HAL810
Step 1: Input of the registers which need not be
adjusted individually
The register values for the following registers are given
for all applications:
– 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
– Min-Duty
For our example: 5%
– Max-Duty
For our example: 95%
Enter these values in the software, and use the “write
and store” command for permanently writing the val-
ues in the registers.
Software Calibration:
DATA SHEET
Use the menu CALIBRATE from the PC software and
enter the values 95% for DC
1
and 5% for DC
2
. Set the
system to calibration point 1 (angle 1 =
−25°),
press
the key “Read ADC-Readout1”, set the system to cali-
bration point 2 (angle 2 = 25°), press the key
“Read ADC-Readout2”, and hit the button “Calculate”.
The software will then calculate the appropriate DC
OQ
and DCSensitivity.
This calculation has to be done individually for each
sensor. Now, write the calculated values with the “write
and store” command into the HAL810 for program-
ming the sensor.
Step 3: Locking the Sensor
The last step is to activate 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.
Step 2: Calculation of DC
OQ
and DCSensitivity
There are two ways to calculate the values for DC
OQ
and DCSensitivity.
Manual Calculation:
Set the system to calibration point 1 (angle 1 =
−25°)
and read the register ADC-READOUT. For our exam-
ple, the result is ADC-Readout1 =
−2500.
Next, set the system to calibration point 2
(angle 2 = 25°), and read the register ADC-READOUT
again.
For
our
example,
the
result
is
ADC-Readout2 =
+2350.
With these measurements and the targets DC
1
= 95%
and DC
2
= 5%, the values for DCSensitivity and DC
OQ
are calculated as follows
DCSensitivity =
5%
−
95%
2048
=
−0.3800
*
2350 + 2500
100%
−2500*(−0.3800)*100%
= 48.61%
2048
Warning: This register cannot be reset!
DC
OQ
= 95%
−
12
Feb. 6, 2009; DSH000034_003EN
Micronas
MICRONAS [ MICRONAS ]
