HAL855UT-K datasheet(14/42 Pages) MICRONAS

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HAL855

DATA SHEET

Nov. 26, 2008; DSH000149_003EN

Micronas

Step 4: Calculation of Shift and Slope

Set the system to calibration point 1 and read the

DOUT1.

Now, set the system to calibration point 2, read the

With these values, the settings for Sensitivity and Shift

are calculated as:

Write the calculated values for Slope, Shift, and the

desired output characteristic into the EEPROM. The

sensor is now calibrated for the customer application.

As long as the LOCK bit is not set, the calibration pro-

cedure can be applied repeatedly.

Note: For a recalibration, the calibration procedure

has to be started at the beginning (step 1).

A new initialization is necessary, as the initial

values for SlopeINITIAL, ShiftINITIAL and output

characteristic are overwritten in step 4.

Step 5: Locking the Sensor

The last step is activating the LOCK function with the

“LOCK” command. Please note that the LOCK function

becomes effective after power-down and power-up of

the Hall IC. The sensor is now locked and does not

respond to any programming or reading commands.

Warning: This register cannot be reset!

2.3.2. Example: Calibration of an Angle Sensor

The following description explains the calibration pro-

cedure using an angle sensor with a HAL855 as an

example. The required output characteristic is shown

in Fig. 2–5.

– the angle range is from

−25° to 25°

– temperature coefficient of the magnet:

−500 ppm/K

Slope

INITIAL

DOUT2

NOM

DOUT1

NOM

–

()

DOUT2

DOUT1

–

()

---------------------------------------------------------------------------

Shift

100%

4096

--------------

DOUT2

NOM

DOUT22048

–

() Slope

Slope

INITIAL

----------------------------------------------------------------

–

⎝⎠

⎛⎞

Angle

HAL 855

-30

-20

-10

30 °

100

Sine

Linear

Output

Duty

Cycle

Sine

Linear

First Calibration Point

Second Calibration Point

Fig. 2–5: Example for output characteristics

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