HAL856 datasheet(15/42 Pages) MICRONAS

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DATA SHEET

HAL856

Micronas

March 23, 2010; DSH000142_002EN

2.3.2. Example: Calibration of an Angle Sensor

The following description explains the calibration pro-

cedure using an angle sensor with a HAL856 as an

example. The required output characteristic is shown

in Fig. 2–6.

– the angle range is from

−25° to 25°

– temperature coefficient of the magnet:

−500 ppm/K

Step 1: Input of the registers which need not be

adjusted individually

The register values for the following registers are given

for all applications:

–FILTER

Select the filter frequency: 500 Hz

–RANGE

Select the magnetic field range: 40 mT

–TC

For this magnetic material: 6

–TCSQ

For this magnetic material: 14

– OUTPUT FORMAT

Select the output format: PWM

–OUTPUT PERIOD

Select the output format: 8 ms

–PARTNUMBER

For this example: 1

– LOW CURRENT

For this example: 6 mA

– HIGH CURRENT

For this example: 14 mA

– OFFSET CORRECTION

For this example: none

–SLEW RATE

For this example: 0 (fastest)

Enter these values in the software, and use the “write

and store” command for permanently writing the val-

ues in the registers.

Step 2: Initialize DSP

–SHIFT

Select Shift: 50%

–SLOPE

Select Slope: 0.1938 (see Table 2–9 on page 14)

– OUTPUT CHARACTERISTIC

Select output characteristic: ’Linear Standard’

Step 3: Define Calibration Points

The Micronas software PC856 uses default settings

DOUT1NOM = 0 and DOUT2NOM = 3968.

DOUT1NOM corresponds to the angle position −25°,

DOUT2NOM to +25°.

Angle

HAL 856

-30

-20

-10

30 °

100

Sine

Linear

Output

Duty

Cycle

Sine

Linear

First Calibration Point

Second Calibration Point

Fig. 2–6: Example for output characteristics

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