HAL855 datasheet(32/102 Pages) MICRONAS

32 / 102 page

HAL8xy, HAL100x

APPLICATION NOTE

Programmer Board

Sept. 19, 2013; APN000046_03EN

Micronas

4.5.1.

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 ADC-Readout.

– Sensitivity corresponds to the increase of the output voltage with magnetic field. A

sensitivity of “1” is equivalent to a voltage increase of 5 V at an increase of 2048 of

the ADC-Readout.

The following simple formula relates the analog output voltage to the ADC-Readout

(VDD is considered to be 5.0 V):

The calibration procedure is shown in Fig. 4–7. The register values are intended as

example:

Step 1:

Programming of the parameters which do not require individual adjustment:

– Clamp Low, Clamp High, Filter Frequency, Magnetic Range, TC, and TCSQ.

Step 2:

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

voltage (VOUT,1) to that point.

Step 3:

Get the ADC-Readout value in the second calibration point and assign a nominal out-

put voltage (VOUT,2) to that point.

Step 4:

Calculate and program the values of SENSITIVITY and VOQ.

OUT

Sensitivity ADC-Readout 5 V



2048

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

Sensitivity

OUT2

OUT1

–



ADCReadout

–



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

2048

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



SENSITIVITY

Sensitivity 2048



OUT1

ADCReadout

Sensitivity

2048

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



–

VOQ

1024

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



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