HAL1000UT-E 데이터 시트보기 (PDF) - Micronas

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HAL1000UT-E

Programmable Hall Switch

Micronas 

HAL 1000

ADVANCE INFORMATION

Step 2: Calculation of the Sensor Parameters

Fig. 2–9 shows the typical characteristics for a contact-

less switch. There is a mechanical range where the

sensor must be switched high and where the sensor

must be switched low.

VOUT

Sensor

switched off

Hysteresis

(here 80 %)

Sensor

switched on

Calibration points

position

Fig. 2–9: Characteristics of a position switch

Set the system to the calibration point where the sen-

sor output must be high, and press the key “Readout

BOFF”. The result is the corresponding ADC-READ-

OUT value.

Note: The magnetic south pole on the branded side

generates negative ADC-READOUT values, the north

polarity positive values.

Then, set the system to the calibration point where the

sensor output must be low, press the key “Readout

BON” and get the second ADC-READOUT value.

Now, adjust the hysteresis to the desired value. The

hysteresis is the difference between the switching

points and suppresses oscillation of the output signal.

With 100% hysteresis, the sensor will switch low and

high exactly at the calibration points. A lower value will

adjust the switching points closer together. Fig. 2–9

shows an example with 80% hysteresis.

By pressing the key “calibrate and store”, the software

will calculate the corresponding parameters for Sensi-

tivity, VOQ, Low-Level, High-Level and store these val-

ues in the EEPROM.

This calibration must be done individually for each sen-

sor.

The sensor is now calibrated for the customer applica-

tion. However, the programming can be changed again

and again if necessary.

Step 3: Locking the Sensor

The last step is activating the LOCK function with the

“lock” key. The sensor is now locked and does not

respond to any programming or reading commands.

Warning: The LOCKR register cannot be reset!

2.5. 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 BOFF”.

Set the system to the calibration point where the sen-

sor output must be low, and press “Readout BON”

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.

Warning: The LOCKR register cannot be reset!

10

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