HAL856 datasheet(14/42 Pages) MICRONAS

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HAL856

DATA SHEET

March 23, 2010; DSH000142_002EN

Micronas

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 2–9).

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 PC856 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.

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!

Table 2–9: Initial slope values

−3 dB Frequency

SlopeINITIAL

0.2578

160

0.2578

500

0.1938

1000

0.1938

2000

0.3398

Slope

INITIAL

DOUT2

NOM

DOUT1

NOM

–

()

DOUT2

DOUT1

–

()

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

Shift

100%

4096

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

DOUT2

NOM

DOUT22048

–

() Slope

Slope

INITIAL

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

–

⎝⎠

⎛⎞

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