HAL855UT-K datasheet(13/42 Pages) MICRONAS

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DATA SHEET

HAL855

Micronas

Nov. 26, 2008; DSH000149_003EN

2.3. Calibration Procedure

2.3.1. General Procedure

For calibration in the system environment, the applica-

tion kit from Micronas is recommended. It contains the

hardware for the generation of the serial telegram for

programming (Programmer Board Version 5.1) and the

corresponding software (PC85x) for the input of the

For the individual calibration of each sensor in the cus-

tomer application, a two-point adjustment is recom-

mended (see Fig. 2–5 on page 14 for an example).

The calibration shall be done as follows:

Step 1: Input of the registers which need not be

adjusted individually

The magnetic circuit, the magnetic material with its

temperature characteristics, the filter frequency, the

part number and the output format are given for this

application.

Therefore, the values of the following registers should

be identical for all sensors of the customer application.

–FILTER

(according to the maximum signal frequency)

–RANGE

(according to the maximum magnetic field at the

sensor position)

– TC and TCSQ

(depends on the material of the magnet and the

other temperature dependencies of the application)

– OUTPUT FORMAT

(according to the application requirements)

– OUTPUT PERIOD

(according to the application requirements)

– PARTNUMBER

(in case Biphase-M output format is used)

– OFFSET CORRECTION

–SLEW RATE

Write the appropriate settings into the HAL855 regis-

ters.

Step 2: Initialize DSP

As the DIGITAL OUTPUT register value depends on

the settings of SLOPE, SHIFT and the OUTPUT

CHARACTERISTIC, these registers have to be initial-

ized with defined values, first:

–ShiftINITIAL = 50%

– OUTPUT CHARACTERISTIC = ’Linear Standard’

(Setpoint 0 = 0, Setpoint 1 = 16, Setpoint 2 = 32, ...,

Setpoint 31 = 496).

– SlopeINITIAL depends on the setting of the digital

low-pass filter (see Table 2–8).

Step 3: Define Calibration Points

For highest accuracy of the sensor, calibration points

near the minimum and maximum input signal are rec-

ommended.

Define nominal values DOUT1NOM and DOUT2NOM of

the DIGITAL OUTPUT register at the calibration points

1 and 2, respectively.

Note: Micronas software PC85x uses default settings

DOUT1NOM = 0 and DOUT2NOM = 3968.

The output is clamped to Setpoint 0 and

Setpoint 31. In the case of “Linear Standard’”,

Setpoint 0

corresponds

DIGITAL

OUTPUT = 0, while Setpoint 31 corresponds to

DIGITAL OUTPUT = 3968.

Table 2–8: Initial slope values

−3 dB Frequency

SlopeINITIAL

0.2578

160

0.2578

500

0.1938

1000

0.1938

2000

0.3398

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