HAL855 datasheet(79/102 Pages) MICRONAS

79 / 102 page

APPLICATION NOTE

HAL8xy, HAL100x

Programmer Board

Micronas

Sept. 19, 2013; APN000046_03EN

6.5.2.

The Calibration Procedure

The output characteristic is determined by the following parameters:

– Shift corresponds to the output voltage at an ADC value of zero.

– Slope corresponds to the increase of the output signal with magnetic field. A Slope

of “1” is equivalent to an output signal increase of 100% at an increase of 2048 of the

ADC value.

The HAL855 provides no ADC-Readout register. Therefore, the ADC value cannot be

read out. Instead, a digital readout DOUT is provided. The digital readout is captured at

the end of the signal processing.

The DOUT value can be used in the calibration process provided the register settings

are programmed to known initial settings. Hence, the calibration process must start

with a initialization of all relevant registers.

The calibration procedure is shown in Fig. 6–8. 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 Format, Output Period, TC, and TCSQ.

Step 2:

Initialize the registers SLOPE and SHIFT:

– The SHIFT register should be programmed to 50%.

– As the ADC value depends on the low pass filter frequency, it is recommended to

program the SLOPE register to the values listed in Table 6–7.

Step 3:

Get the digital readout value DOUT1 in the first calibration point and assign a nominal

output voltage (VOUT,1) to that point.

Step 4:

Get the digital readout value DOUT2 in the second calibration point and assign a nomi-

nal output voltage (VOUT,2) to that point.

Table 6–7:

Initial SLOPE values

3 dB Filter Frequency

SLOPEINITIAL

0.2578

160

0.2578

500

0.1938

1000

0.1938

2000

0.3398

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