HAL1000UT-A datasheet(10/28 Pages) MICRONAS

Part #	HAL1000UT-A

Description	Programmable Hall Switch

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Manufacturer	MICRONAS [Micronas]

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HAL1000

DATA SHEET

10

March 4, 2004; 6251-528-1DS

Micronas

2.3. General Calibration Procedure

For calibration in the system environment, the applica-

tion kit from Micronas is recommended. It contains the

hardware for the generation of the serial telegram for

programming and the corresponding software for the

input or calculating of the register values.

In this section, the programming of the sensor using

this tool is explained. Please refer to Section 5. on

page 23 for information about programming without

this tool.

For the individual calibration of each sensor in the cus-

tomer‘s application, a two-point adjustment is recom-

mended (see Fig. 2–9 for an example). When using

the application kit, the calibration can be done in three

steps:

Step 1: Input of the registers which need not be

adjusted individually

The magnetic circuit, the magnetic material with its

temperature characteristics, and the filter frequency,

are given for this application.

Therefore, the values of the following registers should

be identical for all sensors in the application.

–FILTER

(according to the maximum signal frequency)

The 500 Hz range is recommended for highest

accuracy.

–RANGE

(according to the maximum magnetic field at the

sensor position)

– TC and TCSQ

(depends on the material of the magnet and the

other temperature dependencies of the application)

Write the appropriate settings into the HAL1000 regis-

ters.

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.

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

sensor.

The sensor is now calibrated for the customer applica-

tion. However, the programming can be changed

again and again if necessary.

Fig. 2–9: Characteristics of a position switch

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!

Sensor

switched on

VOUT

position

Sensor

switched off

Calibration points

Sensor

switched on

Hysteresis

(here 80 %)

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