization / binning mode selection

lin_mode Code

Output Transfer Function Option

Fixed Segment Linearization

Fixed Segment Binning Mode

Variable Segment Linearization Mode

Variable Segment Binning Mode

Y_val_01 ( value < 0 )

Y_val_03 ( value < 0 )

Y_val_13 ( value > 0 )

x_pos_00

x_pos_01

Y_val_01 ( value < 0 )

Y_val_00 ( value < 0 )

Y_val_01

Y_val_11

x_pos_00

x_pos_08

Y_val_00

Y_val_08

Fixed segment lineariza�on (lin_mode 0)

Fixed segment binning (lin_mode 1)

Variable segment lineariza�on (lin_mode 2)

Variable segment binning (lin_mode 3)

“X”

Figure 11: Linearization and Binning Modes

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