HAL856 datasheet(16/42 Pages) MICRONAS

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HAL856

DATA SHEET

March 23, 2010; DSH000142_002EN

Micronas

Step 4: Calculation of Shift and Slope

There are two ways to calculate the values for Shift

and Slope.

Manual Calculation:

1. Set the system to calibration point 1 (angle 1 = 25°)

2. read the register DIGITAL OUTPUT.

For our example, the result is

DIGITAL OUTPUT = DOUT1 = 3291.

3. Set the system to calibration point 2 (angle 2 =

−25°)

4. read the register DIGITAL OUTPUT again.

For our example, the result is

DIGITAL OUTPUT = DOUT2 = 985.

With these measurements and the pre-programming

of the sensor, the values for Slope and Shift are calcu-

lated as:

Write the calculated values for Slope and Shift and a

linear output characteristic ranging from 10% to 90%

output duty cycle into the EEPROM memory.

Software Calibration:

Use the menu CALIBRATE from the PC software and

enter the values for the registers which are not

adjusted individually. Set the system to calibration

point 1 (angle 1 = 25°), hit the button “Digital Output1”,

set the system to calibration point 2 (angle 2 =

−25°),

hit the button “Digital Output2”, and hit the button “Cal-

culate”. The software will then calculate the appropri-

ate Shift and Slope.

This calculation has to be done individually for each

sensor. Now, select an output characteristic from the

selection box “Output Characteristics” and then press

the button “write and store” for programming the sensor.

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!

Slope

3968

985

3291

–

()

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

0,1938

0.3335

–

Shift

100%

4096

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

3968

985

2048

–

()

0.3335

–

()

0,1938

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

–

⎝⎠

⎛⎞

52,22%

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