HAL855 datasheet(59/102 Pages) MICRONAS

59 / 102 page

APPLICATION NOTE

HAL8xy, HAL100x

Programmer Board

Micronas

Sept. 19, 2013; APN000046_03EN

5.5.4.

The Calibration Procedure

The output characteristic is determined by four parameters:

– Clamp Low specifies the lower clamping voltage of the output curve.

– Clamp High specifies the higher clamping voltage of the output curve.

–VOQ corresponds to the output voltage at zero magnetic field.

– Sensitivity describes the magnetic sensitivity of the sensor.

The following simple formula relates the analog output voltage to the D/A-Readout

(VDD is considered to be 5.0 V):

The calibration procedure is shown in Fig. 5–7. The register values are intended as an

example:

Step 1:

Programming of the parameters which do not require individual adjustment:

– Filter Frequency, Magnetic Range, Output Mode, TC (TC, TCSQ and TC-Range)

and GP.

Step 2:

Initialize DSP

As the D/A-READOUT register value depends on the settings of SENSITIVITY,

VOQ and CLAMP LOW/HIGH, these registers have to be initialized with defined val-

ues, first:

–VOQINITIAL = 2.5 V

– SensitivityINITIAL = 0.5

– Clamp Low = 0 V

– Clamp High = 4.999 V

Step 3:

Get the DA-Readout value in the first calibration point and assign a nominal output volt-

age (VOUT,1) to that point.

Step 4:

Get the DA-Readout value in the second calibration point and assign a nominal output

voltage (VOUT,2) to that point.

Step 5:

Calculate and program the values of SENSITIVITY and VOQ.

Write and program values for Clamp High and Clamp Low

V

OUT

SENSITIVITY

16384

------------------------------------ 2

DA-Readout 5





Sensitivity

---

Vout2

Vout1

–



D/A-Readout2

D/A-Readout1

–



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



16384

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



------

Vout2

16384



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

D/A-Readout2

8192

–

 Sensitivity





–



1024

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



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