HAL1000 Datasheet, PDF (11/28 Pages) Micronas – Programmable Hall Switch

DATA SHEET
2.4. Example: Calibration of a Position Switch
The following description explains the calibration pro-
cedure using a position switch as an example.
– The mechanical switching points are given.
– temperature coefficient of the magnet: −500 ppm/K
Step 1: Input of the registers which need not be
adjusted individually
The register values for the following registers are given
for all sensors in the application:
– FILTER
Select the filter frequency: 500 Hz
– RANGE
Select the magnetic field range: 30 mT
– TC
For this magnetic material: 6
– TCSQ
For this magnetic material: 14
Enter these values in the software, and use the “write
and store” command to store these values perma-
nently in the registers.
Step 2: Calculation of the Sensor Parameters
Set the system to the calibration point where the sen-
sor output must be high, and press “Readout B_OFF”.
Set the system to the calibration point where the sen-
sor output must be low, and press “Readout B_ON”
Now, adjust the hysteresis to 80%, and press the key
“calibrate and store”.
Step 3: Locking the Sensor
The last step is activating the LOCK function with the
“LOCK” command. The sensor is now locked and does
not respond to any programming or reading com-
mands. Please note that the LOCK function becomes
effective after power-down and power-up of the Hall-
IC.
Warning: The LOCKR register cannot be reset!
HAL 1000
Micronas
March 4, 2004; 6251-528-1DS
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